Question

What are weeds? Give two examples of weeds? Explain why removal of weeds are necessaryin crop fields? Explain the method to control weeds.

Answer 1

weeds are undesirable wilds plants that grown in our crop field .examples -xanthium, parathenium, chenapodium, challis. removal of weeds are necessary because it share sunlight, water, and nutritions, and retand (stop) the growth of crop yield. it is control by weeding. it is two types
1. manually
2. by using weedicides such as malathin 2-4d, 4-d metachlone

Answer 2

Answer:

Explanation: Many undesirable plants called weeds grow with the crop plants. They share water, sunlight and nutrients with the crop plants.

eg: Chaulai (Amaranthus virdis)

Saathi (Trianthema)

The weeds compete with the actual crop for space, nutrients and water. Hence, the removal of these unwanted plants provides an ample amount of nutrients and water to the crops. ... It loosens the soil, which helps in the penetration of water to the roots of the cultivated plant.

Mechanical control consists of methods that kill or suppress weeds through physical disruption. Such methods include pulling, digging, disking, plowing and mowing. Success of various mechanical control methods is dependent on the life cycle of the target weed species.

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