氮(N)是蛋白质和核酸等重要有机物的成份。磷(P)是核酸等重要有机物的成份。它们在细胞代谢中发生重要的作用。海带或其他生物在代谢过程中都必须有一定数量的氮和磷的供应,才能正常地生长和发育。Drew(1910)的实验指出,在天然海水中加入一些无机盐的氮和磷可以促进糖海带配子体的生长。Harries(1932)的实验指出:磷促进海带配子体的细胞分裂。当磷的含量超过氮时,配子体会生长成为多细胞分枝体,结果不能发育为孢子体,当氮的含量过多时,配子体的生长延缓,发育推迟。木下 Nitrogen (N) is a component of important organic substances such as proteins and nucleic acids. Phosphorus (P) is a component of important organic substances such as nucleic acids. They play an important role in cellular metabolism. Kelp or other organisms in the metabolic process must have a certain amount of nitrogen and phosphorus supply, in order to normal growth and development. Experiments by Drew (1910) point out that the addition of inorganic salts of nitrogen and phosphorus to natural seawater can promote the growth of sugar kelp gametophytes. Experiments by Harries (1932) indicate that phosphorus promotes cell division of kelp gametophytes. When the phosphorus content exceeds nitrogen, the gametophyte will grow into a multicellular dendritic body, the result can not develop into sporophytes, when the nitrogen content is too much, the gametophyte growth retardation, delayed development. Kinoshita