Phosphorus organic forms

Organic phosphorus associations can occur under both acidic and basic conditions. Phosphorus can form esters with organic alcohol functional groups and can be associated with amine groups in various ways. 

Now we are in a position to expand our command of molecules by introducing organic molecules that contain atoms of oxygen, nitrogen, sulfur, and phosphorus. That forms the substance of the next three chapters. 

Phosphorus in the subsurface originates from a natural parent material or anthropogenic application on land surface (e.g., fertilizers, pesticides, surfactant products, sludge, and effluents). This element may be found in inorganic or organic forms, which are in a dynamic equihbrium with dissolved P in the subsurface liquid phase. 

Phosphorus is present in wines as phosphates of calcium, potassium, magnesium, etc., and also in organic form, probably as acid glycerophosphate of potassium and calcium. The addition of phosphate, which sometimes replaces plastering, naturally increases the quantity of phosphorus present. 

Organic forms of carbon, nitrogen, sulfur, and phosphorus (typically less than 0.7 pm in diameter) contribute to bulk DOM. Humic substances,... 

III. ORGANIC FORMS OF LIMITING ELEMENT (LABILE DISSOLVED ORGANIC NITROGEN AND DISSOLVED ORGANIC PHOSPHORUS)... 

Phosphorus in the form of phosphate is the principal source of P for plants. Phosphorus is commonly applied in fertilisers although its uptake by plants is much less than that of N and K and its availability is one of the most common nutritional limitations to crop yield (Bould etal., 1983). Some of the P in soils and soil solutions may be present in organic compounds. However, it is unlikely to be available to plants in its organic form and decomposition of organic matter releases P in its available... 

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