It is also added in some fertilizers as an impurity, especially the lower grade fertilizers. The use of gypsum also increases soil sulfur levels. Aids production of sugar and carbohydrates. Essential for seed and fruit development. Aids in root metabolism and helps in the utilization of proteins.
Chloride is found in the soil.
Sources of iron are the soil, iron sulfate, iron chelate. Soil is a source of manganese. Regulates consumption of sugars. Part of the enzyme systems which regulate plant growth. Sources of zinc are soil, zinc oxide, zinc sulfate, zinc chelate.