Impact of Different Organic Fertilizers on Soil Humus, Microbiomass and Quality of Cabbage

摘要

A field experiment was conducted to determine effects of 6 treatments including without fertilization (CK), conventional fertilization (CM), corn straw plus manure (SM), peat plus chicken manure( PM), mushroom residue plus chicken manure (MM) and high level of chicken manure (HM) on different soil active organic carbon and carbon pool management index. The results showed that fertilization of chicken manure is difficult to prompt activation of soil that contains plenty of fulvic acid, but combined application of different organic fertilizers not only can significantly increase the soil organic matter content, also can balance the proportion between the components of soil humus, improve Hu/Fu. Compared to CK treatment after fertilization, there was a narrow range in HA/TOC, FA/TOC, HM/TOC of HM treatment that was only 4%-8%, but variations of 12%-25% was produced by SM, PM, MM treatment, and its Hu/Fu increased 98% - 292% compared with HM treatment;;The quantity of soil microorganisms is enhanced mostly by the treatment of HM, and the increase of bacteria and fungi was the maximum, but the quantity of actinomycetes was increased mostly by MM treatment;;high level of chicken manure treatment can increase the risk of nitrate accumulation, but combined application of different organic fertilizers can significantly reduce the nitrate accumulation of vegetables, improving the quality of vegetables. Compared with HM treatment, MM treatment reduces the nitrate content of 45%. Therefore, the results demonstrated that paid attention to the selection of organic fertilizers and its combined application not only would achieve better fertilizing effect, also would better improve the quality of vegetables in organic agricultural production.