关键词: 库尔勒香梨；叶片, 营养元素；年变化规律, 产量；相关性分析

Abstract: In order to understand the variation rules and correlation of various mineral nutrient elements in the leaves of Korla fragrant pear, the changes of the content of 9 mineral elements in the leaves of different yield Korla fragrant pear orchard during the growth period were determined and analyzed.The result showed that the variation trend of the content of the same nutrient element in the leaves of different yield pear orchard was basically the same.The contents of N and P in the leaves were downward gradually in a year with the development of Korla fragrant pear;Mg and Mn contents were upward;K,Ca,Cu,Fe and Zn contents increased gradually in early growth phase and decreased later.The average values of the mineral nutrient elements in the leaves of Korla fragrant pear during the growth and development period were successively N,K,Ca,P,Mg,Fe,Mn,Zn,Cu. The average values of the N,P,Ca,Mg,Cu and Mn elements contents were showed as low yield orchard>middle yield orchard>high yield orchard, the average value of the K element content was showed as low yield orchard>high yield orchard>middle yield orchard,while the average values of the Fe and Zn elements contents were showed as high yield orchard>middle yield orchard>low yield orchard. Correlation analysis showed that there was a certain synergy and antagonism between the nutrient elements in the leaves of Korla fragrant pear.There was an extremely significantly negative correlation between the average values of the N,Mg and Mn contents and yield,and a significantly negative correlation between the content of P element and yield, and a significantly positive correlation between the content of Fe element and yield.There was an extremely significantly positive correlation between the contents of N and Mg,P and Ca,Ca and Cu,Mg and Mn in the leaves,and a significantly positive correlation between the contents of N and Mn,P and Cu,Fe and Zn,K and Ca,K and Cu in the leaves,and an extremely significanly negative correlation between the contents of N and Fe,Mg and Fe in the leaves,and a sighificantly negative correlation between the contents of Fe and Mn in the leaves.The fertilizer application of trace elements Fe,Zn,Cu and Mn should be further improved on the basis of maintaining the N,P,K,Ca and Mg contents in the production of Korla fragrant pear, thus balancing the tree nutrition and achieving the goal of stable and high yield.

Key words: Korla fragrant pear, Leaf, Nutrient elements, Annual variation rule, Yield, Correlation analysis