ALLEVIATING SOIL FERTILITY CONSTRAINTS TO INCREASED CROP PRODUCTION IN WEST AFRICA - THE EXPERIENCE IN THE SAHEL

被引：68

作者：

BATIONO, A

MOKWUNYE, AU

机构：

[1] IFDC-Afrique, Lomé

来源：

FERTILIZER RESEARCH | 1991年 / 29卷 / 01期

关键词：

SEMIARID WEST AFRICA; SAHEL; SOIL FERTILITY; FERTILIZERS; ON-FARM EVALUATION;

D O I：

10.1007/BF01048992

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

Lack of moisture limits crop production in semi-arid west Africa but poor soil fertility is a more serious constraint in the long run. Work done by IFDC and ICRISAT showed that phosphorus is the most limiting nutrient although response by millet to nitrogen when moisture and P are non-limiting can be substantial. A summary of the results of field trials in Niger showed that the sufficiency level for P estimated by regression analysis on the basis of Bray 1 extractable P is 7.9-mu-g P/g of soil for 90% of maximum yield of millet. Application of 15-20 kg P/ha was usually adequate for optimum yields. Matam phosphate rock (PR) from Senegal, Tilemsi PR from Mali and Tahoua PR from Niger which are medium reactive were found to be suitable for direct application while partial acidulation (50% with sulfuric acid) of the less reactive phosphate rocks resulted in products with similar agronomic effectiveness as commercial superphosphates. Tests conducted by farmers showed that millet yields can be increased by more than 250% by the use of fertilizers. The need for constant monitoring of the crop needs for sulfur and potassium under continuous cultivation was highlighted.

引用

页码：95 / 115

页数：21

共 38 条

[11]

Hammond L.L., Chien S.H., Mokwunye A.U., Agronomic value of unacidulated and partially acidulated phosphate rocks indigenous to the tropics, Advances in Agron, 40, pp. 89-140, (1986)

[12]

Hammond L.L., Chien S.H., Roy A.H., Mokwunye A.U., Solubility and agronomic effectiveness of partially acidulated phophate rocks as influenced by their iron and aluminum content, Fert Res, 19, pp. 93-98, (1989)

[13]

Juo A.S.R., Kang B.T., Availability and transformation of rock phosphates in three forest soils from southern Nigeria, Comm. Soil Science and Plant Analysis, 9, pp. 495-505, (1978)

[14]

Khasawneh F.E., Doll E.C., The use of phosphate rock for direct application to soils, Advances in Agronomy, 30, pp. 159-205, (1978)

[15]

Lang M.G., Cantrel R.P., Ohm H.W., Sawadogo S., FSU/SAFGRAD 1983 annual report, (1984)

[16]

Lehr J.R., McClellan G.H., A revised laboratory reactivity scale for evaluating phosphate rocks for direct application. bull. 43, (1972)

[17]

Matlon P.J., A critical review of objectives, methods and progress to date in sorghum and millet improvement: A case study of ICRISAT/Burkina Faso, Appropriate technologies for farmers in Semi-Arid West Africa, (1985)

[18]

McClellan G.H., Notholt A.J.G., Phosphate deposit of Tropical Sub-Saharan Africa, Management of Nitrogen and phosphorus fertilizers in Sub-Saharan Africa, (1986)

[19]

McNamara R.S., The challenge for sub-saharan Africa. Sir John Crawford Memorial Lecture, November 1, (1985)

[20]

Menon R.G., Chien S.H., Hammond L.L., Comparison of Bray 1 and Pi soil tests for evaluating phosphorus availability from different partially acidulated phosphate rocks, Plant and Soil, 114, pp. 211-216, (1988)

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