Question

Percentage of water left in the soil when a plant begins to wilt is known as

• A. Wilting coefficient
• B. pH value of soil
• C. Field capacity
• D. Water holding cpacity

Answer 1

Answer: (A)

Wilting coefficient

Water held tightly by soil particles around them is called as hygroscopic water. It is held in a very thin film and is not available to plants. Plants are able to absorb capillary water, which is present in the capillary spaces between soil particles. Run away water is also not available to plants.

Field capacity denotes total water content in a field including hygroscopic water, capillary water and chemically bound water.

The percentage of water left in soil when plants begin to wilt is called as wilting coefficient. At wilting coefficient soil contains hygroscopic and chemically bound water.

So, the correct answer is 'Wilting coefficient'