Abstract
Grapes are very appreciated as a functional food due to the high content of bioactive compounds, such as polyphenols and anthocyanins, important for human health. These properties can be improved through plant nutrition management, especially by nitrogen (N). This work aimed to evaluate the effect of mineral and organic nitrogen fertilization on the postharvest quality of Isabel Precoce grape in the Brazilian semiarid conditions. The design was randomized blocks in double factorial 5 x 2, with six blocks and three plants per block. The grapevines were fertilized with five different mineral N concentrations (0, 30, 60, 90 and 120 kg ha−1 N), in combination or not with organic fertilization. The content of soluble solids, titratable acidity, pH, taste index and contents of total soluble sugars, reducing sugars, anthocyanins and polyphenols were evaluated during the 2015/2016 crop seasons. Organic fertilization with up to 90 kg ha−1 N, grapes have higher contents of soluble solids (17°Brix), total soluble sugars and reducing sugars, soluble solids content/titratable acidity ratio, and pH. High polyphenol and anthocyanin contents were obtained mineral N fertilization (up to 60 kg ha−1 N) not-with organic fertilization. Organic fertilization in combination or not with mineral N improves the organoleptic properties of grapes.
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