Reapplication of bud break promoters in ‘Fuji Suprema’ apple trees

Abstract The aim of this work was to verify the effectiveness of the reapplication of bud break producers on flowering, sprouting and production of ‘Fuji Suprema’ apple trees. The experiment was carried out in an experimental orchard located in the municipality of Caçador, SC, during 2016/2017 to 2019/2020 seasons. Treatments were applied at stages B and C, and those with reapplication, from 7 to 14 days after the first application. Phenology, axillary and terminal bud break, frui set, production per plant and average fruit mass were evaluated. Phenology was advanced in relation to control with the application of bud break promoters. However, treatments applied at stage B provided greater advance in relation to applications at stage C. In axillary and terminal bud break, all treatments were superior to control. In some seasons, the sequential application of bud break promoters increased bud sprouting compared to single application treatment. There is no reduction fruit set in treatments with sequential application in relation to single application. In plant production, sequential applications did not differ from single application. The average fruit mass was not altered by the sequential application of bud break promoters.

摘要：本研究旨在验证破芽促进剂（bud break producers）重复施用对‘富士至尊’（Fuji Suprema）苹果树开花、萌芽及产量的调控效果。试验于2016/2017至2019/2020共4个生长季，在巴西圣卡塔琳娜州（SC）卡沙多尔市（Caçador）的试验果园内开展。试验分别于物候期B与C阶段施药，其中重复施用组于首次施药后7至14天进行二次施药。本研究测定了物候进程、腋芽与顶芽萌芽率、坐果率、单株产量及平均单果质量共5项指标。结果显示，施用破芽促进剂可使物候进程较对照组提前，其中B期施药处理的物候提前幅度显著高于C期施药处理；在腋芽与顶芽萌芽率方面，所有施药处理均显著优于对照组，部分生长季中，破芽促进剂连续施用较单次施用可进一步提升萌芽率；连续施用组的坐果率与单次施用组无显著差异，单株产量方面，连续施用与单次施用处理间无统计学差异，平均单果质量亦不受破芽促进剂连续施用的影响。