The effectiveness of foliar application of polynutrient fertilizers on the nursery garden for growing grafted grape seedlings

The purpose of research is to study the effectiveness of foliar fertilization when growing grafted grape seedlings on a nursery garden in the conditions of the Rostov Region. The studies were carried out at the production complex and experimental field of ARRIV&W (a branch of FSBSI FRARC) located in Novocherkassk. The study examined the inclusion of foliar application of modern complex fertilizers of the following names: Bio-Don 10 Fe (0.2 %); Beres (0.05 %); Juss Argentum Agro (0.2 %); Helios Boron Molybdenum (0.3 %); Nano Silicon (0.06 %); Fertigrain Foliar (0.2 %) in the technology of growing grafted seedlings of the technical white grape variety Sibirkovy (rootstock Kober 5 BB). The development of the main biometric indicators of the annual growth of the experimental variants using fertilizers increased significantly in comparison with the variant without additional treatments (control) by: 45.0-189.7 cm along the total length of the increase (LSD05=32.84); 23.7-104.7 cm along the length of the hardwood part (LSD05=15.46); 2.7-29.4 % on aging (LSD05= 6.37); 0.2-4.0 mm in diameter (LSD05=0.75); 693.1-5101.5cm2 of the leaf surface area (LSD05=630.76). The survival rate in the control was 22.4%, and when using fertilizers, it increased to 32.4-51.9 %, which is significant for LSD05 = 1.4. The yield of seedlings in the control was the lowest (19.0%), non-root treatment increased the bottom indicator to 27.5-44.1 %, which is significant at LSD05= 1.31. An increase in the multiplicity of foliar fertilization (Bio-Don 10 Fe; Beres; Helios Boron Molybdenum; Nano Silicon; Fertigrain Foliar) from 2 to 4 times increased the survival rate by 1.4-14.8 %, and the yield of seedlings by 1.2-12.5 %. Correlation analysis showed positive linear dependencies: 1 - increase in the diameter of the increment with an increase in the multiplicity of processing (r=0.589); 2 - increase in survival rate and yield of seedlings with an increase in the frequency of processing (r = 0.659).