There was a tendency to increase progressively with growing time.Both two former showed positive correlation and the two latter showed rative correlation with fertilizer amounter.

• 结果表明，双玉米氮、磷、钾累积吸收量、累积吸收速率和累积利用率的时段变化类同，即随生育期的推进呈递增趋势，前二者与施肥量呈正相关，后者与施肥量呈负相关。