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Jiang H.,Chongqing Tobacco Science Research Institute | Li N.,Chongqing Tobacco Science Research Institute | Shan P.,Dali Branch of Yunnan Province Tobacco Company | Wang H.,Chongqing Tobacco Science Research Institute | And 2 more authors.
Tobacco Science and Technology | Year: 2013

For producing flue-cured tobacco seedlings at the areas of low temperature and less sunshine, closed seedling producing technique was studied with a self-configured closed seedling production system for flue-cured tobacco, the working principle of the system was introduced and its specifications and parameters were determined. The results of experiments showed that it only needed 22 days for cultivating seedlings of 4.5 leaf age with this technique, which was 24 days shorter than that with a greenhouse floating seedling system; the stalk circumference of seedling, the dry weight of leaf, stalk and root, root-shoot ratio, and vigorous seedling index increased by 35.29%, 8.48%, 49.23%, 160.00%, 74.22% and 83.78%, respectively; moreover, the costs of direct and heeled-in transplanting of the seedlings from closed system reduced by 101.3 and 30.4 RMB yuan per 667 m2, respectively. Closed seedling producing technique effectively solved the problems of longer seedling age and lower vigorous seedling ratio at areas of low temperature and less sunshine, it reduced the consumption of non-renewable peat resource and more significantly the cost of seedling production. Source


Hou-Long J.,Southwest University | Na-Jia L.,Southwest University | An-Ding X.,Southwest University | Chao Y.,Southwest University | And 5 more authors.
Australian Journal of Crop Science | Year: 2014

To overcome difficulties in seedling breeding in low temperature ( the average temperature is 14.65 in March and April) areas and in areas receiving a low amount of sunlight (the average sunlight hour is 93.55 h in March and April), a closed-type transplant production system was designed and studied using flue-cured tobacco as the plant material. The system was used for breeding the tobacco seedlings and was compared with the floating system. The closed-type transplant production system shortened the breeding period, with the tobacco seedlings reaching the 5-leaf growth stage at approximately 25 d sooner than in the floating system. The stem diameter, dry weight of the roots, stems and leaves, root/shoot ratio, and rate of healthy seedlings were higher by 35%, 160%, 49%, 8%, 74%, and 84%, respectively, in the closed-type system than in the floating system. The costs of seedling breeding in the closed-type system with and without heeling-in (direct planting) were reduced by 70% and 21%, respectively, compared with the floating system. Our results showed that the closed-type transplant production system effectively mitigated the problems of long seedling age and low rate of healthy seedlings in low temperature areas and in areas receiving a low amount of sunlight without lowering the agronomic qualities of seedlings. Furthermore, this closed-type transplant system reduced the consumption of wetland peat, which is a non-renewable resource, thereby significantly reducing the cost of seedling breeding. This system can potentially solve transplant crop production problems encountered in low temperature areas and in areas receiving a low amount of sunlight in China. Source


Zhao T.,Henan Agricultural University | Shi H.,Henan Agricultural University | Fan Z.,Dali Branch of Yunnan Province Tobacco Company | Xu F.,Dali Branch of Yunnan Province Tobacco Company | And 7 more authors.
Tobacco Science and Technology | Year: 2013

Experiments were carried out to analyze the composition and content of alkaloid in burley tobacco of Binchuan and different varieties from different areas in Yunnan, and the proportion of converters and nicotine conversion rate were calculated to determine the characteristics of alkaloid composition and the feasibility of variety improvement. The results showed that the average content of alkaloid in Binchuan burley tobacco was 3.31%, which was similar to that in imported quality burley tobacco, nicotine conversion was not a problem of imminent concern, though the variation of nornicotine content and nicotine conversion rate was found at different experiment points. Comparison of conversion rate for individual plant between different burley varieties showed that OD911 and YNBS1 with lower average conversion rate had relatively less problem of nicotine conversion; most plants of TN86 were low converters; the average conversion rate of TN90 was 11.84%, there were some plants with high conversion rate of 10% ; Eyan 1 had a higher proportion of converters, about 16.67% of plants were high converters, and the average conversion rate reached 30.51%, thus the systemic selection and variety improvement were necessary. Source

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