在氮供应不足的条件下，氮素是蔬菜产量的限制因子。
When the nitrogen supply was not enough, it was main limiting factor of vegetable yield.
推进剂最大流量依赖于一氧化二氮供应系统自身增压能力。
The most flux of the propellant depends on the self-pressurizing ability of the nitrous oxide supply system.
一定水氮供应条件下，露地生产蔬菜地土壤硝态氮有可能淋洗到1.8米土体以下。
Under a certain water and nitrate treatments, soil nitrate in open-land vegetable field would move down below 180cm soil.
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