| http://www.w3.org/ns/prov#value | - When the photocatalytic powder is an apatite having photocatalytic activity, it is advantageous in that the photocatalytic powder is excellent in adsorption property to pathogenic germs such as bacteria adhering on a plant owing to adsorption property of the apatite and is also advantageous in that the adsorbed pathogenic germ can be efficiently decomposed and eliminated by its photocatalytic acti
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