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Kurt Becker

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To reduce the edge burn associated with calcium deficiency in poinsettias, growers often spray calcium onto the plants in one of several forms so that the bracts will absorb the nutrient.

One issue with these applications is that calcium sprayed via hydraulic sprayer often leaves visible residue.  Additionally, multiple applications are often required, costing extra labor.

Over the years, various trials have been conducted with applying calcium through an Autofog.  Each of these trials found very good absorption of calcium in the bracts (higher than with wet sprays) and no residue on the plants.

Rates used were calculated using the standard method for calculating rates in an Autofog.  However, depending on the solubility of the form of calcium used, additional water per square foot might be required.

Due to solubility issues, it is not recommended to tank mix calcium with other products in the Autofog. 

Deficiencies in calcium due to the poor translocation of this nutrient results in edge burn and botrytis.  This article in Greenhouse Grower discusses this topic and offers a number of suggestions to mitigate this issue.

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Kurt Becker
Dramm Corporation
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Reply with quote  #2 
Has it been shown to be effective to fog other nutrients?
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