Field experiments were carried out to study the effect of imazethapyr on weed control and the yield of groundnut. Four rates of imazethapyr (50, 75, 100 and 150 g ha¹) and two times of applications (pre-emergence and early post-emergence) were studied. pre-emergence application of imazethapyr 100g effectively controlled weeds and recorded the highest pod yield which was 124 per cent higher than unweeded control. It recorded the highest net return and the benefit cost ratio. It was economical to manual weeding. Early post-emergence application was ineffective.
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