This study was carried out during two successive seasons to improve vegetative growth, nutritional status, productivity and fruit quality of Curtis pecan cultivar.
The results of two seasons indicated that the spray pecan trees with Dorcy 50 (Hydrogen Cyanamid) at 2%, 4% or 6% in December induced bud opening earlier than untreated trees. The same treatments gave the highest values from bud burst percentage compared with untreated trees.
The trees were sprayed with Dorcy 50 at 4% + Borax at 2% + Zinc sulphate 2% had significantly higher shoot length, diameter, number of leaves per shoot and leaflet area as compared with the other treatments. All treatments under study increased pollen grains viability, fruit set, fruit retention % and early of fruit set and harvest date and reduced fruit drop% as compared with untreated trees (control). The trees were sprayed with Dorcy 50 + Borax + Zinc sulphate with any concentration gave high values from all yield indicators i.e., fruit set%, fruit retention% and yield (Kg/tree) and improve the nutritional status and fruit quality.
From this study strongly admit the possibility of spraying Curtis pecan trees with hydrogen cyanamid at 4% during the last week of December for bud opining earliness and increase bud burst percentage. Then spray the same trees with Borax at 2% + Zinc sulphate at 2% in the full bloom stage to increase the productivity and improve fruit quality.