9022: Ergebnisse aus dem Forschungsprojekt über Alternativen zu Schwefelkalk bei der Blütenausdünnung in den Jahren 2004 und 2005 [Results of a Research Project about alternatives to lime sulphur for blossom thinning in 2004 and 2005]

Eis, Birgit (2006) Ergebnisse aus dem Forschungsprojekt über Alternativen zu Schwefelkalk bei der Blütenausdünnung in den Jahren 2004 und 2005 [Results of a Research Project about alternatives to lime sulphur for blossom thinning in 2004 and 2005]. Paper presented at ecofruit - 12th International Conference on Cultivation Technique and Phytopathological Problems in Organic Fruit-Growing, Weinsberg/Germany, 31.1.-2.2.2006; Published in Boos, Markus, Eds. ecofruit - 12th International Conference on Cultivation Technique and Phytopathological Problems in Organic Fruit-Growing: Proceedings to the Conference from 31st January to 2nd February 2006 at Weinsberg/Germany, page pp. 204-212. Fördergemeinschaft Ökologischer Obstbau e.V. (FÖKO), Traubenplatz 5, D-74189 Weinsberg.

Summary

At the LVWO Weinsberg different agents were tested, in 2004 with the apple variety ‘Gala’ and in 2005 with the variety ‘Elstar’, both organically grown. In addition to the thinning effect its influence on yield, fruit quality (size, colour, russetting) and return bloom were investigated. An alternative to lime sulphur at the variety ‘Gala’ might be sunflower oil (thinning effect 42-62 %), but the number of blossom clusters in 2005 was up to 60 % lower than in the lime sulphur plots. In 2005 the variety ‘Elstar’ treated with fish oils also showed good thinning effects (31-42 %), but the percentage of flower buds for 2006 hasn’t been evaluated yet. However, in both years lime sulphur showed good results, too. The research project was financed by the Bundesprogramm Ökologischer Landbau.

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