Tree Structure Charcteristics And The Nutrient Elements Of Soil And Leaves In The Orchards Of High And Low Yield In The Loess Plateau

We construct the correlation coefficients between tree structure, nutrient elements of soil , nutrient elements of the leaves with yield and fruit quality in the orchards of high and low yield in loess plateau areas through the experiments of investigation and analysis of eleven different orchards with nitrogen on structure characteristics of the tree struction and the nutrient elements in the orchards of high and low yield in Fengxiang ,Pucheng, Jingchuan ,Changwu from April in 2008 to November in 2009. The main results are as follows:1,This article through the diagnosis which if the Red Fuji Apple tree stuction indicators between the output.We draw the conclusion that height of treetrunks,diameter of tree trunks,diameter of cromn,short pranch Proportion and yield is positive correlation. Typeds of branches are the main factor which influence the yield. The proportion of long pranch and yield is low correlation; moderate-length pranch Proportion and yield is low negative correlation; The proportion of short pranch and yield is high-positive correlation, the correlation coefficient R2 is 0.7141 in the orchards of hign yield.The proportion of long pranch and yield is negative correlation; moderate-length pranch proportion and yield is low correlation, but the proportion of short pranch and yield is high- negative correlation in the orchards of low yield.The results reflect that the proportion of various of pranch is not reasonable, especially the proportion of short pranch is so low in the orchards of low yield.2,The results showed that leaf N and P concentration have an increasing tendency as yield level increased in the orchards of high yield. But the leaf P had low correlation index with yield.The soil available K concentration has an increasing tendency as yield level increased and has high correlation index with yield, leaf K and yield is positive correlation. Leaf Mg, Zn, Mn content in high yield orchards are signifieant higher than that of low yield orehads, Leaf Ca , Gu, Fe content has no signifieant correlation between high and low yield orchards.3,Leaf K and Mn content are positively correlated with fruit Soluble solid , but Cu and Zn content are negatively correlated with fruit Soluble solid; Leaf Mn,Zn,K content are all positively correlated with fruit ratio (Soluble solid/ Titratable acid); Leaf Fe,Cu contents are negatively correlated with fruit Hardness, but K content is positively correlated with fruit Hardness. Soil alkaline hydrolyzable N in high yield orchards is signifieant higher than that of low yield orehads, soil available P and K concentration have an increasing tendency as yield level increased, and soil available K was more positively correlated with yield .The depth of 0 -20 cm soil soil alkaline hydrolyzable N, available K are negatively correlated with fruit Soluble solid and fruit Hardness ; Correlation of soil available P and quality indicators of Fuji is not high.