Calcium Polysulfides-Thiosulfate, Ammonium Thiosulfate, and NC-99 Blossom Thinners Impact Fruit Set of Apples, Peaches, and Plums

Esmaeil Fallahi
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Esmaeil Fallahi: Department of Plant Sciences, University of Idaho, USA

Agricultural Research & Technology: Open Access Journal, 2020, vol. 25, issue 1, 14-20

Abstract: Crop load adjustment, using blossom and/or post-bloom thinners is a crucial practice to ensure production of commercially acceptable fruit size and yield efficiency in apples and stone fruit. In a study with two apple, one peach and one plum cultivars, application of calcium polysulfides and thiosulfate mixture (lime sulfur), ammonium thiosulfate (ATS), and NC-99 (Natural-cal), applied during bloom, reduced the fruit set of apples and/or certain stone fruit. In most cases, higher concentrations or double applications of a bloom thinner resulted in more blossom thinning which led into lower fruit set. Double applications of ATS at a rate of 15 mL.L-1 or a single application of this chemical at a rate of 25 mL.L-1 resulted in adequate levels of thinning in Fuji apple. Double applications of ATS at a rate of 25 mL.L-1 resulted in excess thinning on Fuji apple. In Gala apple, a single application of NC-99 at 3% or 6%, with and without refined oil, or double applications of lime sulfur, each time at 5%, significantly reduced fruit set in 2013. In Jonathan apple, applications of ATS at 25 mL.L-1 significantly reduced fruit set and increased fruit size. Application of lime sulfur at 6% with or without refined oil significantly reduced fruit set in Elberta peach. In plums, application of lime sulfur at 6% with 1% refined oil significantly reduced fruit set, while application of this mixture at 3% lime sulfur (3% lime sulfur plus 1% oil) did not affect fruit set.

Keywords: open access; Juniper publishers agriculture open access journals; agriculture peer reviewed journals; sustainable agriculture peer reviewed journals; agriculture research journal; agricultural sciences open access journal; open access journals of agriculture; agriculture journals impact factor; agriculture academic journals; agriculture journals by impact factor; agricultural engineering journals; juniper publishers review (search for similar items in EconPapers)
Date: 2020
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Persistent link: https://EconPapers.repec.org/RePEc:adp:artoaj:v:25:y:2020:i:1:p:14-20

DOI: 10.19080/ARTOAJ.2020.25.556289

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