PURDUE UNIVERSITY. FARMING SYSTEMS UNIT OF THE SEMI-ARID FOOD GRAIN RESEARCH AND DEVELOPMENT PROGRAM
Literature review of soil fertility in the West African semi-arid tropics (WASAT)
Increasing population pressure has forced many farmers in the West African semiarid tropics to decrease, if not eliminate, fallow periods and rely on chemical fertilizer in order to maintain soil fertility.
Schaber, Lee · 1985
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Abstract
Under intensive and continuous cropping, nutrient imbalances, especially those of sulphur and the micronutrients, may arise and increase in frequency and severity with increases in production intensity. Relevant information on these imbalances is consolidated in this literature review. Specific items covered include fertilizer elements (phosphorus, nitrogen, potassium); macroelements (calcium and magnesium, sulphur); and micronutrients (boron, molybdenum, zinc, manganese, copper, and iron). A 90-item list of references (1951-85) in English and French is appended. (Author abstract, modified)
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