Due to biological characteristics of the varieties and their genetic potential, against the background of applying the main fertilizer under the cover crop, half of the norm of lime fertilizer Ca(OH)2 (fluff) – 1.2 t/ha in combination with the mineral fertilizers in the dose of N30P60K60 (control) on average for 2017—2018 a seed crop of hyacinth Ajax and Gelon 367 and 366 kg/ha was formed. The pre-sowing treatment of seeds of bovine Rhizobophyte with the bacterial preparation Rizobofit of the strain of the bacterium Mesorhizobium loti (0.15 l per hectare seed rate) contributed to the increase in seed productivity of the bovine Ajax and Gelon varieties by 78 and 87 kg/ha or 21.4 and 23.8 % compared to with control and amounted to 445 and 453 kg/ha, respectively, due to improved nitrogen nutrition of plants, an increase in the mass and number of nodule bacteria of the symbiotic apparatus on the root system of small cattle. It turned out to be effective to apply foliar nutrition of Lotus corniculatus in the stalking phases and additionally during the budding of plants with the anti-stress agent Agrogumat (0.4 l/ha), which ensured the average yield of Ajax and Gelon varieties from 464 and 467 kg/ha, or 97; 101 kg/ha or 26.6; 27.6 % more compared to control without foliar nutrition. It turned out to be less effective to apply foliar nutrition with the preparations Biosil (0.02 l/ha) and Aminokat 30 (0.6 l/ha). The greatest influence on the formation of generative organs (beans) was observed during foliar nutrition with anti-stress agent Agrogumat (0.4 l/ha). Its application on the fields of Lotus corniculatus in the stalking and budding phases was accompanied by an increase in this indicator by 37 and 51 units, or by 19.2—52.1 % compared with the control. The pre-sowing seed treatment of Lotus corniculatus of Ajax variety with the bacterial agent Rizobofit (strain of the bacterium Mesorhizobium loti) – 0.15 l per hectare seed rate positively influenced the development of nodule bacteria. This contributed to the formation of their greatest total number per plant: in the stalking phase – 174 pcs., the beginning of flowering – 241 pcs. Their mass in these phases was 311 and 1165 mg, respectively. Whereas in the control, without presowing seed treatment, these indicators were lower and amounted to 109, 209 and 120, 773 mg, respectively. The sowing properties of the seeds of Lotus corniculatus, in particular, the growth rate was the highest (56, 55 %) in the variants with foliar nutrition with the anti-stress agent Agrogumat, which was 7 % more compared to the control.

Purpose. To develop the element for regulating the formation of seed yield and the seeding properties of Bromus inermis through the application of Medax Top growth regulator from the time of tillering to the stem elongation of seed crops. To establish its effect on the growth of plants, their height, productive density, the number and mass of grains in inflorescences, the power of growth and seed germination. Methods. Field, visual, measuring, weight, quantitative, test sheaf method, laboratory, mathematical and statistical. Results. The results of scientific research aimed at creating favorable conditions for the formation of seed productivity of Bromus inermis and its seeding properties through the application of Medax Top plant growth regulator in the sixth-eighth period of organogenesis, i.e. from the beginning of tillering to the stem elongation of seed crops are presented. Its effect on increasing plant resistance to lodging, reducing plant height, increasing productive shoot formation, the number and mass of grains in inflorescence, improving seeding properties, in particular, the power of growth and seed germination, which contributed to the formation of seed yield of 343—354 kg/ha or 47—58 kg/ha more compared to the control without application of the plant growth regulator. Conclusions. Application of Medax Top plant growth regulator at the rate of 0.5—1.0 l/ha in the seed crops of Bromus inermis of Vseslav cultivar during the growing season is effective from the beginning of tillering to the stem formation, it contributes to an increase in its seed productivity by 5.0—21.2 % and provides conditional net profit of 5,179—5,288 UAH/ha.

Purpose. To theoretically substantiate methods for increasing the sowing and harvesting properties of hybrid clover seeds and develop innovative elements of energy-saving technology for growing it associated with feeding seed crops with mineral fertilizers and biological products to improve fixation of atmospheric nitrogen and mobilize macro- and microelements from the soil, reduce the stress state of plants during the growing season in critical periods of their growth and development, as well as providing livestock with highly nutritious cheap herbal feeds. To establish the features of the formation of sowing qualities of seeds, in particular, germination energy, germination capacity, growth force and mass of 1000 seeds. Methods. Field, visual, measuring, weight, quantitative, test sheaf method, laboratory, mathematical and statistical. Results. Modern innovative elements of energy-saving technology for growing seeds of a new adaptive hybrid clover Viliya variety have been developed in the conditions of the right-bank Forest-Steppe, which provides seed productivity of 275-353 kg/ha, due to improved plant nutrition in conditions of increased soil acidity (pH 4.8-5.2) by applying under the cover culture fast-acting types of calcium (hydrated lime – Ca(OH)2) 0.5 of the norm for hydrolytic acidity and mineral fertilizers N30P60K60, inoculating seeds with the bacterial preparation Rizobofit (strain of the bacterium Rhizobium leguminosarum biovar trifolii) – 0.15 l per hectare norm of seeds and foliar top dressing in the phase of stalking and budding with anti-stress agent Agrogumat – 0.4 l/ha. These conditions ensured high sowing quality of seeds, in particular, the weight of 1000 seeds was 0.84-0.85 g, germination and growth rate were 95 and 44-46%, respectively. Conclusions. In conditions of increased soil acidity, it is effective to apply high-speed calcareous fertilizers in the form of Ca(OH)2 (slaked lime) 0.5 of the norm for hydrolytic acidity and mineral fertilizers in a dose of N30P60K60 for cover crops (spring barley), in combination with presowing treatment seeds of the bacterial preparation Rizobofit (strain of the bacterium Rhizobium leguminosarum biovar trifolii) – 0.15 liters per hectare and foliar application twice in the phases of stalking and budding of crops with anti-stress agent Agrogumat – 0.4 l/ha. On average for 2017-2018. this ensured the maximum yield of clover seeds of the hybrid variety Viliya 304-314 kg/ha. The increase in seed yield was 66-76 kg/ha, or 28-32%, compared with the control.