低产银杏树丰产技术

High yield techniques for gingkgoes with low yield

通过几十年的调查研究发现 ,银杏产量低而不稳定的主要原因是立地条件差、管理粗放、雄株不足和授粉不良。 70年代以来通过推广施肥、老树更新复壮、人工辅助授粉和高接雄花枝等技术 ,使临安市银杏年均产量由 70年代的 44 4t上升到 80年代的 85 2t,产量的年变异系数也相应下降 ,实现了丰产稳产目标。表 3参

Dozens of years of investigation showed that the low and unstable yield of gingkoes was caused mainly by the poor site condition,careless management,insufficient male stalks,and improper pollination.Since the 1970s,via such techniques as delivery of fertilizer applying,pruning and regeneration of old trees,aftificial pollination,and graft of male-flower twigs high up on the tree,the gingko yield has increased from 44 4 t in 1970s to 85 2 t in 1980’s .The variation coefficients have likewise decreased,demonstrating a yield both high and stable.[KH2D]