Question

What harm can be caused to crop if they are excessively irrigated?

Answer 1

Too much water actually is bad for most of our trees and plants. If soil becomes water logged and stays that way as poorly draining clay soil tends to do the water can cut off the air supply to the roots and to the microorganisms that live in healthy soil. It can lead to root rot or other diseases.

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Answer 2

If the crop it's over irrigated then the soil may flow away. It may become very loose to hold the crops tight. May be the roots of the crops rot due to over supply of water than it is needed.

Hope it helps u