作物学报 ›› 2013, Vol. 39 ›› Issue (02): 292-299.doi: 10.3724/SP.J.1006.2013.00292
梁效贵,张经廷,周丽丽,李旭辉,周顺利*
LIANG Xiao-Gui,ZHANG Jing-Ting,ZHOU Li-Li,LI Xü-Hui,ZHOU Shun-Li*
摘要:
为了验证玉米临界氮稀释曲线在我国华北地区的适用性,探讨以氮营养指数评价玉米氮营养状况的可行性,以郑单958为材料,设置5个氮肥处理(0、60、120、180和240 kg N hm-2),利用2年定位试验数据研究了夏玉米临界氮稀释曲线和氮营养指数。结果表明,一定范围内随着施氮量增加,地上部生物量(W)显著增长。玉米各生育时期不同氮肥处理的生物量和氮浓度数据可经统计分析分为限氮和非限氮两组,据此计算各生育时期临界氮浓度(Nc)并建立了夏玉米临界氮稀释曲线模型(Nc = 34.914W-0.4134),模型参数与已有报道具有较好的相似性。根据模型推算的氮营养指数与相对氮累积量、相对地上部生物量和相对产量均具显著相关性。因此,利用临界氮稀释曲线和氮营养指数可以预测华北地区夏玉米植株临界氮含量和表征植株氮营养状况。
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