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| Impact of nutrient management on soil fertility and tobacco raw material yield in the bare-soil tobacco cropping systems of Qiannan |
| Received:May 26, 2025 |
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| KeyWord:nutrient management;flue-cured tobacco;soil fertility;soil bacterial community;high-throughput sequencing |
| Author Name | Affiliation | E-mail | | REN Yonggang | Pingtang County Branch of Qiannan Tobacco Company, Pingtang 558300, China | | | SU Wulei | Pingtang County Branch of Qiannan Tobacco Company, Pingtang 558300, China | | | CHEN Zhibo | Pingtang County Branch of Qiannan Tobacco Company, Pingtang 558300, China | | | LIU Daxue | Pingtang County Branch of Qiannan Tobacco Company, Pingtang 558300, China | | | MO Luoyan | Anhui Agricultural University, Hefei 230036, China | | | ZHU Yinghua | Anhui Agricultural University, Hefei 230036, China | | | DING Ting | Anhui Agricultural University, Hefei 230036, China | | | LI Zhanghai | University of Science and Technology of China, Hefei 230041, China | | | WANG Qingyun | Anhui Agricultural University, Hefei 230036, China | qywang@ahau.edu.cn |
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| Abstract: |
| To address the problems of nutrients leaching easily during the cultivation of bare-soil tobacco in the Qiannan region and explore optimized fertilization modes that match the production demand for high-quality tobacco raw materials, this study based on field experiments systematically analyzed the relationships and impacts of different nutrient management strategies on rhizosphere soil nutrients, soil microorganisms, and tobacco yield. The experiment included five treatments: conventional fertilization(CK), 10% increased base fertilizer application amount(EF1), 20% increased base fertilizer application amount(EF2), 50% advanced topdressing under conventional fertilization rate(AF), and 50% delayed topdressing under conventional fertilization rate(RF), all plots adopted random block design. The results showed that nutrient management had no significant impact on the total contents of nitrogen(N), phosphorus(P), and potassium(K) in the soil, but effectively regulated the dynamics of available nutrients. Alkaline hydrolyzable nitrogen, available phosphorus, and available potassium in all treatments showed a decreasing trend throughout the growth period of tobacco. EF2 could increase the content of available nutrients in the rhizosphere soil significantly, while AF was unfavorable to the maintenance of nutrients after the rosette stage. The activities of urease, phosphatase, sucrase, and catalase showed a consistent pattern with the amount of base fertilizer applied. Both EF2 and AF significantly increased the soil enzyme activities at all growth stages of flue-cured tobacco. Nutrient management had limited impact on the richness and diversity of the soil microbial community; However, the EF2 and AF treatments increased the relative abundance of Pseudomonadota while decreasing the relative abundance of Acidobacteriota and Firmicutes, which was facilitated to the efficient utilization of soil nutrients cycling and promoted the improvement of the yield and quality of tobacco raw materials. The study indicated that, considering the nutrient demand characteristics of tobacco growth that nitrogen is prioritized in the early growth stage and the requirement for potassium is relatively high in the later stage, moving the topdressing forward by 50% and appropriately increasing the amount of potassium topdressing is more in line with the actual production demand of bare-soil tobacco in the Qiannan region. |
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