Pre-emergence application of prometryne at 1.0 kg. a. i./ha and terbutryn at 0.75 kg a. i./ha gave prolonged weed control than alachlor and nitrofen at 1.5 kg a. i./ha, in Co. 2 Cowpea and were economical than hand weeding. Pre-emergence application of either prometryne or terbutryn with one late manual weeding was sufficient for controlling weeds till cropmaturity. Receipt of monsoon rain after spraying the triazino herbicides caused high seedling mortality due to their high solubility.
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