Some features of the biology of the studied samples of variable alfalfa (Medicago varia L.) in the Middle Volga region

The article presents the results of evaluation of promising varieties and populations of variable alfalfa (Medicago varia L.) in the changing climatic conditions of the Middle Volga region. The objectives of the research were to identify the most valuable varieties and populations of alfalfa in the competitive variety testing (CSI) for 2012-2015, taking into account the main biological features of the culture. The assessment of weather conditions of the region allows to draw a conclusion that in General conditions of the zone in 2012-2015 corresponded to requirements of culture. According to the conducted researches it is possible to tell that all samples possessed a number of economically valuable signs and properties. It should be noted that all populations formed a crop of seeds in the year of sowing. The numbers capable of forming a crop from the soil after receiving seeds are allocated-Dark green-1.0 kg/m2, Population 8 and Population 24 on 0.8 kg/m2. There were 6 varietal populations distinguished by important indicators of the adaptation of varieties to growing conditions-spring regrowth and regrowth after mowing: Population 24, Population 7, population super, Emerald, Guzel SP 03 and population km. It is established that in different moisture years, in the conditions of the region, all studied varieties and populations form 2 full-fledged mowing per season. All studied samples can be characterized as highly productive in vegetative mass and seeds. Samples with increased leafiness, both in the first and in the second mowing, were noted. The total collection of green mass was in the range of 11.7-16.0 kg/m2. All these issues remain relevant and require further, more in-depth study.