One of the most profitable crops in agricultural production in Ukraine as well as in the world is soybean. Its area under crops grows every year. However, the important condition for increasing of soybean gross harvest is increasing its crop capacity and improving of grain quality, including protein and oil content in it.
The aim of our research was to determine the impact of the complex of agents of chemical and biological nature to productivity of soybean crops and to define the quality of received yield. Experiments on the study of the effect of “Fabian” herbicide, “Regoplant” plant growth regulator and “Ryzobofit” microbiological agent in soybean crops of “Romantyka” variety on the formation of their productivity were done during 2013-2015 in field and laboratory conditions of Uman National University of Horticulture.
The article shows the results of researches on study of productivity and qualitative indices of received soybean yield under the effect of different norms of “Fabian” herbicide (90, 100 and 110 g/ha), ways of applying “Regoplant” plant growth regulator (250 ml/t – seeds treatment before sowing, 50 ml/ha – use while growing) and “Ryzobofit” microbiological agent (100 ml/t – seeds treatment before sowing). It was found that the level of soybean crop capacity increases compared with a control option under different norms and ways of applying of studied agents. The highest level of received yield was formed in the variant under the use of “Fabian” herbicide (90-110 g/ha) while seeds treatment before sowing with “Ryzobofit” (100 ml/t) and “Regoplant” (250 ml/t), where excess to control 1 was 56-53% and the effect of the same norms of “Fabian” applied by the variant of “Ryzobofit” 100ml/t + “Regoplant” 250ml/t in tank mixtures with “Regoplan” was 73-66%.
It was determined that protein and oil content increases significantly in comparison with a control variant in the variants with “Fabian” applying in the researches on the content of mass portion of protein and oil. Protein content in soybean seeds in the variants with “Fabian” 90, 100 and 110 g/ha increased to 0.8, 0.5 and 0.6% in comparison with a control variant I while in the corresponding variants of the research with a combine use with plant growth regulator to 1.1, 0.9 and 0.9% to dry substance. Received data give the grounds to affirm that the formation of a higher protein and oil content in the variants with use of research agents is the result of forming more favorable environment for physiological-and-biochemical processes in soybean and microbiological processes in soil.
Thus, integrated applying of “Fabian” herbicide (90 g/ha) in soybean crops in a mixture of “Regoplant” plant growth regulator (50 ml/ha) while seeds treatment before sowing with “Ryzobofit” (100 ml/t) and “Regoplant” (250 ml/t of seeds) promotes the highest crop capacity (2.2 t/ha) together with a simultaneous increase of grain qualitative indices (to 1.7% of protein and 1.8% of oil content). This is proof of activation of some biological processes in plants and soil that underlie in the formation of crops productivity.
Key words: soybean, herbicide, plant growth regulator, microbiological agent, crop capacity, protein content, oil content.