FRUIT SET RESPONSES TO GIBBERELLIC ACID, NITROGEN AND GIRDLING ON ´HASS´ AVOCADO
The objectives of this study were to increase the initial fruit set with applications of GA3+N+girdling; reduce the presence of floral abnormalities in winter bloom (Nov-Dec, 2003-2004), and evaluate the effect of the treatments on the quality of developing fruit corresponding to the winter-bloom of the previous year (2002-2003). GA3 and N were applied to inflorescences at stage 8 of development (cauliflower stage, November) and girdling was performed in full bloom (January 3 2004). Flower abnormalities and initial fruit set were measured in January and February 2004 (0.5 cm diameter fruits), respectively. No interactions were recorded during initial fruit set; however, N and girdling increased fruit set by 49.6% and 79.8%, respectively; whereas the GA3 application had no effect whatsoever. In spite of the treatments affecting the numbers in each evaluated floral structure, these differences were not reflected on the total percentage of abnormalities. Fruit weight increased with treatments of N (225 g), girdling (228 g), GA3+girdling (238 g) and N+GA3+girdling (254 g). Firmness and weight loss were not affected by the treatments, except for N+girdling, which favored weight loss (16%). The color components were differentially affected by the treatments; N, N+GA3, and N + girdling treatments reduced L; while GA3 maintained C and N + GA3 delayed a decrease in hue angle values.
Espindola-Barquera, M.C., Cano-Medrano, R. and Rodriguez-Alcazar, J. (2006). FRUIT SET RESPONSES TO GIBBERELLIC ACID, NITROGEN AND GIRDLING ON ´HASS´ AVOCADO . Acta Hortic. 727, 409-414
Persea americana Mill, winter bloom, floral abnormalities, weight loss, firmness, color components