Effect of oxadiazon on growth and yield of rice
1986
Khemphet Chaiyamart | Rangsit Suwanketnikom (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Agronomy)
The effects of oxadiazon [2-t-botyl-4-)2,4-dichloro-5-isopropyloxyphenyl)-1,3,4-oxadiazoline-5-one] and 2,4-D (2,4-dichlorophenoxy acetic acid), alone and in combination, on growth and yield of rice RD 23 when applied at 12 days after emergence were studied in the pot experiment during August to November, 1985 at Department of Agronomy, Kasetsart University. It was found that oxadiazon at 0.415 and 0.83 kg ai/ha produced some moderate phytotoxicity but the rice plants recovered in 2 weeks after application. However, at higher rate oxadiazon resulted in more phytotoxic effects and the plants were shorter statured, low root-shoot ratio, and flowering delayed, but produced more tillers per plant and more panicles per pot. Oxadiazon plus 2,4-D, each at 0.415 kg ai/ha, increased the number of tiller per plant, root and shoot weight after 4 weeks of application, whereas the high rates (0.83 + 0.83 kg ai/ha) gave the highest dry matter production and grain yield at harvest. 2,4-D alone at 0.415 and 0.83 kg ai/ha increased the plant height during 4 to 8 weeks after application. However grain yield and yield components are not statistically different.
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