The uptake of foliar-applied zinc this is influenced by humidity. Specifically, uptake is negatively impacted if the zinc is applied under low humidity, as the zinc is "locked up" by leaf waxes as the droplet dries on the surface of the leaf, thereby rendering the zinc useless. Described herein is a foliar zinc fertilizer comprising (a) zinc sulphate in combination with a mixture of (b) urea and (c) a substance with a suitable point of deliquescence (POD) such as organic surfactants, calcium chloride, magnesium chloride or combinations thereof.
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