Published in Scientific Papers. Series A. Agronomy, Vol. LXIV, Issue 2
Written by Neli KERANOVA, MARINA DRUMEVA-YONCHEVA, Yonko YONCHEV, Bistra MIHAILOVA
The aim of the study is to evaluate the impact of morphological traits on the yield of Virginia tobacco lines with consolidated complex resistance to economically important viral diseases, Tobacco mosaic virus and Potato virus Y. The effect of the change in the height of the plant, the number of leaves, the sizes of the sixth and twelfth leaves on the yield is studied. Correlation analysis, regression analysis and Path analysis were applied. The direct and indirect influence of the studied traits on the yields is determined. The calculated correlation coefficients show a very strong, positive correlation between the yield and the length of the sixth leaf (0.985 **), the width of the sixth leaf (0.949 **), the number of leaves (0.934 **), the length (0.970 **) and the width of the twelfth leaf (0.966 **). In L 5, the length of the sixth leaf and the width of the twelfth leaf have a very strong direct effect on the yield. In L 6.3.3, the number of leaves and the length of the sixth leaf have the highest direct effect on the yield.
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