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Insoluble Slow-Acting Fertilisers

The use of bones and bone ash has already been mentioned above. Some varieties of finely ground phosphate rock (e.g. Tunisian Gafsa) are sufficiently reactive to be used as slow-release fertilisers. These are most effective in acid soils. Phosphorite with carbonate impurity has a somewhat higher water solubility than other varieties and is likely to be more suitable for fertiliser use, whereas Kola crystalline rock is quite unsuitable. [Pg.1031]

Steamed bone meal is slightly more effective than the normal variety of bone meal. It usually has a higher P content and this is more readily available to plants. [Pg.1031]

Rhenania phosphate is made by sintering phosphate rock at 1200°C with soda ash and silica, cooling and then grinding. In this way the phosphate rock is opened up and made more suitable for application. Tetracalcium phosphate, Ca4P20g, can be formed as well as calcium sodium phosphates and calcium silicate. The main reaction has been represented as (12.12). [Pg.1031]

Caio(P04)6F2 2Si02 4Na2C03 6CaNaP04 -1- 2Ca2Si04 -1- 2NaF -1- dCOj (12.12) [Pg.1031]

NPK Content of Typical Waste Product Fertilisers (% of Dry Weight) [Pg.1032]


See other pages where Insoluble Slow-Acting Fertilisers is mentioned: [Pg.1031]    [Pg.1031]   


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