Figures and tables from this article:
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Fig. 1. The general method for recovery of particulate organic matter and Ludox density separates.
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Fig. 2. Combined maize grain (hybrid 512) and dry bean yields (Rosecoco) at the Kabete long-term experiment during 1994.
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Fig. 3. Effect of soil management on soil organic carbon in a humic nitisol at Kabete, Kenya.
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Fig. 4. Coefficient of determination (r2) of various measures of soil nitrogen and bean yield in a humic nitisol at Kabete, Kenya.
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Fig. 5. Carbon budgets for (a) stover retention and (b) manure addition after 18 yr of soil management at Kabete, Kenya. Asterisks denote C inputs in excess of complete control.
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Fig. 6. Fertility management by farmers in the Kenyan Central Highlands based on 190 household interviews along an elevational transect from 1100 to 3000 m.
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Table 1. Particulate organic C, its density separates and microbial biomass carbon in response to 18 yr of land management of a humic nitisol at Kabete, Kenya
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Table 2. Soil nitrogen pools in response to 18 yr of land management of a Humic Nitisol at Kabete, Kenya
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Table 3. Correlation of soil carbon fractions and soil nutrient properties. *p<0.05; **p<0.01; ***p< 0.001
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- Corresponding author. The Rockefeller Foundation, 13th Floor of International House, P.O. Box 47543, Nairobi, Kenya. Tel.: +254-2-631-643
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Present address: Ministry of Agriculture and Livestock Development, P.O. Box 95, Eldoret, Kenya
Copyright © 1999 Elsevier Science Ltd. All rights reserved.
برچسبها: سه شیوه های مدیریت حاصلخیزی خاک مربوط, سیستم های کشاورزی, Three soil fertility management
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