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| Spatial variation characteristics of soil nutrients for tobacco cultivation and soil fertility evaluation in Zunyi City |
| Received:September 11, 2024 |
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| KeyWord:Zunyi City;soil fertility;spatial heterogeneity;comprehensive evaluation |
| Author Name | Affiliation | E-mail | | PENG Yulong | Zunyi Branch Company of Guizhou Tobacco Company, Zunyi 563000, China | | | GOU Jianyu | Zunyi Branch Company of Guizhou Tobacco Company, Zunyi 563000, China | | | ZHAO Hongmeng | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 211135, China | | | WANG Yu | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 211135, China | wangyu@issas.ac.cn | | WANG Shenqiang | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 211135, China | sqwang@issas.ac.cn |
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| Abstract: |
| To clarify the spatial-temporal variability characteristics of soil nutrients and soil fertility properties in the tobacco-planting areas of Zunyi City, Guizhou Province, a total of 369 tobacco-growing soil samples were collected from 11 districts and counties in Zunyi′s main tobacco-producing areas. Sixteen indicators, including soil pH, organic matter, total and available N, P, K, and medium and trace nutrient elements, were measured in this study. The fuzzy mathematics method was applied for a comprehensive evaluation of soil fertility suitability in the tobacco-planting areas of Zunyi City. The average soil pH value in Zunyi ′ s tobacco-growing areas is 6.5, suitable for tobacco growth, with higher pH levels in the south, gradually decreasing towards the north, though some regional inconsistencies were observed. Except for the ring-shaped high organic matter distribution in the southwestern part of Suiyang County and the southern part of Tongzi County, organic matter levels in other areas were within the range suitable for tobacco growth. The average content of alkaline hydrolyzable N is relatively high at 151.9 mg·kg-1, which may lead to excessive vegetative growth and late maturation, reducing the quality of tobacco leaves. The levels of total and available P and K were generally high, effectively meeting the nutrient demands of tobacco. However, the exchangeable Ca levels in certain areas were low, and the soluble Cl content was high, which may impact tobacco leaf combustibility. The available Fe, Cu, Zn, Mo, and B are at suitable levels or above, meeting the needs of tobacco plants throughout their growth period. A further evaluation of soil fertility suitability was conducted using fuzzy mathematics, integrating soil pH, organic matter, and macro- and micronutrient levels. The comprehensive score was 0.81, with 98.4% of areas rated at level Ⅲ or above. Daozhen County, Renhuai City, Wuchuan County, and Zheng′ an County showed notably higher proportions of level Ⅰ soil fertility, at 52.8%, 61.5%, 69.4%, and 54.3%, respectively, indicating strong suitability for high-quality tobacco production. Soil fertility in Zunyi City shows significant spatial variability, generally decreasing from northeast to central areas and then increasing toward the southwest.However, to produce high-quality tobacco leaves, it is crucial to further optimize the application of organic and nitrogen fertilizers and enhance the availability of exchangeable Ca and soluble Cl. These improvements will help increase both yield and leaf quality, thereby boosting the production benefits for tobacco farmers. |
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