中文摘要：

2010和2011年在黑龙江省3个积温带（Ⅰ、Ⅱ、Ⅲ）上,以不同基因型玉米品种郑单958和丰单3号为试材,研究不同环境温度下外源植物激素复配剂聚糠萘水剂（PASP-KT-NAA,PKN）对玉米籽粒灌浆过程和产量的影响.结果表明：从第Ⅰ积温带到第Ⅲ积温带,玉米灌浆期的温度呈降低趋势;平均最低气温分别为12.16、11.40和9.56℃,玉米籽粒灌浆中后期有效积温不足,平均最低气温低于16℃,严重影响玉米的灌浆过程.施用PKN处理提高了3个积温带玉米籽粒干物质积累和籽粒灌浆速率;延迟了丰单3号籽粒灌浆速率达峰值的时间（Tmax）,提早了郑单958的Tmax;提高了两品种籽粒灌浆速率最大时的生长量和籽粒最大灌浆速率;缩短了籽粒的灌浆活跃期.PKN处理明显提高了3个积温带下两玉米品种的产量,第Ⅲ积温带的郑单958和丰单3号产量分别比第Ⅰ、Ⅱ积温带高8.2%、5.1%和3.4%、0.8%.施用外源PKN有助于玉米利用有限的积温,提高籽粒灌浆速率,降低籽粒含水量,最终增加产量.

英文摘要：

Taking the two maize varieties Zhengdan 958 and Fengdan 3 grown on the three accumulated temperature zones（Ⅰ,Ⅱ and Ⅲ） in Heilongjiang Province as test materials,a field investigation was made in 2010 and 2011 to study the effects of PASP-KT-NAA（PKN）,a compound of exogenous plant growth regulators,on the grain filling and yield of the varieties under different environmental temperatures.From zone Ⅰ to Ⅲ,the air temperature at the grain filling stage had a decreasing trend,with the average minimum temperature being 12.16,11.40,and 9.56 ℃,respectively.The effective accumulated temperature at the mid-late stage of grain filling was too low to be sufficient for grain filling,which severely affected the grain filling process.Applying N,P and K promoted the dry matter accumulation of maize grain and the grain filling rate in the three zones,delayed the peak time（Tmax） of the grain filling rate of Fengdan 3 but advanced that of Zhengdan 958,promoted the growth capacity at peak time of grain filling rate and the maximum grain filling rate of the two varieties,and shortened their active grain filling period.Applying N,P,and K increased the grain yield of the two varieties in the three zones obviously,and,as compared with those in zones Ⅰ and Ⅱ,the grain yields of Zhengdan 958 and Fengdan 3 in zone Ⅲ were increased by 8.2% and 5.1%,and 3.4% and 0.8%,respectively.Therefore,applying N,P and K could help maize utilizing the limited accumulation temperature,improve the grain filling rate,decrease the grain water content,and ultimately,increase the maize yield.