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  1. Vol. 64 No. 5, p. 641-644
     
    Received: Nov 8, 1971
    Published: Sept, 1972


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doi:10.2134/agronj1972.00021962006400050028x

Effect of Soil Management on Corn Yield and Soil Nutrients in the Rain Forest Zone of Western Nigeria1

  1. Akinola Agboola and
  2. Adeboyejo Fayemi2

Abstract

Abstract

The problem of maintaining soil fertility by shifting cultivation is becoming increasingly difficult in Nigeria as rapid population growth places more strain on land resources, thereby decreasing the fallow period. Researchers are therefore confronted with the difficulty of finding an alternative low-cost farming system that can maintain soil fertility.

An experiment on soil management practices involving both interplanted legume crops in rotation plus fertilizer was set up to investigate the above problem. The experiment was conducted in Ibadan, Nigeria, which has an annual rainfall of 140 cm and average temperature of 25 C. The experiment was located on Iwo soil series with unusually high available P (100 kg/ha) and exchangeable K (600 kg/ha), soil pH of 6.5, and CEC 15 meq/100g.

The results show that fertilizer (55-10-55 kg/ha of NP-K) increased yields of corn (Zea mays L.) from 1,510 to 2,460 kg/ha. Legumes [greengram (Phaseolus aureus), cowpea (Vigna sinensis), and calopo (Calopogonium muccunoides)] either interplanted or rotated also increased the yield of corn. The magnitude of the increase for calopo was equivalent to that for the fertilizer. Legumes tended to conserve available P and exchangeable K in the surface soil.

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