Abstract
Generally, when nitrogen effects on fruit properties are assessed, different samples harvested at different maturity stages are assayed. This method makes it difficult to investigate the direct effects of fertilization on the different quality parameters without the influence of the ripening stage. In this piece of work, the effects of three levels of nitrogen fertilization (0, 60 and 120kg/ha) on polyphenol oxidase (PPO) activity and consistency of peach fruits at the same maturity stage were studied. The results showed that nitrogen application (regardless the dose) had a direct effect on the studied parameters, causing an increase of PPO activity and also an increase of fruit consistency. However, no significant differences were found between the application of 60 and 120kgN/ha. This enhanced activity of the enzyme may represent a problem in peach postharvest handling and processing.
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