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WHEAT HEAD COUNT

WHEAT HEAD COUNT ASSOCIATION WITH GRAIN YIELD return to table of contents by Blake Kasten, Agronomy Intern, Scott Eversgerd, Field Agronomist, and Kirk Reese, Agronomy Research Manager OBJECTIVES • Determine association of wheat head count per foot of row to grain yield. RESULTS • There was no clear association between head count and yield in this study (Figure 1). • The highest yielding variety (Pioneer ® variety 25R46) had the lowest head count per foot of row. The lowest yielding variety (Pioneer ® variety 25R78) had the second highest head count in the trial (Figure 2). • Factors like test weight, tillering, and head size may have had an influence on yield in addition to number of heads per foot and will be evaluated in 2016. 2015 wheat trial location in southern Illinois. STUDY DESCRIPTION • Head counts were collected at 17 wheat trial locations in Illinois, Indiana, and Missouri during 2015. • The apparatus shown below was used to ensure a consistent row length for head counts. • Six Pioneer ® brand soft red winter wheat varieties were evaluated and grain yield measured. »» Varieties: 25R40, 25R46, 25R50, 25R72, 25R77, and 25R78 Yield (bu/acre) 140 y = -0.0156x + 79.731 120 100 80 60 40 20 0 40 50 60 70 80 Head Count (number/ft of row) Figure 1. Regression of grain yield and head count, 11 locations. 90 82.0 Yield Head Count (number/ft of row) 86.4 Yield (bu/acre) 80 70 60 70.9 61.1 60.3 76.9 75.1 76.5 58.6 58.4 57.9 56.9 50 25R77 25R78 25R72 25R50 25R40 25R46 Variety Apparatus used to collect wheat head counts. Figure 2. Average yield and head count of wheat varieties in descending head count order. 156

PIONEER PREMIUM SEED TREATMENT OFFERING FOR SOFT RED WINTER WHEAT by Keith O’Bryan, Ph.D., Agronomy Research Manager - Seed Treatments return to table of contents INTRODUCTION AND OBJECTIVE • Pioneer Premium Seed Treatment (PPST) offering for wheat includes Dividend Extreme ® fungicide seed treatment (mefenoxam and difenconazole) and Vibrance ® fungicide seed treatment (sedaxane), plus Gaucho ® insecticide seed treatment (imidacloprid). Untreated • Dividend Extreme and Vibrance fungicide seed treatments (FST) for wheat provides protection against numerous seed borne, soil borne, and foliar diseases, including Pythium, Rhizoctonia, and dwarf bunt. The addition of sedaxane FST provides enhanced activity against Rhizoctonia and Fusarium. • Gaucho insecticide seed treatment (IST) provides earlyseason protection of seedlings against injury from Hessian fly and wireworm. • Research trials were conducted over five years from 2012 through 2016 to evaluate performance of Pioneer Premium Seed Treatment offerings in soft red winter wheat. STUDY DESCRIPTION Years: 2012-2016 Locations: Treatments: 1. Untreated 37 DuPont Pioneer research locations 2. Dividend Extreme and Vibrance fungicide seed treatments (2.8 fl oz/cwt) + Gaucho insecticide seed treatment (0.8 fl oz/cwt) Plots: 18 ft. long; 6- to 7-inch row spacing Varieties: 2 adapted varieties per location Replications: 6 replications per treatment per location PPST RESULTS Yield (bu/acre) 94 92 90 88 86 84 82 80 PPST 2.3 bu/acre Advantage vs. Untreated (p value

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