These studies compared giant hill strains of Russet Norkotah and Umatilla
Russet to the parent varieties. Selections were initially based on late maturity and
increased vine vigor. Subsequent evaluations emphasized yield and quality
parameters in comparison to the parent varieties.
Giant hills were collected from the Columbia Basin and Central Oregon in
1999. Seed was tested and increased in a greenhouse during the winter of 1999 and
in the field in 2000. Clones were inspected for viruses and other diseases in both
years.
Replicated performance trials were conducted at the Hermiston Agricultural
Research and Extension Center in the Columbia Basin and at the Central Oregon
Agricultural Research Center, near Madras, in 2001. Trials were grown using
commercial management practices common to the areas. Tubers from the Madras
trial were retained for use in future plantings.
Relative yields of Russet Norkotah strains differed drastically between sites
even though the growing seasons were similar in length. Several Russet Norkotah
strains preformed better than the parent variety at Madras when the strains achieved
good vine growth and the parent variety did not. Vine growth was subnormal at
Madras in 2001 primarily due to delayed emergence and the subsequent short
growing season. Few performance differences and no advantages were evident when
Russet Norkotah strains were grown in the Columbia Basin under conditions with
less environmental stress than usual.
All strains of Umatilla Russet grown under a long season in the Columbia
Basin out-yielded the parent variety; however, many strains also produced a high
percentage of malformed tubers. In general, Umatilla Russet strains failed to
produce adequate yields and tubers of acceptable size when delayed emergence
shortened the growing season at Madras. At Madras, strains of Umatilla Russet with
high biomass tended to have lower yields while strains of Russet Norkotah with high
biomass tended to have high yields.
Some strains performed better than the parent varieties at the two trial sites.
Superior strains have been submitted to the Oregon Potato Variety Development
Program and Oregon Foundation Potato Seed Project for further evaluation. / Graduation date: 2002
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/31048 |
| Date | 15 March 2002 |
| Creators | Brunick, Robert L. |
| Contributors | Mosley, Alvin R. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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