ALTERNATE BEARING IN SATSUMA MANDARIN AND THE WAYS OF ITS REDUCTION IN NORTH OF IRAN
In the last decade (1999-2008), methods of reducing alternate bearing of citrus east of Mazandaran was investigated. Most of these methods decrease fruitlet number in on years or increase fruit set and fruitlet number in off years. Investigated methods include: 1) nutritional disorders and their effect on alternate bearing; 2) balanced nutrition based on leaf analysis and yield forecast; 3) foliar application of synthetic auxins in on years; 4) foliar application of sucrose in on years; 5) winter foliar application of urea about two weeks before bud break in off years; 6) urea foliar application before and after harvest in on years. Results showed that balanced nutrition reduced alternate bearing index significantly. Auxins and sucrose reduced sink competition in on years, so fruit size increased in on years. Winter applica¬tion of urea, increased fruit set in off years. Urea application at harvest time almost eliminated the alternate bearing cycle. In fact most treatments adjusted the alternate bearing cycle by reducing number of off years or by increasing average yield in off years therefore decreasing differences between on years and off years. Also most treatments increased fruit average weight and diameter in on years.
Akhlaghi Amiri , N. and Asadi Kangarshahi, A. (2012). ALTERNATE BEARING IN SATSUMA MANDARIN AND THE WAYS OF ITS REDUCTION IN NORTH OF IRAN. Acta Hortic. 928, 291-292
citrus, balanced nutrition, urea, auxin, sucrose