The study presents the results of plant green manure research of all kinds, it was determined that the best growth results were incorporated in the substratum of hydrogel, and particularly when it was entering clay soil, due to the amount of mois-ture in the substrate, clay soils more hygroscopic, and the use of hydrogel in accordance with its physical and chemical properties increases the moisture content of the substrate more significantly. Field germination on sowing variant clay over ground, in all cultures was significantly higher. The options for using the hydrogel showed greater plant density per 1m2. Almost all cultures have shown the greatest increase in ground plant parts in the appli-cation of the hydrogel with clay soil, plant height increased by 2.5 times. The exceptions were plant of rye, plant height difference on the ground vari-ants + clay + hydrogel and the hydrogel was less than 1 %. The increase in root length in the embod-iment using clay hydrogel substrates showed phacelia plant, which gave 2.5 times root growth. Rump Plants, on the contrary, increased the growth of root system in the application of the hydrogel in the crumbly soil in 43 %. In other variants the in-crease of the plant root length was observed. The increase in green mass of green manure crops in mixtures according to the variants of experiments is not much, whereas monoposeve sainfoin, Rump, buckwheat showed the greatest increase of green mass with respect to the control and other options. The greatest increase of green mass in options without making the hydrogel, the plants of all kinds of green manure gave on clay substrate, the fol-lowing variants stand out: sainfoin - 250 %, buckwheat - 172 %, rump - 123 % phacelia - 77.5 %. The best result for the accumulation of green mass was shown by sainfoin, buckwheat, rump, phacelia.