Studies On Tree Nutrition And Soil Nutrition Of "Ping Guo Li

This paper was on the basic of three year's continuous studying Ping Guo Li orchard in HE TAO area; The soil and the leaves, sampled from which, was systematically studied. The result showed that not only N-. P. K, the content of organic matter contain in soil but also leaves nutritional elements (except for Ca) in these three levels(high middle .~ low level).orchards were always in accordance with the regular pattern that in high orchards was higher than in middle orchards, and in middle orchards was higher than in low level one~. The study showed that K was the smallest element among leaves nutrient in the three levels orchards, it exerted a great influence on nutrition yield and quality of a tree. On the contrary, only Ca element of leaves was higher in low level orchards than in middle ones and in the middle orchards was higher than in the high ones. What抯 more, it had negative correlation with other elements in leaves. Rational soil fertilization could improve soil nutrition and leaves nutritious level. The test results suggested that the suitable fertilizer rate of a fruit period Ping Guo Li single-tree was after blossom fertilizer the mixed rate of 10-20Kg organic manure and 500g fruit tree complex fertilizer.