How do Sunhemp or guar help in crop production management? How is it better than fertilizers?

Q. How do Sunhemp or guar help in crop production management? How is it better than fertilizers?
Ans.
• Sunhemp or guar are grown and mulched by ploughing them into the soil prior to sowing of the crop seeds. These help in enriching the soil with nitrogen and phosphorus.
• Sunhemp or guar forms green manures. They are better than fertilizers as they neither destory soil fertility nor cause soil and water pollution.

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