Fielf experiments with MCU 6 cotton were laid out on black cotton soil at kovilpatti during 1972-1973 to tudy the effect.on cotton yield .of keeping the field weedy or weed free at different stages of crop growt. - In both years the critical period of weed competition was between and 60days.before and after which the- presence of weeds did not produce advere effects on cotton yields.A high negative correlation could also be established between weight of weeds and yield of cotton.
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