Sequential Path Model for Grain Yield in Soybean

  • Mohammad SEDGHI University of Mohaghegh Ardabili, Department of Agronomy and Plant Breeding, Faculty of Agriculture, Ardabil
  • Bahman AMANPOUR-BALANEJI University of Mohaghegh Ardabili, Department of Agronomy and Plant Breeding, Faculty of Agriculture, Ardabil

Abstract

This study was performed to determine some physiological traits that affect soybean,s grain yield via sequential path analysis. In a factorial experiment, two cultivars (Harcor and Williams) were sown under four levels of nitrogen and two levels of weed management at the research station of Tabriz University, Iran, during 2004 and 2005. Grain yield, some yield components and physiological traits were measured. Correlation coefficient analysis showed that grain yield had significant positive and negative association with measured traits. A sequential path analysis was done in order to evaluate associations among grain yield and related traits by ordering the various variables in first, second and third order paths on the basis of their maximum direct effects and minimal collinearity. Two first-order variables, namely number of pods per plant and pre-flowering net photosynthesis revealed highest direct effect on total grain yield and explained 49, 44 and 47 % of the variation in grain yield based on 2004, 2005, and combined datasets, respectively. Four traits i.e. post-flowering net photosynthesis, plant height, leaf area index and intercepted radiation at the bottom layer of canopy were found to fit as second-order variables. Pre- and post-flowering chlorophyll content, main root length and intercepted radiation at the middle layer of canopy were placed at the third-order path. From the results concluded that, number of pods per plant and pre-flowering net photosynthesis are the best selection criteria in soybean for grain yield.

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Author Biography

Mohammad SEDGHI, University of Mohaghegh Ardabili, Department of Agronomy and Plant Breeding, Faculty of Agriculture, Ardabil
Dr. Mohammad Sedghi is currently working as Head in Department of Agronomy and Plant Breeding, University of Mohaghegh Ardabili, Iran since 2008. Dr. Mohammad Sedghi received his B.Sc. in Agronomy and Plant Breeding in 1998 at Urmia University, Iran. He got M.Sc. in Agronomy in 2001 from University of Tehran, Iran. Dr. Mohammad Sedghi obtained Ph.D. from University of Tabriz, Tabriz, Iran in 2005 in Crop Physiology. Dr. Mohammad Sedghis current research interests are Plant Physiology, Stress Physiology, Enzyme and Isozymology, Oxidative Stress, Medicinal plants.
Published
2010-09-27
How to Cite
SEDGHI, M., & AMANPOUR-BALANEJI, B. (2010). Sequential Path Model for Grain Yield in Soybean. Notulae Scientia Biologicae, 2(3), 104-109. https://doi.org/10.15835/nsb234852
Section
Crop and Soil Sciences; Research Articles