Soil freezing study reveals crucial impact on water retention in agriculture.
The article explores how soil freezing and soil water retention are connected. The researchers studied the behavior of clay and silt soils when frozen and thawed, comparing it to when they are dried and wetted. They used various methods to measure the water content and pore water potential in frozen soil. The experiments showed that the matric potential in frozen soil differs from that in unfrozen soil at low water content. They also found that the freezing-point depression method may not be accurate for determining water retention in unsaturated soils with low water content. Additionally, experiments with salt solutions helped determine the osmotic potential and water retention characteristics. The study developed a relationship between adsorptive forces and water film thickness to describe soil water behavior when sorption is significant.