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- Title
Synergistic effects of rice straw and its biochar on availability of phosphorus fertiliser in acidic soils.
- Authors
Baquy, M. Abdulaha-Al; Pan, Xiao-ying; Li, Jiu-yu; Hong, Zhi-neng; Kamran, Muhammad Aqeel; Xu, Ren-kou
- Abstract
Contexts: Increasing the availability of phosphorus fertiliser is needed for better crop production in acidic soils. Aims: To observe how rice straw and its biochar affect phosphorus fertiliser recovery in an Ultisol and an Oxisol as a measure for the availability of phosphorus in acidic soils. Methods: A 60-day incubation study was conducted using treatments comprising of straw (1.5%, w/w) and biochar produced at 400°C (1.5%, w/w), a mixture of each at the same rate, and a control with two phosphorus rates of 0 and 100 mg kg−1. Key results: The application of both the straw and the biochar alone and in combination raised the soil pH by 0.12, 0.20, 0.32, 0.17, 0.31 and 0.38 units, and cation exchange capacity by 2.06, 3.02, 2.72, 2.56, 6.28, and 8.40% compared to control for both the Ultisol and the Oxisol, respectively. Similarly, dissolved organic matter also increased by 74.19, 55.28, 84.63, 24.39 and 136.44%, respectively compared to control for the corresponding treatments and soils except the straw amended Ultisol. With an increase in the soil pH, the rate of phosphorus recovery increased by 11.73, 12.99, 23.89, 2.72, 5.23 and 6.28% compared to control for the corresponding treatments and soils, respectively. Phosphate adsorption by the soils became hindered by increased cation exchange capacity and dissolved organic matter but decreased exchangeable trivalent aluminium cations, which led to a greater phosphorus recovery in both the amended soils. Conclusions: The combined application of rice straw and biochar would be the appropriate choice for increasing the applied phosphorus fertiliser availability in acid soils. Fixation of phosphorus is harmful for crop production due to the lower availability of phosphorus, which is greatly affected by the presence of iron and aluminium content in Ultisol and Oxisol. The phosphorus availability is mainly dependent on soil pH, cation exchange capacity, dissolved organic matter, and divalent cations of calcium and magnesium. The combined application of rice straw and its biochar would be a cost-effective approach in increasing phosphorus availability due to changes in the soil mentioned above.
- Subjects
RICE straw; ACID soils; BIOCHAR; FERTILIZERS; PHOSPHORUS; PHOSPHORUS in soils
- Publication
Crop & Pasture Science, 2022, Vol 73, Issue 12, p1334
- ISSN
1836-0947
- Publication type
Article
- DOI
10.1071/CP21800