水氮耦合对山西旱地冬小麦籽粒产量和氮吸收影响研究

Interactive Effects of Irrigation and Nitrogen Fertilizer on Grain Yield and Nitrogen Recovery of Dryland Winter Wheat

2009和2010年分别对山西省襄汾县旱地冬小麦150和96个样本水氮田间耦合效果进行了调查研究。结果表明,该地区农户冬小麦产量处于偏低水平,增产潜力较大。不同产量等级的氮肥投入量相差不大,2009、2010年平均为123.2、136.2 kg/hm2,属于偏低水平,但随着平均产量、氮吸收量、利用率的增加,平均灌溉次数增加。当灌溉次数从0增加到4次时,对应的平均产量、氮肥吸收量和利用率与灌溉次数呈正相关。故适当增施氮肥和以水促氮是提高冬小麦产量、氮吸收量和吸收率的重要途径。

The aim was to know the production on dryland winter wheat in Shanxi,and provide reference for the field irrigation management of high yield and quality cultivation of strong gluten wheat,150 and 96 samples in Quwo County,Shanxi Province in 2009 and 2010 were investigated,and interactive effects of irrigation and nitrogen fertilizer on yield and nitrogen recovery were analyzed.Result： the number and ratio of the sample declined with ascending of the yield grade,which the mean yields are very low each year,and the yields about 90.6%、72.9% of the samples were below 4 000 kg/hm2,but productive potentialities was greater.It was low level that the means N application were respectively 123.2、136.2 kg/hm2,and mean irrigation frequency increased with increasing of mean grain yield and N recovery and N recovery rate.When the irrigation frenqucy increased from 0 to 4 times,the grain yield and N recovery and N recovery rate also increased.Therefore,increasing N application and irrigation times properly are the feasible way in improving yield of winter wheat and N recovery and N recovery rate in dry land.