Over the previous decade, growers have pushed soybean planting dates earlier as they pursue larger yields.
Earlier planting extends the rising season, however rolling out the planter in late April additionally impacts a number of different elements that contribute to yield, says Horst Bohner, soybean specialist for the Ontario Ministry of Agriculture, Meals and Rural Affairs.
Planting early additionally results in extra nodes on the plant earlier than flowering, which may have a major influence on yield, notes Bohner. He likes to see six trifoliates on a plant at flowering. When growers plant late there might solely be three trifoliates at this stage.
Planting date additionally impacts the plant’s means to benefit from longer summer time days and optimum rising situations. “July delivers much more solar radiation than can be captured in August,” provides Bohner. “When you plant later you’ve missed out on some of the best solar radiation that the season has to offer.”
How early ought to growers plant soybeans to benefit from these yield-enhancing elements? Bohner notes that the oilseed has a status for not liking cold soil, however that notion continues to fade as analysis and discipline efficiency offers extra proof that soybeans are actually fairly robust.
On this episode of RealAgriculture’s Soybean Faculty, Bohner shares outcomes from a planting date trial he carried out in 2020 with no-till soybeans planted in 15-inch rows at 175,000 seeds/ac. Within the trial, soybeans had been planted on 5 dates starting from April 22 to June 10. (Story continues after the video)
Bohner notes that the seed planted on the earliest date (April 22) needed to endure cold temperatures that dipped to -4 °C inside 12 hours of planting. Regardless of the shivering cold, these soybeans produced a suitable plant stand (134,000 crops/ac) and the second-highest yield within the trial at 64.1 bu/ac.
“At the end of the day, soil temperature is not that important for soybeans,” Bohner concludes. However, if situations are moist and cold or whether or not a cold rain is anticipated instantly after planting, parking the planter could be a prudent plan of action.
General, Bohner believes growers shouldn’t be afraid of planting a portion of their acres within the latter a part of April in Ontario — if the weather looks good and the bottom is fit.
Click on right here for extra Soybean Faculty episodes.