Study On The Relationship Between Quality Of Flue Cured Tobacco And Ecological Factors In Guangnan Tobacco Growing Area

Tobacco is a kind of economic crops with high value.It plays a very important role in the process of economic development in China,and it has become the source of hundreds of millions of people in the world.At present,it has become the focus of research on how to improve the quality of tobacco leaves.The quality of tobacco leaves is a complicated concept.It includes the appearance quality,sensory quality,physical characteristics,chemical composition and safety.Meteorological and soil are two main factors affecting the quality of tobacco leaf.The main results are as follows:in this paper,the distribution of different grades of tobacco in Guangnan and the corresponding climate and soil environment characteristics are analyzed:(1)the tobacco quality of Guangnan tobacco characteristics:much of the color is orange,maturity can meet the requirements of relatively loose organizational structure,in the color offset and strong,there is still a part of the leaf maturity is not enough,and the oil content is not high,compared with the total sugar reducing sugar content is high,suitable for planting range.The planting environment within the range of nitrogen,potassium,chlorine and potassium chloride content proportion is reasonable,nitrogen content and potassium content of volatility is relatively small,with characteristics of Guangnan area middle tobacco flavor,and concentrated flavor.In the comprehensive evaluation of appearance quality score is not high.(2)the main meteorological factors and soil change characteristics of flue-cured tobacco in Guangnan:the main factors affecting climate and soil are light,temperature and rainfall of three.(3)correlation between meteorological factors in Guangnan tobacco growing period and chemical composition of tobacco leaves:total sugar and 3,July 4,the light is very significant,3-July temperature,precipitation,humidity showed very significant,many of the March and April precipitation significantly.Sugar and July is very significant,and the 3-July temperature,precipitation,humidity,significant or very significant,but the precipitation in March and April a significant negative correlation.Chlorine content and 3-July related temperature and humidity are significant.Nicotine,total nitrogen and potassium were not correlated with climatic factors.(4)correlation between meteorological factors and sensory quality of the field growth period:the quality of tobacco,aftertaste,mixed gas,irritating,flammable,ash content and the total score and July temperature,humidity,temperature,and aroma quantity in July 4 and July relative humidity.(5)the quality of tobacco:changes in the physical and chemical properties of soil,soil pH value is not suitable for large regional differences,soil nutrient status is not high in proper proportion of chemical components in flue cured tobacco quality is not stable,large regional differences,the overall quality is not high.The difference of nitrogen,phosphorus,boron and zinc between the areas was large,which led to the lack of nutrition or excess in some areas,and the slow growth of tobacco plants.