Discussion
Select the correct equation to show the water requirement of crops in terms of source of water.
Given- WR= Water reqirement
IR= Irrigation requirement of crop at field head
ER= Effective rainfall
S= Stored moisture
Answer: B
The equation is WR= IR + ER + S.
The water requirement of a crop can be met from three sources: water applied by irrigation (IR, measured at the field head), the part of rainfall that the crop can use (effective rainfall, ER), and the moisture already stored in the root zone that the crop draws on (S). The total requirement is their sum.
The options with subtraction rearrange the same terms wrongly. IR alone equals WR minus ER minus S, so writing WR as IR minus any of the other sources reverses the relation.
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