A Sunny Disposition: Managing Light in Orchard Systems. Tom Kon Southeastern Apple Research Specialist

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1 A Sunny Disposition: Managing Light in Orchard Systems Tom Kon Southeastern Apple Research Specialist

2 Thank you for the warm welcome to the Southeast!

3 Why is light important in apple production?

4

5

6 As light interception increases

7 Outline I. Increasing light interception in orchard systems II. Increasing light distribution in orchard systems I. Mechanization and automation in modern orchard systems

8

9 Ida Reds Interstem x yrs old

10 Practices to increase light interception Increase planting density Reduce distance between rows Increase tree height N S row orientation

11 Canopy light interception vs. yield (Wünsche and Lakso, 2000)

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13

14 Size-Controlling Rootstocks

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16 Rootstocks Rootstock selections are site dependent Growers are anxious for greater access to fire blight resistant rootstocks (Geneva Series) TC Vigor of scion, rootstock, and soil dictate in-row spacing

17 > 30 Named Apple Training Systems 2 spherical canopies 13 are cone shaped canopies 7 are planar (palmette) 8 are V or Y canopies (leaned over cones or palmettes) Managing Light is the key in any system!!

18 Ida Reds Interstem x yrs old

19 Tall Spindle near Bolzano Italy

20 Light Distribution: Even dwarfed trees have a zone of inadequate light! Min. % Full Sun: Flowering: 30% Photosynthesis: 30% Color and Quality:50%

21 One size fits all? Site / terrain? Irrigation? Business model? Wholesale vs U-pick Processing vs. Fresh Equipment High establishment costs Tree support system Greater risk

22 Tall Spindle Tall for light interception in single row. Narrow for light distribution, labor access. Planted at 3 x 12 ft - produced 300 bu/acre in year 2!

23 V Trellis Best light interception Can access with larger equipment High establishment costs

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26 Multi-leader canopies : Bi-Baum

27 Alberto Dorigoni Univ. Bologna

28 Canopy light interception vs. yield (Wünsche and Lakso, 2000)

29 Tustin, et. al

30 Tustin et. al ~10 ft between trees, ~ 5 to 6.5 ft between rows trees/acres Each tree has 10 vertical fruiting stems every 12 inches Vertical fruiting stems 11.5 ft tall In theory, yields bins/acre

31 Outline I. Increasing light interception in orchard systems II. Increasing light distribution in orchard systems I. Mechanization and automation in modern orchard systems

32 Practices to improve light distribution Spreading/training limbs to a horizontal Annual dormant pruning Summer pruning (watersprouts)

33 Before T r e e After T r a i n i n g

34 Pruning: Why is it important? Pruning: cutting away of a portion of a plant for horticultural purposes to modify canopy shape, renew bearing surface, increase light & spray distribution within canopy. Most pruning is done to improve light distribution for increasing fruit quality.

35

36 Jim Schupp, Edwin Winzeler, and Melanie Schupp

37 LCSA/TCSA = 1.75 LCSA/TCSA = 1.00 LCSA/TCSA= 0.50

38 MD: Maximum Allowable Branch Diameter LT = 1.25 LT = 1.25 LT = 1.25 LT = 1.25 Max. allowable branch diameter Trunk diameter

39 Summary: Size Matters Goal: to do 70% pruning = 90% benefit We can reach this goal with one rule

40

41 Video Imaging for Automation Cameras can see about 2 feet into canopy

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44 Vacuum Harvester

45 Summary Light interception and distribution plays a key role in physiological processes and orchard productivity Orchard design and Standard cultural management practices New/future plantings: Consider modern / more efficient rootstocks Consider new / future technologies

46 An Ultramodern Fruit and Vegetable Packing System: New Opportunities in Research and Education Programs Tom Kon, Diane Ducharme, Chris Gunter, Frank Louws, Inga Meadows, Dilip Panthee, Mike Parker, Penny Perkins, Sara Villani, and Jim Walgenbach Project was funded by the College of Agriculture and Life Sciences at NC State! Letters of support: NC Apple Growers Association and Blue Ridge Apple Growers Association

47 Thank you for your attention and support!

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