Civil Engineering - Irrigation - Discussion

Permanent wilting point (PWP) or wilting point (WP) is defined as the minimal amount of water in the soil that the plant requires not to wilt.

Answer is none of the above correct answer is temporary wilting point (twp).

@Those who agrees with "none of these". please read the question carefully, it is asked about fails to extract sufficient water.

Permanent Wilting Point - the sufficient amount of moisture cannot be extracted by the plant roots, at this point wilting of the plant occurs.

Temporary Wilting Point - Plant recovers from temporary wilting after some time.

That means in TWP there may be the chance to recover but there is no chance to recover in PWP.

Answer - Permanent Wilting Point.

The correct answer is the maximum efficiency of soil moisture. So it's none of the above.

Answer is correct because below or on PWP plant is not able to extract water. But plant is not able to extract sufficient water below optimum water content.

Answer is option D (none of these).

Permanent wilting point is defined as that moisture content below which plants can no longer extract sufficient water from soil for their growth requirements.

So.

The water at which soil fail to extract sufficient water for their requirement is below permanent welting point that is ultimate welting point.

So, the Ultimate welting point is the correct answer whis is not given in options.