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Annals of Plant Protection Sciences
Year : 2002, Volume : 10, Issue : 1
First page : ( 131) Last page : ( 133)
Print ISSN : 0971-3573.

Optimization of Pretilachlor Dose for Weed Management in Transplanted Rice

Bhowmick Malay K.

Department of Agronomy, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur 741 252, India.

Abstract

Field study during kharif revealed that Echinochloa crusgaUi, Cyperus iria, C. rotundus, Ammania baccifera, Commelina benghalensis and Eclipta alba were the dominant weeds in transplanted rice. Presence of weeds for the entire crop season reduced the grain yield by about 37%. Two hand weedings at 20 and 40 days after transplanting (DAT) could take care of almost all categories of weeds. Pre-emergence application of pretilachlor @ 437.5 g/ha supplemented with one hand weeding at 40 DAT proved more effective than the sole application of the same herbicide. Pretilachlor when applied at 500 g/ha alone or at 437.5 g/ha alongwith one hand weeding at 40 DAT gave results comparable to two rounds of hand weeding in minimizing weeds and improving crop growth and yield. However, the maximum grain yield and enhancement in yield components of transplanted rice were obtained under pretilachlor application at 437.5 g/ha + one hand weeding, followed by hand weeding twice and pretilachlor 500 g/ha.

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Key words

Grain yield, Herbicide, Transplanted rice, Weed management.

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