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69、72等意杨造林后,往往成活率很低.但在起苗后及时浸水,就可大大提高造林的成活率.我场于1982年春营造的69、72杨,苗高4米,平均根径3厘米,苗木根系完整,起苗后,没有泡水,只是随时打浆,按照大塘深栽的要求造林,结果成活率只有37.5%.而在1973年春造林时.采取了随起苗随泡水的方法:结果泡水24小时的成活率为80.5%;48小时的成活率为90%;72小时的成活率仍很高.这一年所造的870亩意杨林,成活率高达97.5%.
69,72 Young poplar forest, the survival rate is often very low, but in time after the seedling soaking, can greatly improve the survival rate of afforestation. I field in the spring of 1982 to create 69,72 young, 4-meter-high seedlings, the average Root diameter of 3 cm, seedlings root system intact, after the seedling, there is no water, but beating at any time, in accordance with the requirements of Datang deep planting afforestation, the results of survival rate of only 37.5% .In the spring of 1973 when afforestation with The method of soaking water: the result is that the survival rate of soaking water for 24 hours is 80.5%; the survival rate for 48 hours is 90%; the survival rate for 72 hours is still very high. 97.5%.