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Pay attention to late-planted corn to protect yield
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What to expect from May 15 planting date
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Tom J. Bechman
WIDE WINDOW: Sporadic weather conditions in early spring contributed to soybean planting being spread out this year. This field was planted April 9. Don’t neglect scouting early beans if you’re still planting. Soybean Watch: Keep an eye on soybeans that are already growing while you’re still planting.
Suggested Event
Jun 15, 2021 to Jun 17, 2021
A relatively warm, dry spell in early April led to planters running in parts of the eastern Corn Belt, especially in southern counties. Many of those planters during the first couple weeks of April were planting soybeans.
Early-planted soybeans tended to yield better than later-planted fields in 2020, although there were exceptions, notes Steve Gauck, a regional agronomy manager for Beck’s based near Greensburg, Ind. Beck’s sponsors Soybean Watch ’21. Exceptions were some later-planted fields that still yielded well. Almost all soybeans planted early in 2020, except those caught b
Final sampling time
Samples were pulled at the V5 stage in 2020. Zinc was borderline. Adding it might have boosted yields, even though zinc was added with the starter. At the 12-leaf stage, tissue tests showed that key nutrient levels for nitrogen and potassium were dropping, most likely because the field had just suffered through a very dry period. Rain refreshed the plants, but nutrient levels weren’t up yet when samples were taken hours after the rain.
The recommended time to take the third sample if you’re only taking three is at R1, Bower says. According to the Purdue University Corn and Soybean Field Guide, it’s just before pollination and silking. By R2, kernels have formed blisters. In the Corn Watch 2020 field, samples were pulled at R2, which is still valuable information.
Tom J. Bechman
ROLL THE HOOP: Jim Facemire, Edinburgh, Ind., counts plants within the hula hoop after rolling it in a random spot within the field. Once you determine stands, figure out if enough plants are present.
How do you determine if you have enough soybean plants to leave the stand? Shaun Casteel, Purdue University Extension soybean specialist, is working on a way to make that decision based on a drone flight. Until he does, your best option is field scouting, using a hula-hoop rolled at random in several places within a field to determine average stand count.
Casteel says the key is to take those stand counts early, when soybeans are no bigger than the VC stage, with a pair of unifoliate leaves extended over the cotyledons.
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