Question

A green manure supplies

• A. Organic matter
• B. Additional nitrogen
• C. Protect soil against erosion and leaching
• D. All of the above

Answer 1

The correct option is D All of the above

• Green manure acts mainly as soil acidifying matter to decrease the alkalinity/pH of alkali soils by generating humic acid and acetic acid.
• The root systems of some varieties of green manure grow deep in the soil and bring up nutrient resources unavailable to shallower-rooted crops.
• Green manure also can help prevent soil erosion in areas with sandy soil, and help keep weeds from growing.

So, the correct answer is option D.