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Soybean Planting Dates
Recent university soybean trials conducted in North and South Dakota
have included planting date comparisons. During 1999 to 2001, a soybean
production trial was conducted at the NDSU Carrington Research Extension Center
that included two varieties sown at normal (May 18 to 21) and late (June 1 to 8)
planting dates.
The normal planting date provided a 6% seed yield advantage versus late
planting. However, with early June planting, the short-season variety Daksoy
(00.5 relative maturity) maintained yield while Traill (0.0 relative maturity) yield
decreased by 5% compared to yield with May planting. A South Dakota State
University soybean date of planting trial was conducted at Beresford during
2000-2001 with five planting dates. The first planting date was early May
followed by 7- to 10-day planting intervals and ending during the second week of
June. Average seed yield with the first 3 planting dates (May 3 to 25) ranged
from 46.6 to 48.1 bu/acre compared to 40.4 bu/acre with the early June planting
date (June 2 and 4) and 39.2 bu/acre with the last planting date (June 10 and
11). In summary, plant soybean by May 25 for adequate yield potential and select
varieties with shorter maturity if planting is delayed.
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