Abstract
To promote the growth of seaweed using fertilization is one of the Isoyake recovery techniques. However, the nutrient concentration in sea water which is necessary for the recovery of the seaweed bed was indefinite. Therefore, it was difficult to judge the appropriate provision of the fertilizer. The author has illustrated about the problem on the fertilization as the Isoyake recovery technique. Also, to make the nutrient concentration rise in the coastal region which is under the influence of the advection and diffusion phenomena, a great deal of fertilizer would be necessary. Therefore, the use of fertilizer to a vast area is not practical. In Japan, the small-scale seaweed community to supply withering seaweed beds with the seed is sometimes developed. If nutrient salt is supplied to such small-scale community, the effect may be expected.
