When a plant first begins to wilts permanently in a pot, its 54.5 gms of soil has 4.5 gms of water. The PWP of this soil is:
Correct answer: B. 9%
- A. 4.50%
- B. 9%
- C. 8.25%
- D. 16.50%
Explanation
Permanent wilting point is calculated on the oven-dry soil basis, not on the wet sample mass. The dry soil weighs 54.5 − 4.5 = 50 g, so water percentage is (4.5/50) × 100 = 9%.
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