不同增温措施对烟苗生长发育的影响

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。

Effect of Different Temperature-increasing Measures on Growth and Development of Flue-cured Tobacco Seedlings

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 improveaverage 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 toba-cco 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 mea-sures to increase total effective temperature in order to achieve the ideal effect of seedling cultivation.