USE OF REGRESSION ANALYSIS WHEN EVALUATING ECONOMIC VALUE OF RICE VARIETIES
In breeding process the final stage of studying the developed rice varieties is competitive testing. In this case, assessment of a set of economically valuable traits is performed, the main ones being yields and resistance to blast. In State testing varieties are also evaluated by the method of competitive testing. Based on the data obtained during the study of seven rice varieties with varying resistance to blast is at the Abinsk State varietal plot, the efficiency of using linear regression analysis for isolating the best of them is shown. As a criterion for evaluating resistance of rice variety, the indicator was chosen - the number of plants affected by blast in 100 rice plants. The regression equation was used to construct the regression line. The regression line shows the yield of each tested variety, coupled with the number of affected plants. As standard-check varieties blast resistant variety Snezhinka and susceptible variety Izumrud were used. The location of varieties Olimp and Atlant above the regression line near the standard Snezhinka confirms their resistance to blast while maintaining high yields. When growing such varieties, the use of chemical protection against blast is not required, and this is economically advantageous. It is noted that regression analysis also allows, at the stage of competitive testing, to identify, in addition to disease-resistant varieties, the so-called «hardy» varieties, which, when afflicted with the disease, reduce yields less than those that are unstable.