关键词: 上部烟叶, 物理特性, 种植密度, 施氮水平

Abstract:

 In order to explore the rational planting density and nitrogen level of paddy-tobacco in south Hunan, this paper analyzed the effects of planting density, nitrogen level and their interaction on physical properties of upper flue-cured tobacco by constructing physical properties index and partial Eta2 value from 2 factors experiments. The results showed that: ① Planting density and nitrogen level had different influencial effects on physical properties of upper flue-cured tobacco; planting density mainly influenced leaf openning degree, single leaf weight and thickness of leaf blade; nitrogen level mainly influenced single leaf weight, stem ratio and thickness of leaf blade; the interaction of planting density and nitrogen level mainly influenced leaf opening degree and stem ratio. ② The contribution rate of planting density on physical properties of upper flue-cured tobacco was about 29%; nitrogen level was about 33% and interaction of these 2 was about 38%. ③ The physical properties index of upper flue-cured tobacco increased with the increase of planting density and reduce of nitrogen level. ④ In south Hunan, the better physical properties index of upper flue-cured tobacco was gained by treatment of 18 195 plants/hm2 and 142.5 kg/hm2 nitrogen level.

Key words: upper tobacco leaf, physical property, planting density, nitrogen level