黑龙江地膜烤烟移栽适期的试验研究

Study on the Transplanting Time of Flue-cured Tobacco with Plastic Film in Heilongjiang

地膜覆盖是弥补黑龙江省烤烟生产热量不足的有效措施之一。试验结果表明黑龙江省地膜烤烟的适宜移栽期范围为５月１日至５月１０日。大田生育起点温度，ＮＣ８９约为９．５℃，Ｇ１４０和Ｃｏｋｅｒ１７６约为７．５℃。随移栽期的提早，后期田间长势有下降的趋势；移栽过早，旺长期遇干旱，烟株早衰，产质降低；还需提前播种育苗，防寒设施和育苗用工增加，得不偿失，不宜提倡。

Shed-cultivation with plastic film is one of the effective measures to make up the heat shortage in Heilongjiang caused by climatic zone. The experiments and investigations showed that the proper transplanting time is from may 1 to may 10. The lwoest temperature for tobacco development in the field is about 9.5℃ for NC89 and 7. 5℃ for both G140 and Coker 176. The earlier the transplanting timeis, the more weakly the tobacco plants develop in the late development stages. Too early transplanting makes tobacco plants meet dry season in the fast-growing stage, and moreovr needs earlier cultivation of seedings, which will increase the labor and cost for cold protection. So too early transplanting will not be recommended.