Question

Which factor doesn’t influence the root zone depth?

(a) Type of soil

(b) Type of crops grown

(c) Sub-soil formation

(d) The yield of the crop

This question was addressed to me at a job interview.

Asked question is from Optimum Utilisation of Irrigation Water topic in section Water Requirements of Crops of Irrigation Engineering

Answer 1

Correct option is (d) The yield of the crop

Explanation: Root zone depth is the maximum distance below the surface of the soil from which a particular crop derives water for use and develops its root system. It usually depends on soil type, subsoil formation, kinds of crop grown, the distance of water table from the ground surface, and amount of water supplied during irrigation.