Formation of spring wheat productivity in arid conditions of Buryatia

The results of productivity and its elements study at the zoned grades and selection numbers of spring wheat, derived in Buryat research institute of agriculture in the condition of dry steppe of Buryatia are presented. Variable basic element structure and size their contribution in formation yield were identified by conducting structural and correlation analysis. Varieties were tested in dry conditions without mineral fertilizers application. Variation studied traits on average for year’s re-search (2005-2013) on 55.4 % was conditioned by the influence condition vegetation. At the same time sowing in the second decade of May, the av-erage for the period of research productivity middle- grades was higher than that of middle and was equal to 10.7 %. The main contribution to the yield variability was added by weather conditions of veg-etation periods (years) equal to 76.4 %, and the degree of influence of the varietal characteristics accounted for only 10.3 %. Moisture content had critical periods of growth and development plant predetermined high level yield. The leading role in shaping the productivity in virtually all samples be-long to plant height, genotypic variability which amounted to 27.0 %, and 1000 grain weight, the number of grains and grain weight from the ear. The number of grains per ear and productivity con-tribute significantly to the yield variability grades Lutescens 937, Aruna, Buryat bristlecone and number L-952. The number of productive stems has a major influence on the formation of yield vari-eties Buryat 79 and Buryat 34. Plant height and the number of grains per ear can serve as indicators of a good drought resistance and productivity in arid conditions region.