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Northwest Iowa Dairy Outlooks

A local discussion of current science and issues concerning dairying in northwest iowa


The Uniform Wheat Variety Trial (UWVT), coordinated and implemented by numerous Texas AgriLIFE Extension and Research faculty and staff plus AgriPro researchers in this area provides unbiased yield data for wheat producers in Wichita and Wilbarger Counties. With this information area wheat producers can make an educated decision about the most appropriate varieties for this region.

The selection of wheat varieties is one of the most important decisions a wheat producer will make. This decision impacts the potential yield (forage and grain), seed quality (test weight and protein), disease and insect management, and maturity. It is important that producers diversify the varieties to be planted on their farms. Variety diversification spreads the risk associated with potentially devastating pests (rusts, Hessian fly, leaf curl mite, greenbugs, etc.) and yield loss from adverse environmental factors (freeze, drought, hail, etc.).

Producers should select no fewer than two varieties to plant on their farms and preferably more, depending on size and location of fields. Variety selection should be based upon a combination of sound data from university trials, county agent strip trials, and other reliable sources. Wheat varieties should be chosen based on multiple years of data (yield, pest resistance, grain quality and maturity). High yields over multiple years and multiple locations demonstrate a variety’s ability to perform well over diverse environmental factors.

Stable yield performance of quality grain is the best variety selection tool. It is important to consider decreasing yields over a two or three year time frame, may reflect a change in disease and/or insect resistance.

When selecting a variety for the 2010-11 season, producers need to consider the 2009-10 season, recognizing the unusually wet, cold conditions that impacted yield and quality. It is strongly encouraged that producers look at the two and three year averages for the varieties and to look at all local variety trial locations.

Yield and test weight at each location has been statistically analyzed using the scientific procedures. The statistical analysis provides the mean, coefficient of variation (CV), and least significan difference (LSD) values. It is important to note these statistical values help to prevent the misinterpretation of the data. The mean is another term for the average. Therefore, a mean value is the average of all the variety’s yield within a trial. The CV value, expressed at a percentage, indicates the level of unexplained variability present within the trial. High CV values indicate a great deal of variation due to factors other than the genetic variation between varieties. CV values in excess of 15 percent should cause producers ask about problems in the trial that will misrepresent differences in varietal performance. The LSD value should be used to determine if the difference between hybrids is due to performance differences or random chance. This bulletin presents data with an LSD of five percent. If the difference between two varieties is equal to or greater than the LSD, the difference would be attributable to varietal differences in 19 out of 20 (95%) instances when the two hybrids are evaluated under conditions similar to the test. A difference which is less than the LSD is likely due to chance.

Click below for the trial results.

  2010 Local Wheat Variety Trial Results Now Available


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