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Full Length Research
A review on impact of compost on soil properties, water
use and crop productivity
Getinet Adugna
Ethiopian Institute of Agricultural Research; Werer Research Center P.O Box 2003, Addis Ababa, Ethiopia. Mobile: +251
911 39 11 24 Email: getinet03@gmail.com
Accepted 25 April 2016
The review summarizes the literature and the current knowledge on the effect of compost fertilization
on the soil plant system. Most of investigators confirmed that compost application could improve the
physical, chemical and biological characteristics, soil organic matter, and nutrient status of the soils.
All long-term compost application trials result in increased SOM concentrations. However, mature
composts increase SOM much better than fresh and immature composts due to their higher level of
stable carbon. In addition, due to its multiple positive effects on the physical, chemical and biological
soil properties, compost contributes to the stabilization and increase of crop productivity and crop
quality. Consequently, most investigators proved that compost has an equalizing effect of
annual/seasonal fluctuations regarding water, air and heat balance of soils, the availability of plant
nutrients and thus the final crop yields. Predominantly because of the slow release of nutrients and its
availability in compost-combined fertilization schemes often show good results. Thus, for sustainable
agricultural systems within small-scale farming in developing countries like Ethiopia, composting can
be a good option for developing effective plant-nutrient management strategies in many situations.
Key words: Crop productivity, matured compost, soil organic matter, plant nutrients, soil physical property, soil
chemical property, soil biological property
INTRODUCTION
Compost use is one of the most important factors, which
contribute to increased productivity and sustainable
agriculture. In addition, compost can solve the problem
faced on farmers with decreasing fertility of their soil. Due
to soil fertility problems, crops returns often decrease and
the crops are more susceptible to pest and disease
because they are in bad condition (Madeleine et al.,
2005).
Compost consists of the relatively stable decomposed
organic materials resulting from the accelerated biological
degradation of organic materials under controlled,
aerobic conditions (Paulin and Peter, 2008). Compost
fertilizer is made from plant and animals remains with the
objectives of recycling plant and animals remains for crop
production. The decomposition process converts
potentially toxic or putrescible organic matter into a
stabilized state that can improve soil for plant growth.
Composted organics has other beneficial effects,
including diverting landfills wastes to alternative uses,
removal of pathogen inocula or weed seeds and
decomposition of petroleum, herbicide or pesticide
residues, erosion control and as a nutrient source for
sustainable re- vegetation of degraded soils. Using
compost can improve the capacity to produce safe „clean
Academic Research Journal of
Agricultural Science and
Research
Vol. 4(3), pp. 93-104, March 2016
DOI: 10.14662/ARJASR2016.010
Copy©right 2016
Author(s) retain the copyright of this article
ISSN: 2360-7874
http://www.academicresearchjournals.org/ARJASR/Index.htm
94 Acad. Res. J. Agri. Sci. Res.
green‟ horticultural produce and importantly increase the
potential for large-scale organic food production (Paulin
and Peter, 2008).
The presence of organic matter in the soil is
fundamental in maintaining the soil fertility and
decreasing nutrient losses. Thus, compost is a good
organic fertilizer because it contains nutrients as well as
organic matter. Organic matter has number of important
roles to play in soils, both in their physical structure and
as a medium for biological activity. In addition, organic
matter makes its greatest contribution to soil productivity.
It provides nutrients to the soil, improves its water holding
capacity, and helps the soil to maintain good tilth and
thereby better aeration for germinating seeds and plant
root development (Edwards and Hailu, 2011).
Moreover, soil fertility is associated with mineralization
of nutrients contained in organic matter and their release
in plant- available form to the soil solution. Mineralization
is the result of normal biological cycles within the soil and
can be stimulated by the addition of appropriate quality
compost and cultivation (Paulin and Peter, 2008).
Because mineralization occurs over extended periods it
can make important contribution to plant growth and to
minimizing the impact of leaching associated with rainfall
and excess irrigation (Paulin and Peter, 2008). On the
other hand, adding artificial fertilizer alone is not sufficient
to retain a sufficient level of soil fertility. Organic matter is
needed to retain the water and nutrient. In degraded soil,
where there is little organic matter, yields response is
limited, even if artificial fertilizer are being used
(Madeleine et al., 2005). Hence, the farmers need to take
care of the organic matter content of the soil. An
integrated approach, combing application of compost with
an application of artificial fertilizer is a good strategy for
sustainable crop production (Gete et al., 2010).
In Ethiopia soil erosion and declining of fertility is a
serious problem to agricultural productivity and economic
growth (Gete et al., 2010). Average soil removal all over
the country was estimated to be about two billion tons per
year (CSA, 2001). Hence, to sustain the balance of soil
fertility and reduce soil erosion, and to ensure agricultural
productivity adoption of composting technology and
application of amenable compost is quite essential.
Therefore, the objective of this paper is to review the
significance of compost preparation and use, and its
effect on soil properties, water use and crop productivity.
Effects of Compost on Soil Properties
Soil organic matter
Organic additions to soil have long been considered
important in maintaining the quality of both natural and
managed soils, principally because of their role in
providing nutrients and through their role in influencing
soil physical properties. In farming systems, before the
widespread introduction of manufactured fertilizers
organic residues were the only means of adding many
nutrients to the soil, in particular Nitrogen. In non-
cultivated soils, it is likely that more than 95% of the
Nitrogen and Sulfur is found in the soil organic matter,
and possibly as much as 25% of the Phosphorus
(Amlinger et al., 2007).
One efficient way to increase SOM level is compost
application, produced especially from biomass wastes.
However, the essential influencing factors for SOM-
enrichment are quantity, type and degree of humification
of compost, the soil properties (soil type; clay content)
and managements. Mature composts increase SOM
much better than fresh and immature composts due to
their higher level of stable C (Bouajila and Sanaa, 2011
and Daniel and Bruno, 2012). In addition, high amount of
OM in compost increased OC in both soil and OC amount
in uncultivated soil was higher than cultivated soil
because of plant cultivation effect and increase of OM
degradation in cultivated soil (Soheil et al. 2012).
Bouajila and Sanaa (2011) reported that application of
manure and household wastes compost resulted in
significant increase of organic carbon, with the compost
treatment being the most efficient. Their result showed
that the application of 120 t/ha household wastes
compost and manure improved an organic carbon (1.74
% and 1.09 %, respectively) when compared with control
(0.69 %). Soheil et al. (2012) was investigated, applying
compost to soil increases the amount of soil OC with
increases rate of compost application (Table 2 and 4).
Mohammed et al. (2004) was also conducted an
experiment of use of composted organic wastes as
alternative to synthetic fertilizers in two different seasons
(Wet and dry) on the Tropical Island of Guam. The results
of the trial indicated that land application of organic
compost enhanced soil quality and increased soil fertility
and crop yield. As shown in Table 1, considerable
improvement in soil organic matter content was occurred
with the application of composted organic material.
There are few trials, which show no significant
differences in SOM level by the application of diverse C
sources (straw, manure, compost). However, the majority
of studies of different authors have unambiguously
proven a better humus reproduction for composted
materials (Agegnehu et al., 2014 and Amlinger et al.,
2007). According to Amlinger et al., 2007, the average
SOM demand of agriculturally used soils can be met by
applying 7 – 10 Mg (dry matter) compost ha-1. Therefore,
for a long-term increase of SOM, more than 10 Mg dry
matter compost ha-1 is required.
Adugna 95
Table 1. Showing improvement for some of the soil physical and chemical properties as they are affected by different
treatment from the first trail during the dry season (March – June, 2003)
Treatment
Bulk Density
(gm/cm 3)
Organic
Matter (%)
Moisture
Content (%)
NO3
(ppm)
P
(ppm)
K
(ppm)
Ca
(ppm)
Mg
(ppm)
0 t/a(cont)
1.18
5.36
26.01
3.28
30.09
206.83
3416.17
171.40
30 t/a
1.01
5.64
25.86
4.96
52.34
744.97
3779.88
297.59
60 t/a
0.98
6.57
28.07
5.89
61.02
1053.36
4748.70
431.20
120 t/a
0.91
9.46
32.16
16.01
76.65
1418.70
5492.18
787.92
Source: Mohammad et al. (2004)
Table 2: The effects of MWC on soil properties (Soheil et al., 2012)
Means with common letter in each column are not significantly different at p<0.05 according to Duncan
Figure 1. Soil bulk density in compost amended soils
(ratio of observed values in amended soils in
comparison to the control soils) (Brown and Cotton,
2011). Values <1 indicates reduced bulk density in
comparison to the control soils.
Effects Compost on Soil Physical Properties
Reduction of bulk density
Compost application generally influences soil structure in
a beneficial way by lowering soil density due to the
admixture of low density organic matter into the mineral
soil fraction. This positive effect has been detected in
most cases and it is typically associated with an increase
in porosity because of the interactions between organic
and inorganic fractions (Amlinger et al., 2007). Brown and
Cotton (2011) have observed that soil bulk density
followed a predictable pattern with decreased bulk
density at increasing rate of compost (Figure 1). Low bulk
96 Acad. Res. J. Agri. Sci. Res.
Figure 2. Changes in the structural stability in amended
parcels with manure and compost (Bouajila and Sanaa,
2011)
Figure 3. Water infiltration (minutes) for all
compost amended and control soils with the
same soil sries (Brown and Cotton, 2011).
density indicates increased pore space and is indicative
of improved soil tilth. In this respect, compost increases
the portion of meso- and macro-pores because of an
improved aggregation and stabilization of soil significantly
initiated by various soil organisms (Liu et al., 2007). In
addition, the organic fraction is much lighter in weight
than the mineral fraction in soils. As the result, increases
in the organic fraction decrease the total weight and bulk
density of the soil (Brown and Cotton, 2011).
Increase of aggregate stability
In general, soil structure is defined by size and spatial
distributions of particles, aggregates and pores in soils.
The volume of solid soil particles and the pore volume
influences air balance and root penetration ability. As a
general fact the more soil structure is compacted, the
more unfavorable are the soil conditions for plant growth.
By incorporation of compost into the soil, aggregate
stability increases most effectively in clayey and sandy
soils. Positive effects can be expected by well humified
(promoting micro-aggregates), as well as fresh, low-
molecular OM (promoting macro-aggregates). Macro-
aggregates are mainly stabilized by fungal hyphen, fine
roots, root hair and microorganisms with a high portion of
easily degradable polysaccharides (Amlinger et al.,
2007). Besides clay minerals and oxides, fine roots,
hyphen networks as well as glue-like polysaccharides
originated from root and microbial exudates significantly
contribute to the formation of micro-aggregates.
Besides, the compost quantity, the type of compost
(fresh or mature compost), the intervals of application
and above all the soils on which compost will be applied
influence the effect of compost. The field trial of Bouajila
and Sanaa (2011) showed that application of manure and
household wastes compost resulted in significant
increase of structural stability, with the compost treatment
being the most efficient (Figure 2). Their results also
indicated that the application of 120 t/ha household
wastes and manure improved better the structural
stability when compared with control. Such behavior
might be the result of elevated organic matter content
and important microbial activities (Amlinger et al., 2007).
Furthermore, aggregate and pore properties of soils are
associated with specific “active” surface area influencing
several storage and exchange processes in soil. The
higher the specific surface area, the more intensive
Adugna 97
Table 3: The effects of municipal waste compost (MWC) on concentrations of N, P, K and concentrations
of micronutrients / heavy metals and yield in corn (Soheil et al., 2012)
Means with common letter in each column are not significantly different at p<0.05 according to Duncan
Multiple Range Test
interactions can occur between soil fauna,
microorganisms and root hairs under optimum conditions
(e.g. sufficient humidity). As a result, a high specific
surface area can create the prerequisite for an optimal
soil formation (Amlinger et al., 2007).
Water holding capacity and infiltration
The amount of water that is available to a plant will
depend on two factors: the quantity of water that is able
to infiltrate into the soil and the quantity of water that the
soil is able to hold onto. Field capacity and available
water holding capacity are generally influenced by the
particle size, structure and content of OM. However, clay
soils, due to higher matric potential and smaller pore size
will generally hold significantly more water by weight than
sandy soils. In this respect, Brown and Cotton, (2011)
have indicated that while overall, texture is the
primary factor affecting water holding capacity,
increasing organic carbon is a significant factor for
improving soil water holding capacity. They also
confirmed that compost application had the greatest
effect on soil water holding capacity on coarser textured
soils with smaller to no change in water holding capacity
on finer textured soils. Further they have observed the
effect of compost addition on soil infiltration rate. Across
all soils, compost addition increased water infiltration rate
compared to the control (Figure 3).
Other authors (Bouajila and Sanaa, 2011) reported
similar results that organic amendments allowed better
water infiltration. Thier result showed that the application
of 120 t/ha household wastes compost and manure
improved water infiltration (549.25 and 596.46 cm,
respectively) when compared with control (332.16 cm).
Additionally, increased infiltration is another indication of
increased efficiency in water use as a higher fraction of
irrigation or rainfall is likely to enter soils with higher
infiltration rates. More rapid infiltration is associated with
reduced runoff, better aeration, and improved irrigation
efficiency (Daniel and Bruno, 2012). As with water
holding capacity, soil texture has a significant effect on
infiltration rate. However, unlike water holding capacity,
the largest improvement would be expected in fine
texture soils that tend to be poorly drained. In the study,
the largest improvements in water holding capacity were
seen in the coarse textured or sandy soils while the
largest improvements in water infiltration rate were
observed in the finer textured soils (Brown and Cotton,
2011). Similarly, composted cattle manure applied to the
soils showed a positive effect, improving infiltration and
decreasing runoff volumes by up to 20% (Ramos and
Marttinez-Casasnovas, 2006).
Furthermore, reduced erosion is mainly related to the
improved soil structure by the addition of compost, which,
in turn, is pointed out by better infiltration rate, pore
volume and enhanced stability through aggregation.
According to Amlinger et al. (2007), experimental trials
showed a clear correlation between increases of SOM,
reductions of soil density, soil loss and water run-off.
Strauss (2003) has quantified the effect of compost on
soil erosion in detail. Five years long compost application
resulted in 67% reduced soil erosion, 60% reduced run-
off, and 8% lower bulk density and 21% higher OM
content compared to control plots.
Effects on soil chemical properties
Enhancement of nutrient level
Compost contains significant amounts of valuable plant
nutrients including N, P, K, Ca, Mg and S as well as a
variety of essential trace elements (Agegnehu et al., 2014
and Madeleine et al., 2005). Thus, compost can be
defined as an organic multi nutrient fertilizer (Amlinger et
al., 2007). Its nutrient content as well as other important
chemical properties like C/N ratio, pH and electrical
conductivity (EC) depends on the used organic
feedstocks and compost processing conditions. By an
appropriate mixture of these, organic input materials,
humus and nutrient-rich compost substrates can be
produced which serving as a substitute for commercial
mineral fertilizers in agriculture (Amlinger et al., 2007).
98 Acad. Res. J. Agri. Sci. Res.
However, their diverse beneficial properties for
amelioration outreach their nutrient content.
Soheil et al. (2012) determined the effects of Municipal
Waste Compost (MWC) on soil chemical properties and
corn plant responses in pot experiment. They found that
the amount of available N, P and K and
micronutrient/heavy-metal concentrations in soil
increased as the result of waste compost application
(Table 2). The increases were significant for all
concentrations, especially for 60 t ha-1 treatment. They
also tested the concentrations of N, P, K and
micronutrient elements in the dry matter of the aerial part
of the plant (Table 3). The result showed that N, P and K
content and concentration of micronutrients in plant
increased with increase of compost concentration.
Amount of the waste compost was significantly increased
concentrations of macro and micronutrients in dry matter;
also, they had significant effects on concentrations of
heavy metals. However, the content of concentration of
cations was higher in plants exposed to 60 t ha-1 to 4 Kg
soil compost concentration than the rest concentrations
and control.
According to Soheil et al. (2012) research results, the
application of large quantities of MWC may contaminate
soils with heavy metals or other toxic elements.
Significant differences were observed between
treatments and the treatment 60 tha-1 have shown
highest effects on soil and corn properties. However, to
apply these kinds of fertilizers we should notice the
quantity and available forms of heavy metals and their
additive effects on soils and plants like corn and also we
should notice the excessive quantity of elements and
their toxicity and salinity to soils and plants yield like corn
and use favorable managements. In general, the content
of several ions in the compost is of potential nutritional
value to plants, especially when the heavy metals content
are low, but high concentrations of some ions can
potentially increase salinity soils (Soheil et al. (2012).
In another study, Brown and Cotton (2011)
suggested that compost amended soils contain
comparable concentrations of plant available nutrients
compared to conventionally fertilized soils and elevated
concentrations of macro- and micronutrients in
comparison to control soils. Gamal (2009) has also
conducted the experiment by applying 0 ton, 5 ton, and
10 ton ha-1 rates of compost and tested the nutrient
content at harvest. He observed increased N, P and K
nutrients content in all compost received plots and this
increase was higher in plots receiving 10 ton ha-1 of
compost. With respect to micronutrients, increased
uptake of Cu, Mn and Zn were reported (Amlinger et al.,
2007). Bouajila and Sanaa (2011) have also reported that
the application of increasing manure and waste
household compost concentrations (40 and 120 t/ha)
resulted in significant increase of organic nitrogen (Figure
4).
However, total nutrient content of compost is not plant-
available fully at once. This can be ascribed to the
existence and different intensity of various binding forms
within the organic matrix, which result in a partial
immobilization of nutrients (Tayebeh et al., 2010). On the
other hand, the fertilization effect will last longer due to a
slow and gradual release of plant nutrients (Seran et al.,
2010). Therefore, with compost there is a much better
protection from leaching compared to soluble mineral
fertilizers. Especially the N fertilization effect of compost
is limited due to low mineralization rates and microbial
immobilization (Tayebeh et al., 2010).
Increase of Cation Exchange Capacity (CEC)
The CEC is one of the most important indicators for
evaluating soil fertility, more specifically for nutrient
retention and thus it prevents cations from leaching into
the groundwater. Agegnehu et al. (2014); Jamal (2009)
and Mohammad et al. (2004) proved that compost
amendment resulted in an increase of CEC due to input
of stabilized OM being rich in functional groups into soil.
In Mohammad et al. (2004) study, following the first
harvest from dry season the same plots were used for
re- planting during the wet season. Data obtained from
the second trail indicated that as the compost application
rates were increased from 0 tons per acre to 120 tons per
acre the soil CEC as one of the major soil quality indexes
were also increased (Table 4) indicating a considerable
improvement in nutrient exchange capacity of the soils
treated with organic matter amendments. According to
Amlinger et al. (2007), soil organic matter contributes
about 20 – 70% to the CEC of many soils. In absolute
terms, CEC of organic matter varies from 300 to 1,400
cmolc kg-1 being much higher than CEC of any inorganic
material.
Increase of pH value, liming effect and improved
buffering capacity
Soil pH is an indicator for soil acidity or soil alkalinity and
is defined as the negative logarithm of hydrogen ions
activity in a soil suspension. It is important for crop
cultivation because many plants and soil organisms have
a preference for slight alkaline or acidic conditions and
thus it influences their vitality. In addition, pH affects
availability of nutrients in the soil. Compost application
has a liming effect due to its richness in alkaline cations
such as Ca, Mg and K, which were liberated from OM
due to mineralization (Agegnehu et al., 2014 and Daniel
and Bruno, 2012). Similarly, regular applied compost
material maintains or enhances soil pH (Jamal, 2009 and
Soheil et al., 2012). Only in some few cases, a pH
decrease was observed after compost application
Adugna 99
Figure 4. Variations in the total nitrogen
percentage in soils amended with manure and
compost (Bouajila and Sanaa, 2011)
Table 4. Showing improvement for some of the soil physical and chemical properties as they are affected by
different treatment from the 2nd trail during the wet season (August - October, 2003)
Treat
pH
OM
(%)
Db
(gr/cm3)
Ca
Mg
K
No3
P
CEC(Meq
/100g)
Mg/kg
0.0 T/A
7.9
3.4
1.03
3178.6
625.6
217.0
13.1
17.8
2.17
30 T/A
7.8
4.6
0.98
3300.6
1018.9
485.4
40.5
35.8
2.62
60T/A
7.8
5.4
1.02
3495.1
1564.6
748.5
55.5
44.6
3.24
120T/A
7.6
7.2
1.01
4312.4
2072.4
1064.7
76.7
58.4
4.16
Source: Mohammad et al. (2004)
(Mohammod et al., 2004).
Kluge (2006) also confirmed a significant increase of
the pH value even at moderate compost applications. A
mean increase of the pH value of 6.4 to 6.8 at 10 Mg d.m.
compost ha-1a-1 was appeared (Figure 5). Thus a supply
of annually 200 – 400 Kg CaO ha-1at compost
applications between 6 and 7 Mg d.m.ha-1corresponds to
preservation or maintenance liming and stabilization of
the pH value (kluge, 2006).
Effects of compost on water use
To ensure effective production of permanent sustainable
development of agriculture systems, minimizing negative
effects on environment, especially on sources of water
and soil fund is necessary. That means, among others, to
hinder soil degradation leading to nutrient losses and
organic matters losses linked with rapid reduction of
biologic productivity and soil quality. One of the causes of
such degradation is soil‟s lower ability to retain water. An
ability of soil organic matter to bind water has become an
important theme for research in the past years.
Compost does several things to benefit the soil that
synthetic fertilizer cannot do. First, it adds organic matter,
which improves the way water interacts with the soil. In
sandy soils, compost acts as sponge to help retain water
in the soil that would otherwise drain down below the
reach of plant roots, protecting the plant against drought.
In the contrary, compost helps to add porosity to the clay
soil, making it drain easier so that it does not stay
waterlogged and does not dry out into a bricklike
substance. Composts are used in agriculture to improve
soil fertility and quality because they can increase organic
matter content, especially in sandy soils, which have low
water and nutrient holding capacity (Laila, 2009). By
increasing soil organic matter content, composts can
improve soil water holding capacity (Brown and Cotton,
2011).
Mohammad et al. (2004) reported that as the compost
application rates were increased from 0 tons per acre to
120 tons per acre the soil moisture content were also
increased (Table 1) indicating a considerable
improvement in water availability. Brown and Cotton
(2011) proved that soil‟s retentive ability correlates
positively with soil organic matter content and negatively
with soil density. Their result showed that the treated soil
increased water holding capacity by about 1.57 times that
of the control soils. Zemanek (2011) also confirmed that
application of 50 t ha-1 and 100 t. ha-1 compost has a
positive effect on soil moisture retention, regardless of
possible influence of soil type, grassing and amount of
rainfalls (Figure 6). However, the results of 100 t ha-1
showed longer retention of higher values of moisture.
Noah et al. (2010) has also evaluated the effect of
compost and inorganic fertilizer on water use efficiency of
maize crop. The higher and significant difference that
was revealed in crop water demand satisfaction under
100 Acad. Res. J. Agri. Sci. Res.
Figure 5: mean variation of the pH value in different soils
after 8 – 11 years of compost application (kluge, 2006)
Figure 6. Soil moisture ratio in assessed treatments of
both plots, together with course of rainfalls in 2009 and
2010 (Zemanek, 2011)
compost and its related treatment as compared to
inorganic fertilizer treated soil indicate that compost
media contain more available water than soil treated with
inorganic fertilizer. This is because compost and its
related treatments increased the organic matter content
of the soil and this increased the soil available water-
holding capacity (Brown and Cotton, 2011).
Regarding water use efficiency, Lalia (2009) proved
that the treated sandy soil with compost led to an
increase in water or fertilizers use efficiency by growing
plants i.e. yield in kg per each cubic meter of irrigation
water used or each unit of added nutrients. Noah et al.
(2010 ) also observed that N-enriched co-compost (ECO)
improved crop water use efficiency and was 11% and 4
times higher than that for NPK + (NH4)2SO4 or soil alone.
Effects of compost soil biological properties
One of the most important effects of compost use is the
promotion of soil biology. A great variety of organisms
exists within the soil ranging from large, visible organisms
to organisms, which can only be viewed under a powerful
microscope. These organisms perform a wide range of
functions, which are major contributions to what we
consider normal and healthy soil. It might be reasonably
said that these organisms have essential roles in
determining the functioning of the soil system, but this
functioning is dependent upon a supply of available
carbon. In this context, compost has a stimulation effect
on both the microbial community in the compost
substrate as well as the soil-born micro biota of soils. As
reported by Brown and Cotton, (2011), the application of
compost has increased microbial activity in comparison to
the control soils. They observed microbial activity was
2.23 times greater in the compost amended soils as
compared to the control soils (Figure 7), because organic
matter found in compost provides food for
microorganisms.
Paul (2003) had conducted an experiment on long-term
effects of manure compost and mineral fertilizers on soil
biological activity and observed microbial activity was
enhanced in compost treated field plots. In his trial, soil
fertility was enhanced in the organic plots compared to
the conventional plots as indicated by a higher microbial
biomass, earthworm biomass and enhanced mycorrhizal
root colonization. Microbial biomass and activity
increased in the order: CONMIN < CONFYM < BIOORG
< BIODYN (Figure 8). Moreover, the functional diversity
of soil microorganisms and their efficiency to metabolize
Adugna 101
Figure 7. The ratio of soil organic carbon,
microbial activity, water holding capacity
and bulk density in compost amended
soils in comparison to control soils (control
soils taken from work row or other crops
area with the same soil series (Brown and
Cotton, 2011).
NOFERT = unfertilized control, BIODYN = bio-dynamic
(manure compost), BIOORG = bio-organic (rotted
manure), CONFYM = conventional with mineral fertilizers
plus manure, CONMIN = conventional without manure
(exclusively mineral fertilized).
Figure 8. Soil microbial biomass (mg Cmic*kg soil-1)
under three crops after practicing four farming systems
for three crop rotations (Paul, 2003)
organic carbon sources was increased in the organically
fertilized systems with highest values in the compost
manure BIODYN soils. However, two fractions of OM are
responsible for the level of microbial activity in general: (i)
Easily degradable organic compounds (labile OM pool)
may increase microbial activity and biomass temporarily
while (ii) a persistent increase of microbial biomass
depends on a constant enhancement of stable OM which
is particularly promoted by mature compost addition
(Paul, 2003).
Effects of compost on crop productivity
Due to its multiple positive effects on the physical,
chemical and biological soil properties, compost
contributes to the stabilization and increase of crop
productivity and crop quality (Tayebeh et al., 2010 and
102 Acad. Res. J. Agri. Sci. Res.
Amlinger et al., 2007). Long-term field trials proved that
compost has an equalizing effect of annual/seasonal
fluctuations regarding water, air and heat balance of
soils, the availability of plant nutrients and thus the final
crop yields (Amlinger et al., 2007). For that reason, a
higher yield safety can be expected compared to pure
mineral fertilization. Better crop results were often
obtained if during the first years higher amounts of
compost were applied every 2nd to 3rd year than by
applying compost in lower quantities of < 10 Mg (DM) ha-
1 every year (Amlinger et al., 2007). However, crop yields
after pure compost application were mostly lower when
compared to mineral fertilization (Agegnehu et al., 2014
and Amlinger et al., 2007), at least during the first years.
This can be explained by the slow release of nutrients
(especially N) during mineralization of compost.
Mohammed et al. (2004) has compared the use of
composted organic wastes as alternative to synthetic
fertilizers for enhancing crop productivity and agricultural
sustainability in two season (wet and dry). Yield results
from the dry season trail showed gradual increase in crop
yield as compost application rate was increased from 0
tons per acre (control) to 120 tons per acre of compost
application (Figure 9). Data from the second corn
harvest (fall of 2003) showed considerable yield increase
(Figure 10) as the result of increased compost application
rates on soils under treatment. However, 120 tons per
acre of composted application rate in wet season showed
decreased in yield as compared with 60 tons per acre of
compost applied. This was an indication that additional
application suppressed the grain production probably due
to lush green vegetative growth that was observed during
the growing season (Mohammed et al., 2004).
In another study, marketable yields of maize were
significantly increased by 107 and 124 % due to
application of compost at the rates of 5 and 7 ton fed-1,
respectively, over that of control treatment (Laila, 2011).
Moreover, compost increases available form of nutrients
for plant in soil and then increases root growth and
nutrient uptake by plant that results in plant stem height
and dry weight rise up (Soheil et al., 2012). Gamal (2009)
also reported that application of 5 ton ha-1 compost
increased sorghum grain yield by 45% as compared to no
compost plots, while the grain yield was higher at
composted plots (10 ton ha-1) by 19% than no compost
plots in different sites.
Compost use does not only improve the growth and
productivity of crops in terms of quantity but it could be
also proved that quality of agricultural products is
influenced in a positive way (Mehammed et al., 2012).
Gemal (2009) observed that the quality of corn crop was
improved as the result of increasing compost application
rate. Tayebeh et al. (2010) was also observed that
compost had a significant effect on seed protein and the
maximum amount of seed protein was observed in 60 Mg
compost ha-1 treatment.
On the contrary, organic manures like compost
discharge nutrients very slowly to the plants and
these nutrients are not directly absorb by the plants.
Therefore, plants are unable access required amount of
nutrients in the critical yield-forming period. Hence, an
integrated approach, combining application of compost
with an application of inorganic fertilizer is a good
strategy for increasing crop productivity. Such
combination also contributed to the improvement of
physical, chemical and biological properties and soil
organic matter and nutrient status. Seran et al. (2010)
investigated that half fold of recommended inorganic
fertilizers and compost at the rate of 4 t ha-1 could
give profitable yield and this combination could possibly
reduce the cost of production in the onion cultivation.
Similarly, application of half the recommended N and P
rate and half the recommended rate of manure and
compost as inorganic N equivalence resulted in yield
advantages of about 129% compared to the control
(Agegnehu et al., 2014). Tayebeh et al. (2010) were also
tested the effect of organic and inorganic fertilizers on
grain yield and protein banding pattern of wheat, and he
strongly suggested using combination of organic and
inorganic fertilizer to achieve highest yield without
negative effect on seed quality. It is clear from the results
of their study that 30% of the required nitrogen fertilizer
could be replaced by compost, because compost
improved the use efficiency of recommended nitrogen
fertilizer and reduced its cost. In this way, by carefully
managing N fertilization, less N may be needed while
grain wheat yields and protein may be maintained or
increased. In addition, less use of N fertilization will lead
to environmental conversation.
CONCLUSION
Intensive cultivation, misuse and excessive use of
chemical fertilizers may lead to loss of soil organic
matter, have adverse effects on the environment and can
threaten human and animal health as well as in food
safety and quality. Fertilizers are needed for high yields,
particularly in nutrient poor soils. With increasing fertilizer
prices and limited resources reserves, organic
amendments like compost and manure as a source of
nutrients and organic matter are considered an economic
and environmentally-friendly alternative. Compared to
plant residue and manure, composts release nutrients
more slowly and have longer- lasting effects. The slow
decomposition is more effective increasing soil organic
matter content of the soil, which plays a key role in soil
fertility by retaining nutrients, maintaining soil structure
and holding water. They also have other advantages
such as disposal and recycling of municipals solid wastes
there by reducing material going into landfill.
Caution must also be exercised in generalizing on the
Adugna 103
Treatment - Compost Application
Figure 9.Yield results from the dry season trial (spring harvest)
showing gradual increase as compost application rates were
increased from 0 to 120 tons per acre (Mohammad et al., 2004).
Treatment - Compost Application
Figure 10. Yield results from the wet season trial (fall harvest)
showing gradual increase as compost application rates were
increased from 0 to 120 tons per acre (Mohammad et al.,
2004).
effects of composts on soil health, fertility and crop
nutrition due to the variable nature of composts, and their
interactions with climatic, edaphic and crop properties.
While the general effects of compost application on soils,
have been well documented such as increasing soil
structural stability, improving water holding capacity and
plant water availability, decreasing leaching of nutrients
and reducing erosion and evaporation. However, the
effect of composts on soils is likely to be strongly
dependent on compost composition, which depends on
feedstocks, composting conditions and duration. In
addition, some studies have indicated that the effects of
compost application on soil and plant nutrients may be
modulated by soil type. Hence, the interactions between
compost type, soil properties, tillage and rotation are
needed to be well characterized.
Furthermore, organic manures like compost
discharge nutrients very slowly to the plants and
these nutrients are not directly absorb by the plants.
Therefore, plants are unable access required amount of
nutrients in the critical yield-forming period. Hence, an
integrated approach, combining application of compost
with an application of inorganic fertilizer is a good
strategy for increasing crop productivity. This will reduce
the cost of inorganic fertilizer and improve soil fertility.
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