Alleviating Soil Fertility Constraints to Increased Crop by F. Makken (auth.), A. Uzo Mokwunye (eds.)

By F. Makken (auth.), A. Uzo Mokwunye (eds.)

Tropical Africa escaped from the glaciers that coated the temperate elements of the area throughout the Ice Age. The legacy is that almost all of the dad or mum fabrics of the soils of tropical Africa are previous, hugely weathered and with out bases and phosphate-bearing minerals. conventional farming structures which have been fairly good and sustainable trusted lengthy fallow classes after one to 2 years of cropping to keep up the efficient capability of the soils. lately and particularly in densely populated parts, a immense type 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 might facilitate the creation of sufficient amounts of the main holding a degree staples has develop into an enormous problem to agricultural scientists in tropical Africa. to extend the nutrient­ providing energy of soils calls for the inputs of fertilizers. those will be natural or inorganic. The potency with which those externally provided inputs can elevate agricultural creation and decrease soil and environmental deterioration relies at the skill of scientists to figure out the appropriate forms and amounts of the goods to use to every soil, crop and cropping method in addition to the power of farmers to obtain needful farm deal with­ ment skills.

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Extra resources for Alleviating Soil Fertility Constraints to Increased Crop Production in West Africa

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6. 7. 8. 9. 10. 11. 12. Aina PO, Lal R and Taylor GS (1977) Soil management in relation to soil erosion in the rainforest of western Nigeria. Pages 75-82 in SCS Soil Erosion: Prediction and Control. Special Publication 211 USA Auberville A (1949) Climats, forest et desertification de I'Afrique tropicale Soc Edit Geog Marit et Col Paris, 351 pp Ayanaba A and Lawson TL (1977) Diurnal changes in acetylene reduction in field-grow cowpea and soybeans. Soil Bioi Biochem 9: 125-129 Charreau C and Nicou R (1971) L'am6iioration du profil cultural dans les sols sableux et sablo argilcux de la zone tropicale seche Ouest Africaine et ses incidences agronomiques.

3. International Food Policy Research Institute, Washington DC, USA 15. Jenkinson DS and Ayanaba A (1977) Decomposition of carbon-14 labeled plant material nnder tropical conditions Soil Sci Soc Am J 41 (5): 912-915 16. Jones MJ (1973) Time of Application of Nitrogen Fertilizer to Maize at Samarn, Nigeria. Experimental Agriculture 9: 113-120 17. Kang BT, Wilson GF and Lawson TL (1984) Alley Cropping: A stable alternative to shifting cultivation. IITA, Ibadan, Nigeria 18. Keay RWJ (1958) Vegetation map of Africa south of the Tropic of Cancer.

In the drier zones to the north (southern Sahelian and Sudanian) most of the rains occur as short intense storms with peak intensities sometimes exceeding lOOmm/h, [5,19]. L. Lawson, UTA, Ibadan Nigeria). The higher amount and frequency of rains with such intensities in these wetter regions accentuate the associated problem of runoff and erosion. Soil loss values ranging from 11 to 33 t/ha/yr on a 5% slope under maize-maize and cassave respectively have been reported [1]. 6 tlha/yr while on bare soils at Sefa, Senegal, a much higher value of 21 tlha/yr under a higher mean rainfall of 1300 mm has been observed [4].

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