Historically, lack of nitrogen, not lack of land or water, has been its biggest constraint.
从历史上看，缺氮，不缺土地或不缺水，一直是农业最大的制约因素。
The average ratio of Chl-a to ATP was 4. 8. The growth of phytoplankton was limited by the lack of nitrogen in Meizhou Bay in summer.
叶绿素a与三磷酸腺苷的比值为4.8，湄洲湾夏季浮游植物的生长受氮不足所限制。
From the investigations, lack of nitrogen and phosphorus, oxygen deficiency in aeration basin of SBR, high concentration of sulfide in the wastewater is found.
调查分析得知该厂印染废水存在氮、磷缺乏现象，SBR曝气池存在缺氧现象，废水中硫化物含量较高。
应用推荐