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=**Plants Require Nutrients**= ====Plants material consists of carbohydrates, their made of the elements carbon, oxygen, and hydrogen. //Macronutrients// are needed in large quantities, and micronutrients are needed only in trace quantities. Plants need nitrogen so they can build up proteins and other biomolecules, for example chlorophyll, which is the green pigment in charge of photosynthesis.====

====**Nitrogen fixation** is any chemical reaction that converts atmospheric nitrogen to a form of nitrogen that the plants can use. The most common forms of nitrogen fixation are //ammonium ions// and //nitrate ions//. Ammonium ions come from nitrogen fixation carried out by a bacteria living in the soil. Most of the nitrogen fixation is recycled from one organism to the next organism. In addition, after the plant dies, the bacterial decomposition of that plant releases ammonium and nitrate ions back to the soil, where its provided for the plants living.====

====Plants that end up not getting enough nitrogen have stunted growth as a result. The yellowing of leaves is considered in older leaves, younger ones stay green. //Potassium ions// activate enzymes needed for photosynthesis and respiration. Potassium deficiency have small areas of dead tissue along the leaf tips or the edges. The deficiency appears mainly on the older leaves. When cereal grains are potassium deficient, they will develope weak stalks and the roots will become more easily infected with root-rotting organisms.====

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