To provide a grass growth-suppressing board having water permeability, being inexpensively produceable, exhibiting high grass growth-suppressing effect by allelopathic action and light-blocking action and being reduced to soil by biodegradability thereof. 透水性を持ち、安価に製造でき、アレロパシー作用と遮光作用とにより高い抑草効果を発揮し、生分解させて全体を土壌に還元する。 - 特許庁