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Phosphatic Fertilizers Solubility

The nutrient phosphorus present in phosphate fertilizers is usually expressed in terms of phosphoric anhydride or simply as phosphorus pentaoxide, P2O5 the availability of phosphorus in which it is present. The amount of phosphorus available to the plants depends upon the extent to which the fertilizer supplies HPO4 or H2PO4 - ions. According to the solubility, the phosphatic fertilizers are divided in following groups.

Water soluble phosphatic fertilizers

These fertilizers contain phosphorus in available form in neutral soils, which can be readily absorbed by young plants. In acid, soils and free iron, aluminum hydroxy phosphates but in alkaline and calcareous soils, water soluble phosphorous is converted into insoluble calcium phosphate.

The common examples of these fertilizers are:

  1. Single Super phosphate
  2. Double super phosphate
  3. Triple super phosphate
  4. Ammonium phosphate

Citric acid soluble Phosphatic Fertilizers

The citric soluble fertilizers are suitable for acidic soils because at low pH citrate soluble phosphorus is converted to monocalcium phosphate not as water soluble phosphate and therefore, phosphorus is not fixed as iron and aluminum phosphate.

  1. Di-calcium phosphate
  2. Basic slag
  3. Calcium metaphosphate

Water and Citrate insoluble phosphatic fertilizers

These mineral fertilizers contain phosphorus, which is insoluble in water as well as in citric acid. They are suitable in strongly acid soils or organic soils. These fertilizers are given in green manured fields. The phosphorus is very slowly released by microbes at action and remains in soil for long time.

  1. Rock Phosphate
  2. Bone meal

Other phosphatic fertilizers

Following are the other phosphatic fertilizers.

  1. Kotka phosphate
  2. Rhenmia phosphate
  3. Thermophos
  4. Pelophos
  5. Coronat phosphate