A.出苗-返青B.出苗-孕穗C.出苗-灌漿D.出苗-成熟
A.4.5-5.5B.5.0-6.0C.5.5-6.5D.6.0-7.0
A.2:1.5:2.5B.2:1:2C.2:1.5:3D.2:1:2.5