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Used coffee grounds are the waste product from brewing coffee. In the late 19th century, used coffee grounds were used to adulterate pure coffee.〔Pendergrast, Mark ''"Uncommon grounds : the history of coffee and how it transformed our world"'' 2010 Basic Books. ISBN 978-0-465-02404-9〕 In gardens, coffee grounds may be used for composting or as a mulch as they are known to slowly release nitrogen into the soil. The (coffee grounds are rich ) in potassium, magnesium and phosphorus. They are especially appreciated by worms and acid-loving plants such as blueberries. Gardeners have reported the use of used coffee grounds as a slug and snail repellent,〔 but this has not yet been scientifically tested. Some commercial coffee shops run initiatives to prevent the grounds from going to waste, including Starbucks' "Grounds for your Garden" project,〔(【引用サイトリンク】title=Grounds for Your Garden )〕 and community sponsored initiatives exist, such as "Ground to Ground".〔(【引用サイトリンク】title=About Us | Coffee Grounds to Ground )〕 Used coffee grounds have other homemade uses in wood staining, air fresheners, and body soap scrubs.〔 They may also be used industrially in biogas production or to treat wastewater. ==See also== *Ecological effects of coffee 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「used coffee grounds」の詳細全文を読む スポンサード リンク
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