Few experiments have studied how seeding rates affect agronomic performance and end‐use quality of modern wheat (Triticum aestivum L.) genotypes in the Great Plains. Higher grain yield and better quality grain production requires the use of appropriate seeding rates. During the 1997 and 1998 crop seasons, 20 winter wheat genotypes and experimental lines were evaluated at two locations (four environments) to assess seeding rate and genotype effects on agronomic performance and end‐use quality of wheat. Significant differences among environments, seeding rates, and genotypes, and some of their interactions were identified. Lower seeding rates decreased plant population (by 62.3%), grain yield (by 0.8 Mg ha−1), kernel weight (by 1.3 mg kernel−1), flour yield (by 0.8 g/100 g grain), mixing time (by 0.7 min), caused later flowering (by 2 d), and increased flour protein content (by 15 mg g−1) and mixing tolerance (1 unit). Environment × genotype interactions were significant for all the traits except plant population and mixing tolerance. On the basis of the four environments, the seeding rate × genotype interactions were nonsignificant for all traits except plant height. These results provide evidence that agronomic performance and end‐use quality traits are greatly influenced by the environmental conditions and less so by seeding rates. Seeding rate affected plant population, days to flowering, plant height, grain yield, kernel weight, flour yield, flour protein, and mixing time and tolerance of wheat; therefore, seeding rate should be considered as a factor in obtaining higher grain yields with good end‐use quality.

Scheromm et al., 1992; Blue et al., 1990;Johnson et al., 1988). Few experiments have studied how seeding rates affect agronomicSeeding rate has long been studied as an integral part performance and end-use quality of modern wheat (Triticum aestivum of wheat production and productivity. Optimal seeding L.) genotypes in the Great Plains. Higher grain yield and better quality rate has been shown to be higher in high rainfall and grain production requires the use of appropriate seeding rates. During irrigated environments (Quisenberry, 1928). Kiesselthe 1997 and 1998 crop seasons, 20 winter wheat genotypes and experibach and Sprague (1926) reported a linear increase in mental lines were evaluated at two locations (four environments) to grain yield as seeding rate increased from 34 to 101 kg assess seeding rate and genotype effects on agronomic performance and end-use quality of wheat. Significant differences among environ-ha Ϫ1 and concluded that a rate of 84 to 101 kg ha Ϫ1 ments, seeding rates, and genotypes, and some of their interactions was most practical for eastern Nebraska. Johnson et al. were identified. Lower seeding rates decreased plant population (by (1965) reported that thinly seeded plots (10, 20, and 40 62.3%), grain yield (by 0.8 Mg ha Ϫ1 ), kernel weight (by 1.3 mg kerkg ha Ϫ1 ), when compared with 81 kg ha Ϫ1 at 30-cm-row nel Ϫ1 ), flour yield (by 0.8 g/100 g grain), mixing time (by 0.7 min), spacing, led to later maturity and more winter killingcaused later flowering (by 2 d), and increased flour protein content in NE. Johnson et al. (1966) with a similar trial grown (by 15 mg g Ϫ1 ) and mixing tolerance (1 unit). Environment ϫ genotype under drought conditions at North Platte found a interactions were significant for all the traits except plant population genotype ϫ seeding rate interaction and the 40 kg ha Ϫ1 and mixing tolerance. On the basis of the four environments, the seeding rate producing the highest yields. Stoltenberg seeding rate ϫ genotype interactions were nonsignificant for all traits (1968), in a 2-yr study using genotypes grown in 30-cm except plant height. These results provide evidence that agronomic rows, recommended seeding rates of 17 to 22 kg ha Ϫ1 performance and end-use quality traits are greatly influenced by the for winter wheat in western NE, 34 to 39 kg ha Ϫ1 rates environmental conditions and less so by seeding rates. Seeding rate in central NE, and no less than 67 kg ha Ϫ1 for eastern affected plant population, days to flowering, plant height, grain yield, NE. Koycu (1968) at Lincoln, NE, reported that 60 kg kernel weight, flour yield, flour protein, and mixing time and tolerance of wheat; therefore, seeding rate should be considered as a factor in Published in Crop Sci

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