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Pruning, Spacing Tomatoes in High Tunnels 2012
1. Pruning and Spacing
Tomatoes in High
Tunnels
Terrance T, Nennich
Extension Professor
Fruit and Vegetable Production
University of Minnesota Extension
2. NCROC
These studies were conducted at the North
Central Research and Outreach Center , Grand
Rapids Minnesota
8. Determinate Types
Bush tomatoes
Ends with terminal buds
Easier to prune
Growth is smaller
Most new releases are determinate
Act different in high tunnels
9. Pruning Determinant
Types
Wait until plant has first flowers and tomato is the
size of a nickel
Going down skip one branch
Prune out everything below
Can be pruned to one or two leaders
This will increase size and make a earlier harvest.
14. Determinate Tomato Pruning Study
Lbs/Plant Ripe Fruit Harvest
Pruning 1st % # Fruit/ Lbs / Lbs/
Early* Ripe
Treatment Ripe Good Plant Fruit Sq. Ft.
2003-Cultivar Debut
Single Stem 7/24 2.5 8.8 63% 17.0 0.534 1.40
Double Stem 7/21 1.9 12.3 58% 25.2 0.505 1.95
2004-Cultivar Sunshine
Single Stem 7/26 1.6 10.5 76% 19.6 0.534 1.67
Double Stem 7/23 1.2 12.1 73% 23.2 0.523 1.92
No Prune 8/9 0.0 22.1 81% 47.8 0.462 3.51
* Early harvest through 8/2
15.
16.
17. Do not over prune. Fruit needs leaf cover to prevent sunburn.
Source: L. Kamar
18. Indeterminate Types
Continual Growth
7-15 foot of height.
Continual tomato production
Even production
Smaller production in given time.
19.
20. Pruning Indeterminate
Types
Wait until plant has first flowers and tomato is the
size of a nickel
Going down skip one sucker branch
Prune out everything below
Can be pruned to one or two leaders
All suckers must be removed during the season.
24. Indeterminate Tomato Pruning Study- Cobra
2004 Lbs/Plant Ripe Fruit Harvest
Pruning 1st % # Fruit/ Lbs / Lbs/
Early* Ripe
Treatments Ripe Good Plant Fruit Sq. Ft.
Single Stem 8/6 0.1 15.5 74% 35.6 0.436 2.46
Double Stem 8/12 0.0 17.0 73% 46.4 0.367 1.70
No Prune 8/19 0.0 13.6 61% 47.8 0.286 2.16
* Early harvest through 8/2/04
25. 2006 Indeterminate Tomato Production - Cobra
Lbs/Plant Ripe Fruit Harvest
1st % # Fruit/ Lbs / Lbs/
Early* Ripe Total
Treatment Ripe Good Plant Fruit Sq. Ft.
Spacing
18" 7/20 5.8 15.7 24.9 b 64% 40.7 b 0.392 2.50
24" 7/20 7.2 19.5 29.7 a 66% 48.1 a 0.407 2.32
Stems
Single 7/19 6.7 16.2 24.8 b 65% 37.7 b 0.428 a 2.23
Double 7/21 6.4 19.0 29.8 a 64% 51.1 a 0.372 b 2.58
* Early harvest through 8/2/06
26.
27.
28.
29. Sanitation
Prune with clean tools
Disinfect while using
If there any plants that are stunted
or diseased do them last or pull
them out.
33. 2006 Determinate Tomato Production
– Sunstart
Lbs/Plant Ripe Fruit Harvest
% # Fruit/ Lbs/ Lbs/
Early* Ripe Total
Treatment Good Plant Fruit Sq. Ft.
Stems x Spacing
Single 12" 5.15 b 7.47 b 11.00 c 69% 18.4 b 0.409 1.78 bc
Single 18" 5.10 b 8.70 b 12.52 c 70% 20.0 b 0.440 1.38 cd
Single 24" 5.20 b 7.95 b 11.99 c 66% 17.6 b 0.459 0.95 d
Double 12" 6.52 ab 9.50 ab 14.51 bc 65% 23.3 ab 0.410 2.26 a
Double 18" 7.60 a 12.13 a 17.62 ab 70% 29.0 a 0.421 1.93 ab
Double 24" 7.51 a 11.95 a 18.66 a 65% 28.2 a 0.425 1.42 cd
* Early harvest through 8/2/06
34. 2006 Determinate Tomato Production
- Sunstart
Lbs/Plant Ripe Fruit Harvest
1st % # Fruit/ Lbs/ Lbs/
Early* Ripe Total
Treatment Ripe Good Plant Fruit Sq. Ft.
Spacing
12" 7/8 5.8 8.5 b 12.8 67% 20.9 0.409 2.02 a
18" 7/6 6.4 10.4 a 15.1 70% 24.5 0.431 1.66 b
24" 7/7 6.4 10.0 ab 15.3 65% 22.9 0.442 1.18 c
Stems
Single 7/7 5.2 b 8.0 b 11.8 b 68% 18.7 b 0.436 1.37 b
Double 7/7 7.2 a 11.2 a 16.9 a 67% 26.8 a 0.419 1.87 a
* Early harvest through 8/2/06
35. Sunstart Yield By Fruit Category
(lbs/sq. ft.)
Treatment Early* Good Spoiled Immature Total
Single 12" 1.23 b 1.78 bc 0.60 ab 0.24 cd 2.62 bc
Single 18" 0.81 cd 1.38 cd 0.27 c 0.34 bc 1.99 cd
Single 24" 0.62 d 0.95 cd 0.33 c 0.15 cd 1.43 d
Double 12" 1.55 a 2.26 a 0.63 a 0.57 a 3.46 a
Double 18" 1.21 b 1.93 ab 0.46 abc 0.41 ab 2.80 ab
Double 24" 0.89 c 1.42 cd 0.40 bc 0.40 abc 2.22 bc
* Early harvest through 8/2/06
36. 2006 Indeterminate Tomato Production – Cobra
Lbs/Plant Ripe Fruit Harvest
1st % # Fruit/ Lbs / Lbs/
Early* Ripe Total
Treatment Ripe Good Plant Fruit Sq. Ft.
Stems x Spacing
Single 18" 7/19 6.4 15.4 24.1 b 64% 61.3 c 0.434 a 2.44 ab
Single 24" 7/19 6.9 17.0 25.7 b 67% 67.9 bc 0.422 a 2.03 b
Double 18" 7/20 5.2 16.1 25.5 b 64% 82.5 b 0.350 b 2.55 ab
Double 24" 7/21 7.6 21.9 33.9 a 65% 96.7 a 0.393 ab 2.60 a
* Early harvest through 8/2/06