Quantifying Mechanistic Detachment Parameters Due to Humic Acids in Biological Soil Crusts

Humic acid (HA) is a material that could be used to decrease erosion and improve soil structure. It also known biological crusts (biocrusts) have major role in stabilization, but the mechanism not well understood presence of HA, especially with mechanistic detachment rate parameters (b0 b1) Wilson model, where b0 dimensional parameter b1 threshold parameter. Therefore, this study intends (1) investigate effect different humic concentrations (0%, 4%, 8%) on b1,) Tigris Riversides Gheraiat region, Baghdad City, Iraq, crusted versus uncrusted soils using small scale model jet tests (mini-JET) at curing periods (1 week, 2 weeks, 3 weeks), (2) examine impact HA some characteristics, such as electrical conductivity, cation exchange capacity, organic matter for soils. Thirty-six undisturbed specimens (18 18 soils) were acquired from Riverbank. On these specimens, mini-JET was determine cohesive erodibility b1. The results showed value decreased up 60% an increase times until they reached their optimum values weeks. There no consistent pattern times. As concentration increased, 86% 99% soils, respectively. significantly improved reduced erodibility. This provides benefits adding stabilizer low-cost technique, which JET instrument.