Postemergence application of herbicides in pre-germinated direct-seeded rice
1993
Arthit Kukam-oo
Objectives of the experiments is to study the influence of postemergence grass herbicides on some rice cultivars and the efficiency of grass herbicides in combination with broadleaf herbicides for control of some major weeds in pre-germinated direct-seeded rice. All rates of quinclorac (70, 140 and 280 g ai/ha) had no phytotoxicity on all rice cultivars. In contrast haloxyfop at the rate of 130 and 260 g ai/ha, clethodim and cloproxydim at the rate of 140 and 280 g ai/ha had considerable phytotoxicity on all rice cultivars. However, fenoxaprop, fluazifop and sethoxydim (70, 140 and 280 g ai/ha) caused phytotoxicity on rice only when their high rates were applied. The herbicide-tolerant rice cultivars appeared to be RD 23 and SPR 60 whereas RD 21 and PTN 60 were susceptible. Sethoxydim+bensulfuron (at the rate of 95+35 g ai/ha), sethoxydim+2,4-D (95+900), quinclorac+bensulfuron (350+35), quinclorac+metsulfuron (350+3.75), quinclorac+cinosulfuron (350+20), fenoxaprop+bensulfuron (50+35), bensulfuron (35), metsulfuron (3.75), cinosulfuron (20), 2,4-D (900) and thiobencarb/propanil (2,000) had considerable efficiency to control various weed species, as a consequence, rice produced high grain yield.
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