Rahim removed weeds in his crop field, but David did not. Guess who get more yield. Why?

Rahim will get more yield than David. Weeds are unwanted plants that grow along with our food crops and compete for light, space, nutrients, water etc. thus reducing our crop yield. Some weeds are also poisonous which may damage crops. Some interfere in harvesting. Some weeds are a carrier of diseases, serve as host for different diseases. Thus it is necessary to remove weeds from time to time so that it will not interfere with crop yield.