山东农业科学2012，Vol.44Issue(12)：60-65,6.
施氮时期对冬小麦植株-土壤体系肥料氮去向的影响
Effects of Nitrogen Topdressing Stage on Fate of Fertilizer Nitrogen in Winter Wheat-Soil System Using 15 N Tracer Technique
摘要
Abstract
In this study, the 15N - isotopic tracer experiment was conducted to study the effects of nitrogen topdressing stage on fate of fertilizer nitrogen in winter wheat - soil system. The results indicated that with the delay of nitrogen application, the N content of wheat grains increased, while that of leaves and stem decreased. The total N accumulation amount ( TNAA) in plant was the highest when topdressing at jointing stage ( JT). N application at JT was beneficial to increasing the TNAA in grains, reducing the TNAA in vegetative organs, and promoting the transportation of N from vegetative organs to grains. The N productive efficiency and N harvest index of winter wheat were the highest when topdressing at JT compared to topdressing at the other stages. Nitrogen topdressing at JT was more conducive to promoting the N absorption of strong gluten wheat varieties and increasing the N utilization of the middle and weak gluten wheat varieties. The percentage of TNAA from fertilizer decreased with the delay of nitrogen application. Postponing the N topdressing stage, the percentage of TNAA from basal fertilizer increased, while that from topdressing fertilizer reduced. With the delay of nitrogen application, the residues of fertilizer N in 0～100 - cm soil showed increasing trend. Compared to N application at stem elongation (SE) and booting stage ( BT), the residues of fertilizer N in 20～60 - cm soil were higher as N application at JT after irrigation. The comprehensive analysis showed that the fate of fertilizer N was more balanced with N application at JT content.关键词
黄淮地区/冬小麦/15N示踪/施氮时期/氮素利用效率/氮去向Key words
HuangHuai wheat area/ Winter wheat/ 15N tracer/ Nitrogen topdressing stage/ Nitrogen use efficiency/ Fate of nitrogen分类
农业科技引用本文复制引用
翟学旭,王振林,戴忠民,王平,尹燕枰,曹丽,崔正勇,吴光磊..施氮时期对冬小麦植株-土壤体系肥料氮去向的影响[J].山东农业科学,2012,44(12):60-65,6.基金项目
国家重点基础研究发展计划("973"计划)项目(2009CB118602),国家公益性行业(农业)科研专项(201203100),国家自然科学基金项目(30871477)和山东省自然科学基金项目(ZR2010CM044)资助. （"973"计划）
