Influenţa acidului giberelinic GA4+7 asupra fructificării şi calităţii fructelor de măr de soiul Golden Delicious

Abstract

Abstract. The experimental plot is placed in the orchard “Accesal” Ltd. founded in 2010. The study subject of the experience was Golden Delicious apple variety grafted on M 26. The trees were trained as slender spindles. The distance of plantation is 4.0 x 2.0 m. The tested gibberellic acid was GA4+7, product Gerlagib LG. To study the influence of the treatment on fructification and quality of Golden Delicious apple variety, four variants were experimented: 1. Control – no treatment; 2. Gerlagib LG – 300 ml/ha; 3. Gerlagib LG – 400 ml/ha; 4. Gerlagib LG – 500 ml/ha. The trees were sprayed 4 times. The research was conducted during the period of 2016-2017 years. During the research, the following parameters were studied: the amount and average weight of fruits, tree productivity, firmness of fruits, hydrolysis index and russeting of fruits. In the present research work, we demonstrated that Gerlagib LG product may be included in the technologic system to prevent russeting on Golden Delicious apple fruits, and it must be administered in the dose from 300 to 500 ml/ha, depending on the weather conditions. The product can be applied up to 4 times, starting from petal fall stage and continuing with three next treatments at intervals of 7-10 days.

Keywords

• Apple
• Gibberellic acid
• Russeting
• Fruit index
• Yield