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Department of Plant Sciences

UC Davis

Impact of Foliar Fertilizer Containing Iodine on “Golden Delicious” Apple Trees

Abstract

Abstract Iodine containing fertilizers were used for foliar treatments in 2008 on nine years old apple trees “Golden Delicious/M.9”. Biojodis it is an organic-mineral liquid fertilizer: N 0.85-1.5, P 0.9-1.5, K 0.82-1.5 CaO 0.4-2.0, MgO 0.25-2.0, Fe 0.08-0.2, Mn 0.002-0.05, Cu 0.008-0.01, Zn 0.002-0.01, Co 0.002-0.005, Mo 0.002-0.005, B 0.008-0.02 [%] and I 1.50-2.40 [mg.L-1], pH 7.1-7.8. In experiment carried out there were two forms of Biojodis applied. The first one contained I 1.50- 2.40 [mg.L-1] (1) and the second one with doubled iodine amount i.e. I 3.0 – 4.80 [mg.L-1] (2) . The first spraying (5 L.ha-1 diluted in 600 L.ha-1of water) was applied after 10 -15 % flowers buds being developed and the second one after developed ca 80 % flowers. Biojodis enhanced fruit lets setting and stimulated their remaining on the trees. Fruits marketable yield increased. As compared to control, application of foliar fertilizers containing iodide improved structure of yield toward increase of larger fruits diameter and their uniformity index.

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