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• W1983409195 abstract "Several studies have shown that little movement of carbohydrate occurs in soybean (Glycine max (L.) Merr.) from a leaf at one node to nodes more than two removed from the source node. Most light is intercepted in the upper periphery of the soybean canopy, but most of the seed yield occurs on the lower central nodes of the soybean plant. Thus, this study was designed to examine leaf area display and light interception patterns in the crop canopy in relation to yield production sites of two varieties of short-season indeterminate soybeans. Altona and Evans soybeans were planted in South Deerfield, MA on 19 May 1982 in rows 25 cm and 75 cm apart. Plots were overseeded by 50% into a fine sandy loam (Typic Udifluvents) and later thinned to populations of 25, 50 and 75 plants per m2. Light readings, taken weekly when weather permitted, were integrated over 1 m across and parallel to soybean rows, with the sensor placed on the ground, 25 and 50 cm above the ground and above the canopy dependent on plant height. Growth samples were taken biweekly with samples for leaf area determination divided into five strata, separated on the basis of point of attachment and display of the leaves. Soybean plants grown in narrow rows (25 cm) had a greater leaf area index, intercepted more light and yielded 23% more than soybeans grown in wide rows. For seed yield there was a variety-row width-density interaction, with Evans requiring a lower density for maximum yield than Altona in the 25-cm row width. Seed yield averaging 346.3 g m−2 for Evans was 32% greater than the average for Altona. Although most light interception, and therefore photosynthate production occurred in the upper regions of the plant canopy, many of the leaves displayed there were attached to nodes lower in the plant. Thus carbohydrates were suppled to lower regions of the plant, from these leaves, where most of the yield was found to occur. However leaves attached low in the canopy were still somewhat shaded by upper leaves, thus it is probable that greater efficiency of production could be obtained by concentrating breeding effects for improved canopy architecture with deeper light penetration into the canopy." @default.
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• W1983409195 date "1984-01-01" @default.
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• W1983409195 title "Leaf area display and light interception in short-season soybeans" @default.
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• W1983409195 doi "https://doi.org/10.1016/0378-4290(84)90023-6" @default.
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