Effects of Different Fertilizing Treatments on Microbial Biomass and Enzyme Activities of Peanut Continuous Cropping Soil
In order to understand the long-term effects of organic and inorganic fertilizers on sandy soil quanlity, we conducted a study on peanut to determine the effects of organic matter and inorganic NPK on soil microbial biomass,soil enzyme activity, and soil fertility in the upland sandy soil, a more than five yearsˊ long-term fertilization experiment (since 2009). The treatments included no fertilization(CK), N, NP, NPK, M (organic fertilizer), M+N, M+NP,M+NPK. The results showed that the soil microbial biomass carbon (SMB-C),microbial biomass nitrogen (SMB-N), the activity of urease, phosphatase and invertase of the treatments with organic matter were significant higher than those of inorganic fertilizer treatments,with the MNPK treatment having the biggest increase than CK treatment,the increase of SMB-C, SMB-N, urease, phosphatase,and invertase was by 104.1%,201.2%, 68.9%,34.2% and 57.5%, respectively. Urease, phosphatase and invertase activities were significantly and positively correlated with soil organic carbon, total nitrogen, available N, available P and available K. Long term application of organic matter or co-application of organic matter and mineral fertilizers not only increases the soil microbial biomass, but also enhances soil enzymes, thus can improve sandy soil sustainable productivity.
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