%A WU Yanyou,,, HU Linsheng,, GU Ruizhi,, WU Yansheng,, LI Minghong,ŠĪ %T The relationship between soil water potential and water content of two soils %0 Journal Article %D 2017 %J Journal of Drainage and Irrigation Machinery Engin %R 10.3969/j.issn.1674-8530.16.0027 %P 351-356 %V 35 %N 4 %U {http://zzs.ujs.edu.cn/pgjx/CN/abstract/article_2219.shtml} %8 2017-04-25 %X Soil moisture characteristic curves of the two species of soils were researched. Based on the Gibbs free energy,the model of soil water potential and water content was founded. As loam and loam clay were two common soils, the relationship between soil water potential and moisture losing time with four soil water levels was monitored, and Logistic equation was used to fit the relationship between soil water potential and water content. The results showed that the established model based on Gibbs free energy was quite feasible since the relationship between soil water potential and moisture losing time can be well fitted by Logistic equation. And the relationship between water content(calculated by the model of soil water potential and water content)and moisture losing time can be well fitted with Logistic equation. The field water capacity of loam clay was 11.6% higher than that of the loam. However,the time point when water content of loam decreased to wilting moisture was later than that of the loam clay, which indicated that the water-holding capacity of the loam was obviously higher than that of the loam clay. This research could provide the real-time irrigation technical support for the information of crop water demand.ŠĪ