Study On Fertilization Effect Of Controlled Release Urea Of Black Soil In Jilin Corn Belt

As one of the three corn belts in the world, Jilin corn belt corn remains at about 2800 thousand hectares which has reach 12% of corn cultivation area over the country and it is 62%-66% of various food crops cultivation area in Jilin province. Corn is one of the benefits of making the main economic income of farmers in Jilin province. Nitrogen to be particularly important of variety nutrients for maize growth, nitrogenous fertilizer is the main source of corn nitrogen.In this study, with nitrogen fertilizer effects and problems with black soil in Jilin corn belt,using laboratory and field trials testing the combination of controlled release urea compared the thinking of the indoor water release rate test,different nitrogen treatments in black soil areas of Jilin Corn Belt Soil inorganic nitrogen content of corn plant height,dry matter accumulation, N utilization analysis and economic impact of corn,corn with black areas to explore Jilin controlled release urea fertilizer effect, made the following main results and progress:1.Controlled release urea used in this experiment, the water release rate of it in the growth of the cumulative release rate with time is the number of curves showing trends of increasing, in line with logarithmic equation. Moreover, the cumulative release rate of nutrient release of controlled release urea was positively correlated with temperature, compared with 25℃,40℃water cultures in nutrient release under the conditions of significantly faster.2.At early growth stage of corn, no significant difference between the treatments at plant height, but after the jointing stage,plant height showed the various nitrogen fertilizers processing plant height to be better than the control treatment. And in the case of the same amount of nitrogen, controlled release urea processing plant height than the common urea. In the latter part of maize growth, the treatment of common urea plant height higher than the height of each treatment with controlled release urea. Throughout the growth period of maize were generally show urea topdressing treatment and the combination of the base facilities and the handling of dry matter accumulation than common urea.3.In two experimental zones:Dehui Xinglong and Gong Zhuling Tao Jiatun,controlled release urea for black soil region in Jilin corn belt in the corn growth period can be slowly released nitrogen for the corn growth and reduce nitrogen absorption and utilization down leaching, volatilization may be small possible relatively.4. Compare with common urea,controlled release urea the average maize yield components to better coordinate the relationship between the various factors that corn grain number and grain weight may be raised. Topdressing urea-based giving and the combination of controlled release urea and urea mixed than one-time application of urea-based facilities the average yield component traits well.5. Controlled release urea fertilizer can improve corn yield the black soil area of Jilin Corn Belt was spring increase yield 1642kg/hm2-6300kg/hm2, increase range was 15.73%～117.60%. And at the same nitrogen level, to black soil in Jilin Corn Belt controlled release increased maize production by greater than common urea.6. Under the same nitrogen application, the controlled release urea than the urea treatment and can meet the crop nutrient needs in the case of reduction of fertilizer can increase the apparent efficiency of fertilizer. The controlled release urea and urea mixed fertilizer than single common application of urea effect. Controlled release urea CRU75% B partial productivity in Dehui Xinglong and Gong Zhuling Tao Jiatun was 74% and 76.7%, it was better managed among difference N treatments.7. For trial in the Jilin Corn Belt two black soil areas, corn nitrogen fertilizer can bring significant economic benefits. Under the same nitrogen application, Gong Zhuling Tao Jiatun nitrogen treatments bring more the economic benefits than Dehui Xinglong. And in two pilot areas, controlled release urea than common urea under the same nitrogen application, to bring greater economic benefits of corn. And controlled release urea reduction treatment brings the highest economic benefits among the difference N treatment. Therefore, the controlled release urea on the black soil in Jilin Corn Belt has bright application future.