Last week, Lane also discussed the revisions to the online soybean fungicide calculator to account for spring rainfall. Since March through May rainfall has exceeded 12 inches in nearly all of the state of Iowa, growers will be much more likely to see a return on the investment with an R3 application on soybeans this year. "As we've been saying for the past few weeks, this unusual weather has given us the opportunity to gather data comparing late plantings of differing maturity corn hybrids and corn vs. switching to soybeans," says Lane. "We've had a few takers on the normal vs. early maturity corn replicated strip trials, but so far none on the soybeans vs. corn. If you've considered all the options and are at the point where you're about to make a switch, we'd encourage you to plant three combine (or sprayer) width strips of corn in the field you're now planting to beans in order to make a final economic comparison after harvest. See the protocol for this trial."
Now is the time to scout fields and check the growth stage of your crops
Finally, if you were able to get corn planted earlier, check the growth stage. Tristan Mueller, ISA On-Farm Network program manager, says it may be growing faster than you think, especially with the recent warm days. "If you signed up for On-Farm Network fungicide trials, many of the products need to go on between the V5 and V10 growth stages," Mueller says. He also notes that with the wet weather this spring, the chances of seeing a benefit from fungicide on corn are higher than normal. "We still have some products left for fungicide trials, and with much of the corn behind schedule, it's not too late to get involved," he says.
Fungicides still available for 2013 trials include: Priaxor, Custodia, Quilt Xcel + Halex GT, and ProAct + Propiconazol vs. Headline. In 2011 and 2012, both drier years, V5 applications of fungicides on corn averaged about 1 bushel per acre yield response. See Mueller's report from the 2013 On-Farm Network Conference for more on fungicide use and yield response. For information on any of the 2013 replicated strip trial opportunities discussed here, contact: Tristan Mueller firstname.lastname@example.org or 515- 669-9151; Anthony Martin email@example.com or 515-669-9157; or Patrick Reeg firstname.lastname@example.org or 515-669-9184.