PROBLEM TO BE SOLVED: To provide a covering material for raising seedling which can manage temperature to temperature at which seedling burnt does not occur even when ambient temperature is high, and which can take light required for raising seedling.SOLUTION: There is provided a covering material for raising seedling which is used for thermal insulation in a seedling raising period of seedling, and covers a housing body 20 for storing seedlings. The covering material for raising seedling comprises: a white layer 40 exposed to outside of the housing body 20, and to which a white pigment is blended； and a silver layer 32 exposed to inside of the housing body 20, and to which silver-colored metallic particles are blended, so that, a reflection ratio to near infrared radiation of wavelength of 800 nm becomes almost 42-73%.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】外気温が高い場合であっても、苗やけしない温度に管理可能であって、しかも、育苗に必要な光を取り込むことができる育苗用被覆資材を提供すること。【解決手段】種苗の育苗期における保温に用いられ、種苗を収容した収容体２０を覆う育苗用被覆資材であって、収容体２０の外側に露出し、白色顔料が配合された層である白層４０と、収容体２０の内側に露出し、銀色となる金属製粒子が配合された層である銀層３２とを有することで、８００ｎｍの波長の近赤外線に対する反射率が略４２～７３％となるようにした。【選択図】図１
