EXPERIMENTAL STUDY ON THE EFFECTS OF THE RELEASE OF NUTRIENT SALTS FROM THE SEDIMENT BY THE TILLING WITH MUD FLAT MOVE MACHINE IN MUD FLAT

Abstract

Recently, nori culture in the Ariake Sea is a poor harvest. It is known that one of the factor of the poor harvest of nori culture is a shortage of nutrients required for growth of nori. Two areas on mud flat in the Ariake Sea, where one area is tilled with a mud flat move machine and another area is not tilled with it, were set up for investigation sites in this study. These data of the water quality, the sediment, and the release from sediment of two areas were compared. Consequently, it turnsout that the release of NH₄-N and PO₄-P from the sediment is promoted by the tilling with a mud flatmove machine. Therefore, the tilling with a mud flat move machine was considered to be an effective method as the supply of the nutrient salts at the time of nori culture.