Influence of Kaolin Clay Applications on Blueberry Yields during Low-Chill Seasons in West-Central...
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![Page 1: Influence of Kaolin Clay Applications on Blueberry Yields during Low-Chill Seasons in West-Central Florida Bielinski M. Santos Gulf Coast Research and.](https://reader036.fdocuments.in/reader036/viewer/2022062511/55194bd6550346af2d8b457a/html5/thumbnails/1.jpg)
Influence of Kaolin Clay Applications on Blueberry
Yields during Low-Chill Seasons in West-Central
FloridaBielinski M. Santos
Gulf Coast Research and Education CenterIFAS, University of Florida
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Crop Protectants
Reduce transpiration and sun scalding.
Based on calcium carbonate, kaolin clay or wax.
Surround WP.
Degradable.
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Previous Studies with Kaolin
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a b b c a a b
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Control 8 d + kaolin 6 d + kaolin 4 d + kaolin0
1
2
3
4
Early Fruit Weight (ton/acre)
a a a b
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Why Surround and Blueberries?
Previous study: Kaolin clay application reduced bud temperatures.
What happens during low-chilling winters?
Would kaolin increase the number of chilling hours?
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Objective
Determine effects of foliar application programs of kaolin clay on the marketable yield of southern highbush blueberries.
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Materials and Methods
Two-year study: 2011-12 & 2012-13.
Gulf Coast REC, Balm, Florida.
3-year-old ‘Jewel’ (1500 plants/acre).
Pine bark beds.
No hydrogen cyanamide.
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Materials and Methods
Surround (25 lb/acre).
Regular sprayer (100 gal/acre of water).
Non-treated, Weekly
applications,Biweekly
applications.
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Materials and Methods
Application from Sept. 15 to Dec. 15.
Eight harvests starting in early March.
Early and total fruit weights.
160 h ≤45oF between Sept. 1 and March 1 of each season.
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Bud Minimum Temp. 2011 (oF)
Treatment
OctoberNovemb
erDecemb
er
None 48 44 35
Weekly 42 39 33
Biweekly
47 43 35
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Bud Minimum Temp. 2012 (oF)
Treatment
OctoberNovemb
erDecemb
er
None 45 40 36
Weekly 41 36 33
Biweekly
45 39 35
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Treatment Early Totalton/acre
None 1.30 b 2.16Weekly 1.68 a 2.47
Biweekly 1.31 b 2.20Significanc
e * NS
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Summary
Surround seems to decrease bud temperatures.
Weekly applications (6 to 8) of Surround improved early yield (+29%).
More research needed in large fields.
What about regular winters?
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Thanks!bmsantos@ufl.
edu813-468-6322