摘要
单细胞绿藻和其他植物一样，在生命活动过程中，需要利用各种化学元素，通过光合作用以合成有机物貭，从而进行生长与繁殖。在单细胞绿藻所必需的各种化学元素中，除了C、H、O等三种有机元素主要是从水和二氧化碳中获得以外，另一种重要的有机元素．N以及其他一系列的必需元素，如P、S、Mg、K、Ca、Na、Fe等等，
In the cultivation of Scenedesmus obliquus,the kinds of nitrogen and phosphorous compounds used in the medium have their own different effects on the growth rate and productivity of the alga.It is now clear that not only the ratio P/N in the medium has to be considered,but that the types of compounds of nitrogen and phosphorus are also very important factors.The sources of the available nitrogen and phosphorous fertilizers constitute factors of importance in high-yield cultivation of this alga. Urea.and nitrate as nitrogen sources are markedly superior to ammonium sulphate for promo- ting the growth of Scenedesmus,and calcium super-phosphate is better than phosphoric acid. A favourable growth of Scenedesmus was obtained when urea and calcium super-phosphate were used as N and P fertilizers combinedly,and gave better yields than when urea and phosphoric acid were used as the N and P fertilizers.Similar results were obtained by the use of potassium nitrate and ammonium sulphate.
