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.


South-Central ND


During May 8 to 14, area moisture (rain and snow) amounts ranged from 1.2 inches at McLeod to 0.12 inches at Linton as recorded at NDAWN sites. Most of the region received about 0.5 inches or more of moisture. Black soil temperatures at the 4-inch depth ranged from the upper 40's to low 50's F on May 14. Fieldwork should be in progress throughout this week of May 13.


There continues to be a wide spread of seeding progress between counties north of I-94 compared to counties near the South Dakota border, as of May 15. In the southern counties, small grain seeding is nearly complete and corn should be finished at week=s end. Small grain fields seeded in April generally have emerged. Soybean planting is in progress and dry bean and sunflower planting will start soon. In Eddy, Foster, Sheridan and Wells counties, 25% or less of small grain, canola, and flax seeding is complete. General concern exists with timely seeding of corn and cool-season crops. This may mean a likely increase in soybean and sunflower acres for this northern region. Wild oat and other early-season weeds are emerging.


Greg Endres

Area Extension Specialist/Cropping Systems

NDSU Carrington Research Extension Center