General Studies- III: Environment [10 Marks 150 Words ]
Answer Structure:
- Introduction: About Green Manuring
- Body: Fertile improvement in the soils through green manure
- Conclusion: Quantum of Nitrogen Fixation
Answer
Introduction
Crops grown for the purpose of restoring or increasing the organic matter content in the soil is called green manuring crops Their use in cropping system is called as a green manuring
Legumes are usually utilized as green manure crops as they fix atmospheric nitrogen in the root nodules through symbiotic association with the Bacterium rhizobia
Body
Fertile improvement in the soils through green manure
Crops absorb nutrients from the lower layer of the soils and leave them in the soil surface layer When ploughed in for the use of succeeding crops
Prevent leaching of nutrients to the lower layers
Leguminous green manure plants harbor nitrogen fixing bacteria rhizobia in a root nodules and fix atmospheric nitrogen
Green manure crops increase the solubility of lime phosphates trace elements, etc through the activity of the soil microorganisms and by producing organic acids during decomposition
Conclusion
A crop of green manure on average is reported to fix 60 to 100 kilograms of nitrogen per hectare in a single season under favourable conditions
(The model answer provided by us strictly follows the word limit, the above answer is compiled in 167 words.)
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(Titles : Introduction, Body and Conclusion are just for reference, aspirants should not write these titles in the answer sheet.)