Magnesium promotes chlorophyll formation and activates plant growth enzymes. Calcium and magnesium are also used in the leaves to neutralize toxic acids which form as a by-product of metabolism. As we clean up air pollution and change to other fungicides, sulfur deficiency has become more of a concern. Calcium and sulfur can also be provided through gypsum. These include iron, manganese, boron, zinc, copper, molybdenum and chlorine.
Chlorine is required in photosythesis.
Copyright 1998, Don Julien, All Rights Reserved.