he crop variety and hybrid performance trials listed in the following pages are designed and conducted under a set of crop management criteria that best allows determination of differences in crop performance due to genetic potential of the lines evaluated. To appropriately determine differences that are due to a variety (genetics), researchers design the experiment to eliminate or at least reduce other sources of variation. As an example, individual trials are planted in an area with a uniform soil type and similar cropping history. This eliminates possible differences in variety performance that may be due to variability in soil fertility, soil moisture, and texture across the study area.
The crop performance attained within these trials is determined by recording yield, crop quality, plant maturation, height, lodging, and many other traits that vary with the crop being tested. The performance levels attained should express the potential of that crop variety/hybrid when planted under similar conditions on the farm. Identification of treatments that allow our producers to select practices that optimize their efforts is a primary objective of this research. The figure below shows the variability in spring wheat grain yield across a farmerís field from the region. This producer had excellent crop performance, but yields differed across the field which is expected with the variable soil types that result from glaciated soils. The wheat yields from the more productive soils on this farmerís field are closely correlated with the higher yielding spring wheat varieties referenced in this report.
47-52 bu/A 63-69 bu/A 70-74 bu/A 53-56 bu/A 57-62 bu/A >75 bu/A <47 bu/A
Figure 1. Yield map of 2004 spring wheat generated from yield monitor, courtesy of Todd Jones.