INFLUENCE OF SOWING DATES ON YIELD AND VEGETATION PERIOD OF EARLY-MATURING SOYBEAN LINES

The study was carried out within the framework of the budget program 055, on the topic of "creating photoperiodically neutral, early-maturing soybean varieties for cultivation in conditions of East Kazakhstan". It included determining the growing season length, the elements of productivity and yield of 6 early-maturing lines of soybean of Kazakh breeding (LLP Kazakh Research institute of arable farming and plant growing): 371/2, 460, 210, 394, 379, 370 and 4 lines of Russian breeding: SSC-182, SSC-294, SSC-285, SSC-292 (Siberian research Institute of fodder of RAAS) depending on the sowing date. The photoperiodically neutral samples with high yield potential were identified.