Preparation technology and properties analysis of biochar-based microbial fertilizers

doi:10.3969/j.issn.1004-1524.2018.07.16

›› 2018, Vol. 30 ›› Issue (7): 1218-1228.DOI: 10.3969/j.issn.1004-1524.2018.07.16

• Environmental Science • Previous Articles Next Articles

Preparation technology and properties analysis of biochar-based microbial fertilizers

SUO Guifang^{1, 2}, LYU Haohao^{2, 3}, WANG Yuying^{2, 3}, LIU Yuxue^{2, 3}, HE Lili^{2, 3}, YANG Shengmao^{1, 2, 3, *}

1. College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, China;
2. Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China;
3. Engineering Research Center of Biochar of Zhejiang Province, Hangzhou 310021, China

Received:2017-11-09 Online:2018-07-20 Published:2018-08-02

Abstract

Abstract: In the present study, the rice husk biochar, NPK fertilizer, and Bacillus subtilis spores were prepared for the development of new biochar-based microbial fertilizers, by using three manufacture technologies including the mixed method, adsorption method and mixed granulation method. The content of rice husk biochar was set as 10%, 20%, 30%, respectively. The properties of these biochar-based microbial fertilizers, including the pH value, the total nutrients content, the elemental contents, the number of living bacteria, and nutrient release characteristics were determined. It was shown that biochar-based microbial fertilizer prepared with mixed granulation method had the best ability to absorb the NPK fertilizer and microbial spores, and was followed by those prepared by the adsorption method and the mixed method. The elements contents of 9 biochar-based microbial fertilizer samples were rich. The content of C and N increased while the content of H decreased with the increase of the addition amount of rice husk biochar under the same preparation condition. The pH value of the 9 biochar-based microbial fertilizer samples were acid or close to neutral, and the total nutrients contents met the requirement of the national standard for compound fertilizer. The number of living bacteria was 3.4×10⁵-7.0×10⁵ g^-1 after the spores of Bacillus subtilis were compounded with rice husk biochar and NPK fertilizer for 60 days. Under the same process conditions, the number of living bacteria of biochar-based microbial fertilizers increased with the increase of the addition amount of rice husk biochar. The seven days nitrogen accumulated water dissolution experiments showed that the 9 biochar-based microbial fertilizer samples had certain slow release function. The nitrogen release rate of biochar-based microbial fertilizers with the same preparation technology decreased with the increase of the addition amount of rice husk biochar. With the same content of rice husk biochar, mixed granulation method had the best slow release characteristics, and was followed by the adsorption method and the mixed method. Therefore, the biochar-based microbial fertilizer with 30% rice husk biochar made by mixed granulation method had optimal property, and the effect should be further verified by pot or field experiment and to promote its application in small scale.

Key words: biochar, Bacillus subtilis, fertilizers development

CLC Number:

S144
S145.6

SUO Guifang, LYU Haohao, WANG Yuying, LIU Yuxue, HE Lili, YANG Shengmao. Preparation technology and properties analysis of biochar-based microbial fertilizers[J]. , 2018, 30(7): 1218-1228.

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