Nutritional status and quality of Sampion apples depending rootstock
2004
Andziak, J. | Tomala, K., E-mail: [email protected]. waw.pl | Sadowski, A. | Dziuban, R. (Szkola Glowna Gospodarstwa Wiejskiego, Warszawa (Poland). Katedra Sadownictwa i Przyrodniczych Podstaw Ogrodnictwa)
In the years 1998-01 samples of leaves, fruitlets and fruits of Sampion were taken from trees on six rootstocks (M.9 EMLA, M.9 T337, M.9 T339, P 22, Nr 47 and P 14). They were analysed for potassium and calcium content. For evaluation of storage ability, 24 kg fruits of uniform size were taken from each replication. After 5 months in common cold storage the incidence of diseases and disorders were determined. Leaf Ca concentration was the highest from trees on M.9 T337 rootstock. Fruitlets and fruit from trees on P 14 generally had a high K concentration. On the other hand, fruits from trees on M.9 T337 and P 22 generally had a low K concentration. Rootstocks affected storability of apples and this was related to the effect of rootstocks on fruit K:Ca ratio. Bitter pit was determined in 66 percent by K and in 5 percent by Ca concentration in the fruits. The K:Ca ratio in fruit was the factor determining bitter pit in 83 percent. The results suggest that the K:Ca ratio, irrespective of the organ analysed, may be used for further improvement of bitter pit prediction
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