草铵膦，英文名Glufosinate，其铵盐DL-phosphinotricin是一种非选择性除草剂。其作用机理是干扰谷氨酸的生物合成及氨的解毒。

Glufosinate (also known as phosphinothricin and often sold as an ammonium salt) is a naturally-occurring broad-spectrum systemic herbicide produced by several species of Streptomyces soil bacteria. Plants also metabolise bialaphos, another naturally-occurring herbicide, directly into glufosinate. The compound irreversibly inhibits glutamine synthetase, an enzyme necessary for the production of glutamine and for ammonia detoxification, giving it antibacterial, antifungal and herbicidal properties. Application of glufosinate to plants leads to reduced glutamine and elevated ammonia levels in tissues, halting photosynthesis, resulting in plant death.