不同水氮处理对玉米生理特性及产量的影响OA

[Objective]To investigate the effects of different irrigation amounts and nitrogen application rates under drip fertigation on the physiological characteristics and yield of maize.[Method]A randomized block experiment was conducted with four irrigation levels(W0,W1,W2,W3)and four nitrogen application rates(N0,N1,N2,N3),resulting in a total of 16 water-nitrogen combination treatments.The W0N0 treatment was set as the control(CK).The effects of these 16 water and nitrogen treatments on maize plant height,leaf area index,chlorophyll content(SPAD),yield and yield components were analyzed.[Result]With the increase of irrigation amount and nitrogen application rate,plant height,leaf area index and SPAD value all showed a significant upward trend.Plant height reached its peak under the W2N2 treatment during the grain-filling stage.The leaf area index increased most rapidly from the large trumpet stage to the tasseling and silking stage,and reached its peak at the tasseling and silking stage.The leaf area index of the W2N2 treatment at this stage was 5.90,which was 30.24%higher than that of the CK treatment.Under different treatments,chlorophyll content increased first and then decreased with the increase of nitrogen application rate.Aboveground dry matter accumulation increased with the increase of irrigation amount and nitrogen application rate,reaching its peak dur-ing the grain-filling stage.Under the irrigation amount of 5 400 m3/hm2 and nitrogen application rate of 225 kg/hm2,that is,the W2N2 treat-ment,the yield of corn was the highest,reaching 21 141.0 kg/hm2,which was significantly higher than the CK treatment by 17 185.5 kg/hm2,with an increase rate of 23.02%.[Conclusion]Under drip fertigation,the highest mazie grain yield was achieved at an irrigation amount of 5 400 m3/hm2 and nitrogen application rate of 225 kg/hm2.