水中施肥に関する研究-II : マクサの窒素吸収を促進する燐の効果とそれらに及ぼす光の影響

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The present paper deals with the studies carried out to find the effect of phosphorus on the absorption of nitrogen of an agar seaweed (Gelidium amansii) and the influence of light intensity on this effect, as a part of the writer’s studies on the manure for agar seaweeds. The results obtained are summarized as follows: 1) The nitrogen absorption of the agar seaweed was promoted remarkably by the addition of phosphorus to the culture solution. The optimum ratio of nitrogen to phosphorus was 2:1 ?? 2:2 when the ammonium nitrogen content was 2-10 ppm. 2) There seems to exist a close relation between the nitrogen absorption of the seaweed and the light intensity. When the light intensity is higher than the compensation point of the seaweed, a considerable amount of nitrogen is absorbed. On the contrary, when the light intensity becomes below that point, the once absorbed nitrogen appears to be discharged into the medium. 3) From these results it can be suggested that a manure for agar seaweeds should contain a mixture of nitrogen and phosphorus and that the manuring should be done when the light intensity in the sea is higher than the compensation point of the aimed seaweed.
公益社団法人日本水産学会の論文