Effects of Straw Degrading Bacteria on Straw Degradation Rate, Soil Physicochemical Properties and Enzyme Activities

doi:10.7668/hbnxb.20190347

Abstract

Abstract: In order to solve the problem that straw is difficult to be degraded in low temperature areas in North China, this study applied straw degradation bacteria agent to rapidly decompose straw, which plays an effective role in utilizing straw resources and improving soil fertility. The effects of three different straw degrading bacteria on the degradation effect of corn straw in different culture stages, soil physical and chemical properties and enzyme activities were compared by simulating the cultivation experiment of straw returning to the field and indoor analysis. The results showed that the addition of degrading bacteria could accelerate the degradation of straw, especially the treatment with mixed bacteria agent. The degradation rate reached 86% after 100 days of culture, which was significantly higher than that of aseptic treatment.At the same time, the application of straw degrading bacteria significantly increased the soil enzyme activity, of which the increase of urease activity was the most obvious. At the end of the culture period, the urease activity of soil treated with low temperature bacteria agent, normal temperature bacteria agent and mixed bacteria agent was 1.2, 1.3 and 1.7 times that of the initial culture period.With the prolonging of culture time, the activities of catalase, invertase, acid phosphatase and cellulase all improved to different degrees, and the enzyme activities of each treatment were significantly higher than those of CK and S;The contents and pH values of soil alkali-hydrolyzed nitrogen, available phosphorus, organic matter, available potassium, nitrate nitrogen and ammonium nitrogen in each treatment showed a stable upward trend with the increase of culture days. Therefore, the degradation rate of corn straw, soil physical and chemical properties and enzyme activities can be significantly improved by straw mulching and application of degradation bacteria at low temperature.

Key words: Straw returned, Black soil, Soil nutrients, Soil enzyme activity, Straw degrading bacteria

CLC Number:

S141.4

CHANG Hongyan, WANG Tianye, HUANG Ziyuan, BAI Yichen, WANG Chengyu, LIU Shuxia. Effects of Straw Degrading Bacteria on Straw Degradation Rate, Soil Physicochemical Properties and Enzyme Activities[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2019, 34(S1): 161-167. doi: 10.7668/hbnxb.20190347.

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