A plaster material and a method for manufacturing the same are provided to suppress phosphorous from being eluted from sediments to the water level, by preparing plaster granules so as to cap the sediments of stationary eutrophic lake. Plaster powder of 50 wt% is mixed into normal temperature water of 30-40 wt% to prepare plaster dough. The plaster dough is stationed for a predetermined time. Plaster powder of 50 wt% is added and mixed to the plaster dough. The resultant plaster dough is dried and solidified. The solidified plaster dough is cut to prepare plaster granules. A binder is additively mixed into the normal temperature water while the plaster powder is mixed into the normal temperature water.
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