Abstract
The effects of biogas slurry on the solubilization of low-grade rock phosphate was studied by digestion in compost pits. Biogas slurry had solubilizing power for up to 60 days while molasses addition prolonged it throughout a digestion period of 120 days. In this case solubilization reached a maximum of 42.6% of added rock phosphate. Pyrite incorporation depressed drastically the rate of solubilization in spite of decreasing the pH and increasing the citrate-soluble P of the digesting biogas slurry. The concentration of total P increased with increase the loss of organic matter during digestion. The maximum weight loss was recorded in rock phosphate-containing treatment, where release of water-soluble P increased continuously with time and organic P decreased after 30 days of incubation. On the other hand, incorporation of molasses both in presence and absence of pyrite, decreased the water-soluble P but increased the organic P content of the digesting material.
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