Thermodynamic Properties of NH4+ Fixation in Manured Loess Soil in Shaanxi Province, ChinaEnglish Full Text
FAN XIAOLIN;ZHANG YIPING(Soil Science Department, Northwestern Agricultural University, Yangling 712100, Shaanxi China)JUANG TZOCHUAN(Research Institute of Soil Science, National Chung-Hsing University, Taiwan China)ZHANG FUSUO(Department of Plant Nutrit
Abstract: Some thermodynamic properties of NHk fixation by loess soil in plowing and clay layers are discussed.The. results indicate that the four ion adsorption equations commonly used can describe the properties of NHk fixation in these soils under constant temperature. Among the four adsorption equations, the singlesurface Langmuir equation is the best. When the concentration of NH4Cl solution is 10-1 mol below, the Freundlich equation can be used.The changes of apparent standard free energy （△Go）, enthalpy （△Ho） and entropy （△So） illustrate that NHk fixation in soil is an endothermic adsorption and spontaneous reaction, and the process can be enhanced by a higher temperature and clay content in soil.The "proper value of NHk fixation by soil （K1×qm） increased with increasing clay content and temperature. The heat of NHk fixation in soil （Qm） confirms the conclusions made in this paper.
- Series：
(D) Agriculture
- Subject：
Fundamental Science of Agriculture; Agronomy
- Classification Code：
S152
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