Question

Which one of the following crops would need a minimum quantity of NPK or urea paddy, peas, wheat, sugarcane?

Answer 1

Peas

Pea is a legume crop which has Rhizobium bacteria in its root nodules, so it needs less nitrogen.

Answer 2

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Of all the plants listed above, the peas are the ones which would need the minimum quantity of NPK because the peas have dicotyldons(two seed leaves) or they are dicot plants having root nodules in their roots. These nodules are the shelter for the nitrogen fixing bacteria called $\large{\rm{\red{\underline{Rhizobium \tiny{sp.}}}}}$

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The leguminous plants are generally the pulses or the ones rich in proteins. They are the body building foods. They belong to the pea family or fabaceace family. The legumes have root nodules where the nitrogen fixing bacteria Rhizobium lives. The Rhizobium fixes nitrogen and releases the nitrogen into soil, so that plants can absorb.

These plants are also grown during crop rotation or along with main crops for fixing the soil with nitrogen or increasing the nutritional value of the soil. Hence, these plants are also known as "Green Fertilizers". These are cheap and affordable, so they are also known as poor man's fertilizers. Some of the very important legumes are peas, soyabean, peanuts, beans, lentils, alfalfa etc.

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• The diagram of root nodules found in the roots of leguminous plants.

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