И. В. Горепекин The colloidal component of soils affects many soil properties, including water retentivity. To reflect the structure of the colloidal component, the term “gel films” was introduced in the 1930s-1950s. A diagnostic property of gels as colloidal systems is their ability to coagulate and peptize – processes that determine the mobility of colloidal particles. The study aimed to investigate the effect of soil gel mobility and their components on soil water retentivity. The research was conducted on samples of grey forest soil and leached chernozem. Soil water retentivity was determined using the equilibrium centrifugation method, while the mobility of colloidal particles was assessed by measuring the optical density of soil extracts. The experimental results showed that soil drying significantly reduces its water retentivity compared to freshly sampled soil. Adding an ammonia water solution to air-dry samples increases the negative charge of humic substances in the soil and enhances their mobility. This is confirmed by an increase in the optical density of soil extracts as the ammonia water solution concentration rises. As the mobility of humic substances increases, soil water retentivity enhances. The findings suggest that water retentivity can be increased not only by adding water-retaining components, but also by using substances that help block soil capillaries.
Научная статья 
почвенные гели