Q) fertilizers are which chemical substances ?
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Fertilizers are chemical substances supplied to the crops to increase their productivity. These are used by the farmers daily to increase the crops yield. The fertilizers contain the essential nutrients required by the plants including nitrogen, potassium, and phosphorus.
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Modern chemical fertilizers include one or more of the three elements that are most important in plant nutrition: nitrogen, phosphorus, and potassium. Of secondary importance are the elements sulfur, magnesium, and calcium
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