Srudies On Granular Coaed Herbicide-containing Compound Fertilizer Compatibility Features And Allometric Diffusion Process

Medicine fertilizer was a compound-type fertilizer with integrative functions by the combination of pesticides and fertilizers. In addition, allometric herbicide medicine fertilizer was the combination of herbicide and slow-release fertilizer. This kind of fertilizer in the study could not only increase the diffusion rate of herbicide and slow down the release rate of fertilizer nutrients to enhance the utilization rate of fertilizer and herbicide, but also reduce herbicide residues to protect the environment and cut down production costs. In this paper, it studied on the compatibility of bensulfuron-methyl and benzene thiophene acyl amine with several comprehensive analyses was done on packing structures and adsorption characteristics of herbicides on chemical fertilizers. On the basis of exploring the properties of disintegration materials, it prepared the herbicide medicine fertilizer with effervescent characteristics in which urea particles were the cores. In addition, medical stone, talc and white clay were coating materials and citric acid and potassium carbonate were the collapse of materials. The production process and conditions of herbal fertilizer was be fully studied and optimized then the effervescent effect could be directly showed off by colorants instead of herbicides. And on the basis of effervescent herbicide medicine fertilizer, the paper prepared the allometric herbicide medicine fertilizer and studied the mechanisms of release of its medicines and nutrients in order to provide a theoretic and practical basis for the further research and application.The results were listed as follows:(1) Studying on the compatibility of bensulfuron-methyl and benzene thiophene acyl amine with several common fertilizers. According to the principle of mixing pesticide and fertilizer, herbicide and fertilizer were mixed after being dissolved, then held these samples on test bed at a constant temperature. The results show that bensulfuron-methyl mixed with ammonium dihydrogen phosphate and benzene thiophene acyl amine mixed potassium chloride all could reduce drug effects. Then bensulfuron-methyl and benzene thiophene acyl amine could mix with other common fertilizers. (2) the paper discussed the effect of coating materials which were medical stone, talc and white clay on particle properties and the adsorption of herbicide. And the effect of collapse materials on the properties of fertilizer was also discussed. Most properties of medical stone, talc and white clay such as main component, particle size distribution and specific surface area were also studied. The adsorption properties of benbbensulfuron-methyl and benzene thiophene acyl amine in medical stone were investigated respectively, which was made contrast with the adsorption of the same systems in talc and white clay. And talc and clay in the adsorption were compared. The results showed that white clay> talc>medical stone.(3) It was studied the conditions of preparation of herbicide medicine fertilizer with effervescent additives in the lab. And the collapse of time, particle strength and package rate were all investigated, it prepared the coating particles in disc granulator with the core of urea particles by changing the conditions, such as the binder, concentration, the different proportion of coating material in the parcel layer, the mass ratio of collapse materials.The best results showed that coating material in the parcel layer is 5%, the concentration of binder is 0.2%, the mass ratio of collapse materials is 10.4%.(4) The rapid release properties of effervescent granules was directly measured and analyzed. In the system of parcel granulation, methylene blue dye instead of herbicides was wrapped in effervescent granules. And the results showed that effervescent effect is good for the rapid diffusion of herbicide.(5) In this paper, the preparation process of allometric herbicide fertilizer was investigated. And the release mechanism of herbicides and nutrients in this fertilizer was also studied. The best results from the water immersion test showed that the concentration of binder is 60%, coating material is 10%, the coating time is 10min. The banlance times of bensulfuron-methyl and benzene thiophene acyl amine 10min in water are 10 min and 15min which are one third of common granular. However release rate of nutritious parts of herbicide fertilizer is 12 times than that of common fertilizer. The mathematical logistic models about release of herbicides and nutrients were established in order to prove the characteristic of different release rates of herbicides and nutrients in the fertilizer.