Question

Match List-I with List-II. List-I Soil moisture: A. Saturation, B. Field capacity, C. Permanent wilting point, D. Hygroscopic coefficient. List-II Detail: I. Water held by soil against an applied pressure of 15 bars, II. When all pores of the soil are filled with water, III. Maximum amount of water that a soil will retain after allowing free drainage, IV. The water held by the soil at 31 bar.

• A. A-III, B-II, C-IV, D-I
• B. A-II, B-III, C-I, D-IV
• C. A-III, B-II, C-I, D-IV
• D. A-IV, B-II, C-I, D-III

Hint:

Field capacity is after free drainage, while permanent wilting point is around 15 bar soil moisture tension.

Answer 1

The Correct Option is B

Concept:
Soil moisture constants describe different levels of water held in soil.

Step 1: Saturation.
Saturation means all soil pores are filled with water. \[ A\rightarrow II \]

Step 2: Field capacity.
Field capacity is the maximum amount of water retained by soil after free drainage. \[ B\rightarrow III \]

Step 3: Permanent wilting point.
Permanent wilting point is the water held by soil at about 15 bar pressure. \[ C\rightarrow I \]

Step 4: Hygroscopic coefficient.
Hygroscopic coefficient refers to water held very tightly by soil, commonly around 31 bar. \[ D\rightarrow IV \] Therefore: \[ A-II,\ B-III,\ C-I,\ D-IV \] \[ \therefore \text{Correct Answer is (B)} \]