Improved phosphorus availability and reduced degree of phosphorus saturation by biochar-blended organic fertilizer addition to agricultural field soils. (March 2023)

• Record Type: Journal Article
• Authors: Jin, Junwei; Fang, Yunying; He, Shuang; Liu, Yu; Liu, Chunlong; Li, Fayong; Khan, Sangar; Eltohamy, Kamel Mohamed; Liu, Boyi; Liang, Xinqiang
• Is Part Of: Chemosphere. Volume 317(2023)
• Publication Date: 2023-03
• Subjects: Soil phosphorus species -- Sequential chemical fractionation -- 31P NMR -- Degree of phosphorus saturation -- Phosphorus loss; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2023.137809
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Phosphorus (P) availability and loss risk are linked to P species; however, their alternations in the soil amended with biochar-blended organic fertilizer is not well known, particularly under contrasting soil properties and land management. In this study, the variance of soil P species extracted by sequential chemical extraction (SCE) and 31 P NMR techniques, as well as the degree of P saturation (DPS), were investigated throughout three paddy and three vegetable fields. These fields were amended with three different fertilizers at the same P application rate: chemical fertilizer (CF), organic fertilizer substitution (sheep manure/biogas slurry, SM/BS), and biochar-blended organic fertilizer substitution (BSM/BBS). Results showed that the BSM/BBS and SM increased the total P contents by 7.5% and 5.9% (TP) and available P contents by 30.1% and 19.2% (AP), but decreased the DPS values by 19.4% and 11.7%, compared to the CF treatment. Yet, the BS decreased the TP and AP contents but increased the DPS values across the experimental sites. In the BSM/BBS amended soils, high AP contents were due to the increased inorganic P (NaHCO3 -Pi ), while the increased organic P (monoester and DNA) induced low DPS values and reduced soil P loss risk. Our study highlights that biochar-blended organic fertilizer is an effective agronomic way for improving P availability and decreasing P loss risk via the alteration of soil P species. Graphical abstract: Image 1 Highlights: High proportion of organic P and low P loss risk in the paddy fields. Biochar addition increased stable P dissolution and organic P retention. Biochar addition improved soil P availability and retention.