Method for soil reinforcement using fine material and natural fibers. A method for soil mixture reinforcement for growing grass for sport applications, the soil mixture comprising soil, fine material and natural fibers, comprising the following steps: (a) excavating and removing the top layer of an original soil to a depth from 10 to 30 cm, (b) mixing the soil, fine material and natural fibers, being the natural fibers from 0.6% to 3% by weight of the dry sum of the soil and fine material weights, being the water from 8% to 20% weight of the total solid content of the soil mixture and being the weight ratio of fine material to soil from 1.2 and 19, (c) discharging the soil mixture obtained in step (b) and placing it in a location and (d) compacting the surface obtained after step (c).
