A
crystal of L-
glufosinate ammonium salt, a preparation method therefor and an application thereof, the
crystal of L-
glufosinate ammonium salt comprising two novel
crystal forms, namely novel crystal form D and crystal form E. On the basis of these two crystal forms having low hygroscopicity, the crystal forms not only have excellent stability, but also have good herbicidal effects, having a
plant control effect on weeds such as sorrel, orange
foxtail, sun spurge, bluegrass and other weeds can reach more than 85%.