Zinc sulfate should be used in dry fertilizer blends when the soil zinc levels are lower than 7 ppm, or if zinc to copper ratios are off. Normal rates are 5-10 lbs. per acre although higher application rates may occasionally be beneficial. Zinc directly effects leaf size. Zinc can be applied annually as long as zinc levels do not become too high. If all trace minerals are low, consider using Micro Hume instead.
Disclaimer: NOP approved with restrictions on zinc.
- Per pound
- 50 lb. Bag
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