Klamath Experiment Station
Red-skinned and Specialty Potato Variety Development, 1997
K.A. Rykbost', R. Voss'', A. Mosley, J. Maxwell', and B. Charlton'
A
bstract
Interest in red-skinned and specialty
potato varieties has increased in recent
years. The Western Regional Potato Variety
Development Committee established a formal
evaluation for red-skinned varieties in 1994 and
for other specialty varieties in 1997. The Klamath
Experiment Station (KES) program has been
screening first generation, single-hill red-skinned
selections from Aberdeen, Idaho, North Dakota
State University. and Colorado State University
potato-breeding programs since 1988. Three
Oregon red-skinned selections were included in
the 1997 regional trial. Rapid seed increases are
planned for two of these clones in 1998. One
selection in particular. ND02686-6R, has
produced outstanding results in numerous locations and is an excellent prospect for release.
Four additional KES red-skinned selections will
be entered in the regional program in 1998. A
very attractive, russet-skinned, yellow-fleshed
selection from the Oregon statewide program will
be advanced to the regional specialty trial in
1998.
Introduction
The standard red-skinned potato varieties
currently available do not meet the preferred
quality criteria of buyers. Before 1988, northwestern variety development programs concentrated on russet types, with little emphasis on
chipping selections, and no effort to identify
superior red-skinned selections. A screening
program was initiated by the KES in 1988 to fill
this gap. Since the inception of the program, over
33,000 single-hill, red-skinned clones have been
screened in the program. One measure of success
is the promising performance of three Oregon
selections in regional trials and of the addition of
four new selections to the 1998 trial. Another is
the fact that several KES selections are being
used as parents in the Idaho and Colorado
breeding programs. Most of the clones selected
from single-hills in 1997 were from crosses with
one parent from the KES program.
The 1997 KES program included about
2,000 single-hill, red-skinned selections, twentytwo 12-hill second-year selections, 8 advanced
clones in a replicated yield trial, and 6
selections and three standard varieties in the
regional red-skinned trial. Trials at Kern County
and Tulelake, California and Corvallis, Oregon
included several advanced KES selections. A
specialty trial with nine selections was conducted
at KES for the first time. This report summarizes
progress in the evaluation of this material.
/ Superintendent/Professor and Biological Sciences Research Technician III, respectively, Klamath
Experiment Station, Klamath Falls, OR.
2 / Extension Specialist, Vegetable Crops Department, University of California, Davis. CA.
"/ Extension Specialist and Research Assistant, respectively, Department of Crop and Soil Science, Oregon
State University, Corvallis, OR.
1
Acknowledgments: The authors are grateful to programs at Aberdeen, Idaho, North Dakota State
University. and Colorado State University for providing breeding lines for evaluation and to the Oregon
Potato Commission. USDA-ARS, and USDA-CREES for partial funding.
22 Klamath Experiment Station 1997
Klamath Experiment Station
Red-skinned and Specialty Potato Variety Development, 1997
I. Single-hill Seedling Screening
Procedures
Breeding selections provided for
single-hill screening were derived from 12
Colorado crosses, 7 Idaho crosses, and 17
North Dakota crosses. The total of about
4,500 clones were prescreened to reduce the
population to about 2,000 planted. Preplant
screening was based on skin color, shape,
size, and general condition of the greenhouseproduced tuberlings. Most of the North
Dakota material was very small.
All KES red-skinned and specialtyvariety evaluations were conducted on a Poe
fine sandy loam soil site following a 1991-96
alfalfa crop. Telone II was applied at 18 gpa
in October, 1996 to control nematodes and
related diseases. All fertilizer for these trials
(1,000 lb/acre 15-15-15) was banded at
planting. Potatoes were planted with a tworow, assisted-feed planter in 32-inch rows on
May 21. Single-hills were planted at 36-inch
spacing. Seed was spaced at 8.7 inches in all
other KES variety trials. Cultural practices for
weed control, irrigation, and insect and
disease control were as described for other
variety trials (page 13). Vines in the single-hill
selections were desiccated with Diquat
applied at 1.0 pint/acre on September 2 and
September 7. Tuber families were dug with a
two-row, level-bed digger and displayed for
selection on September 23.
Results and Discussion
Tuberlings from the North Dakota
breeding program were very small, slow to
emerge, and generally produced weak plants.
Most of the North Dakota material provided to KES
was 0.25- to 0.4-inch diameter. As a result, only one
clone was selected from the North Dakota crosses
(Table 1). Much greater vigor was observed in plants
from Idaho and Colorado crosses. Most minitubers
from Colorado and Idaho were 0.5-inch diameter or
larger.
At harvest, 36 clones were selected for
further evaluation. Tubers were stored at approximately 40 °F and 90 percent relative humidity following a gradual cooling period. Clones were re-evaluated after three months in storage. Twenty-one
selections were saved for evaluation as 12-hill plots
at KES in 1998 (Table 1).
In previous years, tubers from single-hill
selections have been eye-indexed and greenhousetested for freedom from viral infections. In 1997, viral
content was greater than in earlier years, and greenhouse emergence was poor in many of the clones.
Historically, control of viral infection in the single-hill
and 12-hill material at KES has been excellent;
however, more virus infection has occurred in KES
material since the loss of Temik in 1990. At the
January 1998 meeting of the Oregon Potato Variety
Development Committee a decision was made to
move the initial screening of red-skinned selections
from KES to the Powell Butte site. This will reduce
the risk of viral infection in the Powell Butte screening
and seed- increase programs and also reduce the risk
of infecting the Powell Butte site with root-knot
nematodes, which could be introduced by infected
tubers from KES.
II. Multi-hill Observational and Advanced Redskinned Trials
Procedures
Twenty-two selections from 1996 single-hills
Klamath Experiment Station 1997 23
Klamath Experiment Station
Red-skinned and Specialty Potato Variety Development, 1997
were planted in tuber-unit 12-hill plots adjacent to
the single-hill plots on May 21. Seed was spaced
at 8.7 inches, with one space of 8.7 inches
skipped between tuber units. Cultural practices,
including vine desiccation, were as described for
single hills. All tubers from 12-hill plots were
harvested with a one-row, digger-bagger and
stored until late October, when 10 selections
were discarded. An evaluation on December 17
resulted in disposing of an additional six selections.
Eight earlier generation selections were
evaluated at KES in a completely randomized
block design experiment with four replications.
Dark Red Norland was included as the standard
variety. Potatoes were planted on May 21, vines
were desiccated with Diquat applied on September 2 and 7, and potatoes were harvested with a
one-row, digger-bagger on September 22. All
tubers were stored and graded in late October.
Cultural practices were as described for other
trials on page 13. One subsample of 6- to 10-oz
tubers from each selection was evaluated for
culinary quality in boiling and microwave tests.
Four KES advanced selections and
Modoc (a selection made by a local potato
grower), were included in variety trials conducted
in Kern County and Tulelake, California. The
Kern County trial was planted on February 14
and harvested on June 25. Potatoes were planted
on May 14 and harvested on September 22 at
Tulelake. Three of the same KES selections were
also included in a red-skinned trial conducted at
Corvallis, Oregon. Planting and harvesting dates
were May 24 and September 24, respectively.
Standard commercial cultural practices were
followed at all locations.
24 Klamath Experiment Station 1997
Results and Discussion
Six of the 12-hill selections were saved
for further evaluation (Table 2). One of these.
CO094029-1, had a deep purple skin and very
white flesh. This clone will be entered in the
regional specialty trial if it performs well in 1998.
Six to eight tubers of clones selected have been
provided for seed increase at Powell Butte. The
clones will be included in observational trials at
KES and two California sites in 1998.
Plant and tuber characteristics of the
advanced red-skinned selections were monitored
at KES (Table 3). ND04300-1R and
A092657-3R stand out as early maturing selections with good color, round shape, shallow eyes,
and the least skin damage at harvest. Early
maturity and high ratings for tuber appearance
were also noted for ND04300-1 at both California sites. No serious deficiencies were observed
for any of the selections in culinary tests at KES.
Yields were very high in the replicated
KES trial (Table 4). Several selections produced
excessive tuber size. Over 50 percent of Modoc
yield consisted of tubers over 10 oz. When tubers
over 10 oz are excluded, No. 1 yields were
highest for ND05464-3R, A092657-3R, and
ND04300-1R, respectively. All selections
produced fewer culls than Dark Red Norland.
Yields of Modoc and four KES selections
at two California sites as well as mean yields for
these clones and Dark Red Norland at KES and
the California sites are presented in Table 5.
Averaged over locations, yields were similar. The
greatest differences were in tuber size distribution.
ND04300-1R and ND05108-1R produced
smaller tubers than Dark Red Norland or the
other clones. At Corvallis, ND04300-1R
Klamath Experiment Station
Red-skinned and Specialty Potato Variety Development, 1997
achieved the highest yield of No.1 s and was
higher in yield of less than 4-oz and 4- to 6-oz
tubers than most other selections in the trial (Table
6).
Seed production at Powell Butte was an
additional source of information for decisions on
the disposition of the clones included in these
trials. ND04300- I R and A092657-3R produced high yields of attractive tubers. Lower
yields with acceptable appearance were noted for
ND04588-5R and ND04592-3R. These four
selections will be entered in the 1998 regional,
red-skinned variety trial. A092655-9R will be
evaluated for one more year in KES and California trials with four other KES selections limited to
seed increase at Powell Butte in 1997.
ND05108-1R has been discarded because of
undesirable tuber appearance in more than one
location.
III. Western Regional Red-skinned Trial
Procedures
Three standard varieties and six numbered selections were included in the 1997
western regional trials conducted at KES and
seven other sites in 1997. At KES, potatoes were
planted in 30-hill plots on May 21 and harvested
on September 22. All tubers were stored until
graded in late October. Cultural practices and
grading procedures were as described for other
trials.
Results and Discussion
Plant and tuber characteristics are presented in Table 7. All selections were superior to
the standard varieties in tuber appearance.
Growth cracks were noted as a problem for
C086142-3 at all locations. The best color was
observed in C0086107-1R, DT6063-1R, and
ND02686-6R. Skinning damage was more
serious in C086142-3 and C086218-2 than in
the other numbered selections. No serious
culinary deficiencies were observed in any clones.
Yields were generally high with most
entries producing a high percentage of tubers over
10 oz (Table 8). Sangre had the highest yield of
No. ls, but nearly 50 percent was tubers over 10
oz. Red LaSoda had a very high proportion of
culls with growth cracks and off-types. At KES
and across all locations, ND02686-6R produced
the highest yield of < 10 oz No. I s. It was higher
than all other entries in yield < 6 oz, the highest
value component of the red-skinned crop.
Performance at Corvallis was similar (Table 6).
Seed of ND02686-6R was provided for
trials at three Wisconsin locations in 1997.
ND02686-6R averaged 390 cwt/acre of No ls
< 10 oz, compared to 400 cwtlacre for Dark
Red Norland. It was rated better than Dark Red
Norland and several other entries in most appearance characteristics.
ND02686-6R, C086142-3, and
C086218-2 have been evaluated in the regional
trial for three years and will not be included in
1998. A rapid seed increase through tissue
culture and greenhouse production is planned for
ND02686-6R in 1998. Outstanding appearance,
high production of small tubers, and early maturity
make this an excellent candidate for release. A
shortage of seed will delay release for one to two
years. C0086107-1R and ND02438-6R will
continue in the regional trial in 1998: C00861071R is probably the better prospect of the two.
DT6063-1R has been grown commercially for
several years under the name of Cherry Red. It
will remain in the trial in 1998.
Klamath Experiment Station 1997 25
Klamath Experiment Station
Red-skinned and Specialty Potato Variety Development, 1997
/1/. Specialty Variety Trial
Procedures
The trial included the following yellowfleshed varieties: Yukon Gold, Yellow Finn, Red
Gold, Desiree. German Butter Ball, Granola, and
Pimpernel. A numbered selection, NDC40694R/R. which has deep red skin and flesh color
was also included. Plots were 30-hills with four
replications. Potatoes were planted on May 21
and harvested on October 7. All tubers were
stored and graded in late October. Cultural
practices and evaluation procedures were as
described for other trials. Culinary testing was
limited to a boiling test.
Results and Discussion
Yukon Gold and Red Gold were relatively early maturing (Table 9). All other selections
exhibited late maturity and very vigorous vine
growth. Desiree and Red Gold had pale skin
color and were not particularly attractive. Yukon
Gold produced good appearance but had the
lightest yellow flesh color. The skin and flesh of
NDC4069-4R/R was very dark red. The red
pigment of this selection has been of interest as a
food colorant. Yellow Finn tubers were somewhat
pear-shaped, but attractive.
As in red-skinned trials, yields were high
(Table 10). German Butter Ball produced a
significantly higher yield than all other entries.
Pimpernel, German Butter Ball, and Red Gold
produced high yields of small tubers which
command premium prices in specialty markets.
Averaged over seven locations. German Butter
Ball produced the highest yields and Yellow Finn
had the lowest yield.
Niche markets for specialty varieties are
increasing, particularly in California. This trial
26 Klamath Experiment Station 1997
demonstrated acceptable local performance of
several yellow-fleshed varieties. There are
additional specialty varieties from European
companies being promoted in North America.
Most of these are round, yellow-skinned, and
yellow-fleshed. Recently, at least one processing
company has expressed interest in a russetskinned, yellow-fleshed selection with suitable
quality for French fry production. Development of
a regional specialty trial provides a showcase to
acquaint the industry with some of the options for
niche markets.
Klamath Experiment Station
Table 1. Single-hill, red-skinned potato seedlings selected at Klamath Falls, OR, 1997.
Number
planted
Parents
Male
Family no.
Female
A094378
A094392
A095589YF
A88479-3R
Ruby Red
A89655-5DY
ND02438-7R
ND02469-1 R
ND02469-1R
00095016
C0095083
00095105
00095107
00095110
00095127
00095128
00095129
00095130
AC82706-2
C086218-2
COTX86146-2
DT6063-1R
ND1871-3R
ND02438-7
ND02438-7
ND02438-7
ND02438-7
ND02438-7
ND02438-7
C086142-3
NDTX-1068-11R
NDO2438-7
BC0981-2
C086142-3
ND03849-12
NDTX-1068-11R
ND06491
Fontenot
CT86146-2R
1/
34
84
80
1
0
90
56
62
114
186
72
172
128
106
6
1
2
1
7
1
3
7
4
2
1
1
18
1
0
36
21
(1970) 1
Total
Number selected
Winter
Fall
4
3
4
Total number of single-hill clones planted.
Table 2. Red-skinned potato clones selected from 12-hill plots at Klamath Falls, OR, 1997.
No.
Female
NDO6173-1
NDO6173-2
ND06183-1
ND06184-1
00094029-1
00094114-1
3574-5R
3574-5R
3595-17R
3630-17R
AC88482-1
TCI 389-3
Parent
Male
NorDonna
NorDonna
5084-3R
Bison
ND1871-3
ND02050-1
Klamath Experiment Station 1997 27
Klamath Experiment Station
Table 3. Plant and tuber characteristics of advanced, red-skinned potato selections grown at Klamath
Falls. OR. 1997.
Variety/
Percent stand
Vine
Vine
selection
6/13
7/1
vigor'
maturity
Color
Eyes
Shape
Skinning
Dark Red Norland
ND04300-1R
ND04588-5R
ND04592-3R
ND05108-1R
37
41
30
40
43
92
93
84
93
86
4.0
3.8
3.8
4.3
4.3
3.5
2.5
3.3
3.3
3.3
3.0
4.0
4.5
5.0
5.0
3.0
4.3
3.5
3.0
4.0
2.0
1.0
1.5
2.5
1.5
3.0
4.0
3.0
3.0
2.5
ND05464-3R
A092655-9R
A092657-3R
Modoc
32
4
83
7
95
93
91
86
4.3
4.3
5.0
3.3
3.8
2.5
2.5
3.8
4.0
4.0
4.0
4.0
4.0
3.8
4.0
5.0
1.0
2.0
1.0
3.0
3.3
3.8
4.0
3.0
Mean
35
90
4.1
3.2
4.2
3.8
l.7
3.3
1
/ Vine vigor rating: 1 is small, weak, to 5 for large, robust.
2
/ Vine maturity:
1 is early, to 5 for a late maturing plant.
3
/ Color rating:
Eyes depth:
Shape:
Skinning rating:
1 is pale to pink, to 5 for bright red.
1 is deep, to 5 for shallow.
1 is round, to 2 for oval, 3 for oblong.
1 is severe, to 5 for none.
28 Klamath Experiment Station 1997
Tuber characteristics 3
Klamath Experiment Station
Table 4. Yield, grade, tuber size distribution and specific gravity of advanced red-skinned potato selections
grown at Klamath Falls, OR. 1997.
Variety/
selection
Yield No. is
< 4 oz
4-6 oz
6-10 oz
> 10 oz
total
Yield
culls
total
Specific
gravity
cwt/A
Dark Red Norland
ND04300-1R
ND04588-5R
ND04592-3R
ND05108-1R
ND05464-3R
A092655-9R
A092657-3R
Modoc
Mean
CV (%)
LSD (P = 0.05)
23
59
26
32
60
56
109
56
59
88
217
252
202
172
231
215
131
248
267
104
512
551
532
530
484
44
7
10
21
36
556
558
542
551
520
1.074
1.073
1.067
1.074
1.075
101
85
71
42
144
139
129
55
280
156
276
164
95
76
1 65
324
620
456
640
585
4
10
2
5
624
466
642
590
1.074
1.075
1.074
1.073
55
29
23
93
24
33
217
19
60
181
29
76
546
11
85
15
47
11
561
11
89
1.073
0.1
0.004
Klamath Experiment Station 1997 29
Klamath Experiment Station
Table 5. Yield, grade, tuber size distribution, and specific gravity of advanced, red-skinned potato
selections grown at Kern County and Tulelake, CA, and the average for three locations in 1997.
Variety! Y
ield No. is Yield
selection
4 oz 4-6 oz
6-10 oz
> 10 oz
total
total
culls
Specific
gravity
cwt/A
Kern County, CA
Dark Red Norland
ND04300-1R
ND04588-5R
ND04592-3R
ND05108-1R
Modoc
10
20
21
20
21
11
59
54
60
72
108
48
251
224
261
259
213
261
85
33
63
147
19
58
405
330 '
406
498
340
378
41
29
37
41
84
8
446
359
442
539
445
386
1.073
1.071
1.073
1.074
1.078
1.069
Mean'
CV (%)
LSD (P= 0.05)
25
65
22
75
49
47
224
26
87
80
66
109
404
40
83
62
444
21
145
1.072
5
0.008
Tulelake, CA
Dark Red Norland
ND04300-1R
ND04588-5R
ND04592-3R
ND05108-1R
Modoc
22
22
30
31
37
28
118
178
179
162
180
227
99
127
140
93
128
170
45
34
8
39
5
65
284
360
357
325
349
490
77
29
13
34
75
14
362
389
371
359
424
504
1.062
1.071
1.073
1.073
1.07
1.074
Mean'
CV (%)
LSD ( = 0.05)
28
37
16
159
20
43
133
23
39
53
57
40
373
31
58
35
404
12
66
1.072
5
0.008
54
22
20
32
65
9
454
437
451
484
463
493
1.07
1.072
1.071
1.074
1.074
1.072
-
Three Location Mean
Dark Red Norland
ND04300-1R
ND04588-5R
ND04592-3R
ND05108-1R
Modoc
18
34
26
28
39
27
78
114
98
98
125
110
189
201
201
175
191
198
115
66
106
151
43
149
400
415
431
452
398
484
2
'I Mean and statistical parameters are based on all entries in these trials (18 at Tulelake and 19 at
Kern County).
2/
Mean for Klamath Falls, OR, and Tukelake and Kern County, CA.
30 Klamath Experiment Station 1997
Klamath Experiment Station
Table 6. Yield, grade, tuber size distribution, and specific gravity of potato varieties and advanced
selections grown at Corvallis, OR, 1997.
Variety/
selection
4-6 oz
Yield No. is
6-10 oz
> 10 oz
total
< 4 oz
Yield
culls
total
Specific
gravity
cwt/A
Dark Red Norland
Red La Soda
Sangre
69
38
45
210
152
174
165
214
292
444
404
512
75
41
38
79
80
97
598
526
646
1.085
1.072
1.079
C086142-3
C086218-2
00086107-1R
DT6063-1R
64
50
52
63
172
195
182
181
69
255
130
228
304
500
363
471
75
59
50
52
100
54
37
40
479
614
450
563
1.077
1.083
1.082
1.084
ND02438-6R
ND02686-6R
ND04300-1R
ND04588-5R
ND04592-3R
54
91
110
81
61
154
242
287
235
174
230
83
139
216
157
437
416
536
531
392
55
100
101
57
58
26
4
11
15
42
518
519
649
603
492
1.061
1.079
1.068
1.070
1.073
65
27
25
196
24
66
182
31
81
443
14
91
63
25
23
49
53
37
555
12
97
1.076
0.5
0.008
Mean
CV (%)
LSD (P = 0.05)
•
Klamath Experiment Station 1997 31
Klamath Experiment Station
Table 7. Plant and tuber characteristics of red-skinned potato varieties and selections in the Western
Regional Trial at Klamath Falls, OR, 1997.
Variety/
Percent stand
Vine
Vine
selection
6/13
7/1
vigor'
maturity
Color
Eyes
Shape
Skinning
Dark Red Norland
Red La Soda
Sangre
54
1
98
91
85
4.3
5.0
2.0
4.3
3.5
4.8
3.0
3.5
3.8
3.0
2.0
2.0
2.5
2.8
2.0
3.0
2.5
2.3
C086142-3
C086218-2
C0086107-1R
DT6063-1R
ND02438-6R
ND02686-6R
66
13
20
36
23
63
96
89
98
98
99
83
4.3
4.3
3.8
3.5
3.8
4.8
2.0
3.8
2.8
3.8
2.0
2.0
4.5
4.0
5.0
4.8
4.3
4.8
3.5
4.3
5.0
4.0
4.0
4.8
2.0
2.0
2.0
2.3
1.3
2.0
2.8
3.3
3.8
4.0
4.0
4.0
Mean
33
93
4.0
3.2
4.2
3.6
2.1
3.3
/ Vine vigor rating
is small, weak to 5 for large, robust.
/ Vine maturity:
3 / Color rating:
Eyes depth:
Shape:
Skinning rating:
is early, to 5 for late maturing plant.
is pale to pink, to 5 for bright red.
is deep, to 5 for shallow.
is round, 2 for oval, 3 for oblong.
is severe, to 5 for none.
1
2
32 Klamath Experiment Station 1997
Tuber characteristics 3
Klamath Experiment Station
Table 8. Yield, grade, tuber size distribution, and specific gravity of varieties and selections in the Western
Regional Trial of red-skinned potatoes at Klamath Falls, OR, 1997.
Variety/
selections
< 4 oz
Yield No. is
4-6 oz
6-10 oz
> 10 oz
total
Yield
culls
total
Specific
gravity
cwt/A
Dark Red Norland
Red LaSoda
Sangre
45
31
37
62
46
76
164
137
167
222
224
282
493
438
562
77
161
36
570
599
598
1.074
1,073
1.077
C086142-3
C086218-2
00086107-1R
DT6063-1R
ND02438-6R
ND02686-6R
49
41
49
41
52
78
64
63
71
75
69
153
162
131
159
158
146
185
119
219
168
206
238
92
395
454
447
480
505
508
50
18
12
13
7
9
445
472
459
493
512
517
1.077
1.078
1.082
1.088
1.063
1.081
Mean
CV (%)
LSD (P = 0.05)
47
32
22
75
23
25
157
14
NS
197
21
60
476
10
68
42
51
31
518
11
83
1.077
OP
0.004
Klamath Experiment Station 1997 33
Klamath Experiment Station
Table 9. Plant and tuber characteristics of specialty potatoes grown at Klamath Falls, OR, 1997.
Variety/
selection
Percent stand
Vine
Vine
Skin
Flesh
Tuber
6/13
7/1
vigorl
maturity2
color
color
shape
Desiree
German Butter Ball
Granola
Yukon Gold
51
82
0
28
98
100
76
97
4.0
5.0
2.0
3.5
4.5
4.0
5.0
2.5
pink
yellow
yellow
yellow
yellow
yellow
yellow
yellow
oblong
round
round
round
NDC4069-4R/R
Yellow Finn
Pimpernel
Red Gold
52
64
46
87
92
98
98
100
4.5
4.8
5.0
5.0
4.3
4.3
4.8
2.8
red
yellow
pink
red
red
yellow
yellow
yellow
round
round
oblong
round
Mean
51
95
4.2
4.0
NA
NA
NA
1/
Vine vigor rating: I is small, weak, to 5 for large, robust.
2/
Vine maturity rating: 1 is early, to 5 for late maturing plants.
NA: Not applicable.
Table 10. Yield, grade. tuber size distribution, and specific gravity of specialty potatoes grown at Klamath
Falls, OR, 1997.
Variety/
select
< 4 oz
4-6 oz
Yield No. is
6-10 oz
> 10 oz
total
Yield
culls
total
Specific
gravity
cwt/A
Desiree
German Butter Ball
Granola
Yukon Gold
69
149
81
41
99
214
113
53
175
289
157
176
230
99
76
196
573
751
426
465
28
11
12
6
600
762
437
471
1.084
1.086
1.070
1.089
NDC 4069-4R/R
Yellow Finn
Pimpernel
Red Gold
95
94
187
128
114
119
194
151
161
146
82
159
75
142
7
113
445
501
470
551
5
7
5
4
449
508
475
556
1.084
1.089
1.098
1.076
Mean
CV (7c)
LSD (P=0.05)
105
26
40
132
13
26
168
29
72
117
45
77
512
18
136
10
92
13
532
17
134
1.084
0.4
0.005
34 Klamath Experiment Station 1997