تاثير ارتفاع گلدان و زمان برداشت بر ميزان آلبينيسم توت فرنگي در كشت عمودي بدون خاك

Pot Level Influences on Fruit Albinism by Strawberry in Soilless Culture

To determine the effect of pot level and nutrient leaching on albinism disorder in strawberry (Fragaria ananassa Duch cv ʹCarnaroso") cultivated in perlite substrate an experiment was conducted in 2006. Yield wasdetermined three times (January-February, March-April and MayJune). The results indicated that plants located in an upper position showed more albinism (40.42%) which could be related to nitrogen and potassium leaching as well as a decrease in light intensity. Albinism fruits had higher nitrogen (1.4 mg/g) and potassium (2.14 mg/g) and lower calcium (0.13%) contents, the ratio of N/Ca and KlCa being higher as compared with those in the normal fruits. Former plants fruit were smaller resulting in lower yield. Early fruits (January-February) showed the most albinism and the highest nitrogen (1.29 mg/g) as well as potassium (2.05 mg/g) contents. Albinism was decreased (19.55%) in the storage organs at the end of harvesting season because of decrease in nitrogen and potassium. The interaction effect between harvesting time and pot level was to be not significant.