PROBLEM TO BE SOLVED: To provide a fertilizer performance estimation method for estimating the fertilizer performance efficiency based on the fertilizer material of algae which is used in the sea area and a management method of the sea area fertilizer material using this fertilizer performance efficiency estimation method.SOLUTION: A fertilizer performance efficiency estimation method of a sea area fertilizer material includes: a steel-making slag and a hemic acid-containing material. This method prepares a sample alkaline eluate eluted from the fertilizer material by bringing the fertilizer material into contact with sea water at a prescribed ratio under a contact condition, and analyzes the obtained sample alkaline eluate by an FFF-ICP-MS. In this FFF-ICP-MS analysis, the presence or absence of the fertilizer performance is determined by using a signal/noise ratio (S/N ratio) between a signal having an Fe signal intensity appearing in the holding time equivalent to a particle size 2 to 10 nm and noise. Further, the sea area fertilizer material is managed by using this fertilizer performance efficiency estimation method.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】海域で用いられる藻類の施肥材について、その肥効性を評価するための肥効性評価方法を提供すると共に、この肥効性評価方法を用いた海域用施肥材の管理方法を提供する。【解決手段】製鋼スラグと腐植酸含有物質とを含む海域用施肥材の肥効性評価方法であり、施肥材と海水とを所定の量比及び接触条件で接触させてこの施肥材から溶出する試料溶出水を調製し、得られた試料溶出水をFFF-ICP-MSで分析し、このFFF-ICP-MS分析において、粒径2~10nmに相当する保持時間に現れるFe信号強度のシグナルとノイズとのシグナル/ノイズ比(S/N比)を用いて肥効性の有無を判断する。また、この肥効性評価方法を利用して海域用施肥材を管理する。【選択図】図1
