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Barakat, M., El-Ezaby, A., Salem, S., El-Azaze, A. (2007). EFFECT OF PREHARVEST FOLIAR SPRAY WITH GIBBERELLIC ACID AND CALCIUM ON YIELD AND QUALITY OF ON -TREE STORED FRUITS OF NAVEL ORANGE.. Journal of Plant Production, 32(3), 2095-2103. doi: 10.21608/jpp.2007.206725
M. R. Barakat; A. El-Ezaby; S. E. Salem; A. M. El-Azaze. "EFFECT OF PREHARVEST FOLIAR SPRAY WITH GIBBERELLIC ACID AND CALCIUM ON YIELD AND QUALITY OF ON -TREE STORED FRUITS OF NAVEL ORANGE.". Journal of Plant Production, 32, 3, 2007, 2095-2103. doi: 10.21608/jpp.2007.206725
Barakat, M., El-Ezaby, A., Salem, S., El-Azaze, A. (2007). 'EFFECT OF PREHARVEST FOLIAR SPRAY WITH GIBBERELLIC ACID AND CALCIUM ON YIELD AND QUALITY OF ON -TREE STORED FRUITS OF NAVEL ORANGE.', Journal of Plant Production, 32(3), pp. 2095-2103. doi: 10.21608/jpp.2007.206725
Barakat, M., El-Ezaby, A., Salem, S., El-Azaze, A. EFFECT OF PREHARVEST FOLIAR SPRAY WITH GIBBERELLIC ACID AND CALCIUM ON YIELD AND QUALITY OF ON -TREE STORED FRUITS OF NAVEL ORANGE.. Journal of Plant Production, 2007; 32(3): 2095-2103. doi: 10.21608/jpp.2007.206725

EFFECT OF PREHARVEST FOLIAR SPRAY WITH GIBBERELLIC ACID AND CALCIUM ON YIELD AND QUALITY OF ON -TREE STORED FRUITS OF NAVEL ORANGE.

Article 15, Volume 32, Issue 3, March 2007, Page 2095-2103  XML PDF (460.16 K)
Document Type: Original Article
DOI: 10.21608/jpp.2007.206725
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Authors
M. R. Barakat1; A. El-Ezaby1; S. E. Salem2; A. M. El-Azaze2
1Pomology Department, Faculty of Agriculture, Cairo University
2Horticulture Research Institute. Agriculture Research Center, Giza
Abstract
This experiment was carried out during two successive seasons (2002-2003 and 2003-2004) on Washington navel orange trees 30 year old grafted on sour orange grown in a private orchard in Elkaliobia Governorate to explore the possible effects of foliar application of gibberellic acid at 10, 15, 20ppm and calcium chloride at 1% and2% on the quality of on-tree-stored fruits of Washington navel orange.  Treatments were applied at fruit color break as whole tree sprays .Fruits were harvested at four dates January, February, March, and April. Yield and fruit quality parameters were recorded.
Gibberellic acid at 20ppm significantly decreased the reduction in fruit weight, fruit drop and increased juice weight percentage, juice acidity, ascorbic acid. Nevertheless GA3 at all the tested concentrations minimized the peel thickness in the last harvesting date and decreased juice T.S.S
Calcium chloride at 2%caused significant increases in fruit weight, juice weight percentage, juice acidity, ascorbic acid  and insignificant increase in peel thickness while it significantly decreased number of fruit dropped and juice T.S.S
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