Yield Quality in some Taxona of the Genus Rubus Depending on the Cultivation Technology

摘要

The purpose of this research project was to determine how mulching, specific harvesting times, and the differing weather conditions of the years involved affected the biochemical content of two Rubus family species: the raspberry (Rubus idaeus L.) 'Tomo' and the blackberry (Rubus fruticosus coll.) 'Agawam'. The appropriate data were recorded in the course of the years 2001-2004. The 'Tomo' and 'Agawam' fruit weight was not significantly influenced by cultivation technology, but was influenced by harvesting time and the weather conditions of the particular year involved. The fruit dry matter (DM) was directly related to the berries' harvesting time. The soluble solids content (SSC) in the raspberry fruits was 9.9-13.3 % and 8.9-16.0 % in the blackberries. The raspberry fruits' SSC was significantly influenced by cultivation technology: the SSC was higher in berries grown without mulch. The ascorbic acid content (AAC) varied over the years, and depended mostly on the particular species. The raspberryfruits' AAC was significantly influenced by cultivation technology: the AAC was higher in berries grown without mulch. The blackberry fruits' AAC was also influenced by the harvesting time, being higher in berries from the last harvesting. The differingyearly wheather conditions had a greater effect on the blackberry fruits' titratable acids (TA) content. The results indicated that fruit weight and biochemical content were primarily influenced by the differing weather conditions of the various years involved. The berries, for instance, contained more DM and soluble solids, and less TA in 2002. Cultivation technology had significant influence only on the raspberry fruits' AAC and SSC. Harvesting time had an impact on both the raspberry and the blackberry fruit weight and DM content, but the fruit SSC, AAC, and TA were affected only in the blackberry.