Critical Stages of Crop Weed Competition

Removal of weeds at a particular stage or keeping the field weed free up to certain period of crop age is more than complete weeding. Earlier or later parts of this critical stages or weed free periods from sowing have been identified for several crops under different agro-climatic conditions in Andhra Pradesh and are given below:



Castor       3rd to 9th week

Groundnut       3rd to 5th week

Sunflower       2nd to 6th week

Sesamum       2nd to 5th week