沙田柚夏季更新修剪对萌芽抽枝的影响

柑橘老果园大冠改小冠技术是农业部2012年重点推介的实用技术之一,沙田柚更新复壮一般在每年的大寒至立春萌芽前进行,而夏季更新复壮正值高温多雨季节,容易引起枝条灼伤、爆皮、枝梢枯死等,因此夏季更新用得比较少。为探索出适合于沙田柚夏季更新修剪以及管理措施,用于指导生产,进行沙田柚老果园夏季更新复壮研究。实验结果表明沙田柚夏季更新修剪可比第二年春季再进行更新修剪的多抽生2-3次梢;采用主枝更新的效果最好,其次是露骨更新和轮换更新。

The impact of Shatian pomelo summer renewal pruning on germination and branch sprouting

Old citrus orchard big-crown-to-small-crown technology is one of practical technologies rec- ommended by National MOA in 2012. The renewal and rejuvenation of Shatian pomelo are commonly oc- cured in the period from Great Cold to Beginning of spring preceding germination each year. But the re- newal and rejuvenation in summer will encounter high temperature and rainy season, when the branch scorching, blistering, and topmost withering are easily caused, so this technology is seldom used. In or- der to explore measures suitable to summer renewal pruning and management for guiding production, a study of above-mentioned technology was conducted. The results of study show that the trees with re- newal pruning in summer could have 2-3 times of branch sprouting more than those of renewal pruning in Spring next year,where the main branch renewal has the best effect, secondly, barefaced renewal and rotation renewal.