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Growth of 'Braxton' soybeans as influenced by irrigation and intrarow spacing
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The influence of irrigation regime and plant population on growth of a Group VII determinate soybean [Glycine max (L.) Merr.] was measured to determine if a particular growth pattern would result in increased yield. Braxon soybeans were grown in 0.91-m rows on a Cecil sandy loam under full-season irrigation (FSI), irrigation beginning at bloom (BI) and no irrigation (NI). Intrarow spacing ranged from 43 or 61 to 457 mm. At growth stage R2, FSI, BI and NI plants had attained 72, 66 and 75%, respectively, of maximum height and 38, 35 and 55%, respectively, of maximum vegetative dry weight. Height, stem diameter and dry weight were greater in the irrigated treatments than in NI. Full-season irrigated plants were generally taller than BI and NI plants and had 1.7 times more dry weight at R2. With increasing spacing, height decreased while stem diameter increased. Vegetative weight was maximized at spacings of 76 mm or less. Development of canopy cover and LAI was more rapid with decreasing spacing and with irrigation. At least 90% canopy closure was obtained in all spacings of FSI and BI, whereas only 59% was achieved in NI. Yields were the same for FSI and BI and, within irrigation treatments, there were no yield differences among spacing of 305 mm or less. In conclusion: comparable yields can be obtained within a wide range of growth patterns and severe reductions in vegetative growth at R2 may have little influence on yield if water is supplied thereafter. [AS/Sundar]
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 Record created 1985-06-03, last modified 2019-03-05

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