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Agronomy
Volume 15
Issue 6
10.3390/agronomy15061357
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Effects of Three Years of Biochar Application on Soil Organic Nitrogen Fraction in Tropical Soil

by
Longwei Meng
1,2,3,†,
Chunlan Jiang
2,3,†,
Meirong Huang
2,
Qiqian Lu
1,2,
Yunxing Wan
1,2,
Anfu Yang
3,
Shuirong Tang
1,
Yanzheng Wu
2,
Xiaoqian Dan
2,
Qilin Zhu
1,*,
Lei Meng
1,
Ahmed S. Elrys
2 and
Jinbo Zhang
1
1
School of Breeding and Multiplication (Sanya Institute of Breeding and Multiplication), Hainan University, Sanya 572025, China
2
School of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China
3
Hainan Research Academy of Environmental Sciences, Haikou 571100, China
*
Author to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Agronomy 2025, 15(6), 1357; https://doi.org/10.3390/agronomy15061357
Submission received: 6 April 2025 / Revised: 29 May 2025 / Accepted: 30 May 2025 / Published: 31 May 2025
(This article belongs to the Special Issue Advances in Application Effects and Mechanisms of Fertilizer Products)
Versions Notes

Abstract

Biochar application can increase soil carbon (C) and nitrogen (N) storage. However, the short- and long-term effects of biochar application on soil organic N fractions remain poorly understood in tropical areas. Hence, an in situ combined laboratory incubation study was investigated to determine changes in soil organic N fractions and related chemical biological properties under 1 month (BF) and 3 years (BA) of different biochar application rates (1% and 2%). The results showed that biochar application significantly increased the hydrolysable ammonium N (HAN) by 8.67–18.90% (BF) and 9.45–17.32% (BA). Amino acid N (AAN) significantly increased by 6.08–12.90% (BF) and 5.32–12.16% (BA) compared to CK. The hydrolysable unknown N decreased significantly in BF. The HAN and AAN under the higher biochar application rate were significantly higher than those under the lower application rate. Total N, HAN, and AAN contents were positively correlated with MBN. The structural equation model results showed that soil pH directly promoted AAN, and indirectly promoted soil MBC and MBN. Our results implied that the 3-year biochar application had a more stable effect on the organic N fraction. Therefore, it is possible to increase and maintain soil organic N fractions by appropriate amounts of long-term biochar application in tropical areas.
Keywords: biochar; soil total nitrogen; active nitrogen fractions; soil extracellular enzymes biochar; soil total nitrogen; active nitrogen fractions; soil extracellular enzymes

Share and Cite

MDPI and ACS Style

Meng, L.; Jiang, C.; Huang, M.; Lu, Q.; Wan, Y.; Yang, A.; Tang, S.; Wu, Y.; Dan, X.; Zhu, Q.; et al. Effects of Three Years of Biochar Application on Soil Organic Nitrogen Fraction in Tropical Soil. Agronomy 2025, 15, 1357. https://doi.org/10.3390/agronomy15061357

AMA Style

Meng L, Jiang C, Huang M, Lu Q, Wan Y, Yang A, Tang S, Wu Y, Dan X, Zhu Q, et al. Effects of Three Years of Biochar Application on Soil Organic Nitrogen Fraction in Tropical Soil. Agronomy. 2025; 15(6):1357. https://doi.org/10.3390/agronomy15061357

Chicago/Turabian Style

Meng, Longwei, Chunlan Jiang, Meirong Huang, Qiqian Lu, Yunxing Wan, Anfu Yang, Shuirong Tang, Yanzheng Wu, Xiaoqian Dan, Qilin Zhu, and et al. 2025. "Effects of Three Years of Biochar Application on Soil Organic Nitrogen Fraction in Tropical Soil" Agronomy 15, no. 6: 1357. https://doi.org/10.3390/agronomy15061357

APA Style

Meng, L., Jiang, C., Huang, M., Lu, Q., Wan, Y., Yang, A., Tang, S., Wu, Y., Dan, X., Zhu, Q., Meng, L., Elrys, A. S., & Zhang, J. (2025). Effects of Three Years of Biochar Application on Soil Organic Nitrogen Fraction in Tropical Soil. Agronomy, 15(6), 1357. https://doi.org/10.3390/agronomy15061357

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