Question

what is weeds? how can be controlled them

Answer 1

Unwanted plants that grow along with crop plants are known as weeds. eg--Xanthium, Parthenium.

Weeds can be controlled using weedicides.

Hope it helps u.

Answer 2

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In a field many other undesirable or unwanted plants may grow naturally along with the crop. These plants are called weeds. We can adopt many ways to remove weeds and control their growth. Tilling before sowing of crops helps in uprooting and killing of weeds, which may then dry up and get mixed with the solil. The best time for the removal of weeds is before they produce flowers and seeds. The manual removal includes physical removal of weeds by uprooting or cutting them close to the ground, from time to time. This is done with the help of a khurpi ora harrow.

Weeds are also controlled by using certain chemicals called weedicides like 2,4-D. These are sprayed in the fields to kill the weeds. They do not damage the crops. The weedicides are diluted with water to the extent required and sprayed in the fields with a sprayer.