Tongliao City Spatial Distribution Of Soil Effective Zinc Content And Soil Effective Zinc Critical Value Research

It is a widely concerned problem that the soil lacks zinc, according to the second national soil census data, it showed that51.1%of national arable land existed zinc deficiency, the problem was universal. This paper regards the corn production area of Tongliao City as the study area, aims at knowing about the available zinc content of the soil and the spatial distribution characteristics, analyzes the influence of the available zinc content in soil for corn yield-increasing effect, and clear the critical value of zinc deficiency in corn soil in order to provide gists for the scientific application of zinc fertilizer. This research uses more than40,000soil avail effcable zinc content interpolation data and56corn zinc fertilizer experimental data in Tongliao City to analyze and obtain the research results as follows:1.The difference of soil available zinc content of the cultivated land in the city is larger, the average content is0.87mg/kg.The soil available zinc content distribution is different in different county, different soil types, soil under different geomorphic types, different ways of using.2.The effect of applying zinc fertilizer is significant negative correlation with the soil available zinc content, the levels of soil available zinc content reflect the soil zinc element fertility,and affect the effect of applying zinc fertilizer significantly.3. On the basis of no zinc controlled production accounted for90%of zinc processing production as a standard to determine soil zinc deficiency, the available zinc critical value of corn soil in Tongliao city is0.56mg/kg. According to this standard, the major corn producing areas in Tongliao city around13.1%is deficient in zinc element.