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The effect of Mg supplement on the composting of swine manure and the formation of MgNH4PO46H2O (MAP) crystal during composting were examined. Mg source was added at a rate of 1.2 molar ratios to soluble phosphate (PO4) level in swine manure. The temperature profiles and final compost qualities revealed that the Mg source addition didn't retard the decomposition of organic matters. As the added Mg reacted with NH4 and PO4 in manure, creating MAP crystal, the NH4 level was reduced, and this was resulted in low nitrogen lose during the composting. The phosphate level was also decreased with the addition of Mg source, and hence the ratio of orthophosphate to total phosphate (OP/TP) in the final compost was lowered. Therefore, it was assured that supplement of Mg source into the composting materials could enhance the quality of compost by preserving nourishment and converting it into a slowly releasing fertilizer. X-Ray diffraction examination of the final compost showed that a distinct MAP crystal was formed during the composting, and the crystal mainly existed with the compost particle size less than 2.8 mm and over 2/3 of nourishment of the final compost was found in those particles. (Key words : Swine manure, Composting, MAP, Slowly releasing fertilizer)

Changes of Compost Quality by the Formation of Struvite Crystal During the Composting of Swine Manure