Abstract
Abstract The Gambia is a small, densely populated country bisected by the River Gambia in West Africa. Most of the population depends on subsistence agriculture. Groundnut (Arachis hypogea) is the dominant cash crop, with significant hectarage of other grain crops, such as millet (Pennisetum glaucum) and maize (Zea mays), also present. Under the Gambia Agriculture Research and Diversification (GARD) Project contracted by USAID, the University of Wisconsin established a soil testing laboratory at the Yundum Agricultural Research Station to serve both research and service needs. In addition, research has been initiated to develop appropriate soil test interpretations and fertilizer recommendations for specific crops grown on specific soils. A plant nutrient survey of the country was initiated in 1991 and completed in 1992 to help obtain a picture of the soil fertility status of the country. Soil and tissue samples were taken from 1150 fields planted to groundnut, maize, and millet to develop a soil fertilit...
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