ants for high grain yield was about 5% from emergence to tillering, 3% at jointing, 2.5 at booting, and 1.8% at filling.

• 各生育期植株含氮率为:出苗至分蘖期5%25左右；拔节期3%25左右；孕穗期2.；5%25；灌浆期1