ВНУТРИИ МЕЖСОРТОВАЯ ИЗМЕНЧИВОСТЬ СОИ (GLICINE MAX L.) ПО НЕКОТОРЫМ ЭЛЕМЕНТАМ СТРУКТУРЫ УРОЖАЯ

Yield structure elements were studied in the two recognized varieties and five promising selection numbers of soybean of the Siberian ecotype under conditions of severe drought in 2012. Intravarietal and intervarietal variation in this index is shown. A contribution of varietal diversity to total variation of each yield structure element was determined by the method of variance analysis. The structural analysis provided opportunities to select individual plants and form lines with the optimal combinations of yield structure elements. Modern and newly developed soybean varieties are polymorphic by these indices. Variation amplitudes in yield structure elements are influenced by genotype and modifying factors. The analysis of yield structure elements allows us to carry out individual selection of soybean plants with the maximum degree of manifestation of yield structure traits and to develop lines having a certain set of traits. The influence of droughts on yield structure elements in soybean specimens is of varied character. As influenced by moisture deficiency was observed an increase in the number of seeds per plant and thousand-kernel weight in the selection number SNK-147.