Comprehensive Evaluation Of Tobacco Leaf Quality Based On Grey System Theory

Tobacco is one of the important economic crops in our country.It occupies an important position in the agricultural economy and in international trade from the long time ago.It is an important part of the national economy.The tobacco leaf's quality evaluation is the style and characteristics of tobacco leaves research,tobacco processing characteristics research,module formula means research and leaf group substitution technology research and other many tobacco frontier research foundation.Study on the application of the grey system theory in quality evaluation of flue-cured tobacco,the main conclusions are as follows:This paper uses grey entropy optimization weighted grey correlation degree on the chemical composition of two flue-cured tobacco varieties and chemical composition of typical fragrance tobacco leaf of correlation evaluation of 7 counties in Bijie tobacco growing area(city).The results showed: the weighted grey correlation degree of membership clouds of Yunyan 85 are arranged as follows: Weining > Nayong > Bijie >Jinsha> Zhijin > Qianxi > Dafang;weighted grey correlation degree membership clouds of Yunyan 87 are arranged as follows: Weining > Bijie > Nayong > Jinsha > Qianxi > Dafang.In order to compare the differences of Guizhou Province's tobacco area in Bijie in different soil parent rock between flue-cured tobacco chemical composition,this paper uses the method of grey relational clustering analysis,clustering evaluation the 149 flue-cured tobacco samples(C3F grade)of the 10 chemical component indexes.The results show: according to the difference of chemical components of flue-cured tobacco,16 kinds of different parent rocks can be divided into 4 categories,the first class to yellow sandstone alone into category;class II for dolomite,including 7 kinds of soil parent rock;class III of dolomitic limestone into alone class;class IV for the Quaternary red clay,including 7 kinds of soil parent rock.Between the various groups by analysis of variance,the 10 chemical indexes in 6 group in the difference between reached extremely significant level,proved the reliability of grey correlation cluster.This paper uses the grey fixed weight clustering analysis of chemical components of tobacco leaf on clustering analysis of 25 areas of faint scent type tobacco producing area,the results showed that: 14 regions of Guangdong Nanxiong,Guizhou Tongren,Sichuan Liangshan,Sichuan Meigu,Sichuan Ningnan,Sichuan Xichang,Sichuan Xuyong,Sichuan Zhaojue,Yunnan Fuyuan,Yunnan Kunming,Yunnan Luliang,Yunnan Qujing,Yunnan Shizong,Chongqing Wuxi belongs to the A class;6 areas of Guangdong Shaoguan,Guizhou Bijie,Hunan Guiyang,Jiangxi Ganzhou,Yunnan Dali,Yunnan Yuxi belongs to the B class;5 areas of Guangdong Meizhou,Hunan Chenzhou,Sichuan Dechang,Sichuan Huili,Chongqing Pengshui belongs to the C class.Research on the application of the grey prediction model predict Henan flue-cured tobacco single output,results show that the Henan tobacco acres of single production in continued to decline,production forecast for 2210/hm2 in2014,after correlation inspection related degree reached 0.96,with high correlation prediction more accurate results.This paper adopts the analysis method of grey correlation decision,to give a comprehensive evaluation of the 16 kinds of soil parent rock of tobacco samples,the results showed the highest value of yellow sandstone average decision-making(0.92),secondary dolomite average decision value(0.65),Quaternary red clayand dolomitic limestone class average decision value is relatively low,respectively 0.54 and 0.52.From the evaluation results can be seen,most of the performance types of soil parent rock is excellent in Bijie tobacco area.In order to evaluate the quality of flue-cured tobacco in different soil type and soil texture,collected 149 soil samples(including 5 soil types and 8 soil texture)and the corresponding149 Yunyan 85(C3F)of tobacco samples,compared 10 chemical component indexes on the tobacco leaf samples,and used multiple targets decision method based on entropy weight for a comprehensive evaluation to the chemical composition of tobacco samples.The results showed that: in the 10 leaf chemical component indexes,6 indexes of soil types between the difference reached significant level;soil texture difference between 5 indexes reached extremely significant level,the difference of 1 indexes reach significant level;performance of the tobacco leaf chemical component indexes in the soil types and between different quality,comprehensive evaluation the results show that 5 types of soil between performance: purple soil > yellow soil>yellow brown soil > lime soil > fluvo aquic soil;in the 8 kinds of soil texture between performance: silty clay loam > clay loam > clay > silty clay > loam clay >loam > silt clay loam >sandy clay loam.