植物（草本和木本植物）燃烧后的残余物，称草木灰。属于不可溶物质。草木灰肥料因草木灰为植物燃烧后的灰烬，所以是凡植物所含的矿质元素，草木灰中几乎都含有。草木灰质轻且呈碱性，干时易随风而去，湿时易随水而走，与氮肥接触易造成氮元素挥发损失。
另外，白瓷釉可能是加有草木灰的钙釉。
In addition, the glaze belongs to calcium glaze in which plant ash was added.
伴随着目前秸秆发电厂的兴建，提取秸秆燃烧后草木灰中丰富的生物钾资源受到越来越广泛的重视。
With currently enormous construction of the straw power generation, leaching of abundant biotic potassium in the plant ash is catching more and more attention.
但类似的易熔组分和添加草木灰又成为配制原始瓷铀的配方，从而过渡到原始瓷器的发明的一个重要因素。
But some similar recipe of fusible clay-plant ash mixture also played an important role in the invention of porcelain glaze in shang dynasty.
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