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Phosphorous for agricultural applications is available to growers in two (2) distinctly different forms for two entirely different approaches to plant nutrition.Looking for the limiting factor in the soil system is one of keys to building soil fertility and getting the soil back in balance. Calcium, Phosphorous and Magnesium are the major nutrients that usually needs addressing.As a general rule, the advantages of such elements are

CALCIUM: Is a limiting in most soils, especially those soils that have been abused by the use of synthetic fertilizers.
PHOSPHOROUS: On the other hand, is transported through the entire plant and is needed throughout the lifetime of the plant.
MAGNESIUM: It is essential part of chlorophyll (green coloring of the leaves).