Soybean School: Counting plants to assess stand establishment


Soybeans have been gradual to emerge and set up throughout Ontario this spring as cooler climate has tempered the vigour of the heat-loving crop.

Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA) soybean specialist Horst Bohner notes that the crop tends to flourish early within the season when the daytime temperature reaches 28 levels C and nights hover round 24 levels C. Overall, most soybean fields throughout the province are on the 2nd and third trifoliate stage because the calendar pushes into mid June.

Bohner is encouraging all growers to scout their fields to decide how their plant stands stack up and assess yield potential. On this episode of RealAgriculture’s Soybean faculty, he seems at two strategies growers can use to decide plant populations and assess their stands. He rapidly critiques the normal hula hoop methodology which requires a grower to rely the variety of plants within the hoop on common when it’s tossed randomly throughout the sector. If the ring averages 12 plants, for instance, the inhabitants is estimated at 75,000 plants.

When it comes to the really helpful plant numbers, Bohner notes that 90,000 plants per acre are required on lighter textured soils and loam soils. That quantity will increase to 110,00 plants on heavier clay-type soils. “If you might be beneath that you simply actually have to begin fascinated with whether or not you’ve gotten to beef that inhabitants up with a replant or one other go,” he provides.

Bohner additionally shares a easy plant counting methodology based mostly on the variety of sq. ft in an acre — 43,560. “Basically, one plant per sq. foot shouldn’t be sufficient; two plants per sq. foot is okay (no replant is required); and three plants per sq. foot is a traditional stand,” he provides. In the video, he demonstrates how growers can do a easy calculation utilizing their very own ft as they stroll by soybean fields. “2.5 plants per foot is equal to about 100,000 plants per acre…. If I common 4 plants per foot size, it’s about 140,000.”

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