Influence of Kaolin Clay Applications on Blueberry Yields during Low-Chill Seasons in West-Central Florida Bielinski M. Santos Gulf Coast Research and Education Center IFAS, University of Florida Reduce transpiration and sun scalding. Based on calcium carbonate, kaolin clay or wax. Surround WP. Degradable. Previous Studies with Kaolin a b b c a a b Early Fruit Weight (ton/acre) 4 3 2 a a a b Control 8 d + kaolin 6 d + kaolin 4 d + kaolin 1 0 Previous study: Kaolin clay application reduced bud temperatures. What happens during low-chilling winters? Would kaolin increase the number of chilling hours? Determine effects of foliar application programs of kaolin clay on the marketable yield of southern highbush blueberries. 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. Surround (25 lb/acre). Regular sprayer (100 gal/acre of water). Non-treated, Weekly applications, Biweekly applications. 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. Treatment October November December None 48 44 35 Weekly 42 39 33 Biweekly 47 43 35 Treatment October November December None 45 40 36 Weekly 41 36 33 Biweekly 45 39 35 Treatment Early Total ton/acre None Weekly Biweekly Significance 1.30 b 1.68 a 1.31 b * 2.16 2.47 2.20 NS 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?