Potato Variety Trials at Ontario

Eric P. Eldredge and Clinton C. Shock

Malheur Experiment Station

Oregon State University

Ontario, Oregon, 1999

Introduction

The Oregon potato variety development program evaluates potato lines through the selection process until they are discarded or, as occurs more rarely, named and released as a variety. The Malheur Experiment Station is one of the sites conducting the Oregon Preliminary, Oregon Statewide, and Western Regional trials. Over 100 selections were included in these trials at Ontario in 1999. This report summarizes the performance of potato varieties and lines at Ontario in 1999.

Materials and Methods

The Preliminary Yield Variety Trial, the Statewide Variety Trial, and the Western Regional Early and Late Harvest Trials were planted April 19 through 21, 1999, in the same field of Owyhee silt loam and received the same management practices throughout the season. The Preliminary Yield Trial included 5 standard varieties and 101 numbered selections in 20-hill plots with 2 replications. The Statewide Variety Trial had 5 standard varieties and 19 numbered selections, in 30-hill plots replicated 4 times. The Western Regional Early Harvest Trial had 4 standard varieties and 13 numbered selections, and Late Harvest Trial had 4 standard varieties and 11 numbered selections, in 30-hill plots with 4 replications. All trials were arranged in a randomized complete block design and were furrow irrigated.

Treated 2-oz seed pieces were planted 9 in deep with rows spaced 36 in apart. Urea was sidedressed after planting at 114 lb N/acre. Weeds were controlled with the herbicides Prowl at 1 lb ai/acre and Dual at 2 lb ai/acre applied May 17 and incorporated with a rolling cultivator. The crop was protected from disease by aerial application of registered fungicide. No late blight was present in 1999.

The Early Harvest Trial potato vines were shredded with a flail mower August 8, and tubers were lifted with a mechanical potato digger and picked by hand into burlap bags on August 9. On September 17, the vines were flailed on the other trials. The Preliminary Yield Trial was harvested September 24, the Western Regional Late Trial September 27, and the Statewide Trial was harvested September 28. Tubers were lifted with a mechanical potato digger and picked by hand into burlap bags. External tuber characteristics were noted in each plot during harvest. The potatoes were stored under tarps in a shed until they were graded into US Number One tubers (4 to 6 oz, 6 to 12 oz, and over 12 oz), US Number Two tubers (over 4 oz), tubers under 4 oz, and culls.

Twenty-tuber samples of each variety in each plot were taken from all trials and placed in storage at 45 oF. In December, the tubers were evaluated for specific gravity and fry color. Specific gravity was measured by the weight-in-air, weight-in-water method. Ten large (usually over 10 ounces) tubers from each plot were cut lengthwise and inspected for internal defects. The data on external characteristics and internal defects are not presented in this report. Data on yield, grade, and processing quality were evaluated using NCSS software and ANOVA. Where significant differences were present, the LSD (0.05) was calculated.

Results and Discussion

Preliminary Yield Trial. Most of the entries in this trial were selections from crosses made at Aberdeen, Idaho, in 1994 and 1995 (Table 1). Yields were acceptable, but most of the selections had many off-type, rough, or growth cracked tubers. After reviewing data from Hermiston, Klamath Falls, Powell Butte, and Ontario, only 6 selections of the 101 tested were advanced for further evaluation in the 2000 Statewide trial. The varieties that were advanced are marked with an asterisk in the variety number column of Table 1.

Statewide Variety Trial. The overall quality and performance of entries in this trial was very good (Table 2). Russet Burbank produced a high total yield but produced many US Number Two tubers and culls. Most of the russet-skinned selections were attractive in appearance, had relatively good tuber type, produced high yields, and had fewer external and internal defects than Russet Burbank.

Ranger Russet, Atlantic, and seven experimental lines produced more than 400 cwt/acre of US Number One yield at Ontario in 1999. After reviewing data from Hermiston, Klamath Falls, Powell Butte, and Ontario, only 7 of the 19 experimental lines tested were retained for further evaluation in the 2000 Statewide trial. The varieties that were retained are marked with an asterisk in the variety number column of Table 2. The line AO85165-1 graduated from the trials and is being released as Klamath Russet. The selections AO92007-2, COO93031-3 and two tuber types of AO89128-4 were advanced to the Tri State Trial for 2000. The line AO90319-1 was advanced to a specialty trial.

Western Regional Early and Late Harvest Trials. At Ontario, Russet Burbank had among the lowest yield of US Number One tubers and among the highest yield of US Number Two tubers and culls of all entries (Table 3). In the early harvest trial, the selections A82360-7 and AC87079-3 were among the most productive of US Number One tubers at Ontario. In the late harvest trial, the selections AO92023-3, AC87084-3, CO89036-10, and TXNS296 were among the most productive of US Number One tubers at Ontario.

Varieties are dropped or selected for release based on a large number of criteria and performance at multiple sites for three or more years. Oregon, Washington, Idaho, California, Colorado, New Mexico, and Texas cooperate in the trials. After the 1999 season, the lines A88338-1 and CO89036-10 were dropped. The lines AC87084-3, AO87277-6, and NDD840-1 graduated for potential release.

Summary

The quality of advanced selections in the Oregon and regional potato variety development programs was excellent. Oregon released Umatilla and Legend Russet in 1998. Idaho released a red-skinned selection, A82705-1R, as Idarose in 1999. Idaho also released Bannock Russet and Gem Russet in 1999. Oregon is releasing two red varieties and one russet in 2000. Klamath Russet (AO85165-1) is a high yielding long russet with excellent appearance and yield in the Klamath Basin and perhaps elsewhere. Mazama and Winema are the newly released red varieties.

Table 1. Yield, grade, fry color, and specific gravity of standard potato varieties and 11 lines selected for further evaluation from the Preliminary Yield Trial, Malheur Experiment Station, Oregon State University, Ontario, Oregon, 1999.

      US Number One          
Variety Entry Total yield Percent

No. One

Total < 12

oz

4 to 12

oz

> 4

oz

US Number Two Rot Length to width ratio Spec. gravity Fry color, light reflectance 
    cwt/acre % ---------------------------cwt/acre-----------------------     %
Russet Burbank 1 529 54 288 31 257 77 149 15 1.90 1.078 38.7
Ranger 2 655 68 442 60 383 65 144 3 2.00 1.094 48.1
Shepody 3 446 79 354 185 169 20 69 3 1.64 1.079 45.3
Norkotah 4 511 66 337 38 299 114 54 7 1.76 1.070 39.3
Atlantic 5 641 73 469 71 398 140 31 2 1.05 1.089 51.1
AO92115-5 6 483 72 347 90 258 46 75 15 1.86 1.092 45.0
AO92252-2 7 252 61 153 44 109 25 74 0 1.92 1.077 44.0
AO92279-4 8 491 70 345 31 314 95 44 8 1.66 1.093 47.3
AO92342-3 9 488 75 365 85 280 43 64 16 1.62 1.092 44.7
AO94002-203 10 358 58 206 0 206 149 2 0 1.18 1.089 52.1
AO94002-9 11 586 65 381 33 348 130 74 2 1.75 1.089 49.6
AO94004-9 12 380 64 243 0 243 99 39 0 2.09 1.081 38.9
AO94006-2 13 524 65 340 55 286 67 89 28 2.09 1.068 41.3
AO94006-202 14 517 70 362 38 324 120 35 0 1.78 1.095 55.4
AO94006-7 15 484 68 329 62 267 67 89 0 1.63 1.085 50.1
AO94023-5 16 582 79 460 217 243 24 93 5 1.61 1.082 44.3
AO94024-201 17 573 70 401 26 375 104 52 16 1.68 1.087 49.1
AO94024-6 18 494 62 305 115 190 97 91 1 1.56 1.078 41.9
AO94029-2 19 535 56 299 120 179 39 197 0 1.75 1.081 40.3
AO94036-1 20 516 70 362 154 207 21 115 18 1.74 1.089 49.6
AO94073-202 21 472 80 380 156 224 43 47 2 1.74 1.071 37.9
AO94110-203 22* 587 63 370 61 309 78 125 13 1.82 1.096 50.8
AO94110-4 23 545 74 405 61 344 81 59 0 1.43 1.075 38.8
AO94112-7 24 457 62 285 15 269 69 103 0 1.73 1.072 45.1
AO94116-2 25 396 80 315 130 185 41 40 0 1.70 1.073 37.2
AO94117-201 26* 738 69 508 90 419 59 154 16 1.81 1.087 64.3
AO94128-3 27 417 85 354 112 242 26 38 0 1.76 1.073 45.2
AO94133-201 28 567 70 397 87 310 74 93 2 2.06 1.094 72.9
AO94137-2 29 508 66 336 124 212 59 112 0 1.78 1.087 46.6
Table 1. Yield, grade, fry color, and specific gravity of standard potato varieties and 11 lines selected for further evaluation from the Preliminary Yield Trial, Malheur Experiment Station, Oregon State University, Ontario, Oregon, 1999 (continued).
      US Number One          
Variety Entry Total yield Percent

No. One

Total < 12

oz

4 to 12

oz

> 4

oz

US Number Two Rot Length to width ratio Spec. gravity Fry color, light reflectance 
    cwt/acre % ---------------------------cwt/acre-----------------------     %
AO94139-201 30 568 75 428 247 181 19 114 9 1.83 1.087 47.2
AO94149-3 31 478 70 333 117 216 28 117 0 1.68 1.083 50.7
AO94150-3 32 470 74 348 86 262 35 46 40 1.98 1.094 46.8
AO94167-2 33 478 66 316 20 296 136 23 3 2.02 1.085 42.4
AO94171-2 34* 611 59 362 21 341 121 118 10 1.85 1.091 44.6
AO94175-6 35 517 75 386 127 259 48 81 1 1.86 1.088 55.6
AO94184-201 36 433 70 302 120 182 43 57 31 1.55 1.085 49.6
AO94186-5 37 354 74 262 64 198 31 58 3 1.92 1.077 46.0
AO94192-1 38 553 75 417 52 366 69 67 0 1.92 1.091 49.1
AO94201-201 39 342 70 241 8 232 70 23 8 1.94 1.074 48.2
AO94231-201 40 491 45 220 61 159 63 176 32 1.86 1.085 47.8
AO94243-202 41 657 56 371 5 365 233 54 0 1.50 1.082 41.8
AO95100-2 42 412 75 309 134 175 24 78 0 1.73 1.094 44.2
AO95100-3 43 475 64 302 49 252 36 108 29 2.20 1.100 52.8
AO95101-4 44 391 82 321 70 251 32 35 2 2.13 1.092 27.1
AO95102-1 45 429 79 340 243 97 14 73 3 2.06 1.080 49.9
AO95103-3 46 493 71 349 3 346 87 53 5 1.91 1.085 49.0
AO95105-1 47 584 70 408 129 279 49 124 3 1.92 1.076 48.2
AO95105-2 48 447 75 337 32 305 80 30 0 1.73 1.085 47.0
AO95105-3 49 565 66 375 4 371 165 18 7 1.78 1.087 51.3
AO95106-2 50 495 62 308 24 284 55 86 45 1.88 1.091 54.1
AO95106-3 51 515 78 403 121 281 29 81 2 1.68 1.080 46.2
AO95106-6 52 535 63 335 12 324 130 68 2 2.16 1.083 48.3
AO95112-1 53 602 67 404 81 323 112 85 0 1.87 1.080 48.6
AO95115-1 54 597 73 438 127 311 67 81 12 1.64 1.080 40.1
AO95115-2 55 510 69 354 85 269 33 123 0 1.69 1.093 49.0
AO95115-3 56* 528 70 368 26 342 108 52  1.81 1.088 47.5
AO95115-5 57 368 67 246 94 151 43 78 2 1.85 1.073 45.2
Table 1. Yield, grade, fry color, and specific gravity of standard potato varieties and 11 lines selected for further evaluation from the Preliminary Yield Trial, Malheur Experiment Station, Oregon State University, Ontario, Oregon, 1999 (continued).
      US Number One      
Variety Entry Total yield Percent

No. One

Total < 12

oz

4 to 12

oz

> 4

oz

US Number Two Rot Length to width ratio Spec. gravity Fry color, light reflectance 
    cwt/acre % ---------------------------cwt/acre-----------------------     %
AO95115-6 58* 540 77 413 84 329 85 42 0 1.74 1.073 38.8
AO95117-1 59 450 74 331 153 179 19 97 2 2.17 1.079 45.5
AO95123-1 60 515 75 388 70 318 77 45 5 1.84 1.090 57.3
AO95125-1 61 494 75 371 145 226 36 69 18 1.84 1.077 43.2
AO95125-2 62 462 76 349 68 281 78 34 0 1.68 1.074 22.6
AO95125-4 63 534 58 307 86 221 43 175 9 1.88 1.083 46.5
AO95125-7 64 662 69 455 89 366 29 169 9 1.40 1.073 46.5
AO95133-1 65 466 68 317 127 190 28 95 26 1.87 1.082 55.7
AO95135-1 66 593 76 448 253 196 29 93 23 1.96 1.081 49.3
AO95135-2 67 461 72 330 63 266 63 66 2 1.80 1.095 51.6
AO95135-5 68* 630 77 486 155 331 50 91 3 1.78 1.084 41.2
AO95135-6 69 482 67 325 62 263 44 97 16 1.82 1.083 47.6
AO95151-4 70 641 63 407 225 182 26 183 26 1.94 1.077 42.3
AO95160-1 71 587 75 441 184 257 41 102 3 1.64 1.094 45.6
AO95163-1 72 514 57 294 11 283 162 55 3 1.89 1.082 49.9
AO95167-3 73 530 58 306 107 199 46 166 12 2.13 1.087 50.4
AO95169-2 74 535 63 339 14 324 93 102 0 1.80 1.083 50.5
AO95173-1 75 510 81 412 111 301 44 37 17 1.82 1.091 52.2
AO95179-1 76 554 74 412 61 351 84 49 9 1.62 1.084 50.6
AO95179-2 77 520 65 336 49 287 62 118 5 1.71 1.083 46.5
AO95184-1 78 620 72 446 170 276 53 116 4 1.90 1.085 50.0
AO95188-3 79 437 63 275 39 236 65 86 10 1.64 1.077 49.8
AO95195-3 80 570 71 405 21 384 85 80 0 1.80 1.083 55.0
AO95199-3 81 488 60 293 55 238 78 116 0 2.17 1.088 47.2
AO95202-4 82 496 74 367 135 232 18 97 15 1.84 1.102 55.0
AO95205-3 83 416 56 233 43 190 131 48 5 2.00 1.082 44.7
AO95206-2 84 478 65 312 41 271 127 35 5 1.79 1.079 43.5
AO95215-1 85 473 73 345 187 158 30 85 12 1.94 1.095 54.3
Table 1. Yield, grade, fry color, and specific gravity of standard potato varieties and 11 lines selected for further evaluation from the Preliminary Yield Trial, Malheur Experiment Station, Oregon State University, Ontario, Oregon, 1999 (continued).
      US Number One          
Variety Entry Total yield Percent

No. One

Total < 12

oz

4 to 12

oz

> 4

oz

US Number Two Rot Length to width ratio Spec. gravity Fry color, light reflectance 
    cwt/acre % ---------------------------cwt/acre-----------------------     %
AO95215-2 86 535 72 388 164 224 15 133 0 1.67 1.098 55.2
AO95215-3 87 476 71 340 24 315 71 65 0 1.86 1.083 50.1
AO95227-2 88 377 72 270 58 211 24 53 31 1.88 1.102 53.0
AO95230-1 89 460 46 211 8 202 205 44 0 1.96 1.092 49.2
AO95230-2 90 476 75 358 17 341 105 13 0 1.71 1.087 49.1
AO95230-3 91 512 72 370 64 306 67 75 0 1.76 1.091 48.4
AO95233-1 92 490 73 358 11 347 72 54 6 1.92 1.091 59.5
AO95241-2 93 454 60 271 36 235 54 125 5 1.92 1.083 59.2
AO95329-1 94 506 65 330 26 304 105 63 8 1.52 1.086 49.3
AO95329-2 95 572 71 404 177 227 27 141 0 1.69 1.076 51.7
AO95329-4 96 588 73 432 59 373 100 51 5 1.54 1.072 45.3
AO95352-2 97 545 69 376 35 341 66 94 10 1.78 1.093 49.9
AO95118-201 98 516 76 393 167 226 12 100 11 1.71 1.082 45.9
AO95227-203 99 510 73 373 4 369 118 13 6 1.52 1.092 53.8
AO95232-202 100 452 83 377 22 355 43 31 2 1.48 1.096 50.2
COO94024-2 101 553 77 427 73 355 79 39 7 1.54 1.073 42.6
COO95007-1 102 502 56 281 37 244 52 152 18 2.69 1.084 48.2
COO95019-1 103 567 69 390 54 337 37 138 2 1.34 1.087 49.6
COO95024-1 104 558 64 356 68 288 26 165 11 1.88 1.087 46.0
COO95164-1 105 502 74 374 167 207 20 104 5 1.81 1.077 43.8
AO94266-3 106 474 65 306 45 261 43 115 11 2.20 1.102 52.2
*advanced to Statewide                    

Table 2. Yield, grade, fry color, and specific gravity of 24 potato varieties and selections in the Oregon Statewide Variety Trial, Malheur Experiment Station, Oregon State University, Ontario, Oregon, 1999.
        US Number One        
Variety Entry Total yield Percent

No. One

Total < 12

oz

4 to 12

oz

> 4

oz

US Number Two Rot Spec. gravity Fry color, light reflectance
    cwt/acre % ---------------------------cwt/acre-----------------------      
Russet Burbank 1 498 50 248 37 191 77 133 41 1.080 37.7
Ranger 2 601 67 405 97 351 52 133 12 1.100 45.7
Shepody 3 506 70 355 100 288 42 103 5 1.090 48.1
Norkotah 4 491 65 319 116 272 36 130 6 1.099 45.0
Atlantic 5 579 81 468 83 339 75 33 3 1.092 49.6
AO85165-1 6 468 81 381 183 337 34 47 6 1.081 41.3
AO87277-6 7* 632 74 468 78 367 53 99 11 1.096 46.3
AO89128-4 8* 515 60 311 28 205 80 115 9 1.099 57.1
AO90014-1 9 434 74 322 37 241 63 38 12 1.091 52.6
AO90319-1 10 491 72 354 47 235 88 42 7 1.095 42.1
AO91812-1 11* 581 77 445 49 309 78 39 19 1.096 50.0
AO92007-2 12* 559 73 409 106 351 44 90 15 1.088 44.1
AO92017-6 13* 602 59 355 63 274 36 185 27 1.094 47.2
COO93031-3 14* 577 78 451 160 364 43 76 7 1.083 39.2
AO92252-1 15* 521 82 426 105 372 29 65  1.095 49.0
AO92378-1 16 464 81 377 127 309 34 50 3 1.098 50.1
AO93317-5 17 595 80 475 56 354 49 64 7 1.090 48.8
AO94169-8 18 511 72 366 119 319 41 91 13 1.077 34.5
AO94203-3 19 384 83 320 171 295 15 42 7 1.090 48.1
AO94204-2 20 468 83 390 205 352 22 45 11 1.084 36.6
AO94204-7 21 506 68 345 139 307 21 129 11 1.078 44.7
AO94205-1 22 512 70 360 28 223 97 51 4 1.087 49.1
AO94218-1 23 576 77 443 61 350 44 67 23 1.080 43.5
AO94224-1 24 533 74 396 72 322 48 71 18 1.090 42.9
Mean   525 73 383 94 289 50 81 10 1.090 45.5
LSD (0.05)   2 10 73 50 82 23 46 23 0.005 3.1

*retained in the Statewide Trial for 2000

Table 3. Yield, grade, fry color, and specific gravity of potato varieties and selections in the Western Regional Early and Late Harvest Trials, Malheur Experiment Station, Oregon State University, Ontario, Oregon, 1999.

Western Regional Early Harvest Trial
      US Number One        
Variety Total yield Percent

No. One

Total < 12

oz

6 to 12 oz 4 to 6

oz

> 4

oz

US Number Two Rot Spec. gravity Fry color, light reflectance
    % ----------------------------------cwt/acre-----------------------------------    
Russet Burbank 531 67 359 10 296 54 109 63 0 1.077 39.4
Ranger 489 81 393 58 291 44 49 40 7 1.088 47.4
Norkotah 503 78 393 19 285 90 89 20 0 1.074 39.7
Shepody 491 82 404 101 252 51 48 39 0 1.078 47.8
AO87277-6 534 88 466 44 340 82 50 15 3 1.089 46.4
A88338-1 492 81 398 72 273 53 47 41 6 1.071 44.9
A8893-1 548 83 455 79 295 81 65 23 5 1.077 48.6
A9014-1 486 88 426 93 295 38 40 18 2 1.079 50.3
AC87138-4 571 75 426 18 281 126 130 14 2 1.083 40.9
AC87079-3 523 87 454 71 335 49 47 20 3 1.090 46.3
AC87084-3 422 86 362 74 253 35 47 13 0 1.081 34.3
CO89036-10 543 79 430 36 271 123 91 20 3 1.080 32.9
TXNS102 556 71 392 5 299 88 142 22 0 1.077 40.5
TXNS296 573 78 446 47 320 80 95 30 3 1.076 34.5
PORTGNP3-138 537 69 373 17 251 105 150 14 0 1.073 40.9
PORTGNS124-1 505 87 437 120 266 50 42 26  1.082 49.1
PORTGNS129-1 515 80 414 61 312 41 64 34 3 1.086 52.5
Mean 519 80 413 54 289 70 77 27 2 1.080 43.3
LSD(0.05) 65 7 68 44 82 47 22 20 7 0.007 3.9
                       
Table 3. Yield, grade, fry color, and specific gravity of potato varieties and selections in the Western Regional Early and Late Harvest Trials, Malheur Experiment Station, Oregon State University, Ontario, Oregon, 1999. (continued)
Western Regional Late Harvest Trial
      US Number One        
Variety Total yield Percent

No. One

Total < 12

oz

6 to 12 oz 4 to 6

oz

> 4

oz

US Number Two Rot Spec. gravity Fry color, light reflectance
    % --------------------------------------cwt/acre---------------------------------------    
Russet Burbank 464 52 284 42 173 70 87 154 21 1.079 35.8
Ranger 508 63 331 69 201 61 63 118 11 1.104 48.5
Norkotah 522 78 360 81 196 83 60 40 4 1.075 37.1
Umatilla 612 70 419 55 214 150 95 80 2 1.094 48.4
AO92023-3 603 85 491 124 264 104 43 47  1.079 38.8
AO87277-6 565 73 424 70 261 93 56 97 4 1.100 46.9
A88338-1 545 66 372 147 175 50 24 161 8 1.088 45.7
A8893-1 565 75 449 131 227 91 60 86 7 1.080 49.7
A9014-1 580 79 398 218 145 35 28 79 3 1.089 53.6
AC87084-3 581 76 462 83 262 117 57 83 3 1.101 47.8
AC87079-3 596 75 426 78 232 116 62 74 4 1.098 45.6
AC87138-4 600 73 437 60 205 172 113 50 1 1.098 45.7
CO89036-10 585 76 461 85 231 145 85 55 3 1.091 40.0
TXNS102 605 67 393 46 224 123 105 82 6 1.080 40.9
TXNS296 605 75 461 99 227 135 88 61 2 1.076 39.1
Mean 569 72 411 93 216 103 68 85 5 1.089 44.2
LSD (0.05) 65 8 65 46 39 39 23 43 7 0.004 4.6