By Liz Stahl, Extension Educator - Crops and Jeff Coulter, Extension Corn Agronomist
Results of the 2012 University of Minnesota corn grain and silage trials are available online at the following links:
2012 Corn Grain Hybrid Trial Results: http://z.umn.edu/corn2012
2012 Corn Silage Hybrid Trial Results: http://z.umn.edu/cornsilage2012
Results are based on replicated trials conducted at multiple locations across Minnesota to provide growers and agronomists with an unbiased source of information on hybrid performance.
In a year where tremendous variability was observed within fields as well as among locations, information from replicated trials like the University of MN trials is particularly valuable as replication helps account for this variability.
Since we can't predict next year's growing conditions, when selecting hybrids it is recommended to choose hybrids that perform well over multiple locations within a region. Hybrids that consistently perform well over multiple environments, including different soil and weather conditions, have greater potential to perform well the next year compared to hybrids with less consistence performance.
Growers are also encouraged to select hybrids based on trial results from multiple sources, including other university results, the Minnesota Corn Growers Association, seed companies, and on-farm strip trials. Results from unbiased and replicated trials that include multiple hybrids from a number of sources are of particular importance.
Click on the links below for results from additional corn hybrid trials:
· Hybrid selection begins with maturity. Growing Degree Day (GDD) accumulation was well ahead of normal in 2012. Combined with an early planting season overall, corn matured early in 2012. In planning for next year, identify an acceptable maturity range based on the number GDDs required for a hybrid to reach physiological maturity (black layer). Selected hybrids should reach maturity at least 10 days before the first average freeze (32⁰F) to allow time for grain dry-down and to provide a buffer against a cool year or late planting. Detailed information about the number of GDDs available for corn production for multiple locations and various planting dates, along with information on the relationship between GDDs and corn relative maturity (RM) is available at: http://www.extension.umn.edu/distribution/cropsystems/M1276.html
· Plant multiple hybrids of varying maturity to spread risk and widen the harvest interval.
· Very full-season grain hybrids do not consistently out-yield mid-season hybrids in Minnesota. There is more variability in yield among hybrids within a given RM rating than there is between maturity groups. Detailed information on corn grain yields and harvest moisture for various RMs across Minnesota is available at: http://www.extension.umn.edu/distribution/cropsystems/M1276.html
· Hybrids should also be selected according to agronomic traits such as standability, disease tolerance, emergence, and the need for transgenic resistance to insects and herbicides within a given production system. Standability is a key trait for ensuring that the grain produced is harvestable.
Considerations for Silage Hybrid Selection:
· One of the first things to consider when selecting silage hybrids is maturity. Longer-season hybrids tend to have higher silage yields. A general guideline is that hybrids planted for silage should be 5 to 10 days longer in RM than the hybrids planted for grain. However, these later-maturing hybrids may not be the best choice for a producer wanting early silage or the option to harvest the corn for grain.
Please note that these results, along with results for other significant crops in Minnesota, will published in the "Minnesota Varietal Trials Results" publication, which should be out by early January of 2013.