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Mostly nitrogen, but also significant quantities of phosphorus and potassium. It also must have the full complement of secondary nutrients, calcium, magnesium, and sulfur. It also needs a proper balance of the micro-nutrients boron, copper, iron, manganese, molybdenum, and zinc. It also requires carbon, hydrogen, and oxygen, but gets these from the air and water.

The most important part of all this is that all these elements must be in proper balance. The crop will only do as well as the most limiting nutrient. A farmer can apply a tremendous amount of nitrogen, but if there is not enough phosphorus available, the crop will still not yield well.

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