MODELS OF SOIL WATER CHARACTERISTICS CURVES: A REVIEW

Soil water characteristic curve (SWCC) is very important in the study of unsaturated soil because it represents a soil’s ability to store and release as subjected various suctions. This storage moisture paramount irrigation engineering, determines scheduling dryland. reviews some SWCC model’s performance predict from selected soils Nigeria previous work. work contains 7 points between 0 – 1,500 kPa. Seki, which bimodal, tends perform better than rest with R2 value 0.99. Generally, bimodal models performed unimodal, due flexibility curve. However, removal reference point 1,000,000kPa (leaving points), all unimodal had good topsoil. Fredlund Xing best van Genuchten poorly subsoil. Also, was observed increase both organic matter contents electrical conductivity, decreased. From this review, observable that analysis 8 or more 3 Seki’s model can be used respectively for further research dryland