Study On Determination Of Rational Quantity Of Fertilization Formulated For Winter Jujube By Soil Testing In Dong Ying

The land resource is rich in the Yellow River delta area, the soil salinization is serious. Here is a subhumid warm temperate climate zones, its average precipitation is less in each year and frost-free period is short. The special climate and soil condition caused the lack of local fruit trees. Due to its adaption to local natural conditions, jujube cultivation has a long history. As a best quality, late-maturing and rare food, dongzao was produced in this region. Dongying is the center of the Yellow River Delta area, it has developed Dongzao industry since 1996. Due to the differences in soil nutrient status, the simple management and the single fertilization methods, it caused many problems, such as the soil's potential production couldn't be displayed fully, the products' quality was unstable, fertilizer questions and so on. Dongying started the project about soil test and fertilization in winter in 2005, the implementation plan made by soil test results and scientific fertilization is carried out. In this paper, based on the nutrient analysis of the sample soil in the main producing areas, we has understanded the soil's nutrient condition in different area. Through the method about ratio of nitrogen, phosphorus and potassium and the fertilizer experiment, the volume of soil nitrogen and the best ratio of fertilizer application were determined; according to the principle of taking the organic fertilizer primarily, the chemical fertilizer for the auxiliary , the plan of fertilizatation is defined.The experiment indicated that soil nutrient status had the obvious rule in the six main production area. The best ratio of nitrogen, phosphorus and potassium is 1.5-2:0.6-0.8:2-2.5. The implement plan practised in the actual production has made significant results.