N can have a negative effect on yields if over-applied. Preventing soil erosion is the best way to prevent P from contaminating surface water systems. Calcium, magnesium and sulfur are also supplied to plants through the soil and can be added through commercial fertilizers and other soil amendments such as lime and gypsum. Testing can tell you how much, if any, is needed. Boron, chloride, copper, iron, manganese, molybdenum and zinc are required by soils in small amounts.
Proper testing is important to correct deficiencies and prevent toxicity from excesses.
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