Effect of Two Different Magnesium Salt on Nitrogen Fixing in High-temperature Phase of Cattle Manure Composting

doi:10.11924/j.issn.1000-6850.casb16120053

Abstract

Abstract: The authors applied the constant temperature incubator to simulate the composting high temperature stage with MgSO4, KH2PO4 and magnesium slag addition. The nitrogen protect effect of each component in magnesium ammonium phosphate (MAP) and magnesium slag as the feasibility of nitrogen fixing agent in composting process was studied. The results showed that magnesium fixing agent addition significantly reduced the pile pH value and decreased nitrogen loss. Addition of MgSO4 and KH2PO4 at the same time could bring the best nitrogen protect effect. There was no significant difference between MgSO4 and magnesium slag addition with the same rate. Nitrogen protection efficiency was positively related with magnesium slag addition amount, the nitrogen protection efficiency of magnesium slag addition amount 2%, 4% and 8% was 6.15%, 10.13% and 19.51%, respectively. Magnesium materials addition could increase EC value and reduce the GI value. All the trials could achieve maturity, indicating that magnesium materials could be used as nitrogen fixing agent in composting and magnesium slag had application prospects because of low price.

张发宝,李苹 and 付弘婷. Effect of Two Different Magnesium Salt on Nitrogen Fixing in High-temperature Phase of Cattle Manure Composting[J]. Chinese Agricultural Science Bulletin, 2017, 33(27): 19-25.

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