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Foliar application of fertilizers

Plants can absorb a small amount of nutrients from dilute solutions sprayed on to the leaves. Since the amount of micronutrients needed by plants is very small, these can be supplied as foliar sprays, especially if nutrients are chelated for better absorption. Plants can also absorb macronutrients through the leaves, but it is not possible to supply sufficient amounts this way; these must be taken up by the roots.


Foliar application of macronutrients can help plants recover from temporary stress due to moisture problems, pests or disease. Sprays containing calcium can also be used to prevent blossom end rot in tomatoes and other fruits, or tip burn in lettuce and cabbage which often occurs during dry periods.