Influence of Vympel 2 and Oracul multicomplex biopreparations and their mixture on spring barley (Hordeum L.) plants of different varieties

The study of mechanisms of biological preparations influence on the plants of agricultural crops in order to improve and regulate their growth is an urgent task in agroecology. So, the article presents the results of studies of changes in biometric parameters of spring barley plants depending on the effect of biological preparations Vympel 2, Oracle multicomplex and their mixture (Vympel 2 + Oracle multicomplex). The research was conducted on the basis of temporary field experiments (Skvyra research station of organic production of IAEM of the National Academy of Sciences) and at the department of agrobioresources and ecologically safe technologies in the laboratory of biocontrol of agroecosystems and organic production of the IAEM of the National Academy of Sciences. In the course of the work, it was determined that under the influence of the mixture of Vympel 2 + Oracul multicomplex preparations, spring barley plants of varieties Sebastian and Helios, in the phase of full grain maturity, were 10 cm taller compared to the option without treatment (control). This shows that the treatment of spring barley plants with microfertilizer and growth stimulator ensured an increase in the linear dimensions of plants in height in all phases of their development. It has been established that the influence of preparations Vympel 2, Oracul multicomplex and their mixture (Vympel 2 + Oracul multicomplex) enhances the formation of the assimilation apparatus, which improves the conditions for the growth and development of spring barley plants, both due to the stimulating properties of the plant growth regulator and the improvement of soil nutrition conditions from the side of microfertilizer, which affects the formation of high-yielding crops. It was analyzed that the ear length, the number of grains in the ear, and the mass of grains of spring barley plants changed under the influence of the preparations, which depends on the varietal characteristics of the plants and the stimulating effect of the studied preparations. The best results were obtained by using the Vympel 2 + Oracul multicomplex mixture on plants of the Sebastian variety, where the length of the ear was 2 cm higher, and the weight of the grains was 22 g heavier compared to the control variant.