开甲就是环状剥皮,也叫“(善刂)树”。这是我省沧县、交河、庆云、玉田一代的小枣产区应用已久的增产措施,他们说:“挂枣不挂枣,全凭(善刂)上找”。枣树开甲能够增产的原因,主要是由于环状剥皮后,在一定的时间内,截断了地上部制造的营养物质向下运输 Open armor is a ring-shaped peeling, also known as (“tree”). This is our province Cangxian, cross the river, Qingyun, Yutian generation Jujube production areas have long been applied stimulation measures, they said: “Hanging dates do not hang jujube, the whole (good) to find.” Jujube open armor can increase the production is mainly due to ring-shaped peeling, in a certain period of time, cut off the nutrients produced aboveground transport downward