刺老牙，它的嫩芽是早春的名优特菜，被称之为“山菜之三”，它的保护地栽培系指采用塑料大棚和地膜覆盖栽培法。利用保护地栽培可为刺老牙的生育创造一个良好的生长环境，延长生育期。同时可以提高产量、提前一个多月上市，使经济效益明显提高。保护地栽培是干旱、寒冷地区发 Thorn old teeth, its bud is the famous spring special dishes, known as “three of the mountain vegetables,” its protective cultivation refers to the use of plastic greenhouses and plastic film cultivation method. The use of protective cultivation of thorns for the growth of childbirth to create a good growth environment, to extend the growth period. At the same time can increase production, listed more than a month ahead, so that economic benefits improved significantly. Protected cultivation is arid, cold areas hair