The depth of root zone for rice crop is about___________________?
Correct answer: C. 90 cm
- A. 70 cm
- B. 80 cm
- C. 90 cm
- D. 100 cm
Explanation
For irrigation planning, rice is commonly assigned an effective root-zone depth of about 90 cm. The actual roots are concentrated nearer the surface, but the standard design value includes the crop’s effective soil-water extraction zone.
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