2007 Grain Corn Hybrid Variety Performance Strip Trial
Powell Research and Extension Center
Mike Killen, UW Powell Research and Extension Center;
Sandy Frost, UW Cooperative Extension Service
The University of Wyoming, Powell Research and Extension Center in cooperation with local seed corn dealers conducted a study designed to evaluate the corn grain yield and quality characteristics of ten varieties. Varieties were planted in 0.64 acre strips and managed using the best management practices for the soil and growing conditions at the University of Wyoming Research and Extension Center in Powell, Wyoming during 2007.
Materials and Methods
The soil was a Garland clay loam (fine, mixed, mesic; Typic Haplargid)and had a cropping history of mixed grass and alfalfa hay (2006-1995). The study area was prepared for planting by fall plowing, disking, roller harrowing and leveling. Fertilizer was applied on 14 May, at the rate of 120 pounds N and 50 pounds P2O5 per acre, in the form of urea (46-0-0) and diammonium phosphate (11-52-0). On 15 May, ten corn varieties were established in plots 12 rows by 1280 ft feet using a John Deere Maximerge 7200 row crop planter with double disk openers set at a row spacing of 22 inches. Seeding depth was 1.5 inches, and the seeding rate was 34,000 plants per acre. Stand counts were taken on 22 June. Weeds were controlled by one post application of Glyphosate (Roundup) + AMS broadcast at 1 quart per acre on 9 June. A sidedress application of UAN 32% was applied at a rate of 100 pounds N per acre on 20 June. Furrow irrigations were 21 May, 29 June, 10 July, 18 July, 28 July, 13 August, 27 August and 24 September. Plots, 15 ft (8 rows) by 1263 ft were harvested using an IH 1440 Axial flow combine equipped with an 8 row 863 corn head on 8 November. Results are presented in Table 1.
Table 1. Agronomic Performance of Grain Corn Hybrid Varieties at Powell Research and Extension Center, 2007.
Results and Discussion
Cool weather following planting delayed development for several weeks. The remainder of the growing season was excellent. A frost, 29 deg F, on 9 September killed the upper leaves of the plants. A significant amount of header loss was observed at harvest. This may be due to dryer than normal grain at harvest which averaged 13.4%.
Acknowledgements and Contacts
The authors wish to thank the corn seed companies for their help and cooperation with this project. Cooperators included Curt Droogsma, Croplan Genetics; Joe Bridges, Simplot(Golden Harvest); Doug Ryerson, Monsanto(Dekalb) and John Hjelvik, Hjelvik Seeds(Dekalb).