Biochar-coupled organic fertilizer reduced soil water-dispersible colloidal phosphorus contents in agricultural fields

Junwei Jin; Sangar Khan; Kamel Mohamed Eltohamy; Shuang He; Chunlong Liu; Fayong Li; Xinqiang Liang

doi:10.1016/j.chemosphere.2023.138963

Biochar-coupled organic fertilizer reduced soil water-dispersible colloidal phosphorus contents in agricultural fields

Chemosphere. 2023 Aug:333:138963. doi: 10.1016/j.chemosphere.2023.138963. Epub 2023 May 16.

Authors

Junwei Jin¹, Sangar Khan², Kamel Mohamed Eltohamy³, Shuang He¹, Chunlong Liu⁴, Fayong Li⁵, Xinqiang Liang⁶

Affiliations

¹ Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental and Resources Sciences, Zhejiang University, Hangzhou, 310058, PR China.
² Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental and Resources Sciences, Zhejiang University, Hangzhou, 310058, PR China; Department of Geography and Spatial Information Techniques, Ningbo University, Ningbo, 315211, PR China.
³ Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental and Resources Sciences, Zhejiang University, Hangzhou, 310058, PR China; Department of Water Relations & Field Irrigation, National Research Centre, Dokki, Cairo, 12622, Egypt.
⁴ Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin, 130102, PR China.
⁵ College of Water Resources and Architectural Engineering, Tarim University, Xinjiang, 843300, PR China.
⁶ Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental and Resources Sciences, Zhejiang University, Hangzhou, 310058, PR China; Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin, 130102, PR China. Electronic address: liang410@zju.edu.cn.

PMID: 37201601
DOI: 10.1016/j.chemosphere.2023.138963

Abstract

Soil water-dispersible colloidal phosphorus (WCP) presents high mobility, however, the regulatory effect of biochar-coupled organic fertilizer is rarely known, especially under different cropping patterns. This study investigated the P adsorption, soil aggregate stability, and WCP in three paddy and three vegetable fields. These soils were amended with different fertilizers (chemical fertilizer, CF; substitution of solid-sheep manure or liquid-biogas slurry organic fertilizer, SOF/LOF; substitution of biochar-coupled organic fertilizers, BSOF/BLOF). Results presented that the LOF averagely increased the WCP contents by 50.2% across the sites, but the SOF and BSOF/BLOF averagely decreased their contents by 38.5% and 50.7% in comparison with the CF. The WCP decline in the BSOF/BLOF-amended soils was mainly attributed to the intensive P adsorption capacity and soil aggregate stability. The BSOF/BLOF increased the amorphous Fe and Al contents in the fields in comparison with the CF, which improved the adsorption capacity of soil particles, further improving the maximum absorbed P (Q_max) and reducing the dissolved organic matter (DOC), leading to the improvement of > 2 mm water-stable aggregate (WSA_>2mm) and subsequent WCP decrease. This was proved by the remarkable negative associations between the WCP and Q_max (R² = 0.78, p < 0.01) and WSA_>2mm (R² = 0.74, p < 0.01). This study manifests that biochar-coupled organic fertilizer could effectively reduce soil WCP content via the improvement of P adsorption and aggregate stability.

Keywords: Amorphous Fe and Al; Biochar; P adsorption capacity; Soil aggregate stability; Water-dispersible colloidal phosphorus.

MeSH terms

Animals
Charcoal / chemistry
Fertilizers
Phosphorus* / chemistry
Sheep
Soil* / chemistry
Water

Substances

biochar
Soil
Phosphorus
Fertilizers
Water
Charcoal