About
23
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Introduction
I am a PhD candidate in Soil Science at The University of Adelaide. Before commencing my PhD, I worked as a lecturer at Wollega University. I also served the University in the capacity of Research and Innovation Director for the College of Agriculture and Natural Resources. My research interest focuses on the use of novel materials for acid soil management, digital soil mapping, carbon sequestration, and climate change. Research collaborations in these areas are highly welcomed.
Current institution
Additional affiliations
August 2019 - December 2020
Publications
Publications (23)
Leaf gas exchange is a key physiological trait that is highly sensitive to salinity stress. The study aimed to assess the impact of an ion signaling melatonin molecule on leaf gas exchange, K+ uptake ability and extrusion of Na+ from canola leaves. Melatonin (Mel; 1 mM) was exogenously applied as root drenching on two contrasting Brassica napus L....
The effectiveness of amendments to increase the pH of an acidic soil can be expressed as acid-neutralizing capacity (ANC). The alkalinity measurement method, based on prolonged hydrolysis of organic amendments with acid, is widely used but may overestimate the ANC of the amendments. We developed methods for determining the filtered water-extractabl...
Ameliorating soil acidity using a combination of lime and organic amendments (OAs) can be an alternative to lime alone, but determining the appropriate OA rates can be difficult. We developed a new method for calculating the combined application rate of lime and OAs (wheat straw, faba bean straw, blended poultry litter, biochar, and compost) that i...
Coffee forests are the most valuable land-use systems that provide multiple benefits such as biodiversity conservation, carbon sequestration and source of income. This study aimed to estimate the carbon stock of coffee agroforestry systems and the contribution of coffee plants (Coffea arabica L.) to carbon sequestration in the entire coffee agrofor...
Wheat (Triticum aestivum L.) is one of the most important cereal crops in Ethiopia, however the yield of the crop is low mainly due to low soil fertility management, lack of using balanced fertilizer and lack of using improved wheat varieties. The experiment was conducted to determine the effect of varieties, fertilizer rate and their interaction o...
Background
Understanding the spatial variability of soil properties is useful to tailor site-specific agricultural inputs to enhance crop production on a sustainable basis. This study was aimed to assess and map the spatial patterns of soil acidity and nutrients using geostatistical methods and support site-specific lime and fertilizer recommendati...
The main aim of this research was to assess the use of mid-infrared (MIR) spectroscopy and geostatistical model for the evaluation and mapping of the spatial variability of some selected soil properties across a field. It is with the view of aiding site-specific soil management decisions. The performance of the model for the prediction of the compo...
Classification of fields into management zones based on variability of soil fertility parameters is under use in precision agriculture. The study w as conducted in west Wollega zone of Ethiopia covering nearly 40 km2 of agricultural land, with the aim to explain variability of soils in the field, classify soils into mapping units and produce a map...
The study integrated the Revised Universal Soil Loss Equation (RUSLE) with Geographic Information System (GIS) to quantify the potential soil erosion risk in the Fincha'a watershed. Rainfall, soil, digital elevation model (DEM) and satellite image data sets were used as inputs in order to generate RUSLE factor values. The potential annual soil loss...
Soil acidity is one of the major constraints to cropping systems in the vast highlands of Ethiopia. The study investigated the status of soil acidity, map the spatial variability of acidity across agricultural soils and model lime requirement to aid their management. The pH values ranged from 4.21 to 6.57 and 26.95% of the soils in the study site w...
Soil acidity is one of the major constraints to cropping systems in the vast highlands of Ethiopia. The study investigated the status of soil acidity, map the spatial variability of acidity across agricultural soils and model lime requirement to aid their management. The pH values ranged from 4.21 to 6.57 and 26.95% of the soils in the study site w...
The study analyzed factors influencing smallholder farmland degradation and crop productivity in western Ethiopia. It was done based on survey of 120 households managing a total of 223 farm plots. The survey data was
analyzed using ordered probit model. We found that out of 15 explanatory variables investigated, slope of the farm plot, plot distanc...
Indigenous weather forecasting systems of Borana pastoralists are among the core elements of a Gada system that existed half a million years back and still serving as a powerful natural intelligence on adaptation to climatic hazards. The study was aimed to investigate the types of indigenous weather forecasting systems, mechanisms of climate inform...
Forests trap carbon dioxide from the atmosphere, store in the form of carbon (C) and regulate climate change. In this study, C storage and climate change mitigation potential of Chato Afromontane forest was assessed from measurement of the major pools including the aboveground biomass, belowground biomass, dead tree biomass, plant litter and soil o...
p>Nitrogen is the most limiting plant nutrient in Vertisols in western Ethiopia. Vertisols properties and management factors as well as fertilizer source and time of application could influence nutrient uptake by crops. With this view, a field study was conducted at Ambo Agriculture Research Centre experimental site during the main cropping season...
The study examined aggregate size distribution and related structural indices in soils of natural forest, Cupressus lusitanica plantation and cultivated land through dry and wet sieving techniques. Variations in aggregate size distribution and structural indices were observed among land uses which might be ascribed to soil organic carbon (SOC) cont...
Forest ecosystem takes the lion share of soil C store compared to other land use systems. The study was aimed to examine the influence of land use change on soil C sequestration potential under varying soil layers. Heterogeneity in soil C storage was observed across land use types and soil layers due to disparity in spatial distribution of soil C d...
The study examined the impact of deforestation and subsequent cultivation on soil fertility and acidity conditions under varying soil depths. Soil profiles were opened in two adjacent land units, namely forestland and arable land and samples were collected from genetic horizons. Deterioration of soil fertility was observed after deforestation and t...
Land suitability evaluation is a system used to allocate land for appropriate use. The study examined the physical suitability of land for surface irrigation. Suitability of different land quality parameters viz. slope, soil texture, depth, erosion, drainage, soil pH, electrical conductivity (EC), organic matter (OM), total nitrogen (N), available...
Land suitability evaluation is a system used to allocate land for appropriate use. The study examined the physical suitability of land for surface irrigation. Suitability of different land quality parameters viz. slope, soil texture, depth, erosion, drainage, soil pH, electrical conductivity (EC), organic matter (OM), total nitrogen (N), available...
The study examined the impact of deforestation and subsequent cultivation on soil fertility and acidity conditions under varying soil depths. Soil profiles were opened in two adjacent land units, namely forestland and arable land and samples were collected from genetic horizons. Deterioration of soil fertility was observed after deforestation and t...
Questions
Questions (36)
When we add organic matter in the form of biochar or compost to acidic soils, the organic materials decompose and release alkalinity such as carbonates, organic anions, inorganic anions, organic surface functional groups, and other organic compounds to the soil to neutralise acidity and raise soil pH. However, all the organic compounds generated from organic materials are not soluble in water to raise soil pH.
Which of these organic compounds or others not mentioned here, which are derived from organic materials, are soluble only in acids such as 0.5 M HCl and which of them are soluble in water as well?
I appreciate your time to answer this discussion question.
When we add organic matter in the form of biochar or compost to acidic soils, the organic materials decompose and release alkalinity such as carbonates, organic anions, inorganic anions, organic surface functional groups, and other organic compounds to the soil to neutralise acidity and raise soil pH. However, all the organic compounds generated from organic materials are not soluble in water to raise soil pH.
Which of these organic compounds or others not mentioned here, which are derived from organic materials, are soluble only in acids such as 0.5 M HCl and which of them are soluble in water as well?
I appreciate your time to answer this discussion question.
0.25 gram of soil sample is digested using 2 mL conc. HNO3 + 0.5 mL conc. H2O2 (i.e. a total of 2.5 ml of conc. acids). Then, distilled water was added to bring the solution in the digestion tube to the final volume of 20 ml. Furthermore, 1 ml of the final solution was taken and diluted in 9 ml distilled water (1 ml+9 ml) and analysed for calcium, aluminum, etc.
For example: Ca = 11.22 mg/L, Al = 42.79 mg/L
How to convert these values to mg/kg?
Thanks in advance.
I read many papers on the use of titration methods for determining lime rate. But there is no consistency on which soil: water ratio or soil to 0.01 M CaCl2 ratio is reliable for determining lime requirement. Some studies used 1:1 or 1:2 soil to water and soil to CaCl2 solution ratio (e.g. 20 g soil into 20 mL of 0.01 M CaCl2 solution). Other studies used 1:5 soil to water or 1:5 soil to CaCl2ratio (e.g. 4 g soil into 20 mL of 0.01 M CaCl2 solution).
Which soil to liquid ratio is recommended for lime estimation?
Thank you for your contribution.
Dear all,
I read a lot of papers on the topic. But there is no consistency on which soil: water ratio or soil to 0.01 M CaCl2 ratio is reliable for determining lime requirement. Some studies used 1:1 or 1:2 soil to water and soil to CaCl2 solution ratio (e.g. 20 g soil into 20 mL of 0.01 M CaCl2 solution). Other studies used 1:5 soil to water or 1:5 soil to CaCl2ratio (e.g. 4 g soil into 20 mL of 0.01 M CaCl2 solution).
Which soil to liquid ratio is recommended for lime estimation?
Thank you for your contribution.
I read many articles on the use of the handheld GreenSeeker to measure the greenness of crop canopy cover and N uptake under field conditions. But I couldn't catch articles that deal with the same issue for pot experiments.
Can I use GreenSeeker for measuring the NDVI of crops grown in pots under greenhouse conditions?
I read many articles on the use of the handheld GreenSeeker to measure the greenness of crop canopy cover and N uptake under field conditions. But I couldn't catch articles that deal with the same issue for pot experiments.
Can I use GreenSeeker for measuring the NDVI of crops grown in pots under greenhouse conditions?
