Influence of roofing systems and field production on the yield stability of organically grown strawberries.

摘要

The influence of two different roofing systems (a closed tunnel and a rain shelter) in comparison with an open field was analysed with respect to the yield, behaviour of the fruit during storage at room temperature and fruit quality such as fruit firmness, firmness of fruit skin and sugar- and acid-contents of strawberries. Results from 2009 and 2010 showed higher marketable yields and lower unmarketable yields of the fruit in the closed tunnel in comparison with the rain shelter and the open field. However, the differences between the cultivars were strong. In 2009, the shelf life of the fruit from the open field was shorter in comparison with the fruit grown under the rain shelter and in the closed tunnel. These results were not confirmed in 2010, where no significant differences were detected. There were cultivar-related interactions for fruit firmness and firmness of fruit skin. The type of roofing system showed a particularly strong influence on the sugar and titratable acid content. These differences between the cultivars were significant in 2009. At the end of the project, appropriate recommendations for the more secure and profitable production method will be provided for producers, so the range of regional organic strawberries on offer can be extended.