effect on the sum of sugars (only in 2010) and acids. In both years,
apples from the non-fertilised plots tended to accumulate relatively
high level of malic acid (on average 7.40 mg/g of fresh weight) and,
consequently, of total organic acids (7.71 mg/g), whereas an
opposite trendwas observed for the organic treatment OF3, with an
average malic and total acids content of 6.44 mg/g and 6.74 mg/g,
respectively. Other effects of fertilisation treatments on organic
acids and sugars were not consistent across the two harvest years.