结种银杏树在生长发育期,常有未进行疏花疏种或疏花疏种不彻底,银杏出现大量未熟先落现象。据调查,鲁南、苏北银杏产区,在5月中旬至6月上旬出现第1次落种高峰,6月下旬至7月上旬出现第2次落种高峰,每年的落种量约占总结种量的40％～50％,甚至更多。根据银杏栽培经验和有关资料,将银杏落种原因和调整方法总结整理如下,以供参考。 一、银杏落种原因 1.养分供应不足,树体营养失 Ginkgo tree growth in the growth and development, often without flowering sparsely popularized or sparsely popularized species is not complete, ginkgo phenomenon before a large number of unripe. According to the survey, Lunan, Northern Jiangsu ginkgo producing areas, the first peak appeared in mid May to early June, the second peak appeared in late June to early July, the annual drop of about Summarize the amount of 40% to 50%, or even more. According to the experience of ginkgo cultivation and related information, the reasons for ginkgo seeding and adjustment methods are summarized as follows for reference. First, the reasons for the fall of ginkgo 1. Nutrient shortage, tree nutrition loss