In order to solve the low-temperature hazards in flue-cured tobacco seedling raising at high altitudes in Shizhu,the effects of different temperature-increasing measures on environmental temperature and the growth and development of flue-cured tobacco seedlings were researched. The results showed that the double-decked awning measure,double-decked awning+pool bottom bedding measure, and germination-accelerating seedling-raising measure could respectively improve average temperature by 0. 84,1. 14,5. 42 ℃ compared with floating system,the seedlings came out 6,7,14 days in advance and the whole growth period shortened by 6,8,12 days. Besides, these temperature-increasing measures improved the quality of seedling to different degrees and promoted tobacco material accumulation. The analysis of different parts of tobacco seedlings demonstrated that the germination-accelerating seedling-raising measure could promote the growth of tobacco parts on the ground,while the double-decked awning+pool bottom bedding measure stimulated the growth of tobacco seedling roots. In production,it is suggested to optimize different measures to increase total effective temperature in order to achieve the ideal effect of seedling cultivation.%为解决石柱高海拔烟区烤烟育苗中的低温危害,研究了不同的增温、保温措施对环境温度和烟苗生长发育的影响.结果表明:与常规漂浮育苗相比,双棚覆盖、双棚+池底铺垫、集中堆码催芽处理可分别提高日均有效积温0.84、1.14、5.42℃,使出苗期分别提前6、7、14d,全生育期分别缩短6、8、12d,且不同程度地提高了烟苗素质,促进了烟苗的物质积累.综合分析,集中堆码催芽处理促进烟苗地上部分生长的效果最好,而双棚+池底铺垫处理较利于烟苗根系的生长.生产中,应将不同措施进行优化组合,争取较高的有效积温,以达到理想的育苗效果.
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