根据经济林木试管茎尖嫁接近20年来的研究成果，提出了今后的重点研究领域。
Based on the experiment achievement of shoot apex grafting in economic trees in the last 20 years, the key field for the future research has been pointed out.
到上世纪九十年代之后，种田种地收入更加低下，只有经济林木可能换得较好的现金收入。
By the time of 1990s, income from land tillage became even meagrer and only cash forests could enable cash benefits.
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.
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.
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