Effects of Chilling and Continuous Rain Damage on Chemical Composition and Yield of Flue-cured Tobacco in Western Hubei

Wang Lijuan; Chen Zhenghong; Ren Yongjian; Chen Yingying; Wang Junchao; Cheng Dan

doi:10.16765/j.cnki.1673-7148.2023.06.009

Abstract：Based on the meteorological data of the National Meteorological Station in the tobacco-planting area of western Hubei,the chemical composition data of flue-cured tobacco and the yield per unit area,this article analyzes the main meteorological elements of tobacco in western Hubei and the dis-tribution characteristics of chilling damage and continuous rain disasters during the growth period of tobacco by using statistical and ArcGIS interpolation methods.Besides,chemical composition and its relationship with meteorological elements such as average temperature,precipitation and sunshine hours are also ana-lyzed.On this basis,the influence of continuous rain on the quality and yield per unit area of flue-cured tobacco is further analyzed.The results show that the occurrence frequency of chilling damage in the to-bacco areas of southwestern Hubei during the root extension and mature stages is higher than that in the northwestern part.The frequency of low temperature chilling damage in the tobacco-growing area of west-ern Hubei shows a decreasing trend.The distribution characteristics of the frequency of consecutive over-cast and rainy days and the longest continuous rainy days are similar,more in the south and less in the north.The frequency and intensity of continuous rain in the southern part of Enshi Prefecture are high and strong.The longest duration of continuous rain has a higher correlation with reducing sugar,chlo-rine,potassium-chlorine ratio and sugar-to-alkali ratio of tobacco leaves,and,especially,its correlation with the reducing sugar is the highest.Continuous rain for a long time is an important negative factor af-fecting the chlorine content in tobacco leaves.It has a positive certain impact on the potassium chloride ratio of upper leaves and lower leaves.Generally,the longest continuous rainy days have negative impact on the flue-cured tobacco yield per unit area in southwestern Hubei,but positive impact in northwestern Hubei.