CLUSTER ANALYSIS OF WINTER RAPE VARIETIES AND HYBRIDS YIELD CAPACITY IN DIFFERENT AGRO-CLIMATIC REGIONS OF UKRAINE

Abstract

The application of cluster analysis for the assortment of winter rape varieties and hybrids of current selection has been grounded. The research was conducted in 2013–2015 in four different agro-climatic regions of Ukraine. To get a stable and high performance of winter rape under the conditions of major agro-climatic zones of cultivation we need to adhere to the principles of production saturation with different varieties and hybrids to reduce the risk of loss of crops in the autumn–winter period and harvest shortfall due to the unfavorable factors of environment. For the farm cultivation of different varieties and hybrids, we should avoid selecting for the central region Cleopatra PR44V30, DK Sequoia, and Demerka and PR45D05. For the farms of southern region, it is undesirable to combine two groups of varieties, namely Cleopatra, Cheremosh, NK Oktan and PR45D05 or Snow Queen, Jumper, Sitro, Demerka, Abakus, Belana, PR44V30, DK and DK Sequoia and DK Sekyur. For the western region Cleopatra, DK Sekyur, NK Oktan, PR45D05, DK Sequoia and Sitro are similar in performance in terms of years of the research, and for the eastern region, there are the following varieties of Cleopatra, PR44V30, DK Sekyur, Snow Queen and Sitro. We mean the varieties and hybrids with different groups of clusters can be sown under the conditions of one farm, but within the same group of clusters, it is undesirable.