Investigation And Analysis Of Main Varieties Of Vernicia Fordii In Guangxi

Tung oil, which is world-famous industrial oil trees, is China’s specific economic trees and originat in China. Tung oil, which is one of the raw materials of biomass energy, is a kind of high quality drying oil and important industrial grease. Tung oil not only can improve the economic benefits of farmers, still can prevent water loss and soil erosion. Tung oil have ecological benefits with large development prospect, also it is an economic and material combination of tree species. The paper systematically studied7tung oil tree varieties of Guangxi, surveied yield, fruit characters, physical and chemical properties of7tung oil tree varieties of Guangxi, fund relatively superior varieties.The result is shown below.1) There are significant differences between the morphological characteristics, main distribution area, cultural characteristics of the tung oil tree. Full-fruit periods of the7tung oil tree varieties was from3years to25years. The life of7tung oil tree varieties was from15years to40years. Full-fruit period and life of Nandan bainian tung oil tree is the largest, and full-fruit period and life of Gongcheng duiniantung oil tree is the shortest. Annual growth days of the7tung oil tree varieties were from220days to260days.7tung oil tree varieties grew at altitude of200to1300meters, Du’an aijiao tung oil tree、Gongcheng duinian tung oil tree grew at altitude of200meters to500meters, and Longlin aijiao tung oil tree grew at altitude of1000meters to1300meters, it did not grew below at altitude of500meters.2) There are significant differences between7tung oil tree varieties. The Oil production per mu were from9.8kg to18.7kg at full-fruit periods, the yeild of Longlin aijiao tung oil tree, which yeild was18.7kg per mu, was the mostThe most oil production per mu of7tung oil tree varieties were from17.6kg to33.8kg, Nandan bainian tung oil tree was the best. Shape index of fruit of7tung oil tree varieties were from0.96to1.04. Average weight of air dried fruit were from19.26g to28.26g. Average thickness of the skin were from0.16cm to0.30cm. Average seed yield were from48.44%to58.2%. Average grain weight were from2.3g to3.2g. Kernel yield were from50.74%to61.3%. Tung kernel oil content were from55.67% to65.12%. Acid value were from0.35to1.12. Free fatty acids were from0.19to0.33. Iodine value were from164to193. Saponification value were from166to193. The refractive index were from1.5175to1.5210.3) Analysis for7tung oil tree varieties with Fuzzy mathematics. Analysis for7tung oil tree varieties with Comprehensive evaluation of Fuzzy mathematics,the author integrated comprehensive evaluation results of three times, found that Nandan bainian tung oil tree and Longsheng dapantao tung oil tree were two better varieties in7tung oil tree varieties.