Abstract
The Kansas Agricultural Experiment Station conducts performance tests of winter wheat varieties at 16 locations across Kansas. Planting rates have been dictated by the results of long-term studies at each location. These tests traditionally have been planted on a constant seed-weight basis (equal weight of seed of each cultivar planted/unit area) or on a constant seedvolume basis (equal volume of seed of each cultivar planted/unit area, volume based on the average test weight of test entries). In the early 1980s, complaints were made that winter wheat performance tests in Kansas and neighboring states were biased against large-seeded entries. The argument was that planting on a volume or weight basis used more seeds/unit area for small-seeded varieties than for large-seeded varieties. This seemed reasonable, because Kansas sorghum, corn, and soybean tests all are planted on an equal viable seed-number basis or are planted heavy and thinned to uniform plant populations. However, little published evidence shows such a bias occurring in the hard red winter wheat region of the Great Plains, and there are published data to the contrary. A 13-year study in Nebraska reported an
Highlights
ProcedureTests were conducted at Hays, KS for the crop years 1988 and 1989. Identical tests were conducted at Hays and Colby, KS in 1990
This publication from the Kansas State University Agricultural Experiment Station and Cooperative Extension Service has been archived
These tests traditionally have been planted on a constant seed-weight basis or on a constant seedvolume basis
Summary
Tests were conducted at Hays, KS for the crop years 1988 and 1989. Identical tests were conducted at Hays and Colby, KS in 1990. Hays bulk, Hays small, Colby, and Manhattan sources, respectively. Seed of TAM 107 produced at Hays in 1988 was treatment by location interactions between the two nificant differences among the yields of treatments used for the 1989 test. Three sources of TAM 107 were used; two produced at Hays or Colby in 1989 and a third distributed by the Kansas Agricultural Experiment Station for use in the 1990 Kansas wheat variety performance test (designated the Manhattan source). The Colby source was large seed, and the Manhattan source was small seed The Hays source was subdivided as in 1988 and 1989, into large, bulk, and small fractions. Data from 1988 and 1989 were analyzed and are presented separately, but because there were no significant
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