Weed interference in maize zea mays cultivar tzb cowpea vigna unguiculata cultivar vita 5 and maize cowpea intercrop in a subhumid tropical environment 3. influence of land preparation

Ayeni, A.O.; Duke, W.B.; Akobundu, I.O.

Weed Research 24(6): 439-448


ISSN/ISBN: 0043-1737
Accession: 006915760

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The influence of no-tillage and conventional tillage on the outcome of early weed interference in maize (Z. mays L., cv. TZB), cowpea [V. unguiculata (L.) Walp, cv. VITA-5] and their intercrop at populations of 40,000, 50,000 and 30,000 + 40,000 plants ha-1 was investigated on a loamy sand Oxic Ustropept in a subhumid tropical environment between April and July 1980. Both tillage treatments received 60 kg N, 30 kg P2O5 and 30 kg K2O ha-1. Although the weed spectrum was wider under no-tillage, weed weight was only 52% of the weight recorded under conventional tillage 6 wk after sowing and the average food energy yield reductions caused were 28 and 65%, respectively. Cropping pattern had no effect on plot weediness. With minimum or no weed interference, maize performance was better in conventional than no-tillage but worse with prolonged weed interference. Cowpea responded more to weed interference than to tillage practice. Regardless of tillage practice and weed interference duration (up to 6 wk) after sowing, maize monoculture produced the highest food energy yield, followed by maize/cowpea intercrop and cowpea monoculture in that order.