Effect of certain weed managements on yield of corn (Zea mays)
1998
Pornchai Lueang-a-papong(Chiang Mai University, Chiang Mai (Thailand). Faculty of Agriculture. Department of Agronomy)
Field experiment was conducted at Faculty of Agriculture, Chiang Mai University during July-October 1997. The objective of this study was to assess the efficiency of certain weed control methods on yield of corn (var. Suwan no.3). The method of hand weeding 1 time at 15 days after planting could increase yield of corn 29.0 percent when compared to non weeding plot. The following of hand weeding at 30 days after planting gave higher yield 63.0 percent. However the following of hand weeding at 45 days after planting could increase yield 75.8 percent. The application of preemergence herbicide propisochlor (2-chloro-N-(isopropoxy methyl-N-(2-ethyl-6methylphenyl)-acetamide) 172.8 g ai/rai provided 37.1 percent higher yield of corn. The application of propisochlor and following with hand weeding at 45 days after planting was able to increase yield 57.2 percent. The application of propisochlor and following with hand weeding at 45 days after planting was able to increase yield 57.2 percent. The application of propisochlor as preemergence herbicide and following with non-selective postemergence herbicide paraquat (1,1/-dimethyl-4,4/-bipyridinium ion) 110.4 g ai/rai at 45 days after planting could increase yield up to 45.9 percent. The application of paraquat alone 1 time at 45 days after planting for postemergence weed control showed higher yield of corn 28.8 percent. It was also found that the non weeding plot gave yield of corn only 327.83 kg/rai.
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