Morphological Changes of Above-Ground Internodes of Spring Barley Plants Depending on the Seeding Rate and Foliar Top Dressing

Abstract

To determine the complex influence of the seeding rates and foliar top dressing on modification changes of above-ground internodes of spring barley plants. Methods. Field, measuring, analysis, generalization, statistical. Results. Morphological changes of above-ground internodes under the complex influence of the seeding rate and foliar top dressing were established and analyzed. The length of the three lower internodes increased with an increase in the seeding rate, and the two upper ones decreased. Among the types of foliar top dressing, the elongation of the upper internodes, compared to the control, was provided only by the type in which the crops were treated in the tillering and stem formation phase. With an increase in the seeding rate, the dry mass of a centimeter segments of all internodes and their diameter decreased. The seeding rate had a greater impact on the variability of vertical resistance indicators of spring barley plants. Thus, the range of divergence in the plant resistance index against lodging under its influence was 18.0 %, and under the influence of foliar top dressing it did not exceed 2.0 %. Conclusions. Change of the density of plants and carrying out foliar top dressing with a biostimulator-antistressant allow you to control the parameters of above-ground internodes of spring barley. The seeding rate from 350 to 450 pieces/m² ensures the formation of crops with a sufficiently high resistance to lodging. If the seeding rate increases over 450 pieces/m² there is a decrease of indicators in the resistance of spring barley plants to lodging, which is associated with the elongation of other internode at samultanious reducing its diameter due to greater competition between plants. The experiment established a high efficiency of two foliar top dressing of crops with a biostimulator-antistressant ‒ Vuksal Aminoplast to increase the vertical resistance indicators of spring barley plants, primarily by increasing the diameter of the lower internodes.