Abstract
In order to find out the shortage of effective element in three different pool's water. We filtered the water in each pool and took 200cc into a flask respectively, and after adding them one or two drops of 1-5% solution of various reagents, cultivated Oosystis for 20-50days in them indoors. The element, which had been added to the remarkably multiplied group of the cultivated plant, is to be regarded as the shortage of effective element; that is as follows.
Shortage of Oike's water was Organic matter and N-Compound same times Fe-Compound and P-Compound.
Shortage of Shinike's water was Organic matter and P-Compound.
Shortage of Asama-ike water was N-Compound and Organic matter.
