在柑桔栽培的北缘地区或向北推移的栽培中,生产上最关键的问题是桔树的安全越冬问题,而以苗期的安全越冬更为突出。 提高嫁接高度是柑桔苗期抗寒栽培的措施之一。我国古代早有高接的历史,远在南宋淳熙五年(1178年)韩彦直的《桔录》(卷下)中就有记载:“……遇春月乃接。取诸柑之佳与桔之美者。经年向阳之枝以为贴。去地尺余。(纟留)锯截之。剔其皮。两枝对接。……”明确指出嫁接高度是离地尺余。吴县洞庭山的广大群众也素有高接的习惯,《太湖洞庭山果树》写 In the cultivation of the north edge of citrus or northward cultivation in cultivation, the production of the most critical issue is the winter overwintering orange trees, but the winter seedling more prominent winter. Raising the grafting height is one of the measures of cold-resistant cultivation of citrus seedlings. In ancient China, there was a long history of high connection. It was recorded in “Orange Record” (volume below) by Han Yan straight in the Five Years of Chun Xi (1178 BC) in the Southern Song Dynasty: “...... The beauty of the orange. After years of sticks to the sun. To go to the foot Yu. (纟 stay) sawing cut. Pick their leather. Two docking ...... ”Clearly point out that the graft height is the foot of the land. The vast masses of Dongting Mountain in Wuxian County are also well-known for taking the habit of writing “Dongting Mountain Fruit Tree in Taihu Lake.”