Abstract:

Correlation analysis, multiple regression analysis, path coefficient analysis and determination coefficient analysis were undertaken among yield and its components in ten Yuetang series of sugarcane varieties to clarify the relation among yield and its components and the relative contribution among yield components. Simple correlation among yield and its components revealed positive and extremely significant correlation between yield and stalk number (0.643**), yield and stalk length (0.650**), stalk length and stalk number (0.234**). There was a non-significant but positive correlation between yield and stalk diameter (0.025) and a negative and extremely significant correlation between stalk diameter and stalk number (-0.416**), stalk diameter and stalk length (-257**). However, partial correlation analysis showed that, there was extremely significantly positive correlation between cane yield and its components (0.854**, 0.836** and 0.741**). Multiple regression equation was y=0.235x1+0.370x2 +48.795x3-202.674 (ry.123=0.924**) and F value reached extremely significant level. Path coefficient analysis and determination coefficient analysis in the case of yield components showed revealed that, the stalk number was the most important character with the highest direct effect on cane yield relative to stalk length and stalk diameter. Increase the stalk number could improve significantly cane yield. The stalk number emerged as the most important traits influencing cane yield and was the direction of high yield breeding and cultivation. In high yield breeding of sugarcane, firstly we should strengthen the selection intensity of stalk number, and secondly take the important yield components stalk length and stalk diameter in account.