Folia Horticulturae

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Response of Jonagold apples to various doses of nitrogen fertilizers in the orchard. II. Effect of increasing N doses on certain traits of Jonagold apples before and after storage

Jan Błaszczyk, Jan Ben

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

The effect of different levels of nitrogen nutrition on some properties of apples following harvest and after storage was investigated. The effect on flesh firmness depended both upon the vegetation period and the applied doses of nitrogen. The content of extract significntly changed in the successive years of the investigation, though in 1994 only its significant reduction was observed after harvest with the nitrogen dose of 120 kg N ha-1. No effect of nitrogen on the content of malic acid was assessed at harvest time. During storage a faster degradation of acids usually occurred in fruit from plots fertilized with 120 kg N ha-1. In all the years apples fertilized with the highest nitrogen doses showed a greater intensity of the green colour of the skin than the control fruits of those from plots with a lower nutrition level. The degradation of chlorophyll pigments was very slow during storage. In 1993 and 1994 the flushed area of the apple surface was significantly diminished with the highest dose of nitrogen in relation to control plots and those fertilized with the dose of 60 kg N ha-1.

Błaszczyk J., Ben J., 1996. Response of Jonagold apples to various doses of nitrogen fertilizers in the orchard. II. Effect of increasing N doses on certain traits of Jonagold apples before and after storage. Folia Horticulturae 8/2: 31-39.