西辽河平原灌区氮高效玉米品种筛选及栽培优化分析OA

This study focuses on 10 maize varieties,with three nitrogen levels of 0 kg/hm2,180 kg/hm2,and 270 kg/hm2,and two planting densities of 6×104 plants/hm2 and 9×104 plants/hm2,to investigate the yield differenc-es of each variety under different nitrogen supply conditions.The clustering analysis results indicate that Xianyu 335,Xinyu 108,and Kehe 699 are high-yield varieties.Xianyu 335 and Kehe 699 are both double efficient varieties at two different densities.Xinyu 108 is a high nitrogen efficient variety at a planting density of 6×104 plants/hm2,and a double efficient variety at a planting density of 9×104 plants/hm2.When the planting density is 9×104 plants/hm2,the average yield of the double efficient variety reaches its maximum value(14.5 t/hm2),with an average increase of 13.7%to 18.7%compared to other varieties.Therefore,in the irrigation area of the Xiliaohe plain irrigation area,planting high-yield and nitrogen efficient varieties such as Xianyu 335 and Kehe 699 under a nitrogen application rate of 270 kg/hm2 and density of 9×104 plants/hm2,and implementing reasonable field management can achieve high and stable yields as well as cost savings and increased efficiency.