Agriculture and forestry

Didur Ihor – Candidate of Agricultural Sciences, Associate Professor, Dean of the Faculty of Agronomy and Forestry of Vinnytsia National Agrarian University (21008, Vinnytsia, Soniachna Str. 3, е-mail: didurihor@gmail.com).

The variability of weather conditions and the high cost of mineral fertilizers lead to the search for alternative approaches to the optimization of existing and the development of new technological techniques for growing agricultural crops, including soybeans.

This article presents the results of research on the study and analysis of the regularities of the height formation of soybean plants of the Madison variety and its average daily linear growth depending on the pre-sowing treatment of seeds with preparations based on active strains of nodule bacteria (Bradyrhizobium japonicum), namely Bioinoculant BTU, Rizolain + Rhizosev, Anderiz and foliar top dressing with biological fertilizers Biocomplex BTU, Gumifrend and Helprost soybean.

On the basis of the conducted observations and records, it was established that in the conditions of the right-bank forest-steppe on gray forest soils, the studied preparations of biological origin had a direct effect on both the dynamics of plant height and average daily growth.

The maximum height of the plants in the experiment was 78.3 ±7.4 cm, in the phase of physiological maturity, was formed on the variant of the experiment where pre-sowing treatment of seeds with the preparation Biokompleks BTU and foliar fertilizing in the phase of the 3rd trifoliate leaf and budding with organo-mineral fertilizer Helprost soybean was carried out ( 2.5 l/ha), which is 13.3 cm or 20.4% more compared to the control. Another important indicator that characterizes the peculiarities and rates of growth and development of soybean plants during the growing season is the average daily linear increments of the stem. The highest average daily linear growth of soybean plants - 0.65 - 0.66 cm/day, was recorded on the variants of the experiment, where soybean seeds were inoculated with Bioinoculant BTU and Anderiz in combination with foliar feeding of organo-mineral fertilizer Helprost soybean.

After conducting a correlation-regression analysis, it was noted that there is a strong positive relationship between plant height indicators and the amount of precipitation during the growing season of soybean plants, while the correlation coefficient was r = 0.805.

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