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ISHS Acta Horticulturae 1299: XXX International Horticultural Congress IHC2018: VII International Symposium on Tropical and Subtropical Fruits, Avocado, II International Symposium on Jackfruit and Other Moraceae and II International Symposium on Date Palm

Research on the effects of foliar urea applications on fruit set and yield in 'Washington Navel' oranges

Authors:   B. Dal, H. Gübbük
Keywords:   low bi-uret urea, foliar fertilization, fruit set, yield, 'Washington Navel'
DOI:   10.17660/ActaHortic.2020.1299.39
Abstract:
Low bi-uret urea treatment on 'Washington Navel' orange trees for six times application and a nontreated control was investigated to find out the effects on fruit set and yield. Low bi-uret urea (1.75%) was sprayed at 0.16 kg pure N per tree with 10 trees per treatment. Tagged leaves were counted at full bloom, small fruit, post-June abscission and at pre-harvest periods. Yield per tree was recorded at harvesting. Urea applications showed positive effects on fruit set. As far as the fruit ratio reaching the harvesting from the June abscission is concerned, application in February produced significantly better fruit set than the untreated control. Our results indicate that foliar application of low bi-uret urea in February resulted in significantly improved yield. Urea application significantly increased the amount of the fruit.

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