Low Substrate Zinc Corrective Procedures
Brian E. Whipker, James L. Gibson, Paul V. Nelson, Todd
J. Cavins, and John M. Dole
Disclaimer: Growers should read and follow all label
directions. Test the corrective procedure on a small number of plants
prior to applying it to the entire crop.
|Not using a fertilizer containing Zn (eg.
calcium nitrate + potassium nitrate).
1. Use a fertilizer which contains Zn.
2. 1. Corrective drench application of zinc sulfate at 13.9 ppm
of Zn for soilless substrates. A corrective fertilization of Zn
will return the tissue to a normal green color within 1 to 2 weeks.
Add 0.5 oz. (14.2 g) of zinc sulfate (36% Zn) per 100 gallons of
water. Do not over apply. Rinse off foliage.
3. To apply a foliar spray of Zn: mix 2 oz. (56.7 g) of zinc sulfate
per 100 gallons of water. It will give a final concentration of
56 ppm Zn. Test on a few plants first. Do not over apply.
Foliar sprays have a greater risk of plant injury. Avoid applications
during the midday heat. Plant uptake is enhanced by prolonged drying
time, which occurs during humid conditions, especially in the morning.
Nutrient uptake through the leaves is also greater in the day than
at night, making morning applications more desirable than evening
|Little or no Zn provided through the irrigation water.
||1. Use a fertilizer that contains Zn.
|Don't forget to check out the Plant Root Zone Management
(PRZM) Manual for more information! Want to know more? Click
© Copyright NC State University, 2002
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