Effects of Rice Husk Biochar on Nitrogen Conversion and Fixation in Sheep Manure Composting

doi:10.11924/j.issn.1000-6850.casb2021-0894

Abstract

Abstract:

To study the conversion and fixation of nitrogen in the process of using rice husk biochar in sheep manure composting, we used sheep manure, edible mushroom residue and rice husk biochar pyrolyzed at 450℃ and 650℃ as raw materials, monitored the total ammonia volatilization and different forms of nitrogen content in compost by outdoor aerobic composting method. The water-soluble total nitrogen content and ammonium nitrogen content of the extracted samples after being adsorbed and desorbed by rice husk biochar were determined and analyzed by indoor adsorption and desorption method. The results showed that compared with those of CK, the ammonia volatilization accumulative amount of treatment BC450 and BC650 decreased by 68.99% and 75.09%, respectively, and the nitrogen retention rate increased by 26.2% and 33.1%, respectively, and the treatments reduced the water-soluble total nitrogen, ammonium nitrogen and humus nitrogen of the compost body, and increased the microbial biomass nitrogen of the compost body. The effect of treatment BC650 was stronger than that of treatment BC450. After the extraction of rice husk biochar with the same nitrogen content, the total nitrogen content in the nitrogen carriers treated by BC450 and BC650 was decreased by 21.79% and 28.6%, respectively, and the ammonium nitrogen content was decreased by 13.68% and 32.45%, respectively, compared with those before adsorption. After the desorption by rice husk biochar, the contents of total nitrogen and ammonium nitrogen in the desorption solution treated by BC650 were significantly higher than those treated by BC450. In the composting process, the physical adsorption and chemical adsorption of nitrogen by biochar coexist, and the adsorbed nitrogen fails to improve the humic nitrogen content of compost and has reversible desorption property. The biochar pyrolyzed at 650℃ has stronger reversibility than that pyrolyzed at 450℃.

Key words: sheep manure, compost, biochar, nitrogen, conversion, fixation

CLC Number:

S141.4

WANG Haihou, CHENG Yueqin, JIN Meijuan, LIU Zekai, SHI Linlin, LU Changying. Effects of Rice Husk Biochar on Nitrogen Conversion and Fixation in Sheep Manure Composting[J]. Chinese Agricultural Science Bulletin, 2022, 38(27): 51-59.

Figures/Tables 7

References 24

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