الفهرس 
Growth stages of pecan budsOnly 14 pages are availabe for public view
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Abstract
The study was conducted in two main experiments during the two seasons 2006 & 2007 in an attempt to alleviate the problem of low crop of pecan trees in Egypt. Trees of 31-years-old of five pecan cultivars (Cherokee, Desirable, Choctaw, CapeFear and Graking) were chosen for this study. In the first experiment, hydrogen cyanamide ”Dormex” 3%, potassium nitrate 5%, urea 10% and water (control) were applied to one-year-old shoots of the trees of the above mentioned cultivars 4 weeks before normal bud break. In the second experiment, complete bagged diallel crosses in addition to self pollination were made for all cultivars under study.
Conclusively, Dormex and potasmium nitrate were significantly effective for enhancing bud burst activity of pecan. Spraying potassium nitrate or Dormex on pecan shoots resulted in the highest percentage of opened flower buds. They further enhanced the earlier opening of female flowers of all cultivars under study by two weeks as compared to control trees in the two seasons. Application of potassium nitrate or Dormex could synchronize time of full bloom of male and female flowers within each cultivar. Cross-pollination is essential for fruiting of pecan trees. Using Choctaw pollens was the best for pollination of all cultivars under study. It was followed by pollination with Desirable pollens; meanwhile pollination with Graking or Cape Fear pollens produced the least significant fruit set.