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Secondary nutrients

By Bill Wells,2014-12-24 15:29
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Secondary nutrients Of the three secondary nutrients needed at lower levels than NPK, calcium (Ca) is perhaps the most important. Calcium strengthens cell walls, helping to reduce bruising and disease in fruit, salad and vegetable crops. This means that a good supply of calcium produces food crops that are less prone to damage and have a longer shelf life. Crops short in calci..
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