Home Crop Monitoring Late May frost spurs soybean replants, as some corn recovers

Late May frost spurs soybean replants, as some corn recovers


Two, and in some instances, three nights of frost in Ontario has hit the soybean crop fairly exhausting. In some jap counties, re-planting is already underway.

The corn crop didn’t escape unscathed both, although some agronomists and farmers are extra hopeful that many corn acres will get better.

Paul Hermans, space agronomist for Corteva, covers the world from Trenton, Ont., to the Quebec border. The world was exhausting hit by two nights of -1 and -2 levels C.

Hermans says that the worst-hit counties embrace Prescott-Russell, north west Ottawa-Carleton, and Renfrew. In his 24-year profession with the corporate, he says it’s the worst frost occasion he’s seen when it comes to complete acres affected.

“I expect seven to 10 per cent of soybean acres to be replanted,” he writes in an electronic mail to RealAgriculture. “Most years, a ‘bad year’ is considered one to two per cent.”

As to why the frost occasion was so exhausting on beans, Hermans says that it hit a really massive geographic space two consecutive  nights in a row plus a 3rd chilly evening. The overly dry circumstances of May negatively impacted the soil temperature-holding capability of all soil sorts, not simply the extra typical muck or sandier soils. No-till acres appear tougher hit, as properly.

A few of the corn crop within the space will seemingly develop via the injury, he says. A lot of the corn was on the V3 stage (collar technique) and so the rising level remains to be beneath floor. These with broken corn could need to be somewhat affected person to see simply how extreme the injury is.

For areas of Renfrew and factors north, the corn crop was not as fortunate. Charlene Whattam, territory gross sales supervisor for Bayer, based mostly at Renfrew, says that areas of New Liskeard had temps as low as -7 levels C. Nothing made it via and lots of farmers are in a re-plant place. However within the Renfrew space, some soybeans have been hit however the impact was variable. In the identical row, she says, some beans are untouched and others are useless, making the replant resolution extra sophisticated.

Within the southwestern portion of the province, frost injury doesn’t look like as extreme as in different areas. “I think we really dodged a bullet,” says RealAgriculture agronomist Peter Johnson. He’s seen large leaf injury on corn, but it surely’s primarily scald — the product of an especially chilly evening adopted by a very intense sunshine the next day. The tissue that was injured from scald was then killed by a second evening of chilly temperatures.

Pioneer agronomist Greg Stopps travelled his territory, north of London, after the frosty weekend and famous that injury ranges trusted which route he was driving. Total, many of the corn and soybeans have been effective, however as he travelled northeast towards the Owen Sound space “it’s more clear-cut where the beans are done and will have to be replanted.”

Johnson notes that in corn the rising level was nonetheless underneath floor. “So where it did get frozen, it’s still okay. But the soybeans that got damaged could well be dead because the growing point is above ground.”

With regards to replants for soybeans, OMAFRA soybean specialist Horst Bohner is advising growers to train persistence. “When we get into a scenario where it’s obvious there’s been frost… we can make the decision too quickly to condemn a field because some plants are still emerging.” He notes that even when the cotyledons have been frozen off, if the rising level has been protected, new development will emerge.

Bohner says growers want to attend 5 and even seven days to see if there’s new development. He provides that the overwhelming majority of those vegetation will yield simply as properly as soybeans that haven’t had a frost.


Bohner says growers ought to take into account replants when plant populations fall beneath 90,000 per acre or somewhat greater on heavy clay soils. Row spacing can also be a consideration. “If it’s a nice consistent even stand in 30-inch rows you could probably go as low as 70,000 plants. But in that range we’re going to have to thicken things up or start over with a full seeding rate.”

With a big soybean space probably being replanted, growers are additionally asking about seed provide and availability. Stopps says seed provides will rely upon rising maturity. The trade tends to have good stockpiles of maturities 1.5 and up. There may be additionally important seeds provides produced for the 1.0 maturity. Nonetheless, seed provide is tighter within the 0 and 00 teams — the place many of the replant demand will likely be concentrated.

Hermans says that whereas it is a robust one, it’s a one in 24 yr occasion. For perspective, there may be nonetheless way more to be gained 23 years out of 24 by planting early than ready to plant for worry of frost.

“Research shows that we have gained three to five bushels an acre by planting soybeans May 1 to 5 compared to May 15 to 20. There’s more to gain in 23 years than losses in one!” he says. The crop may have amassed 69 to 115 bushels per acre over that interval, which greater than covers the price of one yr of replanting.



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