Nutrients Lost From a Nitisol with No Conservation Measures In Githunguri Division of Kiambu District, Kenya

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Date
1989
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Kenya Soil Survey
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The study to determine plant nutrients in eroded sediments was carried out during the short rains of November 1988 to February 1989 using runoff plots. Twelve plots, six on a 4% slope and six on a 24% slope were used. Four cover crops namely; beans, maize, inter-cropped maize and beans, and Irish potatoes were used. Two control plots, one bare and one with 100% grass cover were also used. On average more nutrients were lost from the more gentle slopes in terms of nutrients lost per 100 grams soil in milli equivalent percent. The steeper slopes had more net nutrient losses in kg per hectare due to higher amounts of soil lost per plot per hectare. The grass plots reduced erosion by 100% on both slopes. From the results the primary plant nutrients namely; Carbon and Nitrogen suffered the highest losses. Conservation measures which can protect the soil from eroding are necessary in the area to lessen the nutrient loss.
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