Low Substrate Manganese 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 Mn (eg.
calcium nitrate + potassium nitrate).
1. Use a fertilizer that contains Mn.
2. Corrective drench application of manganese sulfate at 10 ppm
of Mn for soilless substrates. Add 0.5 oz. (14.2 g) of manganese
sulfate (28% Mn) per 100 gallons of water. Rinse off foliage. Test
on a few plants first. Do not over apply.
3. To apply a foliar spray of Mn: mix 2 oz. (56.7 g) of manganese
sulfate per 100 gallons of water. It will give a final concentration
of 40 ppm Mn. 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 Mn provided through the irrigation water.
||1. Use a fertilizer that contains Mn.
|Don't forget to check out the Plant Root Zone Management
(PRZM) Manual for more information! Want to know more? Click
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