| Effects of long\|term application of straw biochar on soil nutrient and crop growth |
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| DOI：10.7606/j.issn.1000-7601.2024.02.08 |
| Key Words: straw biochar long term application soil nutrient content crop nutrient absorption crop yield |
| Author Name | Affiliation | | YANG Li | Organizational and Personnel Department, Shanxi Agricultural University, Taiyuan, Shanxi 030031, China | | WANG Jinsong | College of Resources and Environment, Shanxi Agricultural University, Taiyuan, Shanxi 030031, China | | DONG Erwei | College of Resources and Environment, Shanxi Agricultural University, Taiyuan, Shanxi 030031, China | | LIU Qiuxia | College of Resources and Environment, Shanxi Agricultural University, Taiyuan, Shanxi 030031, China |
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| Abstract: |
| Long\|term field experiments were carried out from 2011 to 2020 with four treatments of without fertilizer (CK), without fertilizer plus biochar only (CK+B), nitrogen, phosphorus, and potassium fertilizer (NPK), and NPK fertilizer plus biochar (NPK+B). Maize and sorghum were rotated. This experiment was conducted to study the influences of organic carbon continuous application with 5 years and 10 years on soil organic matter, total N, available P and available K contant, as well as soil sucrase, urease, alkaline phosphatase, and catalase enzyme activities in 0~20 cm soil layer, along with changes in biomass, nutrient accumulation and yield. The result showed that: (1) Compared with CK, CK+B enhanced soil organic matter by 46.3% and 61.2% after biochar applying 5 and 10 years, respectively; meanwhile they were increased by 67.8% and 77.7% induced by NPK+B relative to NPK, respectively. 10-year biochar application resulted in a higher soil total N content when fertilizer was withdrawn, whereas no difference was noticed under conditions of fertilization. Soil available K contents were enhanced significantly by 86.4% and 46.6% for CK+B and NPK+B, compared with CK and NPK, respectively. (2) Biochar applying continuous for 10 years significantly increased the activities of sucrase by 11.4%~11.9% and alkaline phosphatase by 7.9%~16.2%, but had no effect on soil urease, catalase, and available P. (3) The positive effect of biochar on accumulative P and K uptake both at heading and maturity was observed, but there was no effect on N accumulative uptake at the maturity after 10-year’s application. Biochar did not enhance grain yield irrespective fertilization treatment. Obviously, long\|term application of straw biochar promoted soil organic matter and soil available K significantly whereas there were relative low influences on soil total N and available P. Biochar application improved the uptake both P and K. Therefore, when biochar was applied, N should be supplied to maintain crop growth, and decrease K dose. |
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