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Foliar Sprays
Early season foliar applications can partially correct zinc deficiency in a growing crop. The degree of recovery is dependent on how severe the problem becomes before treatment is started. Stunted plants seldom catch up as the season progresses. Spraying should be started not later than the 3-4 leaf stage. With severe deficiencies, 2-3 applications spaced 10-14 days apart will be necessary. Foliar spraying to correct nutrient deficiencies usually allows recovery to 60-80% of normal yields. It's a technical mistake to expect dramatic responses with foliar zinc applications after crops get into the rapid vegetative growth stage.
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