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              硝酸鉀俗稱火硝或土硝。它是黑火藥的重要原料和復合化肥。制取硝酸鉀可以用硝土和草木灰作原料。土壤里的有機物腐敗后,經亞硝酸細菌和硝酸細菌的作用,生成硝酸。硝酸根跟土壤里的鉀、鈉、鎂等離子結合,形成硝酸鹽。硝土中的硝酸鹽就是這樣來的。硝土一般存在于廁所、豬、牛欄屋,庭院的老墻腳,崖邊,巖洞以及不易被雨水沖洗的地面。硝土潮濕,不易曬干,經太陽曝曬后略變紫紅色。好的硝土放在灼紅的木炭上會爆出火花。

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