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Physical Effectiveness of Soil and Water Conservation Technologies in Drought Prone Areas of Western and Central Uganda

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Journal of Agricultural Science and Technology(B) 2015年第8期5卷 523-529页

作者： everline komutunga Wilberforce Tushemereirwe Jerome Kubiriba Priver Namanya Kevin John Oramngye David Akodi Choice Agaba Elizabeth Ahumuza and Daphine Kamusingize National Agricultural Research Laboratories-Kawanda P.O. Box 7065 Kampala Uganda

The effect of soil and water conservation （SWC） practices on controlling surface runoff and soil loss was studied in drought prone banana growing areas of Uganda, during the two major rainy seasons of 2014. The study was conducted at two sites-- Ntungamo （Southwest） and Sembabule （Central）, with comparable slopes of about 13%-25%. The treatments included mulch, manure, manure ＋ mulch and a control with no conservation. Results indicated that conservation practices of mulch and manure ＋ mulch significantly reduced surface runoff and soil loss by about 72%-85%, when compared to farmers＇ up-and-down cultivation practice （control）. It was also observed that significantly greater amounts of soil loss occurred from manure and control plots than the ones with mulch. Thus, the combination of manure and mulch is recommended for uptake by crop farmers in the study areas, if they are to overcome drought stress and adapt to changes in climate. More research is needed to quantify nutrient losses resulting from runoff under the different SWC techniques. Modeling such effects is essential in assessing the impacts of SWC practices on soil and crop productivity.

关键词： Runoff soil loss SWC drought area Uganda.

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A New Regression Type Estimator with Two Auxiliary Variables for Single-Phase Sampling

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Open Journal of Statistics 2014年第9期4卷 789-796页

作者： everline Chemutai Tum John Kung’u Leo Odongo Department of Statistics and Actuarial Science Kenyatta University Nairobi Kenya

In this paper, we have proposed an estimator of finite population mean using a new regression type estimator with two auxiliary variables for single-phase sampling and investigated its finite sample properties. An empirical study has been carried out to compare the performance of the proposed estimator with the existing estimators that utilize auxiliary variables for finite population mean. It has been found that the new regression type estimator with two auxiliary variables for to be more efficient than mean per unit, ratio and product estimator and exponential ratio and exponential product estimators and exponential ratio-product estimator.

关键词： Regression Estimator Exponential Ratio-Product Estimator Auxiliary Variables Mean Squared Error

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The Effect of Land Use on Soil Organic Carbon Stocks in Lake Victoria Crescent Agro-Ecological Zone, Uganda

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Journal of Agricultural Science and Technology(A) 2016年第3期6卷 154-160页

作者： David Akodi everline Komuttmga Choice Agaba Kevin John Oratungye Elizabeth Ahumuza Soils Agro-Meteorology and Environment Program National Agricultural Research Laboratories (NARL) Kampala 7065 Uganda

The effect of land use on soil organic carbon （SOC） stocks and depth distribution of SOC was investigated in the Lake Victoria Crescent ago-ecological zone of Uganda. Soil samples were collected from six land use types at 0-30, 30-60 and 60-90 cm from profile pits dug in similar soils and slopes. Results indicated that SOC stocks significantly differed across the various land use systems. SOC also varied significantly by depth. The highest SOC and pH were recorded under natural forest-strict nature. Grassland had the lowest SOC but the highest bulk density （BD）. Phosphorous （P） was the highest in banana-coffee systems and the lowest under tea plantations. The lowest values of pH and BD were found in highly disturbed natural forest. The upper layers of the soil （0-30 cm） stored higher amounts of SOC compared to other depths （30-60 cm and 60-90 cm）. Land use therefore has a significant effect on SOC and other soil physical and chemical properties.

关键词： Soil organic carbon land use change land use systems Mabira forest.

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