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yu bi he tao yuan cun zai de wen ti ji guan li ji shu
Author(s): 
Pages: 60
Year: Issue:  1
Journal: Deciduous Fruits

Abstract: 近年来核桃大多密植建园,很多核桃园刚进入盛果期就出现郁闭,严重影响了核桃的产量和品质. 核桃郁闭园存在的问题:①光照恶化.株行间及冠内枝条交叉重叠,光照条件恶化.②园相不整齐.生长势较强的树为争光争肥,侵占通风透光带和相邻核桃树的生长空间,使树木个体间树冠差异较大,管理技术复杂化.③树体结构不合理.树体营养生长旺盛,上层及外围枝头增多,下部和内膛光照不足,缺乏营养,叶薄色淡,枝梢细弱.严重者下部和内膛枝组大量枯死,主枝后部光秃,结果部位外移.④病虫害发生严重.枝稠叶密,病虫害防治困难,日灼、腐烂病和炭疽病以及举肢蛾等病虫害难以控制.⑤田间管理不便.因枝条交叉、主枝冗长下垂,结果部位集中于外围,管理困难.
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