Physiological disorders during fruit storage are common, leading to remarkable losses of marketable yield, could be strongly affected by the mineral composition of fruits at harvest. The present study was conducted during three years and was based on experimental data obtained from a fertilizer trial arranged into completely randomized blocks, with three replications, installed in an orchard in the Portuguese Region of Bairrada. This experiment was established in order to evaluate the influence of nitrogen and potassium fertilization on the yield and fruit mineral composition of Actinidia deliciosa cv. Hayward. Three levels of nitrogen (30, 60, and 90 kg.ha-1 ,N) and four levels of potassium (0, 45, 90 and 135 kg.ha-1 ,K 2 O) were used, arranged into 12 experimental treatments. Since 2004, nitrogen and potassium was applied annualy. Total yield and its distribution according to fruit size from each plot: [65-75g[, [75-85g[, [85-105g[ and >105g was evaluated. A sample of 16 fruits of each fruit size was taken from each plot and analysed (N,
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