A fairly good yield of rice can be obtained over
a number of years without adding any
nitrogenous manure because:
Answers
Answer:
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Explanation:
ANSWER
The rice paddy field contains the Azolla weeds with the nitrogen-fixing cyanobacteria which can help in the conversion of the atmospheric nitrogen to nitrates. This nitrate can be used for the growth of the plants without the introduction of nitrogenous manures externally. These organisms help increase the yield of the rice plants.
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Answer:
Blue-green algae represent a self-supporting system capable of carrying out both photosynthesis and nitrogen fixation, the energy bill for the latter process being paid by the sun. Rice is perhaps the only major cereal crop to whose nitrogen economy the nitrogen-fixing blue-green algae make a significant contribution.
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