（三）、 土壤相对含水量(relative water content of soil) 在生产实际中常以某一时刻土壤含水量占该土壤田间持水量的百分数作为相对含水量来表示土壤水分的多少。
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当土壤相对含水量低于75 %，光合非气孔限制因素开始出现。
When relative soil water is below 75%, the cause of photosynthesis rate drop is non-stomatal limitation.
土壤相对含水量80% Q时，各施氮处理叶片相对含水量差异不大。
Leaf relative water content of nitrogen fertilizer treatments had no distinct difference, when soil relative water content was 80%q.
密度、土壤相对含水量、土壤类型及采收期都对鳞茎中大蒜素含量有一定的影响。
The density, the relative content of water, soil type and the harvesting date influenced the allicin content in garlic bulb.
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