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The minimum length of shelter belt should be how many times of its height?
EXPLANATION
Storage Entomology & Grain Fumigation
- Aerodynamic Design of Shelterbelts and Windbreaks:
- shelterbelt reduces downwind wind speed over a leeward distance proportional to its height ($H$).
- To prevent wind eddies from wrapping around the flanks and eroding protected fields, the minimum continuous length of a shelterbelt should be at least 24 times its height ($24 H$).
- Conclusion: 24 (Option 2).
Correct option: (2) 24
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