基于AHP-EWM-TOPSIS模型的北疆滴灌春玉米水氮定额管理效应分析OA

In order to deal with the shortage of agricultural water supply and demand in summer in arid inland river basin,and improve the water and nitrogen utilization efficiency of spring maize under drip irrigation,a field experiment was conducted in Yaozhanzi village,Banjiegou town,Qitai county,Xinjiang taking spring corn irrigated by drip irrigation as the research object.5 irrigation levels,including 3 600(W1),3 300(W2),3 000(W3),2 700(W4)and 2 400 m3·hm-2(W5),and 3 nitrogen application levels,including 461(N1),428(N2)and 394 kg·hm-2(N3),were set,the effects of low water and nitrogen management on spring corn yield and water use efficiency(WUE)and partial factor productivity from nitrogen fertilizer(PFPN)were investigated,and the lower quota irrigation fertilization scheme was optimized.The results showed that maize plant height,stem diameter,leaf area index and above-ground dry matter increased with the increase of irrigation amount,and increased first and then decreased with the increase of fertilizer amount,among which W1N2 treatment was the best treatment.With the increase of irrigation amount,the yield and PFPN showed an increasing trend,while the WUE showed a decreasing trend.With the increase of fertilizer amount,the yield and WUE increased first and then decreased,while the PFPN decreased continuously.W1N2 treatment had the highest yield(19 250 kg·hm-2),W5N2 treatment had the highest WUE(4.52 kg·m-3),and W1N2 treatment had the highest PFPN(44.77 kg·kg-1).Based on the evaluation results of the analytic hierarchy process-entropy weight method-technique for order preference by similarity to an ideal solution(AHP-EWM-TOPSIS)model constructed with 15 index layers,such as water use efficiency,net profit and yield to investment ratio,the irrigation quantity was 3 000～3 600 m3·hm-2,and the nitrogen application rate was 394～428 kg·hm-2,which was the recommended low water and nitrogen quota management scheme,and the yield reached 17 010～19 250 kg·hm-2,WUE was 3.69～4.14 kg·m-3,PFPN was 22.89～25.67 kg·kg-1.This method provided a reliable evaluation system for the comprehensive benefit of crop growth.Above results provided model and data reference for the formulation of water and nitrogen application strategies for spring maize under drip irrigation in arid areas,which was of great significance for maximizing agro-ecological and economic benefits.