Effect of Putrescine, GA3, 2, 4-D, and Calcium on Extending Harvest Season of Navel Orange

Marzouk, Hend A; Kassem, Hassan A

doi:10.21608/asejaiqjsae.2010.2311

Effect of Putrescine, GA3, 2, 4-D, and Calcium on Extending Harvest Season of Navel Orange

Document Type : Original Article

Authors

Hend A Marzouk ¹
Hassan A Kassem ²

¹ Department of Pomology, Faculty of Agriculture, Alexandria University, Alexandria, Egypt,

² Department of Plant Production, College of Food and Agricultural sciences, King Saud University, Kingdom of Saudi Arabia

10.21608/asejaiqjsae.2010.2311

Abstract

The present study was conducted in 2007/2008 and 2008/2009 seasons in order to extend harvest season and maintain fruit quality for better marketability of Washington navel oranges growing in clay soil by preharvest foliar sprays (at color break stage) with GA3, 2,4-D, putrescine and calcium either alone or in combinations. Trees were harvested at mid- February (late in the season). All sprayed substances delayed fruit softening, peel ageing and fruit color break and decreased creasing and preharvest fruit drop. Also, fruit TSS, sugars and V.C. contents were increased. The treatments had positive influence on extending harvest season without any deterioration in fruit characteristics. In general, spraying the different substances in combinations gave better results, especially for putrescine and 2,4-D.

Main Subjects