Influenţa giberilinei GA4+7 asupra calității fructelor de măr

Abstract

The experimental plot is placed in the orchard “Dacfruct” Ltd. founded in 2006. The research was conducted during the period of 2013 year. The study subject was Golden Delicious apple variety grafted on M 9. The distance of plantation is 3.5 x 1.2 m. The tested gibberellin was GA4+7, (Gerlagib LG). To study russeting of the apple fruits were experimented the following variants: 1. Control – no treatment; 2. Gerlagib LG - 400 mg/l; 3. Gerlagib LG - 500 mg/l. The trees were sprayed 4 times. It was studied the average of fruits, tree production, firmness of fruits, hydrolysis index and russeting of fruits. It was established that, Gerlagib LG may be included in the system to prevent russeting on apple fruits, the dose 500 mg/l, applied up to 4 times by treatment. First treatment performed starting from petal fall stage, and the next 3 treatments 7-10 days after previous.