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Studies on chemical weed control in aerobic rice (Oryza sativa L.).

机译:有氧水稻化学防治杂草的研究。

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A field experiment was conducted during kharif 2005 at Agriculture College, V. C. Farm, Mandya to evaluate the efficacy of some pre-emergence herbicides in aerobic rice. The treatments comprised butachlor (0.75, 1.0 and 1.25 kg a. i./ha), pyrazosulfuron ethyl (20, 25 and 30 g a. i./ha), clomozone+2, 4-DEE (0.75, 1.0 and 1.25 l/ha) and two intercultivations and hand weeding at 20 and 45 DAS alongwith weedy check. The field was infested with Digitaria sanguinalis, Cynodon dactylon, Aegeratum conyzoids, Commelina benghalensis, Celosia argentia and Cyperus rotundus. The application of herbicides reduced the weed population and weed dry matter production and increased the grain yield significantly. Among herbicides, pyrazosulfuron ethyl @ 30 g a. i./ha has shown best results in reducing weed population and weed dry matter specially sedges with an efficiency of 90.86% and recorded higher grain yield (5.0 t/ha) and was comparable with hand weeding at 20 and 45 DAS. The maximum net returns (Rs. 21019/ha) and benefit:cost ratio (2.15) were recorded with pyrazosulfuron ethyl @ 30 g a. i./ha.
机译:2005年Kharif在Mandya的V.C. Farm的农业学院进行了田野试验,以评估某些芽前除草剂在有氧水稻中的功效。处理包括丁草胺(0.75、1.0和1.25 kg ai / ha),吡唑磺隆乙基(20、25和30 g ai / ha),氯莫zone + 2、4-DEE(0.75、1.0和1.25 l / ha)和两次互作并在20和45 DAS进行除草,并进行除草检查。该田地被 Digitaria sanguinalis , Cynodon dactylon , Aegeratum conyzoids , Commelina benghalensis ,阿根廷鸡冠花和圆形莎草。除草剂的施用减少了杂草的数量和杂草干物质的产生,并显着提高了谷物的产量。除草剂中,吡唑磺隆乙酯@ 30 g a。 i./ha在减少杂草种群和杂草干物质的特别莎草方面显示出最佳结果,效率为90.86%,并记录了更高的谷物产量(5.0吨/公顷),与20和45 DAS的手工除草相当。吡唑磺隆乙酯@ 30 g a记录了最大净收益(Rs。21019 / ha)和收益:成本比(2.15)。我/公顷

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