Nitrogen is an essential nutrient for plant growth. But farmers
who cultivate pulse crops like green gram, bengal gram,
black gram, etc. do not apply nitrogenous fertilizers during
cultivation. Why?
NCERT Class VIII
Science - Exemplar Problems
Chapter 1. Nuitrion in Plants
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because they,re plants of leguminocaea family.their roots have rhizobium bacteria which can fix atmospheric nitrogen into nitrates.hence such plants get nitrogen nutrient without any fertilizers
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