A Preliminary Study on Natural Matrix Materials for Controlled Release Nitrogen Fertilizers  

作　　者：DUChang-Wen ZHOUJian-Min WANGHuo-Yan LIShou-Tian 

机构地区：[1]DepartmentofSoilScienceandPlantNutrition,InstituteofSoilScience,ChineseAcademyofSciences,Nanjing210008（China）

出　　处：《Pedosphere》2004年第1期45-52,共8页土壤圈（英文版）

基　　金：Project supported by the Innovational Project in Environment and Resources Fields from the Chinese Academy of Sciences (No. KZCX2-402) ; the National Natural Science Foundation of China (No. 39870431).

摘　　要：A controlled release N fertilizer was developed by the carrier method using natural polysaccharides (PS)and urea. The results showed that mixing of PS and urea led to significant control of urea release. When a cross-linker (boric acid or glutaraldehyde) was added, a better control effect was observed. During a 30 min leaching time the nitrogen release rate from the controlled release fertilizer was nearly constant, which was significantly different from normal urea. One of the controlled release mechanisms was related to space resistance from a large molecular structure. Infrared (IR) analysis indicated that interaction of PS with urea was through a hydrogen bond or a covalent bond. These bonds created an α-helix or high molecular network fertilizer carrier system, which was another reason for a controlled nutrient release. Pot experiment showed that nitrogen use efficiency could increase significantly with a carrier fertilizer.A controlled release N fertilizer was developed by the carrier method usingnatural polysaccharides (PS) and urea. The results showed that mixing of PS and urea led tosignificant control of urea release. When a cross-linker (boric acid or glutaraldehyde) was added, abetter control effect was observed. During a 30 min leaching time the nitrogen release rate fromthe controlled release fertilizer was nearly constant, which was significantly different from normalurea. One of the controlled release mechanisms was related to space resistance from a largemolecular structure. Infrared (IR) analysis indicated that interaction of PS with urea was through ahydrogen bond or a covalent bond. These bonds created an α-helix or high molecular networkfertilizer carrier system, which was another reason for a controlled nutrient release. Potexperiment showed that nitrogen use efficiency could increase significantly with a carrierfertilizer.

关 键 词：CARRIER controlled release fertilizer nitrogen fertilizer POLYSACCHARIDES 

分 类 号：S153.61[农业科学—土壤学]