Experiments were conducted to study the weed control efficiency of herbicides in rice (var. IR. 20), using two forms of pre-emergence herbicides, namely, butachlor (EC) and G) and a post-emergence herbicide. propanil. The pre-emergence application of butachlor [G] at 2.0 kg ai/ha and a post-emergence spray of propanil at 3.5 lit. a i./ha gave the best and economical weed control both under direct sown and transplanted condi- tions.
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