Effects of Combined Applications of Biogas Slurry and Biochar on Phosphorus Leaching and Fractionations in Lateritic Soil

Diverse soil phosphorus (P)-leaching phenomena induced by environmental disturbance have gained increasing attention. Two kinds of typical organic materials, biochar and biogas slurry, (BS) are widely utilized to amend agricultural soil, but there is little research that gives insight into their co-...

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Bibliographic Details
Published inSustainability Vol. 14; no. 13; p. 7924
Main Authors Zhang, Bangxi, Yin, Rongxiu, Wei, Quanquan, Qin, Song, Peng, Yutao, Zhang, Baige
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.07.2022
Subjects
Adsorption
Agricultural land
Biogas
Carbon
Cations
Charcoal
Experiments
Fertilizers
Fractions
Laboratories
Leachates
Leaching
Nitrogen
Organic materials
Phosphorus
Polyethylene
Potassium
Rice
Slurries
Soil chemistry
Soil management
Soil pH
Soils
Sustainability
China
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Summary:Diverse soil phosphorus (P)-leaching phenomena induced by environmental disturbance have gained increasing attention. Two kinds of typical organic materials, biochar and biogas slurry, (BS) are widely utilized to amend agricultural soil, but there is little research that gives insight into their co-effects on soil P-leaching and corresponding mechanisms. Herein, a total of six treatments (viz., control, 2% (w/w) biochar, low ratio BS with or without 2% (w/w) biochar, high ratio BS with or without 2% (w/w) biochar) were conducted to investigate the P-leaching and fraction transformation mechanisms. The column experiment results showed that compared to control, sole BS application or biochar both can slightly enhance the soil-P loss by 134.8% and 39.8%. High ratios of BS induced higher P loss than the low ratios of BS by 125.1%. In comparison with the sole BS treatment, combined BS and biochar application increase P loss but result in less soil leaching of basic cations. The incubation experiment results showed that the enhanced P-leaching in combined BS and biochar treatment is probably attributable to the enhanced soil pH, decreased DPS, soil P adsorption capacity, and transformation of moderately labile Fe–P into labile P. This research helps in understanding the abiotic process of biochar and BS in promoting soil P-leaching and soil-P management using biochar and biogas slurry.
ISSN:2071-1050
2071-1050
DOI:10.3390/su14137924