Influence of new soil conditioner and nitrogen fertilizer on water-nitrogen use efficiency of winter wheat under regulated deficit irrigation

【Objective】 This experiment aimed to study the influence of new soil conditioner(main material was straws) and nitrogen fertilizer applied in winter wheat field on wheat yield and water-nitrogen use efficiency under regulated deficit irrigation.【Method】 This experiment was carried out with winter wheat Xinong 979 cultivar as material and used field plot and microplot.Under regulated deficit Irrigation(non-irrigating,irrigating 1.467 m3/hm2),different levels of the new soil conditioner(0,1 500 kg/hm2) and N fertilizer(pure nitrogen:0,160,288 kg/hm2) were used to wheat field.This experiment had 12 treatments,in order to study the influence of coupling new soil conditioner and nitrogen fertilizer application on yield of winter wheat,soil water and nitrogen use efficiency in harvest period under regulated deficit irrigation.【Result】 The results showed that the use of new soil conditioner and N fertilizer can improve the soil water in harvest period of winter wheat and enhance soil water content,water used efficiency and grain yield.Moreover,the effects were more remarkable with irrigation.Applying new soil conditioner combined with N fertilizer not only can enhance soil NO-3-N concentration obviously in 0-200 cm soil depth,but also improve nitrogen uptake.The yield,water used efficiency and nitrogen uptake were clearly higher when applying 1 500 kg/hm2 soil conditioner combined with 288 kg/hm2 N fertilizer nevertheless irrigation or not.【Conclusion】 With the moderate deficit irrigation,coupling of soil conditioner and appropriate amount of N fertilizer significantly increased yield and wheat water-nitrogen use efficiency.