Potato Variety Trials 2003

Eric P. Eldredge, Clinton C. Shock, and Lamont D. Saunders
Malheur Experiment Station
Oregon State University
Ontario, OR

Introduction

Potatoes are grown under contract in Malheur County for potato processors to produce frozen products for the food service industry. There is very little production for fresh pack or open market, and very few growers have potato storage buildings on their farms. There is also no production of varieties for making potato chips. There is no potato seed production in Malheur County because high populations of aphids result in virus infection in the tubers. The varieties grown are mainly 'Shepody', 'Ranger Russet' and 'Russet Burbank'. Harvest begins in July, providing potatoes to processing plants directly from the field. Yields are limited by "early die" syndrome, causing early senescence of the vines. Early die is caused by a complex of soil pathogens, including bacteria, nematodes, and fungi, and is worse when rotations between potato crops are shorter.

Small acreages of some advanced selections or new varieties are contracted by processors each year to study the feasibility of expanding the use of the new varieties. To displace an existing processing variety, a new potato variety needs to have several outstanding characteristics. The yield should be at least as high as the yield of Russet Burbank. The tubers need to have low reducing sugars for light, uniform fry color, and high specific gravity. A new variety should be resistant to tuber defects or deformities caused by disease, water stress, or heat. It should begin tuber bulking early if it is a variety for early harvest. Or, if it is a late-harvest variety, it should be resistant to early die.

Potato variety development trials at Malheur Experiment Station in 2003 included a trial of 9 selected strains of Umatilla Russet, an 8-Hill trial of 54 long russet clones from the USDA Agricultural Research Service (ARS) potato breeding program at Aberdeen, Idaho; the Oregon Preliminary Yield Trial with 99 entries; the Oregon Statewide Trial with 28 entries; the Western Regional Early Harvest Trial with 19 entries; and the Western Regional Late Harvest Trial with 17 entries. Through these trials and active cooperation with other scientists in Idaho, Oregon, and Washington, promising new lines are bred, evaluated, and eventually released as new varieties.

Materials and Methods

The six potato variety trials were grown under sprinkler irrigation on Owyhee silt loam, where winter wheat was the previous crop. The wheat stubble was flailed and the field was irrigated and disked. A soil test taken September 9, 2002 showed 18 ppm NO3, 18 ppm P, 306 ppm K, organic matter 2.2 percent, and pH 7.6. Fall fertilizer was broadcast to apply 21 lb N/acre, 100 lb P2O5/acre, 60 lb K2O/acre, 60 lb S/acre, 30 lb Mg/acre, 4 lb Zn/acre, 2 lb Cu/acre, 1 lb Mn/acre, and 1 lb B/acre. The field was ripped, Telone II was injected at 25 gal/acre, and the field was bedded on 36-inch row spacing.

Seed of all varieties was hand cut into approximately 2-oz seed pieces and treated with Tops-MZ + Gaucho dust 1-2 weeks before planting and placed in storage at approximately 90 percent relative humidity and 45°F to suberize. On April 4, 2003, Roundup was applied at 1 qt/acre to control winter annual weeds and volunteer wheat. The Western Regional Early Harvest Trial was planted on April 10, 2003, the Preliminary Yield Trial was planted on April 17, and the other trials were planted on April 18. The 8-Hill Trial was unreplicated, the Preliminary Yield Trial had two replicates, and the Umatilla Strain, Statewide, Western Regional Early Harvest, and Western Regional Late Harvest trials each had four replicates.

Potatoes were planted in single row plots using a two-row cup planter with seed spacing 9 inches in the row, with rows 36 inches apart. Red potatoes were planted between each pair of plots to serve as markers to separate the plots at harvest. After planting, hills were formed over the rows with a Lilliston rolling cultivator. Prowl at 1 lb/acre plus Dual at 2 lb/acre was applied on May 1 and was incorporated by a total of 0.42 inch of rain May 3-5. Matrix herbicide was applied at 1.25 oz/acre on May 28 and was incorporated with a 1.5-inch sprinkler irrigation on May 29

Fungicide applications to help control early blight and prevent late blight infection started with an aerial application of Ridomil Gold and Bravo at 1.5 pint/acre on June 7, which was repeated on June 25. Bravo fungicide plus liquid sulfur was applied by aerial applicator on July 2, and again on August 8. Sulfur dust was applied by aerial applicator on July 20 at 40 lb S/acre to prevent mite infestation and powdery mildew infection.

Petiole tests were taken every 2 weeks from June 12, and fertilizer was injected into the sprinkler line during irrigation to supply the crop nutrient needs. A total of 103 lb N/acre, 50 lb P2O5/acre, 21 lb K2O/acre, 53 lb SO4/acre, 40 lb S/acre, 0.5 lb Mg/acre, 0.55 lb Mn/acre, 0.32 lb Cu/acre, 0.1 lb Fe/acre, and 0.02 lb B/acre were applied. The sprinkler system was operated 22 times, from May 29 to September 23, with scheduling based on potato evapotranspiration (ET), which was calculated based on measurements made by a U.S. Bureau of Reclamation AgriMet weather station at the Malheur Experiment Station. The soil water potential was monitored with 6 Watermark soil moisture sensors (Irrometer Co. Inc., Riverside, CA) logged every 8 hours by a Hansen AM400 (M. K. Hansen Co., East Wenatchee, WA). The AM400 unit was read frequently through the summer to predict crop water needs, with the objective to apply an irrigation just before the average soil moisture in the potato root zone at the seedpiece depth reached -60 kPa. Water applied was measured by recording the sprinkler set duration at 55 psi

Vines were flailed in the early harvest trial on August 19, and in the late harvest trials on October 2. The vines of most varieties had died by the date of the last irrigation on September 23. Western Regional Early Harvest Trial potatoes were lifted August 20 with a two-row digger that laid the tubers back onto the soil in each row. Visual evaluations included observations of desirable traits, such as a high yield of large, smooth, uniformly shaped and sized, oblong to long, attractively russetted tubers, with shallow eyes evenly distributed over the tuber length. Notes were also made of tuber defects such as growth cracks, knobs, curved or irregularly shaped tubers, pointed ends, stem-end decay, stolons that remained attached, folded bud ends, rough skin due to excessive russetting, pigmented eyes, or any other defect, and a note to keep or discard the clone based on the overall appearance of the tubers.

Tubers were placed into burlap sacks and hauled to a barn where they were kept under tarps until grading. After grading, a 20-tuber sample from each plot in the Western Regional Early Harvest Trial was evaluated for tuber quality traits for processing. Specific gravity was measured using the weight-in-air, weight-in-water method, and 10 tubers per plot were cut lengthwise and examined for internal defects. Center slices from 10 tubers were fried for 3.5 min in 375°F soybean oil. Percent light reflectance was measured on the stem and bud ends of each slice using a model 577 Photovolt Reflectance Meter (Seradyn, Inc., Indianapolis, IN), with a green tristimulus filter, calibrated to read 0 percent light reflectance on the black standard cup and 73.6 percent light reflectance on the white porcelain standard plate.

The potatoes in the Preliminary Yield Trial were dug on October 7, and the potatoes in the Statewide Trial on October 8. Western Regional Late Harvest and 8-Hill Trial tubers were dug on October 14, and the Umatilla Strain Trial tubers were dug on October 15. At each harvest, the potatoes in each plot were visually evaluated. Tubers were graded and a 20-tuber sample from each plot was placed into storage. The storage was kept near 90 percent relative humidity and the temperature was gradually reduced to 45°F. Tubers were removed from storage November 3 through 13 and evaluated for tuber quality traits, specific gravity, and fry color as described above.

Results and Discussion

At the Malheur Experiment Station in 2003, spring weather was cool and wet, followed by prolonged heat and a record high temperature on July 22 of 110°F. The extreme heat stressed the potato plants, causing reduced yields and early senescence. Dry weather prevented late blight from developing in 2003. No powdery mildew or mite problems were observed in the field.

Precipitation for May 1 through September 30 was 2.38 inches, the crop ET for the late-harvest trials totaled 30.34 inches, and the trials received 31.19 inches of irrigation plus precipitation, or 103 percent of crop ET (Fig. 1). The step increases in the irrigation plus rainfall curve show the 22 sprinkler irrigations applied during the growing season.

The trend of soil moisture during the growing season is shown in Figure 2. The data were not recorded frequently enough to show the individual irrigations, and the sensors did not always respond to an irrigation. Although the irrigation plus rainfall was in excess of the AgriMet ET prediction through the growing season, sensor data show that average root zone soil water potential became drier than -60 kPa at least three times during the hottest part of the season

Soil water potential at the seedpiece depth was allowed to become drier than -60 kPa at the end of the growing season, after the vines died on the early maturing varieties, by applying frequent sprinkler irrigations of short duration, as shown in Figure 1. This was necessary to avoid swollen lenticels and the associated potential for rotting the tubers of the early senescing varieties, while continuing to apply the ET requirement for the late maturing varieties in shallow moisture increments

Umatilla Strain Trial


This was the first year of a Umatilla Strain Trial, which was conducted at this location (MES) and also at the Hermiston Agricultural Research and Extension Center (HAREC). Umatilla Russet was released jointly by the Oregon, Idaho, and Washington Agricultural Experiment Stations and the USDA ARS in 1998, and over the years some plants had been selected in the field that appeared to be superior strains. Nine of these strains were compared to Russet Burbank and Umatilla Russet (Table 1). Four of the strains had adequate yield, produced a high percent of U.S. No. 1 tubers and had acceptable processing quality. Based on the data from MES and HAREC trials, UM407, UM418, UM432, and OURS311 were advanced to the 2004 Statewide Trial.

8-Hill Trial


Eight hills were grown of each of 54 clones selected for long, russeted tubers from the Aberdeen ARS potato breeding program, including 11 clones with the LB suffix that were bred for resistance to late blight. The 54 clones were evaluated for tuber type, yield, grade, and processing quality (Table 2). Several of the clones had high yields, produced a high percent of U.S. No. 1 tubers, and had good processing quality. The clone 'A96112-20' yielded a total of 905 cwt/acre, with 90 percent U.S. No. 1 grade tubers, specific gravity of 1.0978 g/cm3, and an average fry strip light reflectance of 49.5 percent, which was acceptable for processing, with 0 percent sugar ends. The clone 'A96783-109LB' yielded 828 cwt/acre total, with 91 percent U.S. No. 1 grade, with specific gravity 1.1092, and fry strip light reflectance of 45.3 percent. The clone 'A99123-1' yielded 751 cwt/acre total, with 97 percent U.S. No. 1 grade, with specific gravity 1.0887, fry strip light reflectance of 49.1 percent and 0 percent sugar ends. The clone 'A99133-6' produced a total yield of 769 cwt, with 99 percent U.S. No. 1, specific gravity 1.1038, average fry strip light reflectance 54.4, and 0 percent sugar ends.

Preliminary Yield Trial


In the Preliminary Yield Trial, 94 numbered clones were compared to Russet Burbank, Ranger Russet, Shepody, 'Norkotah', and 'Umatilla Russet' (Table 3). The Oregon potato variety selection committee kept 12 clones to advance to the Statewide Trial for 2004. The clones that were advanced were: 'AO9006-4', 'AO94007-1', 'AO96047-2', 'AO96073-2', 'AO96162-1', 'AO98114-2', 'AO98141-2', 'AO99002-4', 'AO99002-7', 'AO99024-8', 'AO99060-5', and 'AO99099-3', and are marked with an asterisk in the entry list. These clones yielded well across the four locations (Hermiston, Klamath Falls, and Powell Butte data are not shown in this report), had low incidence of undesirable characteristics, had high percent U.S. No. 1 grade tubers, and if selected as promising clones for processing, had high specific gravity and light fry color.

Oregon Statewide Trial


In the Oregon Statewide Trial, five clones were retained by the variety selection committee, 'AO96160-3', 'AO96141-3', 'AO96205-3’, 'AO98133-2' and 'AO98133-4' will be maintained in the Statewide Trial in 2004 (Table 4). The clone 'AO96160-3' will be recommended for advancement to the Western Regional Trials for 2004, and 'AO96141-3' will be discarded unless there is interest in it from the other states.

At this location in 2003, AO96160-3 produced total yield of 452 cwt/acre, with 89 percent U.S. No. 1, specific gravity of 1.093 g/cm3, and fry strip light reflectance of 52.2 percent, with no sugar ends. AO96141-3 produced total yield of 497 cwt/acre, with 75 percent U.S. No. 1, specific gravity of 1.091 g/cm3, and fry strip light reflectance of 51.4 percent, and 3 percent sugar ends. AO96205-3 produced total yield of 534 cwt/acre, with 83 percent U.S. No. 1, specific gravity of 1.097 g/cm3, and fry strip light reflectance of 47.9 percent with no sugar ends. AO98133-2 produced total yield of 395 cwt/acre, with 94 percent U.S. No. 1, specific gravity of 1.098, and fry strip light reflectance of 51.6 percent, with 3 percent sugar ends. AO98133-4 produced total yield of 380 cwt/acre, with 83 percent U.S. No. 1, specific gravity of 1.095, and fry strip light reflectance of 44.5 percent, with 8 percent sugar ends. Russet Burbank had 63 percent sugar ends, far more than any other variety.

Western Regional Early Harvest Trial


In the Western Regional Early Harvest Trial, 'A91814-5' with 641 cwt/acre total yield, 'A92294-6' with 608 cwt/acre total yield, Shepody with 603 cwt/acre, and Russet Burbank with 602 cwt/acre, were among the highest in total yields (Table 5). All of those clones except Russet Burbank had acceptable specific gravity and fry color. In production of marketable tubers (the total of U.S. No.1 plus U.S. No. 2 grades), Shepody with 574 cwt/acre, and Russet Burbank with 522 cwt/acre, were among the highest.

Western Regional Late Harvest Trial


In the Western Regional Late Harvest Trial, among the highest for total yield were, ‘A91814-5’ with 719 cwt/acre, ‘A9305-10’ with 714 cwt/acre, ‘A92294-6’ with 713 cwt/acre, Ranger Russet with 629 cwt/acre, ‘A93157-6LS’ with 627 cwt/acre, and Russet Burbank with 570 cwt/acre (Table 6). Among the highest for marketable yield, A9305-10 yielded 678 cwt/acre marketable yield, Ranger Russet produced 610 cwt/acre marketable yield, and A91814-5 yielded 576 cwt/acre marketable yield. Russet Burbank produced 279 cwt/acre U.S. No. 2 tubers, and A92294-6 produced 217 cwt/acre U.S. No. 2 tubers, which were significantly more than other clones in this trial The clone A91814-5 produced 143 cwt/acre undersized tubers under 4 oz, significantly more than the other clones.


Figure 1. Evapotranspiration (ET) and sprinkler irrigation applied (plus rain) to potato variety trials, Malheur Experiment Station, Oregon State University, Ontario, OR, 2003.



Figure 2. Soil moisture data for sprinkler-irrigated potato variety trials, Malheur Experiment Station, Oregon State University, Ontario, OR, 2003.

Table 1. Umatilla Strain Trial: yield, grade, and processing quality of Umatilla Russet strains grown at the Malheur Experiment Station, Oregon State University, Ontario, OR, 2003.

 

 

U.S. No. 1

 

 

 

 

 

 

 

Average

Percent

Clone or Strain

Total

yield

Percent

No. 1

Total

>12

oz

4-6

oz

6-12

oz

U.S.No. 2

Market-

able

<4 oz

Rot

Length/

width

Specific

gravity

fry color, light

reflectance

sugar

ends

 

cwt/acre

%

oz

ratio

g cm-3

%

%

Russet Burbank

640.9

55.6

355.3

83.1

200.0

72.2

214.0

569.2

64.1

7.6

2.31

1.069

35.24

45.00

Umatilla Russet

660.1

72.1

474.4

175.8

231.1

67.5

141.3

615.7

40.8

3.6

1.95

1.082

44.66

0.00

*UM407

627.7

75.6

468.2

184.9

224.3

59.0

115.0

583.2

41.6

2.9

1.96

1.085

45.53

0.00

*UM418

590.2

81.8

480.6

159.5

248.2

72.9

67.8

548.4

41.1

0.7

1.88

1.086

47.20

0.00

*UM432

533.0

78.6

421.1

139.5

234.6

47.1

75.1

496.2

29.8

7.0

1.98

1.090

46.37

0.00

UM433

644.3

70.8

459.8

170.6

216.5

72.6

144.2

603.9

40.3

0.0

2.06

1.089

45.86

2.50

UM436

618.9

77.7

478.0

140.8

275.5

61.7

100.8

578.8

39.3

0.8

1.86

1.085

45.25

0.00

UM446

626.0

65.0

407.8

135.9

200.7

71.2

173.9

581.6

43.8

0.6

1.96

1.084

45.05

2.50

OURS307

633.0

63.1

400.5

151.7

192.4

56.4

192.6

593.2

39.3

0.5

2.05

1.090

44.49

5.00

*OURS311

632.3

79.5

502.8

159.9

267.6

75.2

89.9

592.7

37.8

1.8

1.89

1.084

48.17

0.00

OURS313

643.5

59.6

382.7

112.6

196.9

73.2

187.7

570.3

70.3

2.9

1.89

1.089

45.99

7.50

mean

622.7

70.9

439.2

146.7

226.2

66.3

136.6

575.8

44.4

2.6

1.98

1.085

44.89

5.68

LSD (0.05)

NS

7.5

NS

NS

53.3

NS

53.0

NS

15.5

NS

0.06

0.005

2.94

10.12

*Advanced to the 2004 Statewide Trial, based on the data from Malheur Experiment Station and Hermiston Agriculture Research and Extension Center.

Table 2. Yield, grade, and processing quality of 54 early selections in an unreplicated 8-Hill Trial, Malheur Experiment Station, Oregon State University, Ontario, OR, 2003.

 

 

U.S. No. 1

 

 

 

 

 

 

Average

 

 

Variety

Total

yield

Percent

No. 1

Total

>12

oz

4-12

oz

U.S.

No. 2

Marketable

<4 oz

Cull

Length/

width

Specific

gravity

fry color, light

reflectance

Sugar

ends

 

cwt/acre

%

-----------------------------cwt/acre-------------------------------

ratio

g cm-3

%

%

A95061-67LB

715

85

607

78

353

177

617

10

97

1.62

1.077

44.2

0

A95061-93LB

709

89

630

454

123

53

693

63

16

1.86

1.095

44.8

0

A95061-94LB

869

92

803

234

422

147

815

12

54

1.75

1.105

47.5

0

A96002-38

560

91

509

315

165

29

521

12

40

1.79

1.102

54.8

0

A96002-55

706

85

598

308

239

52

675

77

31

1.96

1.076

44.5

0

A96005-31

960

69

660

260

307

94

917

256

44

1.78

1.091

49.3

0

A96108-16

807

85

685

164

405

116

685

0

122

1.64

1.087

43.4

10

A96108-27

599

80

479

79

374

27

496

17

103

1.88

1.085

39.9

20

A96111-12

779

68

527

49

344

133

665

137

114

1.59

1.102

41.9

10

A96112-20

905

90

816

272

503

41

854

38

31

2.04

1.098

49.5

0

A96783-109LB

828

91

754

212

470

73

754

0

74

1.57

1.109

45.3

0

A96783-114LB

706

76

535

308

189

39

672

137

33

1.71

1.095

47.2

10

A97044-107LB

930

81

757

120

399

238

838

80

92

1.55

1.087

35.6

10

A97044-112LB

762

91

693

313

285

95

707

14

55

1.50

1.103

46.2

0

A97110-27

623

97

602

362

211

29

602

0

21

2.50

1.068

34.1

60

A97110-29

466

86

399

105

218

76

441

42

25

1.88

1.094

41.7

0

A97130-22

805

82

658

140

455

64

762

104

43

2.04

1.08

49.9

10

A97130-25

630

87

550

258

239

53

558

8

62

2.08

1.080

51.3

0

A97130-28

608

89

541

60

410

70

581

41

26

2.00

1.086

51.1

0

A97179-29

608

90

548

211

297

39

582

34

26

1.71

1.090

51.9

0

A97198-20

607

81

493

62

297

135

567

74

39

2.33

1.082

46.8

0

A99001-7

529

88

468

165

228

74

468

0

62

1.80

1.086

41.4

10

A99006-3

655

87

568

81

386

101

576

8

79

1.62

1.0947

51.5

0

A99007-12

554

68

378

254

93

31

524

146

30

2.25

1.096

54.6

0

A99007-13

724

78

564

447

96

21

673

109

17

2.50

1.094

47.8

0

A99007-5

734

74

544

326

171

47

643

99

91

1.79

1.071

40.9

0

A99008-6

677

70

474

325

116

33

597

123

79

2.00

1.081

39.4

20

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

U.S. No. 1

 

 

 

 

 

 

Average

 

 

Variety

Total

yield

Percent

No. 1

Total

>12

oz

4-12

oz

U.S.

No. 2

Marketable

<4

oz

Cull

Length/

width

Specific

gravity

fry color, light

reflectance

Sugar

ends

 

cwt/acre

%

-----------------------------cwt/acre-------------------------------

ratio

g cm-3

%

%

A99015-1

644

96

618

197

355

67

618

0

26

2.29

1.080

48.5

0

A99017-1

555

84

467

52

394

21

507

39

48

1.62

1.079

41.7

0

A99020-3

796

83

664

415

226

23

773

109

23

1.78

1.080

34.2

60

A99039-10

627

94

588

454

97

36

588

0

39

1.74

1.088

47.0

0

A99041-18

817

80

653

218

338

98

750

97

36

1.81

1.092

49.0

0

A99041-7

600

77

463

153

253

57

548

85

52

1.71

1.083

44.8

0

A99043-1

672

94

629

262

255

112

635

6

37

1.46

1.092

49.7

0

A99048-2

628

90

566

171

309

86

577

11

51

1.88

1.086

44.7

30

A99048-8

325

88

287

87

177

23

308

21

17

1.77

1.097

47.7

0

A99051-2

605

66

398

27

216

155

520

122

85

1.96

1.094

47.9

10

A99052-14

652

85

556

164

274

118

563

8

89

1.62

1.085

38.5

10

A99052-2

649

77

500

169

276

55

612

112

37

1.65

1.090

42.4

30

A99054-1

1082

93

1005

750

216

39

1060

55

23

1.81

1.085

46.8

10

A99054-8

563

77

434

160

239

35

497

62

66

1.85

1.068

35.0

70

A99068-9

925

90

829

297

416

116

894

66

31

1.75

1.091

44.5

0

A99073-1

851

82

698

555

136

8

836

137

15

1.48

1.083

47.9

0

A99080-3

964

83

803

619

153

31

936

133

28

1.89

1.094

47.4

0

A99123-1

751

97

727

358

309

60

727

0

24

1.69

1.089

49.1

0

A99133-6

769

99

759

454

283

22

759

0

10

1.64

1.104

54.4

0

A99394-55LB

611

84

516

102

308

106

535

19

76

1.48

1.101

48.3

0

A99394-58LB

1010

74

751

242

345

165

925

174

85

1.59

1.090

50.0

0

A99394-61LB

480

82

392

33

287

71

436

44

45

2.04

1.085

44.1

10

A99396-53LB

740

93

690

265

302

123

708

18

32

1.37

1.093

50.5

0

A99396-56LB

656

63

415

225

113

77

623

208

33

1.79

1.088

49.9

0

A99439-3

670

78

521

56

288

177

521

0

149

1.63

1.077

45.8

0

A99453-2

573

80

459

162

244

53

513

54

60

1.77

1.084

44.2

0

COA99163-7

687

75

517

266

165

86

647

130

41

1.88

1.082

49.3

0

Mean

703

84

588

238

273

76

650

62

51

1.8

1.089

45.9

7

Table 3. Preliminary Yield Trial: yield, grade, and processing quality of potato varieties grown at the Malheur Experiment Station, Oregon State University, Ontario, OR, 2003.

 

 

U.S. No. 1

 

 

 

 

 

 

Average

 

 

Variety

Total

yield

Percent

No. 1

Total

>12

oz

6-12

oz

4-6

oz

U.S.

 No. 2

Marketable

<4

oz

Cull

Length/

width

Specific

gravity

fry color, light

reflectance

Sugar

ends

 

cwt/acre

%

---------------------------------cwt/acre--------------------------------

ratio

g cm-3

%

%

R. Burbank

422

55

228

8

130

91

135

363

54

0

2.3

1.063

40.5

20

Ranger

501

72

361

98

199

64

95

456

43

0

2.1

1.087

42.2

10

Shepody

466

69

328

116

153

59

119

447

18

0

1.8

1.084

51.6

0

Norkotah

370

88

325

26

221

77

1

326

44

0

1.8

1.070

35.4

0

Umatilla

460

80

367

44

218

106

34

401

59

0

2.0

1.083

47.2

0

AO94006-3

414

79

332

98

191

43

57

389

25

0

2.2

1.079

51.4

0

*AO94006-4

462

88

409

100

249

60

24

433

29

0

2.0

1.080

47.4

0

*AO94007-1

477

87

415

34

272

109

6

421

55

0

2.0

1.085

56.7

0

AO94020-1

446

82

368

24

243

101

17

385

61

0

2.0

1.070

42.6

5

AO94030-1

404

56

227

0

69

159

49

276

125

0

2.0

1.070

44.8

5

AO94032-2

433

86

373

38

219

117

15

388

45

0

1.3

1.081

55.5

0

AO94032-4

469

74

353

93

172

87

34

386

83

0

1.6

1.083

53.6

0

AO94047-1

316

73

232

0

131

101

12

244

72

0

2.0

1.083

50.9

0

AO94047-2

484

61

292

35

139

118

46

337

147

0

1.9

1.098

49.1

5

AO94047-3

480

72

344

34

198

113

51

396

85

0

2.3

1.077

50.0

0

AO94047-4

390

79

309

56

187

66

37

346

44

0

1.8

1.088

48.0

0

AO94048-1

275

70

198

9

114

75

6

204

70

0

1.8

1.088

54.2

0

AO95101-2

491

85

422

37

257

128

0

422

66

0

1.6

1.084

48.2

10

AO95101-3

396

54

214

36

104

74

147

360

34

0

2.3

1.084

53.6

0

AO95102-4

353

63

222

13

73

136

11

232

121

0

1.9

1.077

53.8

0

AO95102-6

301

79

241

55

139

46

24

265

37

0

1.5

1.086

49.9

5

AO95109-1

343

73

254

53

140

62

55

309

35

0

1.9

1.080

47.8

5

AO95154-4

568

79

452

154

228

70

68

520

48

0

2.4

1.084

47.3

0

AO95179-2

479

89

429

84

270

75

29

458

21

0

1.8

1.073

54.7

0

AO95179-3

478

68

328

61

205

62

106

434

44

0

1.7

1.066

46.2

0

AO95185-2

379

83

313

39

173

102

11

324

55

0

1.7

1.074

54.0

0

AO95188-2

437

82

356

33

210

113

4

360

77

0

1.5

1.074

52.4

0

AO95189-1

591

73

444

88

232

124

34

478

113

0

1.6

1.086

51.3

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

 

U.S. No. 1

 

 

 

 

 

 

Average

 

 

Variety

Total

yield

Percent

No. 1

Total

>12

oz

6-12 oz

4-6

oz

U.S.

 No. 2

Marketable

<4

oz

Cull

Length/

width

Specific

gravity

fry color, light

reflectance

Sugar

ends

 

cwt/acre

%

-------------------------------cwt/acre-----------------------------

ratio

g cm-3

%

%

AO95191-1

542

84

457

150

237

69

45

502

40

0

1.7

1.084

40.4

20

*AO96047-2

446

92

411

32

253

126

2

414

33

0

1.6

1.097

51.7

0

AO96049-1

505

93

468

120

276

72

21

489

16

0

1.8

1.093

47.8

0

AO96049-2

494

76

378

182

154

42

61

438

41

11

2.0

1.063

39.2

30

AO96073-1

477

55

274

18

134

122

106

380

82

0

2.3

1.077

41.3

20

*AO96073-2

388

66

265

20

131

114

6

271

117

0

1.8

1.079

42.3

10

AO96073-5

494

90

448

173

215

59

10

457

37

0

1.7

1.089

42.3

20

AO96075-1

395

80

315

30

172

113

3

318

77

0

1.6

1.083

46.8

0

AO96081-2

421

62

261

20

117

124

8

269

152

0

1.7

1.080

42.9

10

AO96084-3

496

90

445

38

290

117

0

445

51

0

1.6

1.087

52.8

0

AO96084-4

480

62

294

155

125

13

166

460

20

0

1.7

1.095

50.8

0

AO96109-1

481

81

395

16

235

143

5

399

81

0

1.8

1.090

47.4

0

*AO96162-1

464

61

281

9

82

190

30

311

153

0

2.0

1.096

57.3

0

AO96162-2

287

66

191

4

109

78

1

192

95

0

1.9

1.077

54.5

0

AO96168-3

499

73

365

23

229

112

39

404

95

0

2.0

1.072

39.0

0

AO96277-3

469

62

290

29

164

97

125

415

54

0

2.0

1.085

49.1

0

AO96279-2

513

63

324

28

166

130

70

393

119

0

1.6

1.084

48.5

0

AO97256-4

464

70

346

154

122

71

64

410

54

0

1.6

1.085

46.1

5

AO97286-5

552

83

457

127

231

99

45

502

50

0

1.6

1.092

52.6

0

AO97296-1

563

95

535

235

260

40

0

535

24

0

1.5

1.085

39.8

10

AO97297-1

292

60

177

4

58

115

11

188

104

0

1.7

1.078

46.2

0

AO97299-2

286

89

255

69

147

39

2

257

29

0

1.8

1.076

52.2

0

AO97308-2

492

85

419

192

179

47

34

453

39

0

1.6

1.092

50.7

0

AO97310-3

655

70

464

65

268

132

80

545

111

0

1.6

1.069

40.4

40

AO97315-5

325

65

214

4

102

108

12

225

99

0

1.8

1.083

48.7

0

AO97315-6

485

81

392

55

242

94

16

408

77

0

1.7

1.097

49.2

0

AO97316-1

435

87

380

16

266

97

3

383

52

0

1.7

1.077

47.4

0

AO97373-4

365

81

298

53

183

62

22

320

42

0

1.8

1.085

46.3

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

 

U.S. No. 1

 

 

 

 

 

 

Average

 

 

Variety

Total

yield

Percent

No. 1

Total

>12

oz

6-12 oz

4-6

oz

U.S.

 No. 2

Marketable

<4

oz

Cull

Length/

width

Specific

gravity

fry color, light

reflectance

Sugar

ends

 

cwt/acre

%

---------------------------------cwt/acre--------------------------------

ratio

g cm-3

%

%

AO97375-2

383

87

335

29

192

114

3

338

45

0

1.7

1.080

53.4

0

AO98076-2

391

83

327

108

161

58

28

355

36

0

2.2

1.090

49.4

0

AO98082-1

501

89

442

184

210

48

41

483

17

0

1.8

1.080

45.3

0

AO98082-3

604

94

569

256

260

54

6

575

29

0

1.7

1.080

45

10

AO98082-4

377

85

321

46

214

61

20

340

37

0

1.8

1.073

44.3

0

AO98083-2

563

69

393

44

205

145

29

423

132

0

1.8

1.079

51.5

0

AO98114-1

397

83

330

48

194

89

5

336

61

0

1.8

1.104

50.0

0

AO98114-2

377

85

321

87

170

64

18

339

39

0

2.1

1.086

48.9

0

*AO98114-6

508

78

393

34

253

106

27

420

88

0

1.9

1.086

43.2

5

AO98114-8

419

42

196

4

71

121

15

211

208

0

1.5

1.089

46.5

0

AO98131-1

347

87

306

89

136

80

0

306

41

0

1.4

1.086

52.0

0

*AO98141-2

412

75

309

9

172

128

6

315

97

0

1.8

1.082

52.3

0

AO98147-1

342

67

230

30

107

93

27

257

85

0

2.0

1.094

52.9

0

AO98164-1

393

61

251

8

123

119

3

253

140

0

1.6

1.070

48.3

0

AO98216-1

487

92

449

212

205

31

19

468

19

0

2.1

1.077

38.0

45

AO98217-1

486

84

407

103

202

101

24

431

56

0

1.9

1.095

45.6

0

AO98218-1

362

88

318

77

185

57

12

330

32

0

1.5

1.077

54.0

0

AO98231-3

292

70

204

8

94

102

7

211

81

0

1.8

1.083

52.1

0

*AO99002-4

387

94

365

73

243

49

2

367

20

0

1.8

1.075

52.1

0

AO99002-5

310

79

244

63

126

55

27

271

39

0

1.9

1.074

43.5

0

AO99002-6

263

83

217

15

147

55

8

225

37

0

1.7

1.075

53.6

0

*AO99002-7

448

93

417

210

186

22

6

423

24

0

2.0

1.082

50.6

0

AO99002-8

339

69

236

57

123

56

60

296

44

0

2.2

1.082

47.3

0

AO99003-1

585

65

381

28

181

172

62

443

142

0

2.2

1.079

43.0

5

AO99004-6

448

85

386

83

246

57

28

414

34

0

1.9

1.082

51.7

0

AO99004-7

205

54

114

4

53

56

13

127

79

0

1.9

1.069

42.6

10

AO99012-4

414

88

375

89

203

84

0

375

38

0

1.9

1.087

47.1

0

AO99024-2

397

77

308

15

206

87

39

347

50

0

2.0

1.085

50.9

5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

 

U.S. No. 1

 

 

 

 

 

 

Average

 

 

Variety

Total

yield

Percent

No. 1

Total

>12

oz

6-12

oz

4-6

oz

U.S.

 No. 2

Marketable

<4

oz

Cull

Length/

width

Specific

gravity

fry color, light

reflectance

Sugar

ends

 

cwt/acre

%

---------------------------------cwt/acre--------------------------------

ratio

g cm-3

%

%

AO99024-3

326

81

263

20

177

66

17

279

47

0

1.8

1.068

38.4

15

*AO99024-8

484

80

394

25

237

132

2

395

89

0

1.5

1.103

57.0

0

AO99029-4

416

87

362

56

208

98

11

373

42

0

1.9

1.089

50.1

0

AO99040-1

641

89

570

125

338

107

33

604

37

0

1.6

1.094

47.6

5

AO99041-1

342

71

245

0

138

107

20

264

77

0

1.9

1.082

39.8

55

AO99041-2

438

54

241

4

125

112

50

291

147

0

1.8

1.071

44.5

5

AO99042-1

511

85

428

73

264

91

55

483

28

0

1.8

1.087

51.3

0

AO99042-4

339

93

316

45

211

60

0

316

23

0

1.6

1.077

48.9

0

*AO99060-5

536

92

501

277

202

22

24

525

11

0

2.0

1.078

46.7

0

AO99060-6

368

73

269

9

129

132

14

283

85

0

1.5

1.072

50.9

0

AO99064-3

436

90

395

37

278

81

15

410

26

0

2.2

1.076

50.4

0

AO99092-3

382

71

270

118

105

47

50

320

62

0

2.0

1.080

49.2

5

AO99099-1

545

78

439

169

223

47

35

474

71

0

1.8

1.083

46.0

10

*AO99099-3

337

69

255

35

145

75

15

271

66

0

1.6

1.079

49.8

0

AO96180-2

358

78

281

0

142

139

0

281

77

0

1.5

1.079

47.8

5

*Advanced to 2004 Statewide Trial based on the results from four locations.Table 4. Oregon Statewide Trial: yield, grade, and processing quality of potato varieties grown at the Malheur Experiment Station, Oregon State University, Ontario, OR, 2003.

 

 

U.S. No. 1

 

 

 

 

 

 

 

Average

 

 

Variety

Total

yield

Percent

No. 1

Total

>12

oz

6-12

oz

4-6

oz

U.S.

No. 2

Marketable

<4 oz

Cull

Length/

width

Specific

gravity

fry color, light

reflectance

Sugar

ends

 

cwt/acre

%

------------------------------------cwt/acre-----------------------------------

ratio

g cm-3

%

%

Russet Burbank

445

69

307

26

206

76

85

392

45

0

2.3

1.067

33.0

63

Ranger

518

82

424

120

241

62

60

484

32

2

2.1

1.095

41.7

13

Shepody

459

83

381

178

173

31

55

436

22

0

1.7

1.083

46.2

3

Norkotah

390

84

328

37

207

84

9

337

52

0

2.0

1.068

32.8

8

Umatilla

456

78

350

71

197

82

48

398

58

0

1.9

1.086

45.9

0

AO96160-3

452

89

400

29

266

106

4

404

48

0

1.9

1.093

52.2

0

AO96164-1

450

90

403

88

255

60

20

422

26

1

2.0

1.088

49.5

0

AO97178-1

488

85

415

64

276

76

34

450

39

0

1.9

1.097

40.0

13

AO97133-2

375

84

317

31

185

101

11

328

47

0

1.7

1.077

46.0

0

AO97143-1

512

77

395

38

199

159

26

421

91

0

1.9

1.090

45.3

3

AO97175-13

471

63

297

50

182

65

119

415

55

0

2.0

1.087

42.9

0

AO95250-4

377

88

330

66

203

62

16

346

31

0

2.0

1.089

54.4

0

AO95250-5

491

90

443

126

254

64

19

463

29

0

2.0

1.094

57.1

0

AO96128-10

470

70

332

16

203

113

63

395

75

0

2.1

1.093

48.8

3

AO96141-3

497

75

368

56

217

95

77

445

52

0

2.1

1.091

51.4

3

AO96148-1

523

87

452

165

231

56

34

486

34

0

2.0

1.087

45.2

18

AO96201-1

499

74

379

63

205

111

39

418

80

0

2.0

1.092

47.0

3

AO96205-3

534

83

443

104

275

64

51

494

37

1

2.0

1.097

47.9

0

AO96212-3

523

77

408

96

218

94

65

473

50

0

2.1

1.089

42.1

13

AO96212-6

419

80

335

46

210

79

42

377

41

0

2.1

1.091

47.7

5

AO96213-3

487

73

362

15

213

134

33

394

93

0

1.8

1.085

47.3

8

AO96240-5

575

69

398

122

234

43

151

549

25

0

2.2

1.084

47.2

3

AO96241-3

580

81

472

50

297

124

42

514

67

0

1.8

1.074

49.3

0

AO96249-16

481

92

441

212

198

31

27

468

13

0

2.0

1.091

45.5

3

AO96261-2

582

89

523

246

230

47

33

555

25

0

1.9

1.090

42.6

10

AO98130-1

381

88

336

65

201

71

10

346

33

2

1.9

1.088

48.4

0

AO98133-2

395

94

370

252

101

17

18

388

7

0

1.9

1.098

51.6

3

AO98133-4

380

83

317

55

189

73

8

324

55

0

1.8

1.095

44.5

8

Mean

472

81

383

89

217

78

43

426

45

0

2.0

1.088

46.2

6

(LSD 0.05)

91

10

95

64

72

29

42

102

26

NS*

0.1

0.005

3.6

13

*NS = Not significant.

Table 5. Western Regional Early Harvest Trial: yield, grade, and processing quality of potato varieties grown at the Malheur Experiment Station, Oregon State University, Ontario, OR, 2003.


 

 

U.S. No. 1

 

 

 

 

 

 

Average

 

 

Variety

Total

yield

Percent

No. 1

Total

No. 1

>12

oz

6-12 oz

4-6

oz

US No. 2

Marketable

<4

oz

Cull

Length/

width

Specific

gravity

fry color, light

reflectance

Sugar

ends

 

cwt/acre

%

---------------------------------cwt/acre----------------------------------

ratio

g cm-3

%

%

Russet Burbank

602

63

378

35

218

125

144

522

72

6

2.20

1.077

45.18

0.00

Shepody

603

80

483

250

183

51

91

574

17

12

1.83

1.085

55.78

0.00

Ranger Russet

499

65

324

117

162

45

98

422

26

50

2.00

1.096

49.28

0.00

Russet Norkotah

522

86

447

58

283

105

19

465

48

7

1.95

1.074

47.68

0.00

A91186-2

381

77

294

33

172

89

31

325

27

26

2.33

1.083

54.30

0.00

A91814-5

641

72

462

22

205

235

21

483

149

6

1.33

1.094

53.83

0.00

A92030-5

458

86

393

186

168

39

17

410

25

22

1.80

1.092

53.33

0.00

A92294-6

608

76

462

26

253

183

42

503

70

33

2.08

1.092

56.03

0.00

A9304-3

510

81

414