The aim of the work is to substantiate the geometric parameters of the distributor, which are able to provide the maximum range of fertilizer particles in the subclavian space, based on the analysis of all factors affecting the material particles during their transportation to the surface of the distributor. The result of research is to achieve a uniform distribution of fertilizers on the width of the capture and, accordingly, on the area. It is known that the particles of material sent in accordance with the given trajectories in the pre-provided areas of the surface of the furrow formed by the working body, in contact with the soil are significantly redistributed and the meaning of the traditional approach to uniformity is completely lost. In addition, it is necessary to take into account that for placing fertilizers in the soil, in most cases, flat-cutting working bodies are used. For normal operation, in terms of deepening into the ground, they must be installed with a forward tilt at an angle of up to 3°. As a result, the bottom of the furrow, which they form, acquires a conical shape with a slope to the center. In this case, it becomes obvious that the material must be fed not evenly across the width of the working body, and most of it to be directed at a clearly defined distance in the direction perpendicular to its axis. The numerical value of this distance is determined by the nature of the redistribution of the granules as a result of contact with the soil. In the process of rolling the granules or particles to the center, the uniformity of distribution will be restored. In this case, it becomes obvious that the material must be fed not evenly across the width of the working body, and most of it to be directed at a clearly defined distance in the direction perpendicular to its axis. The numerical value of this distance is determined by the nature of the redistribution of the granules as a result of contact with the soil. In the process of rolling the granules or particles to the center, the uniformity of distribution will be restored. In this regard, there is a need to solve the problem of ensuring the maximum range of particles in the transverse direction using the simplest geometry of the distributor surface. In our opinion, such a surface can be a prism. In the article the results of theoretical research of process of portage and distributing of granules of mineral fertilizers are resulted after a reflection from the plane of reflection in sub paw space of trivial cutting of working organ. Geometrical parameters and corners of location of reflecting plane are grounded. The obtained dependences allow to reasonably establish geometrical parameters of the distributor which will provide the set range of flight of particles of material for working bodies of various width of capture and to reach desirable result taking into account laws of their redistribution at contact with soil.