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Fertilizing the soil in northern China there is imbalance in fertilizer application, the distribution of unreasonable, do not pay attention to scientific fertilization, the proportion of non-conforming fertilizer nutrients, fertilizers, varieties of structure is irrational, improper fertilization, the decline in the proportion of organic fertilizer problem. This will certainly have the physical and chemical properties of soil are affected, especially in soil nutrient status will change a lot, thereby affecting the normal growth and development of plants. Of certain broad-leaved species of leaf mineral nutrient analysis conducted to determine their nutritional status, has become a broad-leaved species to improve the nutritional environment and the key application is to improve the quality of the species one of the important this paper, in Shenyang City for five tree nurseries and the ratio of nutrient elements, select the down elm leaves, which are nitrogen, phosphorus, and potassium nutrition diagnosis, and physical and chemical properties of soil and plant biomass were analyzed, synthesis method to diagnose fertilization (DRIS) and the profit and loss index (PLI) is applied to the leaves of the nutrition diagnosis, determination of this species leaves the balance of mineral nutrient content and nutritional adequacy ratio parameter threshold is designed to guide the key to timely fertilization period of broad-leaved species provide a reference balanced fertilization. To carry out this study, it will fall into the nutritional balance during the broad-leaved species of guiding significance for fertilization.

我翻译的都快吐血了。。。怎么都是这么专业的词汇，暴汗！！！There are problems of fertilizing imbalance,distributing improperly,negelecting scientific fertilizer,coordinating unreasonable proportion and structure of category,as well as the utility of fertilizer,along with the decreasing proportion of organic fertilizer ever existed in the process of is inevitable to influent the physical and chemical properties of the earth,especially to its nutrient conditions that will further hinder the normal is one of the significant methods to enhance the quality of the seeds and the key of improving the nutrient environment as well as fertilizing to analyze the mineral nutrition and judge its nutrient conditions of certain leaves from broad-leaved species. This thesis is analyzing the elements of nitrogen, phosphorus and potassiumin based on the issues of nutrient proportion in five tree nurseries in a linear analysis on the physical and chemical properties and plant fertilization (DRIS) and the profit and loss index (PLI) should be applied to the diagnosis of nutrions so as to measure the balance of mineral nutrient content and nutritional adequacy ratio parameter as well as provide reference for timely fertilization period of broad-leaved study will guide the balanced fertilization of broad-leaved species during the nutrion transforming period in the autumn.