控释肥料养分释放动力学及其机理研究 第3报　土壤水分对包膜型控释肥料养分释放的影响(续完)  

Kinetics and mechanism of nutrient release from controlled release fertilizer-Part 3Effect of soil on moisture content on nutrient release of filmcoated controlled release fertilizer-Part Effect of

作　　者：肖剑[1] 郑圣先[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》2002年第6期9-12,共4页Phosphate & Compound Fertilizer

基　　金：湖南省"九五"重大科技项目(99NKY100407);农业部"九五"重点科技项目(95农0302);农业部"948"项目(991086)资助

摘　　要：研究包膜型控释肥料在不同温度和不同土壤水分含量(从田间持水量到较低的风干土壤水平)条件下的养分释放。并将土壤含水量换算成水蒸气压,再将土壤中控释肥料包膜内外的水蒸气压差换算成纯水蒸气压条件下的温度,代入ArataKobayashi改进模型,比较释放率的预测值与实测值,分析了土壤水分与释放速率的关系。结果表明,当土壤水分含量30%(田间持水量的100%),0.42MPa的土壤水势包膜型控释肥料的养分释放速率的实测值与预测值一致,低于这一水分含量的土壤,释放速率下降。土壤含水量2.3%(相当田间持水量的7.7%),土壤水势在100MPa以上时,包膜型控释肥料的养分完全不能释放。在低水分含量下的土壤渗透势对包膜型控释肥料养分释放的影响较小,影响养分释放的主要因子是基质势。The nutrient release of filmcoated controlled release fertilizer was studied at conditions of different temperatures and soil moisture contents. The conversation of soil moisture into water vapor pressure, then conversation of water vapor pressure difference between the outside and the inside of the coated film of controlled release fertilizer in the soil into temperature of water vapor pressure in pure water, estimated value and observed value was compared, the nutrient release was fitted with improved model proposed by Arata Kobayashi . Results show that the tested values of the nutrient release rate of filmcoated controlled release fertilizer at 30% of soil moisture agree with estimated value fitted with the improved model. However, the release rate decreases as soil moisture lows below this point, and became nil at 2.3% of soil moisture (7.7% of water holding capacity) content and 100 MPa of soil water potential. In the soil of low moisture content, effect of osmotic potential in soil water potential on nutrient release of filmcoated controlled release fertilizer is small, main factor affecting the nutrient release is metric potential.

关 键 词：控释肥料 养分释放 动力学 机理 研究 土壤水分 包膜型控释肥料 

分 类 号：TQ440[化学工程—化学肥料工业]