Document Type : Full Paper
Authors
1
Department of Horticultural Science, Faculty of Agriculture, Shahid Chamran University of Ahvaz,, Ahvaz,, Iran
2
Department of Horticultural Science, Faculty of Agriculture. Shahid Chamran University of Ahvaz, ahvaz, Iran
3
Department of Horticultural Science, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran
Abstract
The N plays an important role in nutrition management in the citrus tree for uniform and quality production. Considering the role of nitrogen in vegetative and reproductive growth and yield increase, as well as the relationship between hormones to flower induction and fruit set in other plant species. An experiment was conducted to investigate the effect of different levels of urea (0, 0.75%, 1.5%), and different times of urea foliar application (Dec 22, Jan 5, Jan 20) on ABA, IAA, GA3, flowering density and nitrogen in Kinnow mandarin tree as factorial basis in a randomized complete block design with three replications. Sampling was done from leaves and nods at 1, 3 and 5 weeks after spraying. The results of this study showed that after foliar application, the highest leaf and bud leaf nitrogen content obtained from trees sprayed with 1.5% concentration of urea on Jan 5 in off year. The highest leaf and node GA3 content obtained from trees control in on year. The highest amounts of ABA of leaves were reported in 0.75% urea concentration on the 20th January. The highest leaf and node IAA content obtained from plants sprayed 1.5% concentration of urea in off year. Also, different concentrations of urea increased the number of flowers, and the highest effect was observed on the highest urea concentration (1.5%).
Keywords
Main Subjects
)