CORRELATION AND PATH COEFFICIENT ANALYSIS ON SEED YIELD IN SUNFLOWER

Thitiporn  Machikowa; Chiraporn  Saetang

Authors

Thitiporn Machikowa School of Crop Production Technology, Institute of Agricultural Technology, Suranaree University of Technology, Nakhon Ratchasima, Thailand
Chiraporn Saetang School of Crop Production Technology, Institute of Agricultural Technology, Suranaree University of Technology, Nakhon Ratchasima, Thailand.

Keywords:

Sunflower, correlation coefficient, path-coefficient analysis, agronomic characters

Abstract

The research was conducted to investigate the correlations among agronomic and yield-relatedcharacters of sunflower and to verify their direct and indirect effects which will be used for theselection for seed yield. Twelve candidate synthetic varieties and 4 check synthetic varieties wereevaluated at Suranaree University of Technology experimental farm, Nakhon Ratchasima, Thailand, inNovember, 2006 using a randomized complete block design with 4 replications. Eight characters werecollected and analyzed for correlations and path coefficients. The results showed that the seed yield wasstrongly correlated with head diameter and plant height. Furthermore, seed yield was also positivelycorrelated with percent seed set and 100-seed weight. A highly negative correlation coefficient wasfound between days to flower and oil content. Significantly positive correlations were found betweenpercent seed set and number of seeds per head, head diameter and 100-seed weight and betweennumber of seeds per head and oil content. The head diameter showed the highest positive direct effecton seed yield followed by plant height. In addition, the indirect effects of most characters were highthrough head diameter. Therefore, head diameter and plant height should be used in the selection foryield in sunflower. The results obtained from correlation and path analyses showed that the efficiencyin the selection for seed yield in sunflower should increased through the selection of head diameter andplant height.

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