Study on Effective Methods for Reducing the Alternate Bearing in Golden Delicious Apple Cultivar

The effects of nitrogen application (Urea, ۴۶% N), fruit thinning and ringing on flower bud formation of “Golden Delicious” apple trees were studied in two independent ex-periments in ۱۹۹۲ and ۱۹۹۳. In the first experiment, the effects of nitrogen application and fruit thinning at levels of ۰, ۲۵, ۵۰ and ۷۵% on flower bud formation were studied in full-bearing trees. In the second experiment, the effects of nitrogen application and ring-ing on flower bud formation were studied in poor-bearing trees. The results showed that full-bearing fertilized and unfertilized apple trees produced almost the same flower buds, but the thinning treatments at levels of ۵۰ and ۷۵% produced higher flower bud forma-tion as compared with controls ( P ۰. ۰ ۱). For poor-bearing trees, both ringing and ap-plication of nitrogen together or alone showed an increase in flower bud formation in the following year compared to the controls (P ۰. ۰ ۵ ).

کلیدواژه ها:

Alternate bearing ، Apple ، Full-bearing ، Poor-bearing ، Ringing ، thinning