检索结果-南通市图书馆

Comparison of Seven kinetic Equations for k release and Application of kinetic Parameters

Pedosphere 2007年第1期17卷 124-129页

作者： Lü Xiao-Nan XU Jian-Ming MA Wan-Zhu LU Yun-Fu Institute of Soils and Fertilizers Zhejiang Academy of Agricultural Sciences Hangzhou 310021 （China） College of Environmental Sciences and Resources Zhejiang University Hangzhou 310029 （China）

Corn field experiments with two treatments, NP and NPk, where N in the form of urea, P in the form of calcium phosphate, and k in the form of kCl were applied at rates of 187.5, 33.3, and 125 kg ha^-1, respectively, on soils derived from Quaternary red clay were conducted in the hilly red soil region of Zhejiang Province, China. Plant grains and stalks were collected for determination of k content. Seven equations were used to describe the kinetics of k release from surface soil samples taken before the corn experiments under electric field strengths of 44.4 and 88.8 V cm^-1 by means of electro-ultrafiltration （EUF） and to determine if their parameters had a practical application. The second-order and Elovich equations excellently described k release; the first-order, power function, and parabolic diffusion equations also described k release well; but the zero-order and exponential equations were not so good at reflecting k release. Five reference standards from the field experiments, including relative grain yield （yield of the NP treatment/yield of the NPk treatment）, relative dry matter yield （dry matter of the NP treatment/dry matter of the NPk treatment）, quantity of k uptake in the NP treatment （no k application）, soil exchangeable k, and soil HNO3-soluble k, were used to test the effectiveness of equation parameters obtained from the slope or intercept of these equations. Correlations of the ymax （the maximum desorbable quantity of k） in the second-order equation and the constant b in the first-order and Elovich equations to all five reference standards were highly significant （P ≤ 0.01）. The constant a in the power function equation was highly significant （P 〈 0.01） for four of the five reference standards with the fifth being significant （P ≤ 0.05）. The constant b in the parabolic equation was also significantly correlated （P ≤ 0.05） to the relative grain yield and soil HNO3-soluble k. These suggested that all of these parameters could be used to estimate t

关键词： corn k release kinetic equation kinetic parameters

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

release of Soil Nonexchangeable k by Organic Acids

引用

Pedosphere 1993年第3期3卷 269-276页

作者： ZHUYONG－GUAN LUOJIA－XIAN InstituteofSoilScience AcademiaSinicaNanjing210008（China） InstituteofSoilScience AcademiaSinicaNanj

The amounts of soil nonexchangeable k extracted with 0.01 mL/ L oxalic acid and citric acid solutions and that with boiling 1 mL/ L HNO3 for ten minutes were remarkably significantly correlated with each other, and the amount extracted with the oxalic acid solution was higher than that with the citric acid solution. The soil nonexchangeable k release was comprised of two first-order kinetic processes. The faster one was ascribed to the interlayer k in outer sphere, while the slower one to that in inner sphere. The rate constants of the soil nonexchageable k were significantly correlated with the amounts of nonexchangeable k extracted with boiling ImL/ L HNO3 for ten minutes. Study on the fitness of different kinetic equations indicated that the first-order, parabolic diffusion and zero-order equations could all describe the release of soil nonexchangeable k. well, but Elovich equation was not suitable to describe it.

关键词： k release kinetics equations nonexchangeable k organic acid

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of Oxalic Acid on Potassium release from Typical Chinese Soils and Minerals

引用

Pedosphere 2007年第4期17卷 457-466页

作者： TU Shu-Xin GUO Zhi-Fen SUN Jin-He College of Resources and Environment Huazhong Agricultural University Wuhan 430070 （China）. Institute of Nuclear Agricultural Sciences Zhejiang University Hangzhou 310029 （China）

Oxalic acid plays an important role in improving the bioavailability of soil nutrients. Batch experiments were employed to examine the influences of oxalic acid on extraction and release kinetics of potassium （k） from soils and minerals along with the adsorption and desorption of soil k^＋. The soils and minerals used were three typical Chinese soils, black soil （Mollisol）, red soil （Ultisol）, and calcareous alluvial soil （Entisol）, and four k-bearing minerals, biotite, phlogopite, muscovite, and microcline. The results showed that soil k extracted using 0.2 mol L^-1 oxalic acid was similar to that using 1 mol L^-1 boiling HNO3. The relation between k release （y） and concentrations of oxalic acid （c） could be best described logarithmically as y = a ＋ blogc, while the best-fit kinetic equation of k release was y = a ＋ b√t, where a and b are the constants and t is the elapsed time. The k release for minerals was ranked as biotite 〉 phlogopite 〉〉 muscovite 〉 microcline and for soils it was in the order： black soil 〉 calcareous alluvial soil 〉 red soil. An oxalic acid solution with low pH was able to release more k from weathered minerals and alkaline soils. Oxalic acid decreased the soil k^＋ adsorption and increased the soil k^＋ desorption, the effect of which tended to be greater at lower solution pH, especially in the red soil.

关键词： Chinese soils k^+ adsorption and desorption k-bearing minerals k release oxalic acid

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Potassium Fractions in Soils as Affected by Monocalcium Phosphate,Ammonium Sulfate,and Potassium Chloride Application

引用

Pedosphere 2010年第3期20卷 368-377页

作者： WANG Huo-Yan, ZHOU Jian-Min, DU Chang-Wen and CHEN Xiao-Qin State key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China) [a] State key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences Nanjing 210008 (China)

Soil potassium （k） deficiency has been increasing over recent decades as a result of higher inputs of N and P fertilizers concomitant with lower inputs of k fertilizers in China; however, the effects of interactions between N, P, and k of fertilizers on k status in soils have not been thoroughly investigated for optimizing N, P, and k fertilizer use efficiency. The influence of ammonium sulfate （AS）, monocMcium phosphate （MCP）, and potassium chloride application on k fractions in three typical soils of China was evaluated during 90-d laboratory soil incubation. The presence of AS significantly altered the distribution of native and added k in soils, while addition of MCP did not significantly affected k equilibrium in most cases. Addition of AS significantly increased water-soluble k （WSk）, decreased exchangeable k （Ek） in almost all the soils except the paddy soil that contained considerable amounts of 2：1 type clay minerals with k added, retarded the formation of fixed k in the soils with k added, and suppressed the release of fixed k in the three soils without k added. These interactions might be expected to influence the k availability to plants when the soil was fertilized with AS. To improve k fertilizer use efficiency, whether combined application of AS and k was to be recommended or avoided should depend on k status of the soil, soil properties, and cropping systems.

关键词： fertilizers k availability k fixation k release

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：