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Yield Components Related to Seed Yield in Determinate Soybean

Board, J. E.
Crop science 1987 v.27 no.6 pp. 1296-1297
Glycine max, cultivars, crop yield, yield components, seeds, planting date, branches, Louisiana
Studies were conducted to determine which yield components were correlated with seed yield among eight determinate soybean [ (L.) Merr.] cultivars. Soybean cultivars were planted in early April, mid-May, and mid-June in 1981 and 1982 at Baton Rouge, LA (30° N lat) on an Olivier silt loam (fine-silty, mixed, thermic Aquic Fragiudalfs) soil. At maturity, plant samples were separated into main and branch stem components. Main and branch stem length, branch number, node number, fertile node number, pod number, pods per fertile node, seed per pod, seed size, and seed yield were determined. Across planting dates, cultivars, and years, seed yield was more closely related to number of seed (= 0.69**, significant at the 0.01 probability level) than to seed size (= 0.20**) or seeds per pod (= 0.11). Seed yield was also highly correlated with number of pods, number of fertile nodes, and number of nodes, but not with pods per fertile node or with the percentage of nodes becoming fertile. Observations indicated that branch portions resulted in higher correlations than did main stem portions. Results indicate that these branch yield components maybe useful criteria in selecting higher yielding cultivars.