Effects of Different Irrigation and Nitrogen Treatments on Water Consumption Characteristics and Grain Yield in Wheat

In order to provide theoretical basis for water-saving and high yield of wheat,the field experiment was carried out to study the effects of different irrigation and nitrogen treatments on water consumption characteristics and grain yield of winter wheat.Three treatments of irrigation(W0,no irrigation;W1,irrigation once at jointing stage;W2,irrigation twice at jointing and anthesis stages) with irrigation amount 75 mm each time,and five N fertilizer rate(0 kg·hm-2,N0;90 kg·hm-2,N1;180 kg·hm-2,N2;240 kg·hm-2,N3;300 kg·hm-2,N4) were designed with winter wheat Bainongaikang58.The result indicated that with the increase of N fertilizer rate,the total water consumption and soil water consumption increased at first and then reduced with the highest value in N3 treatment,and all water use efficiency had the similar trend.The total water consumption,soil water use efficiency and precipitation use efficiency increased with the increase of irrigation times,but yield water use efficiency and irrigation water use efficiency were in the contrary.The stage water consumption enhanced with irrigation times,and the effect of N fertilizer rate on stage water consumption was different due to irrigation condition.The water consumption of the N2 and N3 treatment were relatively higher during jointing to anthesis stage,and lower during anthesis to maturity stage.The grain yield increased at first and then decreased with the increase of N fertilizer rate,and the yield of treatments of N-fertilizer were significantly higher than that of N0 treatment with the highest in N3 treatment.With the increase of irrigation times,the grain yield enhanced persistently.The treatment of W2N3 reached the highest grain yield,and in consideration of the production cost,W1N3 could be the water-saving and high-yield water and nitrogen management mode in the production practice.