UC Almond Variety Trials Reveal Clear Result - West Coast Nut

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UC Almond Variety Trials Reveal Clear Result

By Marni Katz | Editor
Published: June 15, 2022 • 42 views

Yorizane is one newer self-fertile variety that has been studied extensively in regional UC trials (photo courtesy Roger Duncan, UCCE.)

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UC researchers plan to plant a new set of regional variety trials for almonds, adding to the growing breadth of information available to growers about yield, kernel quality and growing characteristics of new and experimental varieties of almonds.

In 2014, UC, with funding from Almond Board of California, embarked on a project to evaluate new and experimental varieties produced from UC Davis, USDA and commercial California nurseries. 29 varieties are being tested side-by-side in replicated field trials planted in Madera, Stanislaus and Butte counties.

In Madera County, trees are on Hansen 536 rootstock and planted at a 12’ x 21’ spacing (173 trees per acre). In Stanislaus, trees are on Nemaguard and planted at 16’ x 21’ (130 trees per acre), and in Butte, trees are on Krymsk 86 and planted at 18’ x 22’ (110 trees per acre).

Nonpareil is planted every other row, and the experimental varieties are planted as pollinizers. Each variety is replicated four times in each location, so confidence in the yield data is maximized. At least 14 of the tested varieties are self-fertile, meaning they can be planted in solid blocks with fewer bees, according to UCCE Farm Advisor Roger Duncan, who has overseen the trials since its planting.

Now in their ninth season, Duncan said researchers and growers are starting to get a good idea of yield, kernel defects, disease or growing problems and production timing for these varieties. See results in tables below.

 

 

Variety Breeder/Nursery Variety Breeder/Nursery
Self-sterile Partially Self-fertile
Eddie Bright's Sweetheart UC Davis
Supareil Burchell Winters UC Davis
Sterling Burchell
Booth Burchell Fully self-fertile
Capitola Burchell UCD1-232 UC Davis
Folsom Dave Wilson UCD1-271 UC Davis
Bennett-Hickman Duarte UCD7-159 UC Davis
Jenette Fowler UCD8-160 UC Davis
Durango Fowler UCD8-201 UC Davis
Kester UC Davis UCD8-27 UC Davis
UCD18-20 UC Davis Yorizane USDA
UCD1-16 UC Davis Y117-86-03 USDA
UCD3-40 UC Davis Y117-91-03 USDA
Aldrich N/A Y121-42-99 USDA
Nonpareil N/A P16.013 Burchell
P13.019 Burchell

 

 

 

Average Cumulative Yield for the First Six Harvests, Canopy Size as Measured by Photosynthetically Active Radiation (PAR) and Yield per PAR.

Cumulative Yield per Acre 3rd – 8th leaf (2016 – 2021)

Average 2021 PAR

Average Cumulative Yield / PAR

Average of all 3 Sites

Butte County

Stanislaus County

Madera County

Nonpareil

14,864

16,527

11,451

16,613

71

209

Y117-91-03

13,819

13,619

13,927

13,939

68

203

UCD 18-20

13,686

14,232

12,015

14,812

66

207

Booth

13,054

14,035

10,834

14,292

72

181

Aldrich

12,614

14,297

11,126

12,420

64

197

 

 

 

Yorizane

12,382

11,367

10,295

15,822

59

210

Bennett

12,069

11,559

11,810

12,867

64

189

Durango

12,040

12,912

10,175

12,568

67

180

Kester

11,904

11,479

10,438

13,796

69

173

Y117-86-03

11,839

10,669

9,931

14,917

61

194

Capitola

11,756

11,469

9,603

14,195

72

163

Jenette

11,553

12,885

8,618

14,134

59

196

Winters

11,422

12,075

9,979

11,850

64

178

Eddie

10,984

10,592

9,982

12,379

67

164

UCD 8-160

10,930

10,627

10,307

11,856

50

219

UCD 8-201

10,857

10,543

9,475

12,207

59

184

Sterling

10,662

9,831

9,681

11,983

69

155

Folsom

10,643

11,137

9,103

11,690

75

142

UCD 7-159

10,255

10,469

10,440

9,724

60

171

Supareil

10,166

9,190

9,183

12,452

76

134

Sweetheart

10,130

9,741

9,122

11,526

72

141

UCD 1-16

9,545

10,209

7,381

11,044

64

149

UCD 1-232

9,350

9,205

9,555

9,193

57

164

UCD 8-27

9,130

9,727

7,259

10,402

66

138

UCD 1-271

7,721

7,175

8,653

6,948

63

123

 

 

 

 

Bloom and Harvest Dates Before (-) or After (+) Nonpareil

Full Bloom +/- NP

Harvest +/- NP

Y117-91-03

+3

-6

Eddie

-1

-2

Y121-42-99

+4

-1

Nonpareil

Yorizane

+2

-3

Kester

+4

+5

Sterling

0

+6

Folsom

+4

+7

Booth

0

+8

UCD8-201

+4

+9

P13.019

+4

+9

Capitola

-2

+10

UCD1-271

0

+10

Bennett

0

+11

Y117-86-03

+3

+12

Sweetheart

+2

+15

UCD1-16

-1

+16

UCD8-27

-3

+18

UCD7-159

-1

+19

Jeanette

0

+24

Supareil

-1

+24

Aldrich

0

+24

Durango

+1

+25

UCD8-160

0

+26

UCD1-232

+2

+32

Winters

-1

+33

UCD18-20

+1

+33

P16.013

+3

+36

UCD3-40

-10

+37

 

 

Marni Katz
Editor at JCS Marketing, Inc. | + posts

Marni Katz has lived and raised her family in the San Joaquin Valley for nearly 30 years. In that time, she has covered agriculture for a number of leading ag publications and organizations and gained a reputation for understanding and digesting complex information and presenting it to growers. She enjoys learning about new ways growers can farm more profitably and efficiently, and working with researchers and stakeholders to bring that information to the growing community. In her free time, Marni plays saxophone with jazz groups throughout the Valley and is an avid tennis nut.