41
Potato Variety Screening Trials
K.A. Rykbost and J. Maxwell'
INTRODUCTION
The Oregon potato variety development program screened more than 60,000
seedling tubers in 1991. Single-hill screening is conducted at Powell Butte
and Ontario. KES participates in the evaluation of selections in the third
generation and beyond in preliminary, statewide, and regional trials. Selections are screened in a preliminary trial for one year at four locations.
Lines advanced are evaluated for up to three years in the statewide trial at
four locations. Surviving selections with processing potential are evaluated
more intensively at three locations in tri-state trials for two years. The
final stage of formal evaluation is regional trials conducted at 11 locations
in 7 western states. Graduates of the three-year regional trials usually
undergo one or two years of commercial scale evaluation prior to official
naming and release. Consequently, selections are typically evaluated for 12
to 14 years prior to release.
From the preliminary trial forward more than 50 characteristics are
monitored across multiple locations. Yield potential, while very important,
is only one of many characteristics considered in decisions regarding disposition of lines evaluated. Data presented in this report is limited to less
than one-half of the observations recorded on individual selections.
PROCEDURES
All variety screening trials were conducted in randomized complete block
experimental designs. Trial areas were fumigated with Telone II at 20 gpa on
October 17, 1990. Di-Syston was applied in the seed furrow at 3.0 lbs ai/A.
Monitor was applied aerially at 0.75 lbs ai/A on July 19 and August 10. Herbicides included Eptam, applied at 3.5 lbs ai/A and incorporated with a rolling
cultivator on May 31, and metribuzin, applied aerially at 0.3 lbs ai/A on July
10. Standard foliar fungicides were applied aerially at labelled rates on July
10, July 19, August 10, and September 4. Vines were desiccated with diquat,
applied with a conventional ground sprayer at 1.0 pt/A on September 6. Vines
were shredded with a rotobeater prior to harvest.
All trials were conducted in a two-year rotation of potatoes and spring
cereal grains. Gypsum was applied at 1.0 ton/A before secondary tillage.
Fertilizer included 600 lbs/A of 16-16-16, banded on both sides of rows at
planting and 50 lbs N/A applied as solution 32 on May 31. Crops received
approximately 20 inches of irrigation water during the growing season.
Irrigation was applied twice weekly with solid-set sprinklers on a 40-foot x
48-foot spacing to replenish 60 to 90 percent of pan evaporation, depending on
plant growth stage.
1/ Superintendent/Associate Professor and Biological Sciences Research
Technician, respectively, Klamath Experiment Station, Klamath Falls, OR.
Acknowledgments: Partial funding for variety development by the Oregon Potato
Commission, the CSRS, and ARS is gratefully recognized.
42
All seed was hand cut, treated with thiophanate-methyl fungicide, and
suberized at least 10 days prior to planting. Potatoes were planted with a
two-row assisted feed planter with 32-inch row spacing. Seed spacing in the
row was 8.7 inches for all trials. Plant stands were monitored in all trials
on June 11, June 18, and June 24. Vine vigor ratings were recorded on June
24. Vine maturity ratings were made on September 5.
Potatoes were harvested with a one-row digger-bagger. Samples were
tagged and stored until grading was done in late October. Specific gravity
was determined by the weight-in-air, weight-in-water method using a 10-pound
sample of U.S. No. is in the 6- to 12-ounce size fraction. Internal defects
were observed by cutting 10 of the largest tubers from each plot. U.S. No. 1
yields were not adjusted for surface blemishes such as scab, elephant hide, or
rhizoctonia, or for internal defects such as hollow-heart, brown center, or
internal brown spot. Statistical analyses of data were performed using MSU
Stat software. Additional procedural details are provided in the description
of individual trials.
Preliminary Yield Trial
Five standard varieties and 79 numbered selections were planted in 20hill plots with two replications on May 16. Potatoes were harvested on
September 27. All tubers were saved for grading.
Oregon Statewide Trial
Five standard varieties and 41 numbered selections were planted on May
20. Single-row, 30-hill plots were replicated four times. Potatoes were
harvested on September 26. Total weights were determined in the field.
Sixty-pound samples were saved for grading.
Western Regional Trial
The trial included five standard varieties and 16 numbered selections.
Single-row, 30-hill plots with four replications were planted on May 16.
Potatoes were harvested on September 25. All tubers were weighed in the
field. Sixty-pound samples were saved for grading.
RESULTS AND DISCUSSION
Preliminary Yield Trial
Early crop development was delayed in all trials by cool weather through
the end of June. Plant stands were excellent in all selections (Table 1) but
canopy development was about 10 days behind normal by July 1. A rapid transition to high temperatures during the first week of July resulted in the
development of heat sprouts in many selections. High temperatures persisted
through harvest. Tuber set was below normal in standard varieties as evidenced by low yields of tubers under 4 ounces (Table 2). Tuber quality was
generally quite good, however, with relatively low percentages of second
growth, growth cracks, misshaped tubers, and internal defects. With the
exception of hollow heart in very large tubers of some selections, internal
tuber disorders were minimal. No root-knot nematode or corky ringspot
infections were detected in any of the selections.
Tuber skin development was abnormal in many of the russetted selections.
Heavy and coarse netting was consistently noted in Russet Burbank, which
43
typically exhibits a medium net. Elephant hide occurred in several selections
with heavy netting characteristics.
The standard russet varieties produced lower total yields, lower yields
of tubers under 4 ounces, and lower yields of tubers over 12 ounces than in
1990. Relatively low specific gravity (Table 1) may be an indication of
delayed crop maturity or crop stress resulting from extended periods of high
temperature.
Russet Burbank produced 100 cwt/A less total yield and 60 cwt/A less
yield of No. is than in a similar trial in 1990. Lemhi, Norgold, and Norkotah
were slightly higher than Russet Burbank in yield of No. ls. Yield variability between selections was very large. Fifteen selections exceeded Russet
Burbank in yield of No. is by more than 50 percent. The top five selections
at KES in yield of No. is were A08555-201, A083155-4, A083141-5, A79341-3, and
A084022-108.
Performance of selections varied widely between trial locations. Russet
Burbank yield of No. is ranked 60th at KES but 26th or better at Hermiston,
Powell Butte, and Ontario. Conversely, the A08555-201 selection was ranked
1st at KES and no better than 30th at other locations. Averaged over four
locations the top five KES selections were ranked 17, 12, 5, 4, and 6,
respectively, in yield of No. is.
A total of nineteen selections were retained for testing in the 1992
state-wide trial. These included 12 of the top 14 in yield of No. is at KES.
Several exhibited excellent processing quality but others are clearly unsuited
for processing. Culinary quality evaluations at KES revealed undesirable
flavor in two selections retained; A084022-108, and A08515-201. It will be
interesting to see if these undesirable flaws are detected again in 1992.
Oregon Statewide Trial
Crop development was delayed as observed in the preliminary trial (Table
3). Plant stands were good to excellent. A heavy and coarse skin texture was
noted in many of the russetted selections. Yields of standard varieties were
considerably lower in this trial than in the preliminary trial (Table 4). A
four-day delay in planting and larger plot size with more replications
probably accounts for a portion of the yield differences. Yields were about
85 percent of those observed in the preliminary trial for Russet Burbank,
Lemhi, and Norgold. Norkotah performance was very poor. Norkotah has
historically produced better yields than Russet Burbank at KES.
Entry numbers 6 through 14 are advanced selections being evaluated in
tri-state, regional, or commercial testing. Entries 15 through 19 were in the
state-wide trial for the second year. All other entries were in this trial
for the first time in 1991. Several of the advanced selections performed well
at KES and other locations. Century Russet achieved the highest yield at KES
but ranked 12th at Hermiston and 18th at Ontario and Powell Butte. A74212-1E
ranked 4th at KES and 3rd averaged over four locations. This early selection
of Century Russet will be evaluated in the regional trial in 1992. C008014-1
and A082611-7 have completed three years of regional evaluation and are being
evaluated commercially. Neither of these selections performed well at KES in
this trial. A082283-1 has been discarded due to serious blackspot susceptibility but will be used as a breeding parent because it has resistance to
44
corky ringspot caused by tobacco rattle virus. A082281-1 was also dropped
from the regional trial in 1991. A083037-10 produced relatively high yields
at all locations and will be retained in the regional trial in 1992.
CO083008-1 is also being retained for regional evaluation. N002904-7 was
advanced from the tri-state trial to the 1992 regional trial.
Outstanding yields were observed at all locations for A085165-1 and
A085031-7, ranking 1 and 2, respectively, in yields of No. is over four
locations. Both selections produced high yields in 1990 trials. A085165-1
has excellent appearance and is considered a fresh market selection. A085031-7
has processing potential and will be entered in the 1992 tri-state trial.
Five additional selections were retained for the 1992 statewide trial. None
of these were particularly outstanding at KES. Culinary tests indicated a
flavor problem in CO086149-4. C0086107-1 is a very attractive red-skinned
selection that will be evaluated in a red-skinned variety trial at KES in 1992.
Western Regional Trial
Plant emergence and early crop development was similar to results in preliminary and statewide trials (Table 5). C081082-1 had very poor stands and
low yields at all locations. All other lines achieved good stands at KES.
Century Russet was included in the trial inadvertently. It was intended that
the early selection, A74212-1E, would be evaluated. As a result of a seed
labelling error, all project cooperators received Century Russet instead of
A74212-1E seed.
Russet Burbank and Lemhi achieved yields equivalent to those observed in
the preliminary trial (Table 6). Norkotah produced low yields in the regional
trial, as was observed in the statewide trial. Shepody, grown in an adjacent
field which was not treated with metribuzin, produced over 300 cwt/A of No.
is. The yields of Shepody and ND2224-5R observed in this trial were clearly
influenced by metribuzin injury.
Century Russet achieved the highest yield of No. is at KES and averaged
over 11 locations in 7 states. A083037-10 was second highest at KES and
across all locations. The red-skinned A82705-1 produced a high yield at KES
but tuber size was excessively large for red markets. KES was the only
location where A82705-1 achieved significantly higher yield than Red LaSoda.
Century Russet, AC7869-17, and A082611-7 have completed three years of
evaluation in the regional trial and are being evaluated in commercial
production. A082283-1, AC81198-11, N0671-4 RUSS, and C081082-1 have been
discarded. N01538-1 RUSS is being considered for naming and release by North
Dakota. The other selections will be retained in the regional trial for 1992.
CONCLUSIONS
A number of attractive russetted selections were identified at each trial
level. Many of them are superior to Russet Burbank and other standards in
yield, dry matter content, fry color, and other internal tuber quality
characteristics. The Oregon potato variety development program has developed
several selections which appear to be good candidates for release. This
program will continue in its present format. Increased emphasis on disease
resistance screening is planned in anticipation of future losses of pesticides
presently being relied on for suppression of disease and pest problems.
45
Table 1. Performance of entries in the Preliminary Yield Trial, Klamath Experiment
Station, OR. 1991.
Entry
No.
Selection
Stand
Vigor
rating'
Maturity
rating'
Specific
gravity
H.H.'
Comments`
-%-
- % Russet Burbank
Lemhi
Norgold
Norkotah
Norchip
100
93
93
100
100
3.5
2.0
3.5
4.5
4.5
2.0
2.0
1.0
1.0
2.2
1.082
1.084
1.071
1.074
1.076
0
20
25
5
0
Rough
Coarse
Small
Nice
Small
6
7
8
9
10
NDO 3675-1
A088011-10
A088011-11
A088011-12
A088011-13
93
100
100
98
95
3.0
3.0
4.0
3.5
3.5
1.8
1.5
2.0
2.0
1.5
1.069
1.078
1.079
1.070
1.073
10
0
0
5
5
Light YF
EH, rough
Rough, ugly
Coarse
11
12
13
14
15
A086097-1
A086097-3
A085130-1
A085027-5
A083202-5
85
100
85
98
95
3.5
4.0
1.5
2.0
3.0
1.0
1.0
2.0
2.5
2.0
1.080
1.071
1.079
1.079
1.079
5
10
40
40
40
16
17
18
19
20
A083202-6
*A083200-2
A083184-1
A083155-2
*A083155-4
98
100
100
90
95
2.5
3.5
3.5
2.5
3.5
1.8
3.5
3.0
2.5
2.0
1.075
1.077
1.089
1.079
1.090
0
5
50
60
30
YF, skinning
Crooked
Coarse
Heavy net
21
22
23
24
25
*A083155-5
*A083142-3
*A083141-5
A083177-4
A083116-2
98
95
88
100
93
3.5
3.0
3.5
3.5
3.5
2.5
2.5
2.5
3.3
4.0
1.084
1.076
1.088
1.080
1.085
5
10
15
35
0
Coarse, EH
Heavy net
Flat, folded
Rough
EH, IPS
26
27
28
29
30
A083113-1
*A083113-4
A083103-2
A083103-5
A083103-6
100
85
98
100
98
4.0
3.0
3.0
3.0
2.5
2.3
3.0
2.5
1.0
1.3
1.088
1.083
1.078
1.078
1.077
5
25
0
0
15
Crooked
Coarse
Crooked
Fair
Poor
1
2
3
4
5
Fair, YF
EH, ugly
EH, rough
Poor
31
32
33
34
35
A083103-10
A083100-2
A083096-1
A083096-3
A083039-1
100
88
100
93
100
2.5
3.0
3.5
3.0
4.0
3.0
1.0
1.3
1.5
1.0
1.071
1.068
1.072
1.067
1.080
15
0
0
20
0
Coarse
Flat, folded
Small
Coarse
Small
36
37
38
39
40
A083011-12
A083010-4
A083002-1
A080203-11
*A080191-7
93
100
100
93
95
4.0
4.0
2.0
3.0
3.0
2.8
2.0
3.5
1.5
3.5
1.084
1.079
1.085
1.076
1.088
20
0
0
15
20
GC, light YF
Heavy net, flat
EH, GC
Too round
Fair
41
42
43
44
45
A080044-1
A078018-1
A078018-2
A079053-7
*A080004-2
100
98
83
95
98
4.0
3.0
2.0
2.5
3.5
3.0
3.8
3.5
3.0
3.0
1.077
1.087
1.083
1.071
1.080
5
25
25
45
20
Fair
IPS, heavy net
Heavy net, soft
Coarse
46
Table 1. Performance of entries in the Preliminary Yield Trial, Klamath Experiment
Station, OR. 1991. (contd)
Entry
No.
Selection
Stand
Vigor
rating'
Maturity Specific
rating' gravity H.H.'
- % -
Comments'
- % -
46
*A080093-3
A080175-1
A083072-3
A083072-5
A083176-1
100
93
100
95
100
3.0
3.5
2.0
3.0
3.5
3.0
1.0
2.5
2.5
2.0
1.079
1.075
1.078
1.076
1.065
35
0
0
0
0
Fair
Heavy net
GC
Rough
51
52
53
54
55
*A083258-7
*A083171-5
*A083011-15
*A084022-108
*A084023-118
100
100
98
98
100
3.5
2.0
3.5
3.5
3.0
1.5
2.5
2.0
3.0
2.0
1.078
1.073
1.082
1.087
1.076
0
5
0
0
25
Fair
Fair, YF
Fair
Fair
56
57
58
59
60
A084038-105
A084275-105
A083107-103
*A79341-3
A084738-177
100
90
95
100
100
3.0
1.5
3.0
4.0
2.5
2.5
3.0
3.5
2.0
2.5
1.098
1.080
1.081
1.087
1.080
35
45
5
15
0
Rough
Skinning
Coarse
Flat, smooth, YF
61
62
63
64
65
A085042-103
A085330-107
A085341-103
207-2
*A080202-214
98
100
93
100
95
2.5
3.5
2.0
3.5
3.5
2.5
3.0
3.0
3.5
2.0
1.087
1.086
1.083
1.085
1.086
0
0
25
10
0
Nice
EH, ugly
Coarse, GC
EH, small
Too round
66
67
68
69
70
A083221-202
ND02725-3
ND03826-2
A081784-201
A084515-201
100
98
88
98
100
2.5
2.5
3.0
2.0
3.0
2.0
2.0
1.0
3.5
3.0
1.081
1.067
1.066
1.075
1.080
5
0
15
0
10
Poor
EH, heavy net
EH, ugly
Coarse, YF
100
100
95
98
98
3.5
3.5
3.0
3.5
2.5
3.0
2.5
3.5
3.0
3.0
1.077
1.076
1.085
1.081
1.086
0
0
55
0
5
Light net, small
Rough
Light net
Small
Red eyes, YF
EH
Rough
Small
Coarse, IPS
47
48
49
50
71
72
73
74
75
A08514-205
*A08515-201
A08518-201
A08518-205
*A08555-201
76
77
78
79
80
A085182-201
A087102-203
A087103-203
A087105-201
A087126-206
93
100
100
98
100
4.0
3.0
3.5
3.0
4.0
2.5
2.5
1.5
3.5
3.0
1.081
1.083
1.079
1.084
1.092
20
35
0
75
15
81
82
83
84
A087126-207
*A087458-202
A087458-208
A087458-210
95
98
98
98
3.5
4.0
3.5
4.0
1.5
3.5
3.5
2.0
1.080
1.091
1.090
1.079
0
0
0
5
96
3.2
2.4
1.080
13
Average
1/
2/
3/
4/
Too round
Light net
Light net
Vigor rating: (1 - small, weak; 5 - large robust)
Maturity rating: (1 - dead; 5 - green, lush)
H.H.: Hollow heart - percent in 10 largest tubers/sample
Comments: EH - elephant hide; GC - growth cracks; IPS - internal purple spots;
YF - yellow flesh.
* Advanced to the Statewide Trial for 1992
47
Table 2. Tuber yield by grade for entries in the Preliminary Yield Trial,
Klamath Experiment Station, OR. 1991.
Entry
No.
Selection
Yield U.S. No. is
4-12 oz >12 oz Total Rank
cwt/A
Bs
2s
Yield
Total
%
---- cwt/A ----
Rank
Russet Burbank
Lemhi
Norgold
Norkotah
Norchip
301
230
336
347
344
22
118
0
41
0
323
348
336
388
344
60
53
58
37
54
75
86
87
84
70
34
9
29
62
106
34
23
0
5
15
427
404
383
459
485
59
64
70
51
42
6
7
8
9
10
NDO 3675-1
A088011-10
A088011-11
A088011-12
A088011-13
207
290
184
191
186
160
84
14
97
28
367
374
198
288
214
44
41
84
70
81
78
77
68
59
77
15
66
50
10
42
48
29
14
84
6
470
483
287
482
275
48
45
81
46
84
11
12
13
14
15
A086097-1
A086097-3
A085130-1
A085027-5
A083202-5
298
273
240
299
301
13
71
24
152
67
311
344
264
451
368
62
55
75
21
43
70
84
72
84
69
108
43
24
14
132
0
7
43
36
20
439
405
365
534
529
56
63
73
26
28
16
17
18
19
20
A083202-6
*A083200-2
A083184-1
A083155-2
*A083155-4
308
398
368
269
441
16
113
74
199
159
324
511
442
468
600
59
14
23
18
2
81
79
76
76
81
55
43
28
6
64
15
38
30
66
10
400
645
580
611
733
66
9
17
11
2
21
22
23
24
25
*A083155-5
*A083142-3
*A083141-5
A083177-4
A083116-2
369
360
382
328
242
149
171
195
101
166
518
531
577
429
408
10
8
3
27
32
79
91
87
83
73
68
32
39
31
34
43
0
32
0
81
658
582
652
515
558
7
16
5
33
20
26
27
28
29
30
A083113-1
*A083113-4
A083103-2
A083103-5
A083103-6
337
193
299
263
449
157
225
91
32
79
494
418
390
295
528
15
29
36
66
9
82
82
75
83
90
28
11
76
45
17
53
23
12
6
22
599
506
515
354
583
14
37
34
74
15
1
2
3
4
5
31
32
33
34
35
A083103-10
A083100-2
A083096-1
A083096-3
A083039-1
276
358
292
244
285
88
30
46
48
6
364
388
338
292
291
47
38
57
35
69
84
82
74
79
73
34
54
102
35
96
16
16
2
28
0
429
472
451
369
398
57
47
52
72
67
36
37
38
39
40
A083011-12
A083010-4
A083002-1
A080203-11
*A080191-7
326
325
277
264
441
93
33
38
10
113
419
358
315
274
554
28
49
61
74
6
76
72
62
80
85
50
101
83
65
38
59
10
54
0
0
551
497
506
341
646
22
38
36
76
8
41
42
43
44
45
A080044-1
A078018-1
A078018-2
A079053-7
*A080004-2
408
323
200
338
347
53
58
166
38
167
461
381
366
376
514
19
39
45
40
13
85
81
92
77
84
39
31
19
21
38
6
17
22
25
25
538
467
396
483
610
25
49
68
44
13
48
Table 2. Tuber yield by grade for entries in the Preliminary Yield Trial,
Klamath Experiment Station, OR. 1991. (contd)
Entry
No.
Selection
Yield U.S. No. is
4-12 oz >12 oz Total Rank
cwt/A
Bs
%
---
2s
Yield
Total
Rank
cwt/A ----
46
47
48
49
50
*A080093-3
A080175-1
A083072-3
A083072-5
A083176-1
326
188
182
238
273
77
12
36
48
20
403
200
218
286
293
33
83
79
71
67
70
71
69
71
66
116
67
49
47
106
23
0
20
43
10
570
280
313
402
442
19
83
78
65
54
51
52
53
54
55
*A083258-7
*A083171-5
*A083011-15
*A084022-108
*A084023-118
371
329
339
280
384
89
37
13
278
87
460
366
352
558
471
20
46
51
5
16
88
82
72
87
85
27
72
105
28
46
13
3
20
9
3
521
446
487
640
550
29
53
41
10
23
56
57
58
59
60
A084038-105
A084275-105
A083107-103
*A79341-3
A084738-177
225
347
373
316
287
21
85
59
248
159
246
432
432
564
446
77
25
26
4
22
70
75
77
85
85
64
40
86
16
22
23
54
7
12
3
351
572
555
656
521
75
18
21
6
30
61
62
63
64
65
A085042-103
A085330-107
A085341-103
207-2
*A080202-214
327
289
265
292
409
28
55
148
0
30
355
344
413
292
439
50
56
30
68
24
85
74
76
59
84
23
45
20
167
52
20
37
62
6
18
417
461
541
488
519
60
50
24
40
31
66
67
68
69
70
A083221-202
ND02725-3
ND03826-2
A081784-201
A084515-201
209
207
205
229
235
10
6
10
71
318
219
213
215
300
553
78
82
80
64
7
70
75
70
80
81
52
50
64
11
26
22
10
8
22
61
310
283
306
371
681
79
82
80
71
4
276
215
268
259
513
0
301
38
0
137
276
516
306
259
650
73
11
63
76
1
82
65
73
60
91
60
16
67
146
52
0
132
25
0
0
335
783
417
428
711
77
1
61
58
3
71
72
73
74
75
A08514-205
*A08515-201
A08518-201
A08518-205
*A08555-201
76
77
78
79
80
A085182-201
A087102-203
A087103-203
A087105-201
A087126-206
277
374
283
264
335
0
39
15
206
15
277
413
298
470
350
72
31
65
17
52
68
84
75
88
67
77
71
78
4
91
21
0
3
34
47
406
489
394
532
517
62
39
69
27
32
81
82
83
84
A087126-207
*A087458-202
A087458-208
A087458-210
297
326
369
378
62
189
0
25
359
515
369
403
48
12
42
34
81
84
72
83
74
24
96
59
3
29
0
0
439
611
508
484
55
12
35
43
301
80
381
78
53
22
486
Average
* Advanced to the Statewide Trial for 1992.
49
Table 3. Performance of entries in the Oregon Statewide Trial, Klamath Experiment
Station, OR. 1991.
Entry
No.
Selection
Stand
Vigor
rating'
Maturity Specific
rating' gravity M.N.'
_ % _
Comments'
-%-
5
23
5
23
5
Rough
Coarse
Small
Nice
1
2
3
4
5
Russet Burbank
Lemhi
Norgold
Norkotah
Norchip
99
96
96
96
88
3.0
2.5
3.5
2.8
2.8
2.1
2.3
1.3
1.3
1.8
1.083
1.083
1.072
1.070
1.075
6
7
8
9
10
*A74212-1E
*Century Russet
*C008014-1
A082283-1
*A082611-7
98
95
88
98
92
2.3
2.5
2.3
2.8
2.5
2.6
4.5
2.8
3.8
2.5
1.078
1.078
1.077
1.087
1.088
0
0
10
33
5
Skinning
Skinning
Coarse
Rough, ugly
Pointy
11
12
13
14
15
*00083008-1
*A083037-10
A082281-1
*ND02904-7
A085010-1
93
91
94
98
80
2.3
2.5
2.0
3.3
2.3
3.1
2.8
2.5
2.0
3.1
1.089
1.079
1.082
1.067
1.084
13
20
18
5
58
Fair
Flat, coarse
EH, Fair
Coarse, EH
Nice, heavy net
16
17
18
19
20
*A085031-7
A085066-2
*A085165-1
A085165-2
A082260-4
97
98
94
96
80
3.3
3.5
2.0
2.8
2.3
3.5
1.3
2.6
2.6
1.0
1.078
1.072
1.076
1.080
1.070
23
28
10
28
13
Flat, ugly
Coarse
Fair
Fair
Too round
21
22
23
24
25
A085257-4
ND02955-6
ND02667-12
C0086222-3
C0086149-3
98
94
99
98
95
3.0
3.3
3.0
2.5
2.5
4.0
1.5
1.6
2.1
2.6
1.080
1.069
1.069
1.069
1.070
13
10
13
0
0
Misshapen
Small
EH
Misshapen
Big
26
27
28
29
30
*CO086149-4
*CO086107-1
C0086106-1
C0086058-1
*C0086042-2
87
98
95
98
97
2.5
2.0
2.5
3.0
3.3
2.8
1.5
2.0
2.0
3.0
1.078
1.073
1.076
1.073
1.072
35
0
0
13
8
Heavy net
Pretty
31
32
33
34
35
A086107-1
A086097-6
A086078-3
A086058-4
A086057-5
98
96
100
86
98
2.8
2.8
3.0
1.8
2.3
3.5
3.3
3.3
2.4
1.6
1.081
1.084
1.083
1.070
1.073
0
33
48
3
3
Ugly
Coarse
EH, ugly
EH
Coarse
36
37
38
39
40
A086049-1
A086034-1
A086030-3
*A086026-1
*A086022-2
93
86
100
98
99
1.8
1.5
3.3
2.3
3.3
4.0
1.5
2.4
2.5
4.0
1.084
1.072
1.086
1.090
1.093
10
15
13
Fair
EH
Poor
Rough
Crooked
41
42
43
44
45
46
*A086011-3
*A085018-6
A084508-11
A083202-2
A083026-202
*A083221-204
95
98
97
98
99
99
2.5
2.8
2.3
2.0
2.3
2.8
3.0
2.1
3.0
2.8
2.4
2.1
1.084
1.084
1.080
1.079
1.078
1.072
38
3
10
3
45
8
Average
CV (%)
LSD (.05)
95
--
2.6
2.5
1.078
0.3
0.004
14
Skinned, ugly
Flat
8
3
Coarse, skinned
Poor
Fair
Small
Fair
1/ Vigor rating: (1 - small, weak; 5 - large robust)
2/ Maturity rating: (1 - dead; 5 - green, lush)
3/ H.H.: Hollow heart - percent in 10 largest tubers/sample
4/ Comments: EH - elephant hide; GC - growth cracks; IPS - internal purple spots;
YF - yellow flesh.
* Advanced to the Statewide Trial for 1992
50
Table 4. Tuber yield by grade for entries in the Statewide Trial, Klamath
Experiment Station, OR. 1991.
Entry
No.
Selection
Yield U.S. No. is 4-12 oz >12 oz Total Rank
cwt/A
Bs
%
Yield
2s Total Rank
cwt/A ----
1
2
3
4
5
Russet Burbank
Lemhi
Norgold
Norkotah
Norchip
263
251
264
208
266
19
30
9
20
16
282
281
273
228
282
33
35
38
42
34
73
82
78
84
77
39
25
67
30
45
33
17
5
4
15
382
340
347
270
363
30
38
36
43
33
6
7
8
9
10
*A74212-1E
*Century Russet
*0008014-1
A082283-1
*A082611-7
320
290
244
289
252
122
214
34
58
38
442
504
278
347
290
4
1
36
18
31
87
88
79
65
75
25
15
21
30
45
13
13
13
94
29
503
568
350
532
385
5
1
35
3
28
11
12
13
14
15
*00083008-1
*A083037-10
A082281-1
*N002904-7
A085010-1
245
270
289
263
229
105
146
109
66
111
350
416
398
329
340
15
5
8
22
19
82
82
88
86
83
29
18
21
30
14
20
35
16
16
23
422
503
448
382
408
16
6
10
31
20
16
17
18
19
20
*A085031-7
A085066-2
*A085165-1
A085165-2
A082260-4
343
274
289
291
169
108
83
163
66
5
451
357
452
357
174
3
13
2
14
45
79
89
90
84
77
32
18
17
32
41
44
5
9
13
2
567
398
498
421
224
2
23
7
17
46
21
22
23
24
25
A085257-4
ND02955-6
N002667-12
00086222-3
00086149-3
235
145
315
256
308
86
2
15
36
56
321
147
330
292
364
25
46
20
29
11
72
61
81
80
84
16
80
59
55
33
56
2
10
6
9
442
238
405
361
431
12
45
21
34
15
26
27
28
29
30
*00086149-4
*00086107-1
00086106-1
00086058-1
*00086042-2
275
267
305
290
369
100
22
25
16
46
375
289
330
306
415
10
32
21
28
6
86
84
83
78
82
29
43
43
46
43
12
2
2
18
15
434
341
394
392
505
14
37
24
25
4
31
32
33
34
35
A086107-1
A086097-6
A086078-3
A086058-4
A086057-5
292
248
303
212
200
58
113
26
94
72
350
361
329
306
272
16
12
23
27
39
74
88
81
83
88
18
18
39
15
6
59
14
14
17
10
472
410
402
368
308
8
19
22
32
41
36
37
38
39
40
A086049-1
A086034-1
A086030-3
*A086026-1
*A086022-2
313
178
283
214
301
97
40
36
56
49
710
218
319
270
350
7
44
26
40
17
92
85
83
82
74
11
14
44
19
11
9
9
4
26
69
441
256
383
327
472
13
44
29
40
9
41
42
43
44
45
46
*A086011-3
*A085018-6
A084508-11
A083202-2
A083026-202
*A083221-204
308
227
249
291
281
204
80
12
26
36
10
17
388
239
275
327
291
221
9
41
37
24
30
43
86
61
81
78
74
78
20
89
27
29
83
37
14
30
20
25
7
9
447
389
338
417
391
283
11
27
39
18
26
42
265
19
70
60
53
45
325
20
89
81
---
33
32
15
19
63
17
399
17
96
Average
CV (%)
LSD (.05)
* Retained for further evaluation.
51
Table 5. Performance of entries in the Western Regional Trial,
Klamath Experiment Station, OR. 1991.
Selection
Stand
6/11
6/24
Vine
vigor
rating
Vine
maturity
rating
Specific
gravity
H.H.
-%-
Russet Burbank
Lemhi
Norkotah
Shepody
Red LaSoda
89
50
93
54
78
98
99
98
93
99
3.0
3.3
4.3
2.3
4.0
2.3
2.3
1.1
2.3
1.1
1.084
1.083
1.072
1.075
1.066
5
75
23
0
23
Century Russet
AC7869-17
AC81198-11
A082283-1
A082611-7
49
54
16
52
70
100
98
94
93
99
2.8
3.0
2.0
2.5
3.3
4.5
2.5
2.5
3.0
2.4
1.079
1.082
1.082
1.084
1.088
3
8
3
25
10
*C082142-4
*00083008-1
ND 671-4 RUSS
ND 1538-1 RUSS
ND 2224-5R
8
67
37
64
44
95
95
99
98
89
2.0
2.8
2.5
3.3
2.3
2.5
2.5
2.0
1.6
1.0
1.081
1.089
1.066
1.070
1.066
15
15
23
5
0
*ATX6-84378-1 RUSS
*A81473-2
*A82119-3
*A083037-10
*A82705-1R
C081082-1
53
16
62
72
16
31
94
96
95
97
95
69
3.5
2.0
3.3
3.0
2.3
1.5
2.3
4.0
3.5
3.0
2.8
1.1
1.076
1.086
1.083
1.080
1.069
1.072
63
0
45
23
0
0
51
95
2.8
2.4
1.078
0.3
0.004
17
Average
CV (%)
LSD (.05)
* Retained for further testing in the Western Regional Trial.
52
Table 6. Tuber yield by grade for entries in the Western Regional Trial,
Klamath Experiment Station, OR. 1991.
Selection
Yield U.S. No. is
4-12 oz
>12 oz
Total
Bs
No. 2s
Yield
Culls
Total
307
278
242
124
291
32
62
25
8
42
339
340
267
132
333
cwt/A
62
43
94
22
65
31
4
0
35
8
35
8
2
5
7
467
395
363
194
413
Century Russet
AC7869-17
AC81198-11
A082283-1
A082611-7
288
243
261
288
256
274
60
42
77
17
562
303
303
365
273
31
50
73
45
103
24
19
28
111
11
22
9
32
25
21
639
381
436
546
398
*C082142-4
*00083008-1
ND 671-4 RUSS
ND 1538-1 RUSS
ND 2224-5R
253
259
211
225
106
123
101
3
20
0
376
360
214
245
106
25
36
96
109
112
22
14
1
15
1
21
6
12
15
7
444
416
323
384
226
*ATX6-84378-1 RUSS
*A81473-2
*A82119-3
*A083037-10
*A82705-1R
C081082-1
167
280
314
384
412
138
246
138
54
165
129
12
413
418
368
549
541
150
13
26
60
42
47
27
16
7
20
2
6
3
57
18
5
6
6
5
499
469
453
618
599
186
254
21
75
77
45
49
331
18
85
56
28
23
19
100
27
15
109
23
421
15
92
Russet Burbank
Lemhi
Norkotah
Shepody
Red LaSoda
Average
CV (%)
LSD (.05)
* Retained for further testing in the Western Regional Trial.