Influence of preparations on photosynthetic activity of brewing barley (Hordeum vulgare L.) plants and quality indicators of grain

Abstract

Plant growth regulators and microfertilizers stimulate the accumulation of chlorophyll by plants, increase the photosynthetic activity of chloroplasts and the net productivity of photosynthesis, and contribute to increasing the resistance of crops to diseases and adverse environmental factors. The aim of the work was to study the effect of preparations on the photosynthetic activity the plants of spring barley varieties in order to achieve the proper quality of the grown products. In the research, barley plants of the spring brewing direction of the varieties Sebastian (Seyet Planteforedling I/S, Denmark) and Salomi (SAATEN Union, France) were used, which were treated with plant growth stimulator Vimpel 2, complex microfertilizer ORACUL multicomplex, a mixture of Vimpel 2 + ORACUL multi-complex and control area — water treatment. The article presents the results that show that the content of the sum of chlorophylls a and b in spring barley leaves under the influence of preparations Vimpel 2 and ORACUL multicomplex plays a major role in increasing the productivity of the crop. Accumulation of protein and starch in spring barley grains is one of the most important indicators for growing varieties of brewing value. In all variants of the study, the accumulation of protein in the grain turned out to be within acceptable limits for malting barley (8.75–10.02%), only in the control variant it remained too low. The use of preparations Vimpel 2 and ORACUL multicomplex in a mixture contributes to the accumulation of starch in spring barley grains of both studied varieties. At the same time, treatment with only growth promoter or only micro-fertilizer stimulates the accumulation of starch in the grain compared to the control, but remains at a low level for the brewing industry. The most active growth of the assimilation surface of spring barley plants in all phases of growth was observed after treatment with Vimpel 2 mixture in combination with ORACUL multicomplex. The conducted studies established a significant influence of microfertilizers and growth stimulants on the photosynthetic potential of spring barley crops. During the entire vegetation period of spring barley, the highest photosynthetic potential of crops (FPP) — 859.2 m2/ha×day was determined in the Sebastian variety with the addition of microfertilizer and growth stimulator. The high-quality work of the leaf apparatus of plants is determined by the net productivity of photosynthesis (NPP). The highest PPF index was observed on the Sebastian variety in the variant treated with a mixture of microfertilizer and growth stimulator, which is 27% higher than in the control variant. Therefore, spring barley grain of the required quality can be obtained only under the conditions of optimal combination of the use of preparations of different spectrum of action.