葡萄植株春季受伤后,常从伤口处向外流出透明的汁液,这种现象叫“伤流”。葡萄伤流一般出现在春季树液开始流动(3月中旬)至萌芽展叶约1个多月的时间内。葡萄伤流是由根压(根压是由根系本身的代谢活动而产生的从土壤中吸取水分并向上压送水的力量)引起的,并和地温有密切关系。春 Grape plants spring injury, often out of the wound out of transparent juice, this phenomenon is called “bleeding.” Grape injury generally occurs in the spring when the sap begins to flow (mid-March) to budding leaves for about 1 month or so. Grape injury is caused by root pressure (root pressure is the root of the metabolic activity of its own from the soil to absorb water and pressure up the pressure of water) and caused, and is closely related to the ground temperature. spring