Abstract
This paper examines the effect of N-(1-ethynylcyclohexyl)amide O,O-diethylphosphoric acid (BA-4) on seed germination, growth and yield of the agricultural crops (carrot, beetroot, potato). As a result, seed germination in the concentrations of 0.001 and 0.0001% of BA-4 has increased by 7.0 and 19.0%, compared to the control. The results of the laboratory studies have shown that the treatment of with the BA-4 (0.0001% solution) has increased the seed germination energy by 11.0 and 17.0%, respectively. The HAU standard (0.06%) has increased the germination energy by 9.0% and germination by 10.0%. The results of the laboratory studies have shown that the use of BA-4 for treating the tubers has increased the number of awakened buds by 43.0% (0.001%) and 60.0% (0.0001%), compared to the control. When using BA-4 in the concentration of 0.001%, the carrot yield has increased by 3.5 t/ha or 15.9%, and in the concentration of 0.0001% - by 5.0 t/ha or 22.7%. When beetroot seeds were treated with the BA-4 preparation at a 0.0001% concentration, the yield increase compared to the control was 6.3 t/ha or 24.2%. The potato yield has increased from the use of BA-4 in concentration of 0.001% by 4.3 t/ha or 18.9%, compared to the control; in the concentration of 0.0001% - by 7.3 t/ha or 32.2%. The achieved results of increasing the yield of BA-4 are an effective stimulation of plant growth and development, contribute to an increase in the yield and ensure the compliance with the agricultural crop indicators.