Effects of pruning, girdling method on growth, yield and quality of TN01 jujube variety in Ninh Thuan province

Abstract

Research on the effects of pruning and girdling method on the growth, yield and quality of TN01 jujube variety in Ninh Thuan province was conducted on a 6-year-old TN01 jujube orchard which is planted in the experimental area of the Nha Ho Research Institute for Cotton and Agriculture Development in 2 seasons: Summer - Autumn and Winter - Spring in the years 2020 - 2022. The pruning experiment included 4 treatments: Control without pruning, pruning to leave 4 branches, pruning to leave 6 branches and pruning to leave 8 branches. The girdling experiment included 4 treatments: Control without girdling, stem girdling, girdling all first - level branch and girdling leaving first level 1 branch. The experiments were arranged in a randomized complete block design with one factor, 3 repetitions. The results showed that pruning experiment had an impact on the growth, yield and fruit quality of TN01 variety. The pruning treatments all increased the fruit set rate, fruit weight, density, fruit yield, and total soluble solids (TSS) of fruit compared to the control treatment without pruning. In particular, the pruning treatment that retained 6 branches gave the highest efficiency, the fruit had an average weight of 81.2 g/fruit, the yield was 41.64 tons/ha, and the TSS was 12.1^oBrix. The girdling experiment also showed that the fruit setting rate 7.0%, fruit density 67.3 fruits/m² and yield 46.39 tons/ha were much higher than the control. The girdling treatments had lower fruit size and TSS than the control but there was no significant difference.