Nitrogen is an important constituent of protein and
protoplasm. And essential for the growth of plants. Its shortage
leads to chlorosis ( yellow of leaves) and stoppage of growth. Its
excess adversely effect the quality of fruit. Its presence in moderate
doses is essential for plant growth and fruiting. it is usually
deficient in soils. Nitrogen given to plants in the forms organic
manure and artificial fertilisers. It is also present in the air but
plants can not directly avail of it. The lithosphere and atmospheric
content of molecular nitrogen are 18 x 1015 and 3.8 x 1015
tones . In plant nitrogen lost through leaching, erosion or escape of
ammonia or elemental N into the atmosphere.
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