The effects of weed control on growth and yield of soybean grown in late rainy season
1986
Songchao Insomphun | Veerachai Sriwatanapongse | Kosol Mengampun (Chiang Mai Univ. (Thailand). Faculty of Agriculture. Dept. of Agronomy)
The experiment compared effects of pre and post emergence herbicides with hand weeding and weedy check on growth and yield of SJ 5 soybean grew under upland rainfed conditions. The treatments studied were alachlor 0.27 kg ai/rai, haloxyfob methyl 0.02 kg ai/rai, fluazifob methyl 0.06 kg ai/rai, hand weeded at 30 days after planting and weedy check. The results indicated that grassy weed and broadleaf weed were major infestation while cyperaceae weed infestation was not very significant. Weed infestation1963 during the early growth stages of soybean was comparatively low, while in the reproductive growth stages the infestation increased. Hand weeding gave effective control of grasses and broadleaf weeds, whereas alachlor provided moderate control. Haloxyfob methyl 0.02 kg ai/rai gave effective grassy weed control. Although fluazifob butyl 0.06 kg ai/rai showed the same effectiveness in controlling grassy weed as haloxyfob methyl, it took longer time. However, both herbicides were unable to control broadleaf weeds. In terms of growth and yield of soybean, the results indicated that the treatments had no significant effect on total dry matter, leaf area index, plant height and node number. Average seed yield from hand weeded treatment (365 kg/rai) tended to be higher than those (319 and 309 kg/rai) of haloxyfob methyl and alachlor treatments. Yields (294 and 247 kg/rai) for fluazifob butyl and weedy check were significantly lower than that for hand we
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