Iowa State University's Integrated Crop Management Conference
The Alpha and the Omega
“This is, at the end of my career, the same thing as what was important at the beginning of my career—weeds.” Mike Owen, Iowa State University Extension weeds specialist. He said this at the beginning of his talk, which revolved around herbicide-resistant weeds.
More than 50/50
The chances of an above trend-line corn yield in Iowa for 2015, according to Elwynn Taylor, Iowa State University Extension climatologist. It’s not for sure if 2015 will be an El Nino year, but if it is, El Nino normally is favorable for Midwestern crop production.
By The Numbers: 25,000 to 100,000
The amount of fungal spores that cause Northern corn leaf blight (NCLB) per square inch of tissue. “The low end occurs if low relative humidity occurs,” says Allison Robertson, Iowa State University Extension plant pathologist. “The high end occurs if heavy dew or high relative humidity occurs.”
That’s one reason for high NCLB infestations in 2014.
Corn after soybeans vs. corn after corn
Corn after soybeans have a higher probably to be nitrogen (N) deficient because of three factors, says Peter Kyveryga, analytics operations manager at the Iowa Soybean Association.
1. Greater N losses from leaching in wet years due to lower C/N ratio and rapid soybean residue decomposition.
2. Lower frequency of manure applications.
3. Unreliable estimates of soybean N credits.
Corn May Look Better In A Few Months
“The soybean/corn price ratio now favors soybeans. Looking forward, the South American soybean crop started out dry, but now it is looking better. So, there may be a near-record soybean crop coming out of Brazil and Argentina later this year. So, that may shift the corn-soybean ratio to where it favors corn more before we get into the growing season.” David Asbridge, president and senior economist with NPK Fertilizer Advisory Service.
Learn and Apply
Matt Darr, Iowa State University Extension agricultural engineer, discussing a conversation he had with a farmer after discovering a 45 bushel per acre yield advantage one hybrid had over another. “It told him, ‘This is a journey in your career in agriculture. Sometimes you win, and sometimes you lose. The only time you lose is if you ignore the opportunity to learn, take information and build it in your management plan, and not have it happen again."'
Which soil sampling method should you use?
“Zone sampling for P, K, and pH isn’t as good as a 2.5-acre grid sampling, but it is better than sampling by soil type alone,” says Iowa State University Extension soil fertility specialist Antonio Mallarino.
By The Numbers: 40%
The number of times that increasing soybean seeding rates from 130,000 to 160,000 seeds per acre would result in a profitable yield return in three years of an Iowa Soybean Association On-Farm Network study.
At least 10 months
That is how long the bacterium that causes Goss’s wilt can survive in crop residue. “When I go into a soybean field and see corn residue from the previous growing season, it is still there,” says Alison Robertson, Iowa State University Extension plant pathologist. “Once the tissue completely degrades, the bacteria can no longer survive. But it can survive in intact residue.”
By the Numbers: More than 50%
The amount of yield damage that Goss’s wilt, a corn bacterial disease, can cause.
Crop Rotation May Not Help with Sudden Death Syndrome
“This pathogen has the ability to grow on and reproduce on corn residue. It can be recovered on corn residue at a higher rate than on soybean residue,” says Daren Mueller, Iowa State University Extension plant
Lessons from Iowa State University's Integrated Crop Management Conference