FORMATION OF SYMBIOTIC APPARATUS OF LENTIL UNDER THE INFLUENCE OF BIOLOGICAL PREPARATIONS

Nowadays the biologization of agriculture is the global tendency, which scientific basis is the grain legumes introduction into the crop rotation and deepening of knowledge about the importance of soil microorganisms in the atmospheric nitrogen fixation and formation of natural soil fertility. In view of this, the prospect of effective microbial preparations use in the grain legume crops growing technology significantly increases as evidenced by the results of numerous studies. The article presents the results of the research on the study of the peculiarities of the symbiotic apparatus formation of lentil plants under the influence of the gel form of the microbial preparation (Rhizobium leguminosarum biovarviceae K-29 strain) and the plant growth regulator Regoplant (250 ml/t – a pre-sowing seed treatments; 50 ml/ha – a postemergence treatment). The effectiveness of the rhizobium-legume symbiosis was estimated during the budding stage, flowering stage and bean-filling stage on the plants of Linza lentil variety. The number and weight of tubercles on the crop root system were determined according to the method described by V.V. Volkogon, and the leghemoglobin content in the tubercles – according to G.S. Posypanov. It was established that in the complex use of the investigated preparations on the root system of lentil there is an increase in the number and weight of tubercles and the leghemoglobin content in them. In 2014 and 2018 the tendency for the most active formation of the lentil symbiotic apparatus in variants for pre-sowing seed treatment with a mixture of microbial preparation (Rhizobium leguminosarum biovarviceae K-29 strain) and plant growth regulator Regoplant (250 ml/t) was observed, followed by the postemergence application of the latter in the normal range of 50 ml/ha. On average, over the years of research in this variation of the combined use of biological preparations, the number of tubercles exceeded the control depending on the phase of crop development by 95 – 283 %, the weight — by 194 – 412 % and their leghemoglobin content by 230 %