Effect of oxadiazon, pretilachlor, and their combinations on control of rice weeds
1989
El-Deek, M.H. (Cairo Univ., Cairo (Egypt). Faculty of Agriculture)
Herbicidal efficacy was studied in manually transplanted rice during 1985 and 1986 at Belbeis, Sharkia. Oxadiazon at 1.5 kg ai/ha, pretilachlor at 0.8 kg ai/ha, tank mixture of the 2 herbicides at 1.5 kg oxadiazon + 0.8 kg pretilachlor, and mixture of the 2 at 1.9 kg + 1.0 kg/ha were tested in comparison with handweeding and an untreated check. Major findings were: Either oxadiazon at 1.5 kg ai/ha or pretilachlor at 0.8 kg ai/ha, applied 4 d after transplanting, eliminated the growth of barnyard grass and common weeds completely and gave excellent control of yellow nutsedge and small flowered umbrella plant. Oxadiazon had no harmful effect on rice plants and gave the highest grain yields and heaviest test grain weights. Although pretilachlor gave heavier panicles, it injured rice plants, significantly reducing the number of panicles/meter square. The mixture of the two herbicides at recommended doses controlled barnyard grass and umbrella plant up to 2 mo from transplanting and gave good control of yellow nutsedge; rice grain yields were higher than in the untreated check. The mixture of oxadiazon at 1.9 kg + pretilachlor at 1.0 kg prevented the growth of umbrella plant and sharp rush and gave satisfactory control of common weeds and yellow nutsedge. However, rice grain yield did not differ statistically from the check, probably because of poor crop stand caused by the high doses of the two herbicides. Hand-pulling of rice weeds three times during the growing season provided satisfactory control of most rice weeds, resulting in fairly high grain yield.
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