Folia Horticulturae

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Suitability of infiltration with magnesium chloride in prognosing storage ability of apples

Cezary Piestrzeniewicz, Kazimierz Tomala

Department of Pomology and Basic Natural Sciences in Horticulture
Warsaw Agricultural University
Nowoursynowska 166, 02-787 Warszawa, Poland

Fruits of two apple cultivars ‘Jonagold’ and ‘©ampion’ from, respectively, 20-22 and 14-16 commercial orchards in Central Poland were analysed for mineral elements from 1994-1997. Additional apple samples were infiltrated with magnesium chloride solution, and following 7 days of storage at 20°C, bitter pit-like symptoms were recorded. For evaluation of storage quality, representative fruits were kept at 0-1°C for 6 months.

The number of bitter pit-like symptoms provoked by infiltration was positively correlated with K, Mg, and Mn concentration as well as K:Ca and Mg:Ca ratio in fruits. However, it was negatively correlated with Ca fruit concentration.

Among physiological disorders bitter pit prevailed. The number of bitter pit-like spots was positively correlated with true bitter pit in apples, and negatively correlated with the percentage of sound fruits of both cultivars. These results indicate that the number of bitter pit-like symptoms may be valuable in the assessment of nutritional state and storage capacity of fruits of these cultivars.

Piestrzeniewicz C., Tomala K., 2001. Suitability of infiltration with magnesium chloride in prognosing storage ability of apples. Folia Horticulturae 13/2: 103-110.