relative soil moisture

The results showed that relationship between the weed and the soil moisture in cultivated horizon was obvious. The monocots whose relative abundance increased with the soil moisture are the most abundant in the seriously waterlogged area.

结果表明，该地区油菜田杂草的发生特点与耕作层土壤水分含量存在明显关系：对产量危害较大的禾本科杂草在重渍害区为优势种群，其相对多度随着土壤水分的增加而增高；

Either enviromental factors such as intensity of light, CO2 concentration, temperature and relative moisture of soil, or interior factor such as the fruit in the axil exerted significant effects on photosynthetic rate except photosynthetic type of diurnal variation.

光照强度、CO2浓度、温度及土壤湿度等外界环境条件，以及黄瓜叶腋负载果实与否的内在因素对光合速率有明显影响，对光合速率日变化类型无影响。

The quality of lint cotton was the best under 65% relative soil moisture capacity condition.

土壤持水量在65%时棉纤维品质最佳。