Yield of indeterminate and determinate semidwarf soybean for several planting dates, row spacings, and seeding rates

Yield of indeterminate and determinate semidwarf soybean for several planting dates, row spacings, and seeding rates

1988

A:PS

Determinate semidwarf cultivar of soybean [Glycine max (L.) Merr.] were developed to overcome the lodging barrier to high yield, but little work has been reported on their response to production systems or environments. The objective of this study was to determine the effect of planting date, row spacing, seeding rate, and their interactions on determinate vs. indeterminate cultivars. The cultivars 'Sprite' (determinate semidwarf) and 'Williams' (indeterminate) were compared at two Ohio locations over a 3-yr period. Planting dates were 1 May, 20 May, and 10 June, and row spacings were 7, 10, 14, and 20 in. Seeding rates of 150 000 and 200 000 seeds/acre for Williams, and 150000, 200 000, 250 000, and 300 000 seeds/acre' for Sprite were used. Delayed planting reduced yield significantly. The response to increasing row spacing was a small decrease in yield for both cultivars, which was moderated by both planting date and seeding rate. The yield of Sprite-but not Williams-increased as seeding rate was increased, regardless of planting date or row spacing. Mean yield decreased 300/0 from the first to third date of planting, while row spacing and seeding rate effects were in the range of 5 and 6%, respectively. While Williams did not respond to seeding rate, there was a planting date x seeding rate interaction. Sprite responded to seeding rate, but there was no planting date x seeding rate interaction; however, there was a threeway interaction (environment x seeding rate X planting date).

v.1(4):300-303, JOURNAL OF PRODUCTION AGRICULTURE

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