Joel Ransom and Mohamed Mergoum. North Dakota State University, Loftsgard Hall, P.O. Box 5051, Lofstgard Hall, P.O. Box 5051, Fargo, ND 58105-5051
Research was initiated in 2004 to identify traits that were associated with high yield potential in hard red spring wheat varieties. Experiments were conducted at two locations and consisted of 30 genotypes grown under intensive management. Stem density, spikelet number, flag leaf width, plant height, kernel characteristics and yield were measured. Yield was high at both locations due to a favorable growing season, with the highest yield exceeding 7.5 Mg ha-1. Only four traits were significantly correlated to yield. At Prosper, plant height and protein were negatively correlated while thousand kernel weight was positively correlated to yield. In Ransom County, stems per unit area and thousand kernel weight were positively correlated with yield. The only trait consistently correlated to yield across the two locations was thousand kernel weight. At Prosper, when analyzed as a group, the 10 highest yielding genotypes produced significantly more stems per unit area when seeded at a higher seeding rate relative to the normal seeding rate, than the lowest 10 yielding genotypes. Additional research will focus on the role of stem numbers and kernel size in determining genotypic yield potential of spring wheat.
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