旱地土壤条件下包膜控释肥料养分释放的试验与数学模拟  

Experimental study on nutrient release from coated controlled release fertilizer in the upland soil condition and its mathematic simulation

作　　者：郑圣先[1] 肖剑[1] 易国英[1] 

机构地区：[1]湖南省土壤肥料研究所,湖南长沙410125

出　　处：《磷肥与复肥》2006年第2期16-21,共6页Phosphate & Compound Fertilizer

基　　金：国家自然科学基金资助项目(30270770);农业科技成果转化基金项目(02EFN214301156);湖南省农科院重点学科项目(0305)资助

摘　　要：采用室内培养方法,测定了不同土壤水分含量条件下指数线性和S线性包膜控释肥料养分释放速率。计算出不同土壤含水量条件下养分释放速率常数(k)。该k值与土壤在最大持水量30%时的k值的比值定义为释放速率系数a,并用土水势(Ψ)的函数表示。分别建立不同旱土水分含量条件下指数线性和S线性包膜控释肥料养分释放数学模型。结果表明,这两个数学模型能够较好地模拟指数线性和S线性包膜控释肥料在自然旱地条件下,任一日变化土温和任一日变化土壤含水量下的氮素释放率,模拟值与实测值基本一致,表明这两个数学模型具有实用性。Incubation method in the laboratory is used to determine the nutrient release rate for linear and sigmoidal film- coated controlled release fertilizers, and the release constant （k）is calculated from the nutrient release data with different soil moistures. The release rate coefficient（α）is defined as the ratio both k values under the each soil moistures and 30% moisture, and expressed as a function of soil moisture potential（ψ）. Mathematic models of linear and sigmoidal film- coated controlled release fertilizer in different soil moisture conditions are developed respectively. Results show that release values simulated with some daily changed soil moisture content and some daily changed soil temperature in the natural upland field, agree well with the measured release values. The two mathematic models are useful in practice.

关 键 词：旱土 包膜控释肥料 养分释放 数学模拟 

分 类 号：TQ440.2[化学工程—化学肥料工业]