The Garden Guide

Book: Gardening Science - Soils, Manure and the Environment
Chapter: Chapter 4: Weather and Climate

Nitrogen and plant growth

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1362. Nitrogen, though found in smaller quantities than either oxygen or hydrogen, is yet equally essential to vegetation. It is most useful to plants in the forms of ammonia and nitric acid; for in these states plants are able to absorb and assimilate it, which they do not appear to be able to do in its separate state.