The critical period of weed control for cassava planted during the rainy season of Thailand
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Abstract
Weed competition period in the farm production of cassava (Manihot esculenta Crantz) was investigated on the farmer field during May, 2019 to March, 2020. The major weeds infested in this site were grass such as Dactyloctenium aegyptium (L.) Willd., Digitaria ciliaris (Retz.) Koeler., Echinochloa colona (L.) Link, Eleusine indica (L.) Gaertn., Pennisetum polystachion (L.) Schult. A maximum weed biomass was observed on July to October, 2020 about 120 – 160 g (dry weight) m-2. In the weed-free plot, the root yield was 31.6 t ha-1. While, the plot of weed infestation through the season was represented 53% loss of fresh roots. Gompertz and logistic equations fitted to yield data for increasing periods of weed control and weed interference showed that the critical period of weed interference, considering a 5 and 10% yield loss, which appeared between 20 and 114 days after planting, i.e., during the early canopy information and early tuberization stage. Thus, alternative weed management tools should be applied during this period to ensure a high yield of cassava roots.
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References
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