By F. Makken (auth.), A. Uzo Mokwunye (eds.)
Tropical Africa escaped from the glaciers that coated the temperate elements of the realm in the course of the Ice Age. The legacy is that the majority of the dad or mum fabrics of the soils of tropical Africa are outdated, hugely weathered and with out bases and phosphate-bearing minerals. conventional farming structures that have been particularly strong and sustainable trusted lengthy fallow classes after one to 2 years of cropping to take care of the efficient means of the soils. lately and particularly in densely populated components, a tremendous classification of 'landless' farmers have started to domesticate marginal lands or to invade the 'forest reserves' thereby exacerbating the issues of land and environ psychological degradation. of soil fertility that would facilitate the construction of sufficient amounts of the primary protecting a degree staples has turn into an immense problem to agricultural scientists in tropical Africa. to extend the nutrient offering energy of soils calls for the inputs of fertilizers. those could be natural or inorganic. The potency with which those externally provided inputs can bring up agricultural creation and decrease soil and environmental deterioration relies at the skill of scientists to figure out the appropriate varieties and amounts of the goods to use to every soil, crop and cropping approach in addition to the facility of farmers to procure needful farm deal with ment skills.
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Additional info for Alleviating Soil Fertility Constraints to Increased Crop Production in West Africa
Nnadi LA and Arora Y (1985) Effect of nitrogen sources and soil properties on crop yield in the savanna. Pages 223-233 In: Kang BT and van der Heide J (eds) Nitrogen Management in Farming Systems in Humid and Subhumid Tropics. Institute for Soil Fertility (IB), 9750 RA, Haren, The Netherlands and International Institute of Tropical Agriculture (lITA) , Ibadan, Nigeria, Haren (GR) The Netherland 38. Pieri C (1985) Management of Acid Tropical Soils in Africa. Pages 41-61 In: IBSRAM (International Board for Soil Resources and Management) Management of acid tropical soils for sustainable agriculture: proceedings of an IBSRAM inaugural workshop.
Pages 181-185 In: World Meteorological Organization and International Rice Research Institute. Proceedings of a Symposium on the Agrometeorology of the Rice Crop. IRRI, Manila, Philippines 29. Lawson TL (1981) Agroclimatic zones of West Africa. lIT A Annual Report for 1980. International Institute of Tropical Agriculture, Ibadan, Nigeria 30. Lawson TL and Lal R (1982) Crop water requirements and water-use efficiency in the Humid/Sub-humid zone of West Africa. Proceedings Fourth Afro Asian Regional Conference of lCD, Lagos, Nigeria.
2, West Africa: Composite map of vegetation zones and duration of humid period (No, of months with precipitation Pot evapotranspiration), Adopted from Steiner  and Lawson , Legend - - - Number of months with rainfall;;;' Pot evapot; - - - Boundries of vegetation zones S = Sahel, SS = Sudan Savanna; .... NGS = Northern Guinea Savanna SGS = Southern Guinea Savanna; 0000 Northern Limit of Derived Savanna (DS), Rainfall: high variability in space and time Temporal and spatial variation in rainfall is a well marked characteristic of the West African region as a whole [27, Figs.