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| Effects of rice straw biochar addition on the phosphorus bioavailability in reddish paddy soil |
| Received:November 02, 2023 |
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| KeyWord:rice straw biochar;reddish paddy soil;potted experiment;rice（Oryza sativa）;bioavailability of phosphorus |
| Author Name | Affiliation | E-mail | | MA Changlin | School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | GAO Bohan | School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | WANG Yanling | School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | ylwang@nuist.edu.cn |
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| Abstract: |
| This study was conducted to clarify the effect of rice straw biochar addition on the bioavailability of phosphorus（P）components in reddish paddy soil. Based on a rice plant pot experiment, a simulated biologically-activated P analysis method（BBP method）was used. The study analyzed the differences in the changes of soluble P（CaCl2-P）, P easily released by organic acid activation（Citrate-P）, organic P easily mineralized by phosphatase（Enzyme-P）, mineral-bound P（HCl-P）, total P（TP）, available P（Bray-P）, and P activation coefficient（PAC）in paddy soils at different growth stages of rice under the following conditions：no biochar application（CK）, one-year biochar application（B1）, and two-year consecutive biochar application（B2）. The results showed that：compared to CK, there were no significant changes in TP, Bray-P, and BBP components in the paddy soil under B1 treatment. In the B2 treatment, the content of TP, BrayP, Citrate-P, and HCl-P in the paddy soil significantly increased, while CaCl2-P and Enzyme-P content showed no significant changes. As the rice growth stage extended, HCl-P/TP increased significantly in all treatments. Under B2 treatment, CaCl2-P/TP and Enzyme-P/TP both increased significantly. Correlation analysis showed Bray-P and TP in paddy soil were significantly positively correlated with soil pH after biochar addition. CaCl2-P was significantly positively correlated with HCl-P, TP, and negatively correlated with soil available iron. |
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