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The short and sweet answer is that, in many ways, Nitrogen functions in plants in a similar fashion as Iron does in animals. Without Iron, animals become anemic. Without Nitrogen plants become anemic. Nitrogen is a component of many plant chemicals including cellulous, protein, chlorophyll, and some gums. If you want a plant to grow and green-up, it needs Nitrogen in some form. It is usually the most needed element when fertilizing plants for two reasons. 1) It is about the most easily leached element in the soil. Any added water causes the free Nitrogen to flow away. 2) Calcium from stucco, or cement leaches easily into the soil, and Calcium competes for the same absorption sites on the roots, as Nitrogen. So plants near stucco or sidewalks are often Nitrogen starved and often need even more added Nitrogen in the soil than the same plants some distance from stucco, bricks, sidewalks and foundations.

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