长期定位施肥对夏玉米籽粒灌浆影响的模拟研究

在25年肥料定位试验的基础上，2006年对夏玉米籽粒灌浆过程进行了研究，旨在探讨玉米高产栽培措施。结果表明:在冬小麦夏玉米轮作条件下，随着肥料用量的增加穗粒数明显增加，其中化肥增加幅度为103.6～161.6%，秸秆的增加幅度较小为11.9～58.9%，化肥和秸秆配合施用穗粒数增加的幅度为105.7～159.6%。子粒干物质积累过程呈“S”型曲线，可用Logistic模型进行模拟，相关系数均达0.99以上。随着施肥量的增加，达到最大灌浆速率的时间延长，整个灌浆进程延长，但最大灌浆速率差异不显著。

Modeling the effect of long-term fertilization on grain filling of summer maize

Based on a 25-year allocated experiment at the Experimental Farm in Hengshui, the process of grain filling in summer maize was studied in 2006 . The results indicated that under the condition of wheat and maize rotation, grain number increased with fertilizer rates. Chemical fertilizer, straw and their combinations increased grain number by 103.6%-161.6%, 11.9%-58.9% and 105.7%-159.6%, respectively. The grain dry weight accumulation could be described by logistic model, and the correlation coefficient was over 0.99. The filling period was increased by more fertilizer application, but the maximum filling rate was not significantly influenced.