Abstract

BARRETO, Caroline Farias et al. Potassium fertilization on quality of peaches. Rev. de Ciências Agrárias [online]. 2020, vol.43, n.1, pp.145-158.  Epub Dec 13, 2019. ISSN 0871-018X.  https://doi.org/10.19084/rca.17859.

For stone fruit the potassium (K) is related to fruit quality. The objective of this work was to evaluate different amount of potassium fertilization in the physical-chemical characteristics and bioactive compounds of ‘Esmeralda’ peach fruits. The experiment was carried out in a commercial orchard in the municipality of Morro Redondo, Rio Grande do Sul, Brazil, between the seasons of 2014 and 2017. The potassium doses applied were 0, 40, 80, 120 and 160 Kg K2O ha-1. It was evaluated: pulp color, peel and pulp firmness, soluble solids, pH, titratable acidity, SS/AT, total phenolic compounds, total carotenoids and antioxidant activity. The increase in K doses reduced the phenolic compounds content and the antioxidant activity in the peaches in the same harvest Fruit quality parameters, such as titratable acidity and firmness of the pulp did not show changes with the potassium fertilization of the peach trees in the four harvests cycles evaluated. However, soluble solids, SS/AT, chroma, °Hue, peel firmness and bioactive compounds are influenced by the amount of K, but also depend on the climatic conditions and the crop under analysis.

Keywords : physical-chemical; bioactive compounds; plant nutrition.

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