Release Kinetics of Herbicide in Fertilizer-herbicide Granules with Effervescent Characteristics
HUA Quanxian1,2, HU Bin1, TANG Jianwei1, LIU Yong1, WANG Lisuo1
1. National Centre of Research & Popularization on Calcium, Magnesium, Phosphate and Compound Fertilizer Technology, School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou 450001, China;2. State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
Abstract：The fertilizer-herbicide granule with effervescent agent coating was prepared to increase the herbicide release rate. The effervescency of the granule enjoys a remarkable performance, which was evaluated with the methylene blue spectrophotometric method. The experiments revealed the release kinetics of mefenacet and bensulfuron-methyl (BSM) in the granule. The results show that the release equilibration time of mefenacet and bensulfuron-methyl in the effervescent granule is 15 and 11min, respectively, 33.3% and 36.7% of that in the common fertilizer-herbicide granule. The release kinetics of mefenacet and bensulfuron-methyl follows the dual constant equation and Logistic equation, with a correlation coefficients highly significant (P< 0.001). Their release rates are controlled by the Boyd film diffusion model and the Kannan-Sundaram intraparticle diffusion one.