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Mulcher seeder with mechanical seeding of seeds equipped with tine coulters do not fully ensure uniform distribution over the width of the opener. The best nutritional conditions of the plant are obtained with the subsoil-dispersive method of sowing. A scheme of a coulter with a two-plane grass seed spreader, which provides a subsurface-spread method of sowing is proposed. The movements of grain in the understock space of a plow coulter were described by the numerical methods in the Mathcad program. Theoretical studies determined the influence of various factors on the particle trajectory and established the laws of the seed distribution process. Laboratory studies have determined the main design parameters of a two-plane grass seed spreader. The results of scientific research served as the basis for the development of a two-plane grass seed spreader of a tine coulter. To confirm the reliability of theoretical and experimental study results conducted field tests. For field tests on the planter experimental tine coulters with a two-plane spreader are installed. After 100% of the emergence of seedlings in field conditions the uniform distribution of plants was determined. The uniform distribution of seedlings was determined by a frame with a size of 1000x1000 mm with cells measuring 50x50 mm. The frame was superimposed on the seedlings and counted the number of seedlings in each cell. As a result of the sowing analysis the uniform distribution over the width of the coulter and the feeding area was determined. The two-plane spreader for subsoil-free sowing is intended for the modernization of tine coulter stubble seeders with mechanical seeding of SZS-2.1M and SKP-2.1 type seeds. The coulter equipped with such a spreader ensures the sowing process with higher quality indicators of the uniform distribution of seeds, which allows to obtain a yield increase of 10 … 12%.