Consider the following statements in connection with the soil-water-crop relationship:
Which of the above statements are correct?

1 and 2

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2 and 3

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3 and 4

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1 and 4

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Solution

The correct option is A 1 and 2
Water mainly used by plants is from capillary water.

CIR (consumption irrigation requirement)
$= C_{u} - P_{e f f}$

$C_{u}$ = Consumptive use or evapotranspiration.
From the definition of CIR, it is clear that the portion of evapotranspiration to be satisfied by irrigation is called CIR.
Hygroscopic water is water below P.W.P.

The yield of crop increases only upto optimum depth, beyond that yield starts reducing.

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