Interrelationships of agronomical characteristics in soybean (Glycine max) grown in different environments
2009
Oz, M. (Uludag Univ., Bursa (Turkey). Mustafakemalpasa Vocational High School) | Karasu, A. (Uludag Univ., Bursa (Turkey). Mustafakemalpasa Vocational High School) | Goksoy, A.T. (Uludag Univ., Bursa (Turkey). Dept. of Field Crops) | Turan, Z.M. (Uludag Univ., Bursa (Turkey). Dept. of Field Crops)
This study was conducted to determine the correlations between seed yield and certain yield components and direct and indirect effects of these characters on seed yield in soybean [Glycine max (L.) Merrill]. Eight cultivars were evaluated in two locations (Mustafakemalpasa and Gorukle) of Southern Marmara region, Turkey during two years (2000 and 2001) to determine correlations and path coefficients. Certain agronomical traits such as plant height first pod height, number of pods per plant, number of seeds per plant, number of seeds per pod, 1000 seed weight and seed yield. Combined data over the years and locations indicated that seed yield had significant correlations with number of pods per plant (r = 0.458; P less than 0.01), number of seeds per plant (r = 0.329; P less than 0.01) and number of seeds per pod (r = 0.491; P less than 0.01). Positive associations only between seed yield and number of pods per plant were stable over the years and locations. Path coefficient analysis indicated that the number of seeds per pod gave the greatest direct positive effect (0.4728) on seed yield, followed by number of pods per plant (0.3988). Direct effects on seed yield were 57.0% and 50.4% for number of seeds per pod and number of pods per plant, respectively. Direct positive effect of number of pods per plant was seen stable over the years and locations. As a result, the number of seeds per pod and the number of pods per plant could be used as a selection criterion in breeding, because they were the most important factors in determining seed yield.
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