Formation of seed productivity and sowing properties of Lotus corniculatus seeds depending on the effect of bacterial agents, growth regulators and anti-stress agents

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.