The differences of ash content among the treatments with different N application methods were not significant at early stage, but became more and more significant after 14th DAA.

• 不同的氮肥运筹下,在籽粒的形成期前后差异不大,在花后14天以后差异较大,后期追氮高的处理灰分下降的幅度大于后期追氮低处理。