The production process of peas (Pisum sativum L.) under the influence of Ryzohumin and biostimulants in the Southern Steppe of Ukraine

Abstract

Soil fertility deterioration and crop resistance weakening are among the undesirable consequences of the agricultural production intensifcation. The use of microbiological preparations and biostimulants complexes in the crops cultivation technology stimulates their growth processes, optimizes mineral nutrition, increases yields in adverse conditions. The paper aims to study the features of separate and joint influence of microbiological preparation Ryzohumin and biostimulants (Stimpo, Rehoplant) on growth, development, photoassimilating apparatus and yield formation processes in peas of Devis variety in the Southern Steppe of Ukraine. During the experiment, the number of root nodules was calculated, the leaf area index, the content of chlorophyll were determined, and the netto-photosynthesis productivity was calculated. The structural elements of the biological productivity of pea crops were recorded. It was established that the joint effect of Ryzohumin with biostimulants (Stimpo, Rehoplant) increased the number of root nodules on pea plants at different stages of the vegetation. The tested preparations increased the leaf area index of pea crops at maximum in 1.5 times during vegetative growth and in 1.6 times during generative development. The combined use of Ryzohumin with biostimulants allowed to form a larger area of the pea plants leaf surface than when was used in separate application. In the case of joint interaction of Stimpo with Ryzohumin, the productivity of nettophotosynthesis at the phase of 5–6 stipules-budding exceeded by 21–27 % and at the phase of flowering-bean formation exceeded by 7–14 % the best option with separate use of preparations. The use of Ryzohumin, Stimpo and Rehoplant resulted in an increase in the number of beans on plants by 22 %, 4 % and 11 %, respectively, and compared to the control. The obtained biological yield of peas under combined application of Ryzohumin with Stimpo exceeded by 12–14 %, and Ryzohumin with Rehoplant – by 6–11 %, comparing with the yield of pea crops, where the studied preparations were used separately. The obtained data confrm the future perspective to research of the pea crops productive processes under the influence of biological preparations. Key words: peas, biostimulator, Ryzohumin, Rehoplant, Stimpo, photoassimilation apparatus, yield.