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Agronomy QUESTION #2041
Question 1
Green manuring is most agronomically beneficial in which soil and cropping context?
  • Sandy loam soils in arid climates with continuous cereal monoculture
  • Degraded soils with low organic matter in rice–wheat systems, where leguminous green manure crops (e.g., Sesbania, Dhaincha) are incorporated before transplanting to improve N supply and soil health✔️
  • Heavy clay soils with existing high organic matter content
  • Saline-sodic soils where green manure crops cannot establish
Correct Answer Explanation
Green manuring with legumes (Sesbania bispinosa/Dhaincha) is most valuable in rice–wheat systems on degraded soils. The incorporated green biomass provides 80–120 kg N/ha, organic matter, and improves soil physical properties. It is especially critical in South Asian irrigated plains where soil organic matter is critically low (<0.5%).