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Growth response of short-season soybean to variations in row spacing and density
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The physiological basis of increased seed yield in short-season soybeans (Glycine max (L.) Merr.) as row widths are narrowed and plant densities are increased were studied. Seed yield increased 31% and 16% by decreasing the row width from 75 to 25 cm and 50 to 25 cm, respectively. Seed yield increased 27% by increasing the plant density from the 25 to 80 seeds per square meter density with no further increase from the 135 seeds per square meter density. There were no interactions between row width and plant density for seed yield or any other variables analyzed. Harvest indices and lodging were similar among row widths, but narrow rows on the average accumulated more dry matter (DM), had greater leaf area indices (LAIs) and greater net assimilation rates (NARs) than wider rows which contributed to the greater relative growth rates (RGRs) and crop growth rates (CGRs) in narrow rows. These results suggest that in narrowing row width a nearly optimum canopy display of leaves is achieved resulting in greater seed yields than in wide rows. [AS/Sundar]
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 Record created 1985-05-31, last modified 2019-03-04

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