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Zinc deficiency may cause yellow and possibly bronze coloration of leaf edges and tips. Leaves may be crinkled, and plants may be stunted. Flower formation or retention may be less than normal. Pods may be abnormal and slow to mature.
Zinc deficiency is most likely to occur on high pH, sandy, high phosphorous, or low organic matter soils. Soil-applied zinc fertilizer can solve this problem. Be sure to use a highly soluble zinc source; some insoluble zinc products are marketed. On high-pH soils, use of a chelate will improve availability of applied zinc fertilizer. Manure is also an excellent source of zinc and other micronutrients, especially on high-pH soils. Foliar zinc applications will correct symptoms, but may need to be repeated if symptoms re-develop. |