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People who might use fertilizer may apply it through the soil, for uptake by plant roots or foliar feeding, for uptake through leaves. Some fertilizers may be organic, which means they could be composed of organic matter. Some fertilizers may be inorganic, which means they could be composed of simple, inorganic chemicals. Fertilizers some times may have trace elements or micro nutrients with a role in plant nutrition, which may include boron, manganese, iron, zinc, copper and molybdenum. Fertilizers available through retail may be composed of three major plant nutrients, which are nitrogen, phosphorus and potassium. Retailers who might sell fertilizers may have the kind of fertilizer that when used intends to promote growth.
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