One Observation on the Fish-culture in the Rice-field.
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概要
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The nitrate nitrogen and the inorganic soluble phosphorus in the water of the rice field culturing the carp have been estimated, (cf. Table 1)., and by the application of the following formula N:P=7.2:I presented by Fleming, the data were analysed (cf. Table. 2). As the result of that, the amounts of N and P which have satisfied the above formula, have sharply dropped at the middle period of August, and this fact agrees with the plankton data presented by prof. D. Inaba. of the Tokyo College of Fisheries (cf. Fig. 1.), so there is little hope for the new production of the carp-diet-plankton after the midtime of August. We, therefore, must feed the carp with some diets or give the fertilizer sometimes earlier. This fact can also be proved from the richness of ash, and protein percentage and poorness of fat percentage analysed on the gotten fish at the end of the experiment (cf. Table. 3).
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