1998 state-wide variety testing program spring grains at North Willamette Valley (Scio).

notes: All seed was treated with Vitavax (fungicide) and Gaucho (insecticide) except where noted.

1000 kernel weight measured on one rep only.

The North Willamette Valley site is on a red hill soil. Wheat yields in our trials have been consistently low on these soils over the years. In an attempt to determine the cause of the low yields, phosphorus (P) and sulfur (S) treatments were added to Penawawa plots. There was a significant response to phosphorus, but not to sulfur. The Bray P1 soil test for phosphorus was 44 ppm, which is considered high. The response to phosphorus was therefore unexpected. We will investigate the P response further in 1999.
Variety/line Market class Yield (bu/a) Test weight (lb/bu) Protein (percent) Height (in) 1000 K (g)

Drummond oat 56 35.0 16.1 66 27.1
Cayuse oat 53 30.5 14.6 76 24.5
Croa 35 oat 51 36.4 18.4 57 31.0
Penawawa (+P) SW 48 60.7 11.3 72 29.9
Wawawai SW 47 62.6 11.8 83 36.9
WA7850 SW 46 60.7 11.4 76 27.8
IDO462 (Jefferson) HR 45 63.2 13.4 71 30.4
OR4920307 HW 43 58.4 12.6 71 28.2
Pomerelle SW 41 58.0 11.6 72 22.7
WPB BZ 992-108 SW 41 59.6 11.9 70 31.1
Penawawa (+S) SW 40 59.9 11.5 69 27.4
OR4870255 HW 40 62.5 12.5 71 29.9
WA7802 HR 40 62.6 14.6 75 36.1
OR942845 SW 39 60.7 12.5 77 25.9
IDO533 HW 39 59.4 12.4 67 26.5
IDO523 HW 39 58.8 12.4 69 25.7
IDO505 SW 38 60.6 11.3 69 29.4
Alpowa SW 38 59.1 11.5 74 26.0
Alpowa (no Gaucho) SW 37 58.8 11.5 74 24.8
IDO377S HW 37 60.9 12.8 73 26.8
IDO506 SW 36 59.8 11.7 67 27.8
OR4870453 HW 36 56.6 12.9 71 22.4
Whitebird SW 36 60.4 11.2 68 26.4
OR3900362 HR 36 60.7 13.5 69 30.1
Penawawa SW 35 59.5 11.5 66 26.6
WPB936 HR 33 62.6 14.0 58 34.7
WPB BZ 987-331 HR 32 62.0 15.0 68 43.2
Yecora Rojo HR 30 63.1 15.0 49 36.9

Average   41 56.8 12.9 70 29.2
PLSD (5%)   7 1.2 0.5 8 NA
PLSD (10%)   6 1.0 0.4 7 NA
CV   11 1 2 7 NA
P-value   0.00 0.00 0.00 0.00 NA