LI Rong-hua1, TU Zhi-neng1, Ali Amjad1, JIN Xin-di2, LI Song-ling3, ZHAO Xu-bo2
1. College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China; 2. College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China; 3. Qinghai Academy of Agricultural and Forestry Sciences, Qinghai University, Xining 810016, China
Abstract：In order to reduce nitrogen loss and increase phosphorus availability, a set of manure composting experiments, control treatment (CK), biochar (B), microbial solution (M), and biochar combined with microbial solution (BM), were conducted to study their effects on compost maturity and N and P conservation. The results showed that all four treatments satisfied the required sanitation standards of the manure compost. The accumulated emission amount of NH3 and N2O in treatment BM were 2.36 and 0.93g, respectively, which were significantly lower than that in CK (8.01 and 1.31g). In addition, the total N content was 23.78g/kg in treatment BM, which was significantly higher than that in CK (18.36g/kg). The TP contents in treatments of CK, B, M, and BM at the end of composting were 16.41, 17.16, 18.51, and 19.16g/kg, respectively. Moreover, the OP content was increased by 77.60% in BM, which was significantly higher than that in CK (50.66%). After composting, the P availability increased especially for the treatments of M and BM, and the sequence of the total proportion of moderately available P and easily available P was in the order of: BM (42.94%) > M (39.80%) > B (37.29%) > CK (31.51%). This study showed biochar combined with microbial solution additions could have great effects on improving compost maturity, N and P conservation.
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