Effects Of Bulk Blending Fertilizer Of Controlled Release N With Different Controlled N Ratio On Wheat Yield And Related Traits And Nutrient Leaching Characteristics

For the highest yield, application of mass readily available fertilizer of modern agriculture seriously polluted the environment. The BBF of controlled release nitrogen not only enhances the yield of crops but also prevents the non-point source pollution effectively. We study the effects of BBF of controlled release nitrogen with different controlled nitrogen ratio on wheat yield and releated traits and nutrient leaching characteristics to testify appropriate ratio of controlled nitrogen and the characteristic of nutrient leaching which provides scientific basis for practical production and sustainable agricultural development.In order to illustrate the characteristics of nutrient leaching and effects of BBF of controlled release N with different controlled N ratio imulated irrigation and rainfall experiment of undisturbed soil column and wheat field experiment were conducted in this study. The main results and conclusions were as follows:1. The BBFs of different controlled N ratio can effectively stabilize the pH and EC; reduce the loss of NH4+-N, NO3--N and other N forms, the same to P, K; maintain the soil nutrients farthestly under the condition of simulated irrigation and rainfall. The BBFs with higher ratio of controlled N leach the fewer nutrients and enhance the efficiency. The BBF with controlled N ratio of 59% guarantees the control and supply of nutrients at the early and later stages of crops'growth. It can be extended in the field widely.2. The BBFs with higher ratio of controlled N reduce the loss of N at the different wheat growth stages and defer the release sumit of N. The loss amount of the BBF with controlled N ratio of 59% is higher than the other ratio'BBFs, but is lower than the CCF significantly. The loss amounts of leaching nutrients stabilize the soil to guarantee the growth of wheat. The difference between the amounts of P, K, O.M., pH and EC of the BBFs with different ratio of controlled N are not different significantly. The BBF with controlled N ratio of 59% not only maintain the balance of rhizosphere soil pH but also guarantee the continual supply of soil nutrients to the growth of wheat.3. The BBFs of different controlled N ratio promote the growth of wheat at the whole stage. The BBFs with higher ratio can favorer the maintance of wheat growth traits than the others. The supply of nutrient of the BBF with controlled N ratio of 59% improves the growth of wheat from seedling stage to wintering stage and satisfies the nutrient command of wheat from jointing stage to harvesting stage.The yield of the BBF with controlled N ratio of 59% is singnificantly greater than that of the other BBFs by 9.56% and 12.4% as compared with the other treatments respectively. Its effect of increase production is significantly.4. The amounts of wheat ear, grain, yield and the N efficiency fall with the ratio of controlled N increasing. The BBF with controlled N ratio of 59% ehance the amounts of wheat ear and grain effectively. The yield and nitrogen efficiency of the BBF with controlled N ratio of 59% are greater than that of other BBFs significantly, which are 18.18%, 37.55%, as compared with CCF treatment, respectively. It improves the yield and N use efficiency effectively and reduces the depend rate of soil N.