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Effect of the concentration of mineral constituents in apples on their postharvest quality and storage performance. II. Relations between the concentration of mineral constituents in apples and some factors determining their quality

Jan Ben

Department of Pomology
Faculty of Horticulture, Agricultural University
29 Listopada 54, 31-425 Kraków, Poland

Relations between N, P, K, Ca, and Mg concentration in Jonagold apples and the firmness of their flesh, the content of total sugars, total acids, soluble solids, and dry matter were investigated. The analysed fruits were harvested in 11 orchards situated in southern Poland.

Nitrogen concentration was negatively correlated with fruit firmness and the content of sugar, acids, extract, and dry matter, while phosphorus concentration was positively correlated with the firmness of apples and negatively with the remaining investigated constituents. A high positive correlation occurred between calcium concentration and the firmness of fruit (r=0.82) and a negative one between Ca and acidity ( r=-0.62). The K/Ca and N/Ca ratios were negatively correlated with the firmness of apples (-0.58 and -0.30, respectively), the N/Ca ratio being additionally correlated with the dry matter content (r=-071).

Ben J., 1997. Effect of the concentration of mineral constituents in apples on their posthavest quality and storage performance. II. Relations between the concentration of mineral constituents in apples and some factors determining their quality. Folia Horticulturae 9/1: 51-57.