Study on the nitrogen-releasing characteristics and mechanism of biochar-based urea infiltration fertilizer

In this study, the nitrogen-releasing characteristics and mechanism of the biochar-based urea infiltration fertilizer (BUF) were investigated. The crushing resistance of BUF increased with the increased proportion of urea-biochar, which at maximum reached 502.93 ± 6.47 N. BUF had the excellent slow-...

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Bibliographic Details
Published in:Biomass conversion and biorefinery 2023-07, Vol.13 (11), p.9795-9805
Main Authors: Wang, Mingfeng, Xiang, Aihua, Gao, Zhennan, Zhang, Ke, Ren, Yongzhi, Hu, Zhifeng
Format: Article
Language:English
Subjects:
Biotechnology
Chemical bonds
Compressive strength
Crop yield
Energy
Fertilizers
Hydrogen bonds
Infiltration
Intermolecular forces
Leaching
Nitrogen
Original Article
Renewable and Green Energy
Soil improvement
Ureas
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Summary:In this study, the nitrogen-releasing characteristics and mechanism of the biochar-based urea infiltration fertilizer (BUF) were investigated. The crushing resistance of BUF increased with the increased proportion of urea-biochar, which at maximum reached 502.93 ± 6.47 N. BUF had the excellent slow-release performance. Urea was completely released after third leaching, while the urea in BUF 1-2 was not completely released after tenth leaching. The release process of BUF 1-2 is divided into three stages, which corresponded to the release of P-urea (dispersed on the biochar surface without physic force and chemical bonds), F-urea (connected with biochar through intermolecular forces, hydrogen bonds, etc.), and C-urea (connected with biochar through chemical bonds) in BUF 1-2 . The release rate of P-urea, F-urea, and C-urea decreased gradually. Moreover, the physicochemical performances of biochar and Re biochar were similar, although their apparent morphologies were different. The pores of biochar filled with urea collapsed in the nitrogen-release process, reducing the number of pores on Re-biochar surface. As a new type of biochar-based fertilizer, its effects on soil improvement, crop yield increase, and fertilization methods still need to be further studied.
ISSN:2190-6815
2190-6823
DOI:10.1007/s13399-021-01848-5