膜控型缓控释肥料养分释放模型的研究  

The Nutrient Release Model of Film-controlled Slow & Controlled Release Fertilizer

作　　者：李延升[1,2] 张宝林[1] 张雪梅[3] 王斌[1] 

机构地区：[1]郑州大学化学工程学院,河南郑州450007 [2]许昌学院化学化工学院,河南许昌461000 [3]许昌学院图书馆,河南许昌461000

出　　处：《江苏农业学报》2009年第5期1033-1038,共6页Jiangsu Journal of Agricultural Sciences

基　　金：国家"十一五"科技支撑计划课题(2006BAD10B03-4)

摘　　要：根据菲克定律,运用数学物理方法,对膜控型缓控释肥料养分释放过程作了分析,建立了相应的数学模型并作解析。在分析水分及养分的质量传递过程的基础上,给出了单个肥料颗粒养分释放过程中每一步的养分释放速率、持续时间的关系式;解释了肥料颗粒群养分释放速率与时间的关系,即开始阶段释放速率很小,随后释放速率上升很快,再进入恒速释放阶段和减速释放阶段。通过该模型,提供了该类扩散控制过程处理及解析的一种方法。Applying mathematical physics method, the nutrient release process was analyzed in the case of film-permeable slow ＆ controlled release fertilizer based on Fick＇s law. The related mathematical model was constructed and resolved. On the basis of water and nutrient mass transfer analyses the expressions of nutrient-release rate and release time in each releasing step of single pharmaceutical particle were put forward. It was also made clear that the relation ship between nutrient-release rate and time of fertilizer group particles, i. e. at first the release rate was very small, then increased sharply, kept constant and reduced. This model provided a kind of dealing and analyzing method to this kind of diffusion-controlled process.

关 键 词：膜控型缓控释肥料 包膜层 偏微分方程 养分释放速率 养分释放时间 

分 类 号：TQ440.1[化学工程—化学肥料工业]