Volume 56 Number 3 Article 22
Year 2002 Month 7
Title: Calcium Spray Materials and Fruit Calcium Concentrations Influence Apple Quality
Authors: J.T. Raese and S.R. Drake
Abstract:
Bearing 'Delicious' and 'Golden Delicious' apple trees in three northcentral Washington orchards were
treated with up to 12 calcium (Ca) spray materials over five years to determine their effect on fruit quality.
In most cases, Ca spray materials, with the notable exception of CaSO4, increased Ca concentrations
in the fruit cortex and peel, and reduced the incidence of bitter pit and scald.
Fruit firmness and to a less
er extent titratable acids were frequently enhanced with Ca spray materials, especially CaCl2, but soluble solid concentrations were seldom affected.
In 'Delicious' apples, fruit appearance and to a lesser degree total red skin area and internal browning control were improved with sprays of CaCl2 or Stopit.
None
of the Ca spray materials caused unacceptable russet markings on the fruit, but some Ca spray injury occurred on leaves, especially 'Golden Delicious' with the exception of CaSO4 sprays.
There was also no
apparent affect of Ca sprays on fruit size.
Therefore, certain Ca sprays, especially CaCl2-based materials are advantageous for improving fruit quality of 'Delicious' and 'Golden Delicious' apples.
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