Effect of weeding after pegging period on growth and yield of groundnut
1988
Anont Vatayanonta | Chamlong Kogrum | Marisa Therawatanasakul (Khon Kaen Field Crops Research Center, Khon Kaen (Thailand))
At Mahasarakham, the weed population was quite low, and no yield increase was obtained from weeding. However, at Khon Kaen, there was high weed population, and weeding substantially increased groundnut yield. Compared to two weedings at 10 and 30 days, an additional weeding at 60 days reduced narrow leaf weeds and broad leaf weeds by 74 and 88 %, respectively. Two weedings at 30 and 60 days also reduced the two types of weeds by 65 and 79 %, respectively. However, the increase in groundnut yield did not correlate with the reduction in weed population, presumably due to a limit in the number of pods/plant. Considering the results of this experiment together with the previous experiments conducted in the rainy season of 1986 and dry season of 1987, it can be concluded that, in case of rainy season planting and there is drought stress during flowering stage limiting the number of pods to about 10 pods/plant, weeding after pegging may not give a yield increase. However, if rainfall is well distributed or the crop is grown under irrigation, a yield increase of 7-13 % could be obtained by weeding after pegging. Two weedings at 30 and 60 days could control weed population at early and late growth stages effectively. Spraying of Fluazifob butyl (oneside) at 60 days also gave a good control of broad leaf weeds.
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