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| Effects of Double Ridge Tillage Combined with Straw Returning on Soil Nutrients and Tobacco Yield and Quality |
| 1. China Tobacco Guangxi Industrial Co., Ltd., Nanning 530001, Guangxi, China; 2. College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha 410128, Hunan, China; 3. Chenzhou Branch of Hunan Provincial Tobacco Company, Chenzhou 423000, Hunan, China |
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Abstract To explore the effects of two cultivation measures of double ridge tillage and straw returning as well as their interaction on soil nutrients and tobacco yield and quality, the flue-cured tobacco variety K326 was used as the experimental material, and a field trial with randomized block design was conducted in a flue-cured tobacco planting area in Yizhang County, Hunan Province, based on two kinds of ridge tillage methods (one is one-time ridge tillage, and the other is the first ridge tillage followed by soil exposure to sun-light, and then the second ridge tillage) and whether rice straw returns to field or not. The results showed that, compared with one-time ridge tillage (T1+T2) and no straw returning (T1+T3), the double ridge tillage (T3+T4) and straw returning (T2+T4) significantly increased soil organic matter content, and improved the sugar-nicotine and nitrogen-nicotine ratios of tobacco leaves as well as the tobacco yield, output value and productivity. The positive interaction between double ridge tillage and straw returning was significant. In ad-dition, the double ridge tillage also significantly raised the total sugar and reducing sugar contents of tobacco leaves, and significantly lowered the nicotine content, leading to more suitable sugar-nicotine and nitrogen-nicotine ratios. In terms of sensory evaluation, rice straw returning could significantly improve the sensory quality of tobacco leaves. Due to a higher production cost resulted from double ridge tillage, for the sandy soil with good basic fertility, one-time ridge tillage combined with rice straw returning could achieve better economic returns. The study provides scientific evidence for better cultivation of flue-cured tobacco in to-bacco-rice rotation areas in Hunan Province.
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Received: 25 September 2023
Published: 19 February 2024
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