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Light Interception Efficiency and Light Quality Affect Yield Compensation of Soybean at Low Plant Populations

Dep. of Agronomy, Louisiana Agric. Exp. Stn., LSU Agric. Ctr., Baton Rouge, LA 70803 USA

View larger version (31K): [in a new window]   Fig. 1 Plant populations for low, medium, and high plant populations between emergence and R5 for soybean planted near Baton Rouge, LA, in 1995 and 1996. Low population = 80000 plants ha-1; medium population = 145000 plants ha-1; high population = 390000 plants ha-1. *Low and medium plant populations are significantly different according to LSD (P < 0.05). Medium and high plant populations are significantly different according to LSD (P < 0.05). Low and high plant populations are significantly different according to LSD (P < 0.05)

View larger version (27K): [in a new window]   Fig. 2 Leaf area index (LAI), crop growth rate (CGR), and total dry matter during vegetative and early reproductive periods for soybean grown at low, medium, and high plant populations near Baton Rouge, LA, in 1995. Low population = 80000 plants ha-1; medium population = 145000 plants ha-1; high population = 390000 plants ha-1. *Low and medium plant populations are significantly different according to LSD (P < 0.05). Medium and high plant populations are significantly different according to LSD (P < 0.05). Low and high plant populations are significantly different according to LSD (P < 0.05)

View larger version (27K): [in a new window]   Fig. 3 Leaf area index (LAI), crop growth rate (CGR), and total dry matter during vegetative and early reproductive periods for soybean grown at low, medium, and high plant populations near Baton Rouge, LA, 1996. Low population = 80000 plants ha-1; medium population = 145000 plants ha-1; high population = 390000 plants ha-1. *Low and medium plant populations are significantly different according to LSD (P < 0.05). Medium and high plant populations are significantly different according to LSD (P < 0.05). Low and high plant populations are significantly different according to LSD (P < 0.05)

View larger version (30K): [in a new window]   Fig. 4 Seasonal pattern of branch dry weight accumulation for soybean grown at low, medium, and high plant populations near Baton Rouge, LA, in 1995 and 1996. Low population = 80000 plants ha-1; medium population = 145000 plants ha-1; high population = 390000 plants ha-1. Medium and high plant populations are significantly different according to LSD (P < 0.05). Low and high plant populations are significantly different according to LSD (P < 0.05)

View larger version (28K): [in a new window]   Fig. 5 Crop growth rate (CGR) per plant for soybean grown in low, medium, and high plant populations near Baton Rouge, LA, in 1995 and 1996. Low population = 80000 plants ha-1; medium population = 145000 plants ha-1; high population = 390000 plants ha-1. *Low and medium plant populations are significantly different according to LSD (P < 0.05). Medium and high plant populations are significantly different according to LSD (P < 0.05). Low and high plant populations are significantly different according to LSD (P < 0.05)

View larger version (26K): [in a new window]   Fig. 6 Relative growth rate (RGR), net assimilation rate (NAR), and light interception efficiency (LIE) for soybean grown in low, medium, and high plant populations near Baton Rouge, LA, in 1995. Low population = 80000 plants ha-1; medium population = 145000 plants ha-1; high population = 390000 plants ha-1. *Low and medium plant populations are significantly different according to LSD (P < 0.05). Medium and high plant populations are significantly different according to LSD (P < 0.05). Low and high plant populations are significantly different according to LSD (P < 0.05)

View larger version (23K): [in a new window]   Fig. 7 Relative growth rate (RGR), net assimilation rate (NAR), and light interception efficiency (LIE) for soybean grown in low, medium, and high plant populations near Baton Rouge, LA, in 1996. Low population = 80000 plants ha-1; medium population = 145000 plants ha-1; high population = 390000 plants ha-1. *Low and medium plant populations are significantly different according to LSD (P < 0.05). Medium and high plant populations are significantly different according to LSD (P < 0.05). Low and high plant populations are significantly different according to LSD (P < 0.05)

View larger version (29K): [in a new window]   Fig. 8 Relative leaf area expansion rate (RLAER) for soybean grown in low, medium, and high plant populations near Baton Rouge, LA, in 1995 and 1996. Low population = 80000 plants ha-1; medium population = 145000 plants ha-1; high population = 390000 plants ha-1. *Low and medium plant populations are significantly different according to LSD (P < 0.05). Medium and high plant populations are significantly different according to LSD (P < 0.051). Low and high plant populations are significantly different according to LSD (P < 0.05)

View larger version (29K): [in a new window]   Fig. 9 Partitioning of total dry matter into branches and red/far red light ratios received at the main stem for soybean planted at low, medium, and high plant populations near Baton Rouge, LA, in 1995. Low population = 80000 plants ha-1; medium population = 145000 plants ha-1; high population = 390000 plants ha-1. *Low and medium plant populations are significantly different according to LSD (P < 0.05). Medium and high plant populations are significantly different according to LSD (P < 0.05). Low and high plant populations are significantly different according to LSD (P < 0.05)

View larger version (29K): [in a new window]   Fig. 10 Partitioning of total dry matter into branches and red/far red light ratios received at the main stem for soybean planted at low, medium, and high plant populations near Baton Rouge, LA, in 1996. Low population = 80000 plants ha-1; medium population = 145000 plants ha-1; high population = 390000 plants ha-1. *Low and medium plant populations are significantly different according to LSD (P < 0.05). Medium and high plant populations are significantly different according to LSD (P < 0.05). Low and high plant populations are significantly different according to LSD (P < 0.05)

View larger version (26K): [in a new window]   Fig. 11 Partitioning of total dry matter (TDM) into branches, main stems, petioles, and leaves as affected by plant population, averaged across 1995 and 1996, for soybean planted near Baton Rouge, LA. Means not followed by the same letter are significantly different according to LSD (P < 0.05). Low population = 80000 plants ha-1; medium population = 145000 plants ha-1; high population = 390000 plants ha-1