Features of yield formation in samples of spring soft wheat of Siberian selection in the conditions of the Krasnoyarsk forest-steppe

The aim of the study is to reveal the strength of the relationship between structural elements and yield in samples of spring soft wheat of Siberian selection of different ripeness groups. Field experiments were carried out at the Minino industrial farm of the Krasnoyarsk Research Institute of Agriculture in 2017-2019. The starting material is represented by 33 samples. It was divided according to the duration of the growing season into 2 groups: 1 - earlyripe, midearly; 2 - midseason, midlate. For the studied groups of ripeness, there are features in the formation of productivity and the tightness of the correlation between the elements of the structure.The formation of the yield of midearly examples depended on the duration of the vegetation season (r = 0.836) and the sprouting heading interphase period (r = 0.659). A significant contribution to its formation was made by the mass of the main spike (r = 0.761) and the mass of 1000 grains of lateral shoots (r = 0.717). The duration of the vegetation season had a decisive influence on the formation of the total mass from the main spike (r = 0.828) and the mass of lateral shoots (r = 0.656). The sprouting - heading interphase period showed the greatest number of positive correlations with quantitative traits. It influenced the duration of the vegetation season (r = 0.742), plant height (r = 0.545), grain mass of lateral shoots (r = 0.723), number of grains in the main spike (r = 0.558) and lateral shoots (r = 0.540). The duration of the interfacial period heading wax ripeness had a negative relationship on the formation of productive shoots (r = -0.537). In midripening and midlate samples, much less significant correlations between quantitative traits were revealed. The leading role in the formation of yield for this group of samples belongs to the mass of grain from the main spike (r = 0.472). A significant contribution to the grain mass of the main spike is made by the number of grains in it (r = 0.792).