2007 - Potatoes at WSU - Washington State University

ERT
2007 Early Harvest Regional Trial
Location: WSU Research Center - Othello, WA
Planting Date: April 4 Vine Kill Date: July 23
Harvest Date: Aug 6 Days Grown: 110
Fertility: 278-175-400
In-Row Spacing: 12 in.
Regional trials are conducted throughout the western region of the United States, including
Washington. Entries in the Regional Trial are chosen by a coordinating committee and are grown
for both early (Early Regional) and full (Late Regional) season harvest. The 2007 early harvest
trial compared 4 local reference varieties to 16 new clones on the WSU Othello Research Station.
Overall, most clones had a nice, typy shape; the reference varieties were among the ugliest and had
the most non-uniform shape. The following is a summary of the Washington field and post-harvest
results. For additional information, see the grading comments and merit scores near front of book.
Fresh Market Standouts: CO97138-7Ru, CO97138-3Ru, AOTX95265-3Ru
Process Market Standouts: AO96141-3, AO96164-1, A95409-1
Suggested Discards: AC96052-1Ru, CO95172-3Ru
Standcounts
‣ 40 Day
Fast emergence: A95409-1, A96104-2, Ranger, Russet Burbank, Norkotah, (all > 97%)
Slow emergence: AC96052-1Ru (15%), AOA95155-7 (32%), and A97287-6 (57%), all other
entries were > 67%.
‣ 50 Day
Full emergence: Most entries had > 95% of plants emerged at 50 DAP.
Poor emergence: AC96052-1Ru (92%) and CO97138-3Ru (93%).
Plant and Tuber Growth & Development
‣ Above Ground Stem Number Per Plant
Most: TXA549-1Ru (2.4) and AO96141-3 (2.3)
Least: A97287-6 (1.3).
‣ Average Tuber Number Per Plant
Most: Norkotah (7.7), CO97087-2Ru, and TXA549-1Ru (7.0).
Least: Shepody (4.5), AO96164-1 (4.7), and A95409-1 (4.8).
‣ Average Tuber Size (oz)
Largest: AO96164-1 (9.8), Shepody (9.7), and A95409-1 (9.5).
Smallest: AC96052-1Ru (4.5), AOA95155-7 (5.0), and AOA95154-1 (5.2).
‣ Undersized Tubers (< 4 oz)
Most: AC96052-1Ru, AOA95154-1, and AOA95155-7.
Fewest: A95409-1 and Shepody.
2007 Potato Cultivar Evaluations 68 WSU Potato Research Group