Cultural experiments were made with marine organisms in enriched crude sea water and in bacteria-free cultures with the phosphorus supplied in different forms. It was found that pyrophosphate cannot be utilized as a source of phosphorus as effectively as orthophosphate by the organisms cultured, i.e. Phaeocystis Pouchetii, Skeletonema costatum and Nitzschia closterium. Growth of Phaeocystis Pouchetii was a little better and lasted longer when phytin was supplied to natural sea water as a source of phosphorus than when orthophosphate was supplied. Phytin can also support a growth of Skeletonema costatum and Nitzschia closterium as good as, or a little better than, orthophosphate.The organic phosphorus compounds used in these experiments were found to be broken down into orthophosphate in natural sea water. In bacteria-free cultures phytin and glycerophosphoric acid can be effectively used as such by Nitzschia closterium forma minutissima as a source of phosphorus, while sodium nucleinate and lecithin can not be effectively used as such. The organic phosphorus dissolved out from the blades of Laminaria can also be utilized by this diatom as effectively as orthophosphorus.It would seem, therefore, that not only the dissolved orthophosphate as generally assumed, but the dissolved organic phosphorus in the sea may also be absorbed and utilized by plants.

中文翻译：

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浮游植物对有机磷的利用

在富集的粗海水和以不同形式供应的磷的无细菌培养物中对海洋生物进行了培养实验。发现焦磷酸盐不能像正磷酸盐一样被培养的生物体有效地用作磷源，即褐藻,肋骨骨架和Nitzschia closterium. 的增长褐藻将phytin作为磷源供应到天然海水中比供应正磷酸盐时效果好一点，持续时间更长。Phytin还可以支持生长肋骨骨架和Nitzschia closterium与正磷酸盐一样好或略胜一筹。发现这些实验中使用的有机磷化合物在天然海水中分解成正磷酸盐。在无细菌培养物中，植蛋白和甘油磷酸可通过以下方式有效使用Nitzschia closterium forma minutissima作为磷的来源，而核素钠和卵磷脂不能有效地用作磷源。有机磷从叶片中溶解出来海带这种硅藻也可以像正磷一样有效地利用它。因此，似乎不仅是通常假设的溶解的正磷酸盐，而且海洋中溶解的有机磷也可能被植物吸收和利用。