干旱地区农业研究Issue(1)：79-84,152,7.DOI:10.16302/j.cnki.1000-7601.2015.01.013
秸秆还田下减量施氮对作物产量及养分吸收利用的影响
Effects of reducing nitrogen application on crop yields,nutrients uptake and utilization with straw incorporation
摘要
Abstract
The long term field experiment on N fertilizer reduction under the conditions of straw incorporation was conducted to identify a suitable N rate and provide the theoretical basis of reasonable fertilization for the farmland in wheat-straw cropping system on Guanzhong Plain .Three treatments ,conventional applied N ,15% and 30% reduction applied N ,were performed by a randomized complete block design with three replications .The results showed that ,in comparison with conventional N application treatment ,averaged across three years from 2008 to 2011 ,N reduction by 15% and 30% did not significantly reduce crop grain and straw yields .During the crop growing seasons from 2010 to 2011 ,N reduction by 15% reduced straw N ,P ,K annual uptake and increased grain N ,P ,K annual uptake ,especial-ly for grain P uptake .N reduction by 30% significantly reduced grain N ,straw N ,K annual total uptake by 12 .9% , 41 .9% ,18 .5% respectively .30% N reduction treatment had the lowest N surplus after harvesting wheat and maize , the N surplus was only 11 .3 kg·hm-2 when wheat was harvested ,partially associated with a shortage of N .Taking into account into consideration of the yield ,nutrients uptake and utilization ,apparent soil N balance ,the 15% N reduction treatment has an optimum N application rate (wheat season 127 .5 kg·hm-2 ,maize season 159 .4 kg·hm-2 ) in this re-gion .关键词
秸秆还田/减量施氮/产量/养分含量/养分吸收量Key words
straw incorporation/nitrogen reduction/crop yields/nutrient content/nutrient uptake分类
农业科技引用本文复制引用
李有兵,李锦,李硕,田霄鸿..秸秆还田下减量施氮对作物产量及养分吸收利用的影响[J].干旱地区农业研究,2015,(1):79-84,152,7.基金项目
国家科技支撑计划项目（2012BAD14B11）；国家自然科学基金项目 （）
