SEEDLING COLLECTION METHOD OF SAND-SUBMERGED BIVALVE OR OYSTER USING NEUTRALIZED SOLID MATTER

To provide a neutralized solid matter for neutralization of sea water tilted to be acidic in an intertidal zone and a manufacturing method thereof, and a seedling collection tool using the neutralized solid matter.SOLUTION: A granular molding 5, including an oyster shell powder 1, an alkaline binder 2 containing an inorganic magnesium compound as a main constituent, a pH increase retarder 3 containing calcium sulfate and/or sodium hydrogen carbonate which can weaken alkalinity in dissolution of the binder into water as main constituents, to be kneaded, solidified, and molded into granular shape, is cured in a carbonic acid gas atmosphere filled with carbonic acid gas to form a granular cured body 6. A dissolution rate of the granular molding is lower than a dissolution rate in natural drying, and acidic substances in sea water in an intertidal zone is neutralized.SELECTED DRAWING: Figure 2 【課題】潮間帯の酸性に傾いた海水を中和する中和固形物及びその製造方法、さらに該中和固形物を用いた採苗具を提供する。【解決手段】カキ殻の粉末１と、主成分が無機マグネシウム化合物であるアルカリ性のバインダ２と、主成分が該バインダの水への溶解時におけるアルカリ性を弱める硫酸カルシウム又は／及び炭酸水素ナトリウムのpH上昇抑制剤３と、を含んで混錬固化して粒状に成形された粒状成形体５が、炭酸ガスを充満した炭酸ガス雰囲気下で硬化してなる粒状硬化体６にして、前記粒状成形体の自然乾燥時における溶解速度よりも溶解速度が遅延し、潮間帯の海水中の酸性物質を中和する。【選択図】図２