Nematodes and maize growth in Nigeria. II. Effects of some amendments on populations of Pratylenchus brachyurus and on the growth and production of maize (Zea mays) in Nigeria

Abstract

The use of nematicidal chemicals is perhaps the most reliable method for a quick and effective control of nematodes infesting crops. However, in Nigeria, it is unrealistic to recommend such chemicals to farmers because most nematicides are toxic to humans and require skilled labour for a successful application; they are also too costly and the increases in yields obtained by their use may not be sufficient to cover costs (Caveness, 1967). Yet, an ever increasing human population demands the growth of more food on continuosly restricted area of available arable land. Other methods must, therefore, be found which can ensure increased crop yields either by killing or reducing nematode pests. The use of soil amendments may offer such a possibility (Walker, 1969; Mankau and Das, 1969; Tomerlin et al., 1968). The present study describes a trial in which such organic amendments were used.