›› 2019, Vol. 31 ›› Issue (5): 798-805.DOI: 10.3969/j.issn.1004-1524.2019.05.16

• Environmental Science • Previous Articles     Next Articles

Optimization of straw decomposition with inoculants by using response surface method

SU Yao1, JIA Shengqiang1,2, HE Zhenchao1, YANG Yanhua1,2, YU Man1, CHEN Xijing1, SHEN Alin1,*   

  1. 1. Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China;
    2. College of Environment and Resources, Zhejiang A&F University, Hangzhou 311300, China;
  • Received:2019-01-30 Online:2019-05-25 Published:2019-05-23

Abstract: The rice straw was selected as typical straw to illustrate the influence of 4 straw-decomposing inoculants on the decomposition of straws. Based on the decomposition rate and ratio of carbon to nitrogen of rice straw, one inoculant with better straw decomposing capacity was selected for optimization of straw decomposing conditions by Box-Behnken design. The result demonstrated that among the four factors, namely, straw-decomposing inoculant content, temperature, water content and extra-nitrogen (biogas slurry) content, the effect of temperature, water content and straw-decomposing inoculant content on decomposition rate reached the significant level of P<0.01. The predicted optimum conditions for straw decomposing were temperature of 29.6 ℃, water contents of 90%, straw-decomposing inoculant content of 2.0% of the straw weight, and extra-nitrogen content of 0.17% of straw weight. According to the mathematical model, the maximum decomposition rate on 25th day was 63.25%, and it was consistent with the decomposition rate revealed by verification experiment under the above conditions.

Key words: rice straw, straw-decomposing inoculants, Box-Behnken design

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