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Chickpea and Wild mustard as Influenced by Intercropping in Different Row Proportions


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A field experiment was conducted at Grdarasha Experimental Farm / College of Agricultural Engineering Sciences / Salahaddin University-Erbil, located at (36.2 o N, 44.1 o E and elevation 470 m) during the winter season of (2016-2017) to study the performance of wheat (Triticum aestivum L.), chickpea (Cicer arietinum L.) and wild mustard (Sinapis arvensis L.) in intercropping. Seven treatments were initialized from combination of either single, double or triple (row: species) were arranged in a standard replacement series. Aiming to study growth, yield and yield component of wheat (A), chickpea (B) in the presence of the invading wild mustard weed (C), which is the common invader weed in the area. Wheat species possessed the highest significant mean values of plant height (123.0 cm), spike length (13.9 cm), grain yield (182.0 g plant-1), straw yield (752.5 g plant-1), while wild mustard showed superiority in all studied traits except in silique length and grain number. silique-1 .
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ZANCO Journal of Pure and Applied Sciences
The official scientific journal of Salahaddin University-Erbil
ISSN (print ):2218-0230, ISSN (online): 2412-3986, DOI:
Growth, Yield and Yield Components of Wheat (Triticum aestivum L.),
Chickpea and Wild mustard as Influenced by Intercropping in Different Row
Aryan S. A. Dizayee1*, Sami Mohammad Amin Maaroof 2
1&2Department of Field Crops, College of Agricultural Engineering Sciences, Salahaddin University-Erbil, Kurdistan Region, Iraq
A B S T R A C T:
A field experiment was conducted at Grdarasha Experimental Farm / College of Agricultural Engineering Sciences /
Salahaddin University Erbil, located at (36.2o N, 44.1o E and elevation 470 m) during the winter season of (2016-2017) to study
the performance of wheat (Triticum aestivum L.), chickpea (Cicer arietinum L.) and wild mustard (Sinapis arvensis L.) in
intercropping. Seven treatments were initialized from combination of either single, double or triple (row: species) were arranged
in a standard replacement series. Aiming to study growth, yield and yield component of wheat (A), chickpea (B) in the presence of
the invading wild mustard weed (C), which is the common invader weed in the area. Wheat species possessed the highest
significant mean values of plant height (123.0 cm), spike length (13.9 cm), grain yield (182.0 g plant-1), straw yield (752.5 g plant-
1), while wild mustard showed superiority in all studied traits except in silique length and grain number. silique-1.
Intercropping, Growth, Yield Components, Relative yield, Row: Species Ratio.
ZJPAS (2020) , 32(1);115-126 .
In the developing countries at tropic and
sub tropic regions, lands are often utilized by a
special method called intercropping where as two
or more crops are grown simultaneously on the
tract (Shaker and Nasrollahzadeh, 2014). Bybee-
Finley and Ryan (2018) confirmed the legacy of
traditional practice of the intercropping pattern
throughout the history to increase yield then to
insure optimal instinctive use of land in
sustainable agriculture. Wheat (Triticum aestivum
L.) is one of the most important crops in terms of
cultivated area and productivity, due to the
excellent control over weed invasion (Siyahpoosh
et al., 2012).
The mineral nutrition significantly
contributed in increasing crop yields during the
20th century. (Khursheed and Mahammad, 2015).
Chickpea (Cicer arietinum L.) is important pulses
food, which is traditionally grown under rain-fed
environmental conditions in most parts in the
world and it is belong to the family Leguminaceae
(Erdemci, 2018). Cicer arietinum L. is the main
crops that have a role in fixed nitrogen in the
nodules of the root, through its role in soil fertility
(Qader, 2019). Wild mustard (Sinapsis arvensis
L.) is an annual winter plant which belongs to
Brassicacea or Crusiferea plant family it has
indeterminate upright growth and may reach a
height of more than two and a half meter. This
weed proliferates extreme spreading through
producing thousands of seeds, which are assisted
by the valuable tropical and subtropical weather
(Siyahpoosh et al., 2012). Weed-crop competition
studies possessed many scenarios or experimental
designs. Any one of them has a critical importance
* Corresponding Author:
Aryan Suad Ahmad Dizayee
Article History:
Received: 01/07/2019
Accepted: 02/10/2019
Published: 25/02 /2020
Dizayee. A. and Maaroof.S/ZJPAS: 2020, 32 (1): 115-126
ZANCO Journal of Pure and Applied Sciences 2020
(Rejmanek et al., 1989). Harper (1977), noted that
the replacement design is an effective way
particularity in the study of the interference
between two species of plant crops. However,
additive design is widely used to study the
competition between the weeds and crops (Aziz,
1991; Wilcox, 1995; Ali, 2000; Bhan and Froud,
2005). In replacement series total plant density is
kept fixed within a special care to plant geometry.
Total density of all the crops involved in the
design was constant. In other word, when the
density of one crop components increases or
decreases, the density of the other crops changes
to maintain a constant total for all partial crop
densities seeking for optimizing yield levels
(Kaushik et al., 2016). Sharma et al., (1986) in the
other hand detected significant effects of plant
density on intercropped plants of wheat and
mustard. Intercropping of wheat and mustard
according to (Singh and Pal, 1994) reduces their
seed yield comparing to their pure stands. Yield
and yield components of wheat were significantly
affected by intercropping of chickpea, lentil and
rapeseed (Malik et al., 1998). Intercropping can
increase the productivity of both yield and grain
quality by integrating the use of water, fertilizer,
space, and other resources (Thorsted et al., 2006;
Lithourgidis et al., 2011). Selection of suitable
cultivars and sowing time plays an important role
in obtaining higher yields due to good utilizing of
residual soil moisture and nutrients from the soil
(Mandal et al., 1996; Sekhar et al., 2015; Kaushik
et al., 2016). Cultivation of chickpea with cereal
crops (barley, wheat, etc.) or oilseed (mustard,
linseed, etc.) is well known to farmers of non-
insured rain fed areas (Poddar et al., 2017). The
importance of intercropping is the possibility of
increasing the quantity and improving the quality
not only by increasing production costs; but also
by modifying farm management (Willey, 1979).
Intercropping facilitates different resources of
returns to the farmer from the same land, and
reduces crop failure risk of a mono-cropping when
susceptible to ecological and economical
fluctuations. This approach was backed by (Khan
et al., 2005). The objective of this study was to
evaluate the effect of intercropping and row ratios
on some growth parameters and yield components
of wheat, chickpea and wild mustard.
The experiment was carried out at
Grdarasha Research Farm, College of Agricultural
Engineering Sciences / Salahaddin University / in
Erbil-Iraq (36.2º N, 44.1º E and elevation 470 m
above the mean sea level). In single, double, and
triple (row: species) arrangements were used in a
standard replacement series to maintain a total
number of 6 rows, which forms seven (row: ratio)
consortia. Each group represents one
intercropping mixture treatment. Combinations
were repeated 3 times to form sixty three units of
2 m rows length and 0.2 m inter-row spacing
forming an area of 4.8 m2. Each treatment was
duplicated to avoid any probable risk. The
experiment was planned based on the Randomized
Complete Block Design (RCBD). Wheat (A),
chickpea (B) and wild mustard (C) were sown
solely or in 1, 2, 3 rows out of 6 rows per each
treatment. They form triple (row: crop) ratios
named 1A:2B:3C, 1A:3B:2C, 2A:1B:3C,
2A:2B:2C, 2A:3B:1C, 3A:1B:2C and 3A:2B:1C,
respectively plus three sole crops as control
treatments. Data are represented by error bars with
standard error labeled by (Duncan, 1975) letters
for 5% significance. Samples were taken from air
dried soil in the field at a depth (0 - 30 cm), and
then analyzed for some physical and chemical
properties as shown in (Table 1). The recorded
rainfall during the growing period from (Nov.
2016 to May. 2017) was 218 mm. The seeds were
sown in rows on November 26th 2016. Manual
weed control repeated twice. Planting densities
were chose based on the recommendations of the
competent local agricultural authorities. However,
wild mustard density was adopted according to its
natural abundance in the region as 175, 63 and 38
plants/m2 for wheat, chickpea and wild mustard
respectively. Seeds of the competitor plant species
were obtained from the Directorate of Agricultural
Research Station, Erbil.
Dizayee. A. and Maaroof.S/ZJPAS: 2020, 32 (1): 115-126
3.1. Days to Flowering
The results of analysis of variance in
figure (1) showed that chickpea plant had
significant response to number of days to
flowering. The highest number was recorded in
the mix-consortium 2:3:1 (134.7 days), while
1:2:3 row consortia recorded lowest number of
days (129.3). In addition wheat and mustard didn’t
obtain any significant differences among all
Figure 1: Effect of intercropped species on number of days to flowering.
3.2. Plant Height (cm)
Plant height is an important growth
parameter that is affected by genetic and
environmental variation. The result in figure (2)
indicates the existence of significant differences
among all studied factors. The greater plant height
(123.0 cm) was showed in the treatments where
chickpea and wild mustard was intercropped in
1:2:3 ratios. The wheat recorded minimum plant
height of (110.2 cm) at pure stands. Chickpea
possessed (77.7 cm) taller plant at 3:1:2 ratio, in
addition wild mustard (130.2 cm) the highest
mean when planted at 2:3:1 row species consortia.
This result is in agreement with the findings of
Mandal (1991), who noticed intercropping legume
crops significantly increased wheat plant height.
Dizayee. A. and Maaroof.S/ZJPAS: 2020, 32 (1): 115-126
ZANCO Journal of Pure and Applied Sciences 2020
Figure 2: Effect of intercropped species on plant height (cm).
3.3. Number of tillers or branches plant -1
Number of wheat tillers and mustard
branches responded significantly to mix-culture as
they produced (3.3 tillers. plant-1) tiller for wheat
and (17.7 branches. plant-1) for mustard at
consortia 1:2:3, 1:3:2 and 2:3:1 respectively
superior to their pure stands, in addition chickpea
obtained the highest mean value (6.0 branches.
plant-1) in pure stand, while the lowest value (3.7
branch. plant-1) in mix-consortia 132 ratio (Figure
3). Lemerle et al., (2001), note that the number of
tillers is the most important yield component in
wheat, which reduced with increase competition
of weeds. Armin et al. (2011) has reported that in
condition of competition for nutrients, water and
light availability, it will restrict the plant growth
and reducing number of tiller per plant. Similar
results also found by (Marof, 2008; Marof, 2013).
Figure 3: Effect of intercropped species on number of tiller or branch.plant-1.
Dizayee. A. and Maaroof.S/ZJPAS: 2020, 32 (1): 115-126
3.4. Spike or Pod Length (cm)
Statistical analysis of the data figure (4)
revealed that chickpea shows non-significant
affects in length of reproductive organs pods.
However wheat plant recorded longest mean
values of (13.9 cm) was possessed in the treatment
where wheat was intercropped with chickpea and
wild mustard in 1:3:2 ratio, while the smallest was
(12.3 cm) planted at 1:2:3 mix consortia. Mustard
recorded the longest silique length in the treatment
3:1:2 (2.7 cm), whereas the smallest mean was
(2.3 cm) in the treatment 2:1:3 row ratio. Karim
and Mamun (1988) reported that competition
leads to reduced length of leaves which eventually
caused the process of photosynthesis that provided
less absorption than required to produce natural
spike. These results are in agreement with the
findings reported by (Nazir et al., 1988; Malik et
al., 2002; Sinha et al., 2009).
Figure 4: Effect of intercropped species on spike or pod length (cm).
3.5. Grain Number per Spike or Pod
All three competitor plant species in all
mix and pure stands showed significant variation
number of grain per spike or per pod and silique.
The most number of grain was obtained of wheat
plant (63.7) at 1:3:2, while the lower mean value
was (52.3) in mix-consortia 3:1:2. Chickpea and
wild mustard possessed the higher mean value
(48.0 and 16.0) in the treatment 1:2:3 and 3:2:1
row ratio, followed by the lower mean was (37.0
and 12.3) in the mix-consortia 3:1:2 and 2:3:1
ratio (Figure 5).
Dizayee. A. and Maaroof.S/ZJPAS: 2020, 32 (1): 115-126
ZANCO Journal of Pure and Applied Sciences 2020
Figure 5: Effect of intercropped species on grain number per spike or pod.
3.6. Days to Maturity
The data Postulated in figure (6) confirm
non-significant differences P ≥ 0.05 in the time
period required to maturity in general. The highest
number was (172.7) showed of wheat at 2:1:3
ratio, followed by mustard weed by (142.7) in
2:2:2 mix- consortium compared with pure stands.
The decrease in the length of the plant cycle under
rain conditions is one of the main effects of water
deficits. (Thompson and Chase 1992), these
results are also supported by (Naeem Khan et al.,
2002; Hassani et al., 2006).
Figure 6: Effect of intercropped species on number of days to maturity.
Dizayee. A. and Maaroof.S/ZJPAS: 2020, 32 (1): 115-126
3.7. Grain Yield (g). m-2
Grain yield displayed in figure (7) shows a
wide variation, the highest mean values was
(182.0 g. m-2) in the mix consortia 1:2:3, whereas
the lowest were at (78.2 g. m-2) in the pure stands
of wheat plants. The highest chickpea were (82.4
g. m-2) when intercropped with wheat and mustard
at 2:2:2 ratio, but the lowest value was (54.6 g. m-
2) in the 3:1:2 row consortia. Wild mustard at pure
stand recorded (54.9 g. m-2) which was the highest
mean value, while 3:1:2 row consortium recorded
lowest value (28.9 g. m-2). There has been a
decline in grain yield due to the physiological and
morphological characteristics of wheat and weeds
that have led to a similar convergence towards the
use of natural resources towards final
photosynthesis (Sinha et al., 2009).
Figure 7: Effect of intercropped species on grain yield (g). m-2.
3.8. Straw Yield (g). m-2
Figure (8) revealed that straw yield
recorded highest significant mean value of wheat
in the mix stand 1:2:3 was (752.5 g. m-2), whereas
the lowest value was (385.7 g. m-2) in the pure
stand. Wild mustard cultivated produced higher
straw yield (211.9 g. m-2) in the pure stand
over all mix-consortia. However chickpea plants
showed non-significant effected on mean straw
yield over all studied treatments. Hossain et al.
(2010), suggested that straw yield decreases with
increased competition for weeds, because the
plant cannot take more light for photosynthesis
and tillage production, while disagree results were
noted by (Marof, 2008).
Dizayee. A. and Maaroof.S/ZJPAS: 2020, 32 (1): 115-126
ZANCO Journal of Pure and Applied Sciences 2020
Figure 8: Effect of intercropped species on straw yield (g). m-2.
3.9. Biological Yield (g). m-2
Biological yield is correlated with plant
height and number of tillers. The data presented in
figure (9) shows that chickpea and wild mustard
possessed the highest mean value (233.1 and
266.7 g. m-2) in 2:2:2 mix and pure stand
respectively. In addition 3:1:2 row mix-consortia
recorded the lowest value which was (155.5 and
171.8 g. m-2) respectively. Additionally wheat
plant didn’t possess any significant differences
over all mix and pure stands in this trait.
Figure 9: Effect of intercropped species on biological yield (g). m-2.
Dizayee. A. and Maaroof.S/ZJPAS: 2020, 32 (1): 115-126
3.10. Harvest Index
The results of harvest index displayed in
figure (10) the higher mean value of cultivated
chickpea was (0.38) in pure-stand, whereas the
lowest was recorded at 2:3:1 which was (0.33).
The maximum was for mustard provided (0.20) in
mix consortia 1:2:3 and pure stand respectively.
However, wheat plant showed no significant
differences among all studied treatments.
Figure 10: Effect of intercropped species on harvest index.
3.11. Relative Yield and Relative Yield Total
The data presented in figure (11) turns out
that partial relative yield of chickpea and mustard
plant scored highest significant mean value 1.102
in mix consortium 2:2:2 and 0.979 in 1:2:3 mix
consortia over pure stands, while wheat plant
didn’t scored any significant effects. Total relative
yield scored higher mean value 1.414 in mix
consortia 1:2:3 and lower mean value 1.098 in
2:3:1 mix consortium.
Dizayee. A. and Maaroof.S/ZJPAS: 2020, 32 (1): 115-126
ZANCO Journal of Pure and Applied Sciences 2020
Figure 11: Effect of intercropped species on relative yield and relative yield total.
Table (2): The analysis of variance (ANOVA) for the effect of intercropped species on growth, yield and yield
Source DF
Sum of Squares
Mean Square
Days to flowering
Plant height (cm)
N. of tiller. plant-1
Spike length (cm)
Grain number. spike-1
Days to maturity
Grain yield g. m-2
Straw yield g. m-2
Biological yield g. m-2
Harvest index
Days to flowering
Plant height (cm)
N. of branch. plant-1
Pod length (cm)
Grain number. pod-1
Days to maturity
Grain yield g. m-2
Straw yield g. m-2
Dizayee. A. and Maaroof.S/ZJPAS: 2020, 32 (1): 115-126
Biological yield g. m-2
Harvest index
Days to flowering
Plant height (cm)
N. of branch. plant-1
Silique length (cm)
Grain number. silique-1
Days to maturity
Grain yield g. m-2
Straw yield g. m-2
Biological yield g. m-2
Harvest index
Significant occurs when P ≤ 0.05
Intercropping could reduce the yield of
mustard to about 30% compared to the yield in its
sole cropping. Wheat and chickpea did not show
any reciprocal significant harm effects on each
I heartily thank Field Crops Department,
Agricultural Engineering Sciences College, and
Salahaddin University - Erbil for their help
towards successful completion of the work.
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Sustainable intensification calls for agroecological and adaptive management of the agrifood system. Here, we focus on intercropping and how this agroecological practice can be used to increase the sustainability of crop production. Strip, mixed, and relay intercropping can be used to increase crop yields through resource partitioning and facilitation. In addition to achieving greater productivity, diversifying cropping systems through the use of strategic intercrops can increase yield stability, reduce pests, and improve soil health. Several intercropping systems are already implemented in industrialized agricultural landscapes, including mixed intercropping with perennial grasses and legumes as forage and relay intercropping with winter wheat and red clover. Because intercropping can provide numerous benefits, researchers should be clear about their objectives and use appropriate methods so as to not draw spurious conclusions when studying intercrops. In order to advance the practice, experiments that test the effects of intercropping should use standardized methodology, and researchers should report a set of common criteria to facilitate cross-study comparisons. Intercropping with two or more crops appears to be less common with annuals than perennials, which is likely due to differences in the mechanisms responsible for complementarity. One area where intercropping with annuals in industrialized agricultural landscapes has advanced is with cover crops, where private, public, and governmental organizations have harmonized efforts to increase the adoption of cover crop mixtures.
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Genotype by environment (GE) interaction is considered to be among the major factors limiting the efficiency of breeding programs. Fifteen chickpea genotypes were evaluated to study their adaptability and stability in eight environments of South East of Turkey. The experiment was carried out in randomized complete block design with three replications in two locations in over three years. In this study, AMMI and GGE biplot analyses were used in the evaluation of test environments and genotypes. The AMMI analysis showed that the effects of genotype, environment and genotype × environment interaction were significant (P<0.01) on grain yield. The results of AMMI analyses indicated that chickpea grain yield performances were highly affected by environmental effect followed by the magnitude of GEI and genotype contributed the least effect. The polygon view of the GGE biplot showed that environments used this study belonged to two mega-environments, with different winning genotypes G2 (FLIP03-128C) and G12 (FLIP09-51C). The GGE biplot also revealed that E6 (2015 Diyarbakır winter sowing) was the most discriminating environment for grain yield of chickpea genotypes. According to the AMMI, GGE biplot and linier regression models, considering simultaneous average yield and stability, G1 (EN 934) and G10 (FLIP 03-110C) genotypes were the best genotype all the environments. However, G2 (FLIP03-128C), G3 (FLIP03-28C) and G5 (X03TH130) genotypes can be regarded as adapted to a wide range of environments.
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A study was undertaken for using Umbelliferous spices, coriander, fenugreek and fennel as intercrop with chickpea in 2:1, 3:1 and 4:2 row ratios, each separately with their respective sole treatments during the winter season 2010–2011, to determine the effect of different intercropping systems on productivity and competitive functions. The yield of chickpea increased progressively with the increase in number of rows of chickpea in every intercropping system. All the intercropping systems produced higher land equivalent ratio (LER) than their respective sole cropping. Chickpea and fennel (4:2 row ratio) recorded higher benefit in terms of monetary advantage index (MAI) (Rs. 6990 ha⁻¹), income equivalent ratio (IER) (2.03), system productivity index (SPI) or intercropping advantages (IA) among the all the intercropping systems. All the three spices performed as a dominant component, while chickpea was suppressed, and higher competition was noticed when coriander was taken as an intercrop, while competition was less in chickpea and fennel intercropping system.
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An experiment was conducted to study the effects of three different nitrogen fertilizers (Ammonium sulfate AS), diammonium phosphate DAP and urea), two wheat species and their interaction on plant height, number of tillers, flag leaf area, shoot dry weight, leaf chlorophylls, number of spikes plant-1 , thousand seed weight, grain yield, nitrogen and grain protein content. N fertilizers significantly increased all tested parameters of growth, DAP followed by AS were a more efficient N source than urea. Effect of species was significant on all mentioned traits except chlorophyll b, number of spikes plant-1 , nitrogen and grain protein content. The interaction between both studied factors brought about significant increases in all mentioned traits except number of spikes plant-1 .
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In order to study the effect of plant density and nitrogen rate on yield and yield components of wheat in wild oat-infested condition an experiment was conducted in 2009 in southern. The treatments were consisted of 4 levels of nitrogen (0, 100, 150 and 200 kg ha) and three crop densities (250, 400 and 550 plants per m 2) which arranged in factorial using RCD with four replications. Wild oat densities in weed-infested plots was similar and (about 80 plants per m 2). The results showed that wild oat height in all three densities treatments was lower than wheat in early growth stage but in late growth was higher than wheat. Increasing wheat density by 550 plants per m 2 increased wheat grain yield, biological yield and number of ears. The highest harvest index, tiller number, grain number per ear, ear length and seed weight were obtained in density of 250 plants per m 2. The highest grain yield, biological yield, harvest index, tiller number, ear number, grain number per ear, ear length and seed weight was observed in the highest levels of nitrogen. In conclusion the results showed that by increasing wheat density and rate of nitrogen application wheat competitiveness increased against wild oat.
Substitutive (replacement) and partial additive experimental designs, with their underlying models, remain the two most popular techniques in weed-crop competition studies, despite considerable criticism of these approaches in the recent literature. We review standard designs for two-species competition experiments and demonstrate the advantages of a reciprocal yield model applied to data from an additive series experiment, using mixtures of Japanese millet and tomato. A traditional replacement series analysis failed to provide a general model of competition among these two species over several total plant densities, while an application of a reciprocal yield (inverse linear) model to the same data was successful. This technique allows evaluation of the influences of both weed on crop and crop on weed, as well as the partitioning of net competition effects into intra- and interspecific components. One Japanese millet plant was competitively equivalent to 3.7 tomato plants, as measured by effects on tomato biomass, while one tomato plant was equivalent to 0.14 Japanese millet plants, as measured by effects on millet biomass. Skewness of per plant biomass distribution is shown to be a result but not an unambiguous measure of competition. Expansion of a reciprocal yield model to mixtures of more than two species is illustrated using three species of duckweed. While some caution is recommended, the reciprocal yield analysis applied to data from appropriately designed experiments is a substantial improvement over more traditional methods.
For control of wild mustard weed competition through the use of compressibility wheat cultivars tested over 2007-2009 years in the field of agricultural research, Agriculture and Natural Resources Ramin, a factorial design was randomized complete block with 4 replications. Experimental factors included two wheat cultivars (Chamran and Kavir), three sowing wheat (300, 400, 500 plants per square meter) and wild mustard weed densities (0, 8, 16, 32 plants m), respectively. Results of study showed that due to higher length of Kavir cultivar at presence of wild mustard could increase 4.5 % biological yield, 11.5% grain yield, higher harvest index, higher number of spikelet's in each spikes compare to Chamran. Increase in wheat density resulted in higher grain yield around 9% but it decreased on weed biomass and spike length. Increase in wheat density up to 16 plants in each square meter decreased wheat total grain yield around 18% while increase plant density to 32 plants in each square meter led to increase in species competition and so wheat yield increased but this was not significantly significant.
A 2-year experiment on 8 wheat (Triticum aestivum L. emend. Fiori & Paol.) - chickpea (Cicer arietinum L.)-based intercropping systems resulted in the highest yield advantage at 4 : 2 sowing ratio of wheat and chickpea. However, sole crops of wheat and chickpea resulted in the highest grain or seed yields. Wheat equivalence, gross return, net return (Rs/ha), net return (Rs/ha/day), net return/rupee invested, land-equivalent ratio, monetary advantage, relative net return, area-time equivalent ratio, relative value total were recorded highest at 4 : 2 sowing ratio of wheat and chickpea.