Biological soil crusts (biocrusts) are generally found in many landscapes. Biocrusts are known to have a key role in terms of soil stabilization but the mechanism of biocrusts is poorly understood. Thus, this work intends to examine the impact of two biocrusts: Cyanobacteria and Chlorophyte, on parameters of cohesive soil erodibility (erodibility coefficient, kd, and critical shear stress, τc) using a small-scale form of Jet Erosion Test (mini-JET) at different drying times. In addition, the study aims to develop relationships between τc and kd versus certain soil characteristics. Eighteen undisturbed soil samples of two biocrust types Cyanobacteria, and Chlorophyte, and bare soils were acquired from the banks of the Tigris River in Iraq, and were tested in a laboratory using a mini-JET at drying times of 5, 8, and 12 days, in order to mimic field conditions. It was observed that dead algae still adhered to and bound soil particles together throughout the observation period, which contributed to soil stability, and increased moisture and nutrient retention before decomposition. As the drying times increased in the two biocrusts, the statistical results showed a reduction in kd, while τc values increased. The kd decreased as salt concentration, organic matter, and calcium carbonate increased, while the τc increased. No change in pH levels of soil was observed due to the reactions in the biocrusts between the algal crust and soil particles, which increased organic matter and calcium carbonate. This study discusses the benefits of using a JET instrument; including reducing testing time, conserving energy, and providing low-cost method for observation of crusted soil stabilization, in comparison with previous techniques.