Sea water contains many kinds of mineral elements, and from the fact it may be expected that the culture of plants will be succecded with sea water or bittern solution, when diluted and added some nutrients such as nitrogen and phosphorous, which are especially defected in the sea. This paper dalt with the results of the experiments, which were carried out to know how the crop plants grow and yield under the condition of water culture with diluted sea water or bittern solution, adding some chemicals or human urine to complete the nutrients. Rice (Oryza sativa L.), barley (Hordeum vuigare L.), buck wheat (Fagopyrum esculentum Gaertn) and kidny bean (Phaseolus vulgaris L.) were selected as materials for the investigation. To meet my expection, the injury caused by salt is not so great as commonly believed, if it is strongly diluted, and the plants treated occasionally grew up more vigorous than controls. In rice plants, the yield of both grains and strow amounted at most, when they were cultured with diluted solution of sea water in the degree of ^1/_<90>-^1/_<150>; but the more diluted, such as ^1/_<180>, soluilon was effective to the growth of barley. On the contrary, the injurious phenomenon appeared on the production in all cases of buck wheat and kidny beans, even a shght in the latter. The amounts of chlorophyll in leaves and carbohydrates (starch and sugars) in grams were slightly reduced than that of control in rice-plants. (Laboratory of Agronomy Faculty of Agriculture Tokyo Imperial University)

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