农药在植物表面上释放过程的研究

Study of the Release of Agricultural Chemicals on the Surface of Plants

研究农药在植物表面上的释放机理,建立农药释放的物理模型.分析不同机理控制下的介质移动和农药释放过程,对农药的由溶出机制控制的恒速释放药现象进行了解释.研究表明,农药与水介质移动速率的相对大小是控制农药扩散释放机理的主要因素.当水介质界面的移动速率大于农药通过凝胶层的速率时,农药的移动在整个过程中起决定作用;反之,界面层的移动在整个过程中起决定作用.当农药的移动速率和界面的移动速率即到达凝胶层时的速率相等时,两者共同发挥作用.

The mechanism that agricultural chemicals release on the surface of plants is studied and a physical model is established. The process of medium movement and agricultural chemical release under different controlling mechanisms is analyzed and the release with a stationary velocity controlled by the dissolution of agricultural chemicals is explained. The results show that the relative magnitude of moving speed between agricultural ehemicals and medium is a main factor to control the release of agricultural chemicals. If the moving speed of the interface of the medium is greater than the speed that agricultural chemicals pass through the gel layers, the whole process is determined by the movement of agricultural chemicals. On the contrary, the whole process is determined by the movement of the interface. If the speed is the same, both of them display their function.