Apple (Malus domestica Borkh.) is the most widespread fruit species in our area, whose fruits have been considered one of the most interesting throughout history, and until today this species become the most important in Slovenia. In recent years, the almost complete oversaturation of the market has led to the desire and demand of buyers for the highest quality fruit of the first class. In order to achieve the best possible fruit quality, we tested and analysed the performance of the foliar fertiliser Phostrade Ca, which contains phosphorus, nitrogen and calcium, in the orchard in Bizeljsko. The trial was conducted in a 9-year-old orchard with apple trees of the 'Gala' cultivar, where Phostrade Ca was applied as a foliar fertiliser three times before harvest. At harvest, fruit from 20 experimental and 20 control trees were classified into 1st and 2nd quality classes. We measured fruit dimensions, ground and cover colour parameters, soluble solids content, titratable acids, and flesh firmness. It was found that the foliar fertiliser Phostrade Ca resulted in a higher yield per tree (17.0 kg/tree, which is 2.5 kg/tree more than the control) and per hectare (8 t/ha more than the control), and that the percentage of fruit of the first quality class was higher when the trees were treated with Phostrade Ca. Soluble solids and titratable acid contents were higher and flesh firmness was lower when treated with Phostrade Ca. The fruits of the Phostrade Ca treatment were dark red in colour compared to the control fruits.
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