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Three-year tobacco potassium absorption responses to paddy soil properties amended with biochar

Three-year tobacco potassium absorption responses to paddy s...

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2019年中国作物学会学术年会

作者： Yi-Yang Zhang 帅京彤 Shen-He Su Peng-Fei Xie Xiao-Dong Pei Qiang Li Agronomy College Hunan Agriculture University Changsha Tobacco Company of Hunan Tobacco Company

Introduction: As one of the three basic elements of crop growth and development, potassium(K) has an impact on the physical, chemical and biological characteristics of tobacco. The soil of China is poor in K and the K mineral resources are relatively poor. K deficiency in farmland soils has become a common problem limiting crop yields in China. At present, biochar(BC) as a soil amendment and slow-release carrier of fertilizer has attracted much attention in agricultural production. Therefore, the purpose of this study was to study the effects of BC application on K uptake in tobacco under soil microbial and chemical environments through pot experiments. Material and Methods: A 3-year pot experiment was used to verify the connection between tobacco K accumulation and soil chemical properties along with soil enzyme activities for biochar addition. BC was added once into the soil at four rates of 0%, 5%, 10% and 15%(dry biochar weight/wet soil weight) — preliminary the characteristics of K release and transformation in paddy soil under different BC amount. Results: Compared to K accumulation value(KAV) from the control treatment(CK) with no BC, it improved KAV by 12.1–16.6% in the 10–15% BC treatments in the first year. Next year, it increased KAV by 17.4–49.8% in the BC treatments and by 13.4–53.5% in the last year. In 2016, higher amounts of BC decreased soil enzyme activities, including invertase and catalase. After that, they tended to be varied same, increasing invertase activity by 0.1–12.3% and catalase activity by 0.5–15.1% annually following the BC compared with CK. BC increased soil available potassium(AK) by 14.1–25.8%, 15.2–64.8% and 9.5–61.6% for three consecutive years. Conclusions: The importance of BC for KAV and the major issue of K leaching are increasingly focusing attention on BC application, pointing towards the need for a more consistent approach to the use of BC across the tobacco-planting soil.

关键词： flue-cured tobacco biochar soil available potassium soil enzyme activity potassium accumulation value potassium recovery efficiency

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