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选择尿素、钙镁磷肥、硫酸钾、硫酸铜、硫酸锌、硼酸为基本成分 ,以不同浓度按均匀设计法组成不同配方 ,对银杏嫁接苗定植后第 2年的植株进行施肥试验。测量植株在不同时期的生长量及计算年总生长量 ;每隔 1个月采叶样分析营养成分 ;初步确定银杏幼苗的施肥模式为 :尿素 30克 /株～ 6 0克 /株 ,钙镁磷肥 4 50克 /株～ 12 0 0克 /株 ,硫酸钾 2 0 0克 /株～ 32 0克 /株 ,硫酸铜 1.5克 /株～ 4 .5克 /株 ,硫酸锌 1.0克 /株～ 4 .5克 /株 ,硼酸 3.5克 /株～ 4 .0克 /株 ;施肥时间在每年的 6月份前比较合适。
The urea, calcium magnesium phosphate, potassium sulfate, copper sulfate, zinc sulfate and boric acid were selected as the basic components. Different formulations were prepared by uniform design with different concentrations. The fertilization experiment was conducted on the second year after the grafted ginkgo seedlings were planted. The growth of plants at different periods was measured and the annual total growth was calculated. The leaf nutrients were analyzed every other month. The fertilization patterns of ginkgo seedlings were preliminarily determined as urea 30 g / plant ~ 60 g / plant, calcium magnesium Phosphate 4 50 g / plant ~ 1200 g / plant, potassium sulfate 200 g / plant ~ 320 g / plant, copper sulfate 1.5 g / plant ~ 4.5 g / plant, zinc sulfate 1.0 g / plant ~ 4 .5 g / plant, boric acid 3.5 g / plant ~ 4.0 g / plant; fertilization time in June each year before the more appropriate.