Seasonal effects on the critical period for weed removal and okra performance on Tithonia diversifolia (Helmsl) A. Gray infested field
By Olabode O.S., Adesina G.O. and A.T. Ajibola
Field experiments were conducted during dry and rainy reasons at the Ladoke Akintola of Technology Ogbomoso to understudy the effects of seasons on okra performance and the critical period for weed removal in Okra on Tithonia diversifolia infested fields. The randomised complete block experiment had ten weeding regimes (treatments) throughout the experimental period. Results of the experiments showed that better growth and yield of Okra occurred during the rainy season than the dry season. Okra performance was not significantly (P=0.05) affected during the rainy seasons when Tithonia weed competition did not exceed 4 WAP. However, during the dry season, okra performance was only comparable to the control when infestation did not exceed 2 weeks after planting (WAP). During the rainy season, weeding beyond the 4th WAP was luxurious while in the dry season luxurious weeding occurred beyond 2 WAP. Similarly, one single weeding that kepts the crop weed free for the first 2 WAP was as inadequate as not weeding at all during the rainy season while in the dry season delayed weeding beyond 2 WAP led to damages that could not be reversed by subsequent clean weeding.
Key words: Season, Critical period, weed removal, Tithonia.
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