Influence of dry form of bacteria strains of the genus <i>bacillus</i> on garden strawberry in maternal plants

Abstract

In 2019-2022 in field experiments, stimulation of the survival rate and growth of mother plants of strawberries under the influence of pre-planting treatment with Fitop 8.1 (dry form) and Fitop 8.67 (liquid form) in working concentrations of 1 × 105 CFU / ml was proved: an increase in the survival rate of seedlings by 12.3 % and 19.5 %; an increase in the number of leaves by 29 % and 21 %; an increase in the length of the roots in both variants by 12.9 %; an increase in total plant biomass to levels of 92.9 g/plant and 94.5 g/plant. The biological effectiveness against strawberry white spot in the variants with Fitop 8.1 and Fitop 8.67 treatment was 33.1 % and 29.3м %, which is explained by the immunising effect of treatments on plants. The best effects of stimulating vegetative propagation were also noted in variants where the biological preparations Fitop 8.67 (liquid form) at a concentration of 1×105 CFU/ml and Fitop 8.1 (dry form) at concentrations of 1×105 CFU/ml and 1×106 CFU/ml were used for pre-planting treatment – the increase in the number of rosettes, on average, over three years, amounted to 3.0-3.9 rosettes/plant (20.6-27.3 %) relative to the control, where 14.4 rosettes/plant were formed, in average over three years of observation. The effects obtained in the biological product variants were at a statistically identical confidence level with the reference variant with the Phoenix humic preparation, 0.05 %. As a result, the yield of seedlings from an area of 100 m2 of the mother plantations increased significantly in the variants with Fitop 8.67 and Fitop 8.1 by 32.6 % and 55.9 % at 4229.5 seedlings/100 m2 in the control variant. In contrast, the effectiveness of Fitop 8.1 for seedlings, superior to Fitop 8.67 (liquid form) and the reference version with Phoenix, 0.05 %, has been proven.