Study on Minimum Data Set for Evaluating Soil Fertility of Camellia oleifera in Zhejiang Province

From the end of October to the beginning of November in 2015 and 2016, 150 soil samples were collected from Camellia oleifera stands intwenty counties of 6 main producing regions of Zhejiang province. Determinations were made on 13 indicators of fertility, such as total nutrients,available nutrients and microelements, etc. Principal component analysis on total data set demonstrated that the minimum data set included thefollowing six indexes, total nitrogen, phosphorus, exchangeable calcium, exchangeable magnesium, available copper, and available iron. The fertilityindex was standardized by parabolic shape function, and the minimum data set fertility index was calculated according to weight coefficient. Thecorrelation analysis showed that the fertility index of minimum data set had significant positive correlation with annual tea oil yield, and extremelysignificant positive correlation with nemero comprehensive index.