Abstract

VALENCIA-RAMIREZ, Rubén Alfredo  and  LIGARRETO-MORENO, Gustavo Adolfo. Phenotypic correlation and path analysis for yield in soybean (Glycine max (L.) Merril). Acta Agron. [online]. 2012, vol.61, n.4, pp.353-363. ISSN 0120-2812.

This research determinate the correlations between seed yield and characteristics agronomic in soybean and the direct and indirect effects of certain yield components on seed yield although the path coefficients analysis and to identification of indirect selection criteria by height seed yields. Thirty treatments were evaluated in a split strips design with four replications in Oxisoils of the Colombian Orinoquía, in seven environmental during 2007 and 2008. The treatments were conformed by the combination of six soybean varieties and five nitrogen sources. Combined data over the locations indicated that seed yield had significant positive correlation with number of pods per plant -VT (r = 0.81**), number of nudes per plant-NN (r = 0.67**), number of seed per pod-GV(r = 0.44*), and correlation negative with weight of seed-PS(r = -0.44*). Path coefficient analysis showed that VT gave the greatest direct positive effect (0.628) on seed yield, followed by NN (0.260). However, the number of pods with three seed (V3) had high association with seed yield (r = 0.84**). The greater attention should be given to these yield components (VT, NN and V3) as indirect selection criterions for genetic improvement of soybean seed yield.

Keywords : Bradyrhizobium japonicum; characters of yield; Colombia; genetic inheritance; Oxisols; phenothypes.

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