[多选题]以下对于非充分灌溉表述正确的是（ ）。

A.ET<sub style=\color: rgb(51, 51, 51); font-family: arial, sans-serif;\>a=ET<sub style=\color: rgb(51, 51, 51); font-family: arial, sans-serif;\>m
B.ET<sub style=\color: rgb(51, 51, 51); font-family: arial, sans-serif;\>a<ET<sub style=\color: rgb(51, 51, 51); font-family: arial, sans-serif;\>m
C.ET<sub style=\color: rgb(51, 51, 51); font-family: arial, sans-serif;\>a=K<sub style=\color: rgb(51, 51, 51); font-family: arial, sans-serif;\>θET<sub style=\color: rgb(51, 51, 51); font-family: arial, sans-serif;\>m
D.产量Y<sub style=\color: rgb(51, 51, 51); font-family: arial, sans-serif;\>a=Y<sub style=\color: rgb(51, 51, 51); font-family: arial, sans-serif;\>m