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

来源 :土壤圈 | 被引量 : 0次 | 上传用户:binhaiwz_2009
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
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.
其他文献
The relationship between temperature and oxygen vacancy concentration is deduced in this paper. Based on the data of thermal weight-loss experiment, the formati
The authors give an algebraic method to add uniton numbers for harmonic maps from a simply connected domain Ω R2 ∪ {∞} into the unitary group U(N) with finit
A method using carboxymethyl-β-cyclodextrin(CM-β-CD) as selector for chiral separation of amino acids by capillary electrophoresis and laser-induced fluoresce
An amphiphilic graft polymer, (PAM-g-PBA), polyacrylamide (PAM) having poly(n-butyl acrylate) (PBA) side chains, was obtained by radical copolymerization of acr
A simplified theoretical method based on the quasi-steady wing theory was proposed to study the unsteady aerodynamic forces acting on an airfoil flying in non-u
The title compound 2,2-pentamethylene-1,2,3,4-tetrahydroquinazolin-4-one is of monoclinic, space group P21/n with a = 10.387(1), b = 10.954(2), c = 10.827(2)A,
The nucleophilic displacement reaction of n-bromooctane and potassium iodide in ionic liquid based on cyclic guanidinium cation(2) was investigated. The kinetic
The facile synthesis of 16-hydroxygeranylgeraniol(1), a naturally existing alicyclic diterpene, by alkylation reaction of allylic iodide(3) with phenyl sulfone(
The study of controlling high-current proton beam halo-chaos has become a key concerned issue for many important applications. In this paper, time-delayed feedb
The influence of adding Fe, Cr, Co, and Ga into 3%Mo/HZSM-5 catalyst on methane aroma-tization, and the influence of additives ratio on methane conversion, sel