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Effects of Mechanical harvesting on Tree Health and Yield - PowerPoint PPT Presentation


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Effects of Mechanical harvesting on Tree Health and Yield. Kuo-Tan Li Jim Syvertsen UF, IFAS Citrus Research & Education Center Lake Alfred 6 Apr 2006. ? Compensation for defoliation M H and abscission chemicals ? 20% def. No yield reduction even at 50 % def.

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Presentation Transcript
slide1

Effects of Mechanical harvesting on Tree Health and Yield

Kuo-Tan Li

Jim Syvertsen

UF, IFAS

Citrus Research & Education Center

Lake Alfred

6 Apr 2006

slide2

? Compensation for defoliation

M H and abscission chemicals? 20%def.No yield reduction even at 50 % def.

for 2 years (Yuan et al. 2005)

‘Valencia’ May 2003

P < 0.05

Leaf Photosynthesis

0 12 25 50 %

% Defoliation

(G-Sanchez

et al. 2003)

slide3

Defoliation – Light Interception

Avg. 10 to 12% leaf area removed

No affect on leaf photosynthesis

No affect on canopy light interception or leaf area next year

slide4

Flower Loss: Nodes?

Avg. 10 to 12%

leaf area removed

Does not affect leaf photosynthesis

No affect on canopy light interception, leaf area, or returnbloom next year

slide5

Petal fall –Flower loss

10 to 15% fruitlets removed when harvested at bloom

Does not reduce final fruit set

Does not reduce next crop yield or fruit size

slide6

Petal fall -- Yield

10 to 15% fruitlet removed at bloom

Does not reduce final fruit set

Does not reduce next crop yield or fruit size

slide7

Effect of Mechanical harvesting on Tree Health and Yield

What do we know about mechanical harvesting on citrus tree health and yield?

No long term effect on ‘Hamlin’ yield (7- 8 years)

Yield Reduction in ‘Valencia’ when harvested late with or aggressive trunk shaking

Whitney et al.,

slide8

Problem:Visible Physical injuries to trees occur during mechanical harvesting:

Defoliation

Petal fall

Bark scuffing

Root exposure

slide9

Defoliation

Avg. 12 to 13% leaf area removed

No affect on leaf photosynthesis

Does not affect canopy light interception or leaf area next year

slide10

Effect of Mechanical harvesting on Tree Health and Yield

Physical injuries occur during mechanical harvesting:

Defoliation

Petal fall

Bark scuffing

Twig breakage

Root exposure

slide11

Bark scuffing

Replaced with new bark tissue within a year

Does not reduce growth increment

No increased disease infections or pest invasions

slide12

Physical injuries during mechanical harvesting:

Defoliation

Petal fall

Bark scuffing, Twig loss

Root exposure

Root death

Water Relations?

slide13

Root exposure – Drought stress

Little effect on root water and nutrient uptake, exc. excessive shaking and drought

Little effect on fine root growth

‘Hamlin’ after 2 weeks of drought

0.3” rain

Midday Drought stress

slide14

Root exposure

Little effect on root water and nutrient uptake, exc. excessive shaking and drought

Little effect on fine root growth

slide15

Root periscope

(K-T Li et al., 2005)

slide16

Video of Repeated

measurements

Root growth

through time

slide17

Effect of Mechanical harvesting on Tree Health and Yield

Summary

Annual variation in yield is not related to harvest methods

Visible Injuries by mechanical harvesting are relatively mild and do not affect tree health and return yield

2004

2005

slide18

Effect of Mechanical harvesting on Tree Health and Yield

Exception

Harvesting ‘Valencia’ after May can remove young fruit and reduce yield of next crop