Effect of Climate Indices Based on Different Transplanting Date on Tobacco Quality and Style

A field experiment was conducted to investigate climate conditions on tobacco quality and explore the reason of full aroma tobacco formation condition by adjusting the transplanting date and changing the climate configuration of different growing stages. The result showed that the effect of adjusting transplanting dates on climate indices was great, especially for daily mean temperature. The full aroma style decreased with later transplanting date and the formal sweet aroma enhanced. The best transplanting date was from the end of April to the first ten days of May based on the requirement of temperature and sunshine. About 900 to 1200 ℃/d effective accumulated temperature, 24.5 to 27.5 ℃ daily mean air temperature, 10.0 to 12.5 ℃ diurnal temperature and 135 h daylight hours were required for full aroma tobacco production. About 350 h daylight hours, 21 to 23.5 ℃ mean air temperature, 13.0 ℃ diurnal temperature and 350 ℃/d effective accumulated temperature were necessary for completing root extending stage; about 400h daylight hours, 26.6 ℃ mean air temperature, 13.0 ℃ diurnal temperature and 550 ℃/d effective accumulated temperature were needed for completing vigorous growth stage; about 550 h daylight hours, 27 ℃ mean air temperature, 9.0 ℃ diurnal temperature and 900 ℃/d effective accumulated temperature were necessary for completing maturing stage.