Abstract

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Author(s):: HUANG Juan1; LI Xinjian1; 2; (1.Agro-meteorological Station,A Subsidiary Organ of China Meteorological Bureau,Urumqi,Xinjiang 830002；2.Institute of Desert Meteorology,A Subsidiary Organ of China Meteorological Bureau,Urumqi,Xinjiang 830002)

Keywords:: colorimeter; fruit; color coefficient; evaluation model; grading standard

Abstract:: In order to confirm the Korla fragrant pear fruit color evaluation model,this study measured the value of fruit L,a,b in Shayidong,Shanghu Town,Halasu and Kuerchu garden spot by a colorimeter then obtained L,a,b,a/b,(a/b)2,Chroma,Hue and Brightness.Also established fruit color evaluation model and grading standard by using Principal Component Analysis (PCA) which was one of the Factor Analytic Method.The results showed that,cumulative contribution rate of the first principal component reached 88.216%;selected the color evaluation factors were a，Hue,Brightness,a/b(gradually deepened from yellow to red level approached).The Korla fragrant pear fruit color unified evaluation criteria were divided into four levels,namely excellent,good,well and ordinary.Korla fragrant pear fruit color level of certification in 2016 resulted,excellent 13.75%,good 57.50%,well 18.75%,ordinary 10.00%.