ISHS Acta Horticulturae 395: Dormancy and the related Problems of Deciduous Fruit Trees
EFFECT OF MINERAL OIL AND HYDROGEN CYANAMIDE CONCENTRATIONS ON APPLE DORMANCY, CV. GALA. |
| Authors: | J.L. Petri, H. Stuker |
| Keywords: | Break dormancy, Apple, Mineral oil, Hydrogen cyanamide |
| Abstract:
In Southern Brazil, 'Gala' apple does not receive sufficient cold to satisfy it's chilling requirement. Hydrogen cyanamide (HC) is used as a chemical treatment to force the insufficiently chilled 'Gala' buds. The purpose of this study was to compare the effect, during 4 years (1988–91), of four concentrations of HC (0.5; 1.0; 1.5, and 2.0%) applied separately, and four concentrations (0.25; 0.5; 0.75, and 1.0%) of HC in combination with 4 concentrations of mineral oil (MO) on rest release of insufficiently chilled 'Gala'apple buds. Each year data were taken on date of bud break and full bloom, percent of lateral and terminal bud break, number of flower clusters per tree, total yield, mean fruit weight, number of spurs per meter of branch length, and pollen grain germination. Compared to the control, trees treated with HC applied alone or in combination with MO had an increased percentage of lateral and terminal bud break as well as number of flower clusters per tree that bloomed. Lateral and terminal bud break as well as that of flower buds was not improved with increases in either the MO or HC concentrations. However, an increase in yield/tree occurred at the 2% MO and 0.25% HC treatments. | |
Download Adobe Acrobat Reader (free software to read PDF files) | |
