干旱半干旱区降水少，土壤水分亏缺，林木成活率低、保存率低、生长缓慢。
In the arid and semi arid area, the precipitation is little, soil moisture insufficient and low survival rate, low preserved rate and slow growing of trees.
PGPR接种剂和腐殖酸型肥料对于黄土高原的造林成活率和经济林木的产量都有一定的提高作用。
PGPR inoculum and humic acid-contained fertilizer can increase the survival rate of afforestations on loess plateau as well as the output of economic trees.
造林前用双吉尔—GGR6号植物生长调节剂对华北落叶松苗进行浸根处理，可提高造林成活率和林木生长量。
The seedlings of L. principis-rupprechtii, treated by means of root soaking in GGR6, would be beneficial to raise survival rate for afforestation and to increase growth rate.
造林前用双吉尔—GGR6号植物生长调节剂对华北落叶松苗进行浸根处理，可提高造林成活率和林木生长量。
The seedlings of L. principis-rupprechtii, treated by means of root soaking in GGR6, would be beneficial to raise survival rate for afforestation and to increase growth rate.
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