Chemical composition of developing and shed fruits of Laxton’s Fortune apple

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Abstract
The trend in mineral composition of the developing fruit was a decline in concentration over the season and the individual elements differed in their patterns of uptake. Potassium and phosphorus entered the fruit at a relatively steady rate after the first 2–3 weeks following full bloom, whereas the major part of the calcium uptake occurred during the first few weeks of fruitlet development. Shed fruits had lower dry matter and mineral contents than attached fruits during the early part of the season, but from late July onwards, when fruit drop was accidental, no differences were detected. Fruit thinning increased fruit dry weight and element content but had little effect on element concentration, with the exception that calcium concentration tended to be higher in thinned fruits at harvest.

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