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通过田间试验比较了不同冬小麦夏玉米品种 (系 )之间氮营养效率的差异。结果表明 ,3个冬小麦品种 (系 )中 ,93132具有较高的基础产量 ,而农大 95对氮肥反应最为敏感 ;3个夏玉米品种 (系 )中 ,西玉 3号不仅具有较高的基础产量 ,而且对氮肥的反应较好。冬小麦夏玉米不同品种 (系 )间最佳产量和最佳施氮量有较大差异。从施肥经济效益分析 ,冬小麦以农大 95最佳 ,夏玉米以西玉 3号最高。在 180 kg.hm-2 施氮水平下 ,冬小麦农大 95和夏玉米西玉 3号氮肥利用率较其他品种 (系 )分别高 10 .5～ 11.0个百分点和 13.9～18.7个百分点 ,这说明选择氮高效作物品种 (系 )提高氮肥利用率有很大的潜力 ,是完全可行的
The differences of nitrogen nutrition efficiency among different summer wheat varieties (lines) were compared by field experiments. The results showed that among the three winter wheat cultivars (lines), 93132 had higher basic yield, while Nongda 95 was the most sensitive to nitrogenous fertilizer. Among the three summer maize varieties (lines), Xiyu No.3 not only had higher basic yield , But also better response to nitrogen fertilizer. The best yield and the best nitrogen application rate of winter wheat and summer maize were different among different varieties (lines). Economic benefits from fertilization analysis, the best winter wheat 95, summer maize Xiyu 3 highest. Under the nitrogen application rate of 180 kg · hm-2, the nitrogen use efficiency of Nongda 95 and Xiayuyu Xiyu No.3 was 10.5 ~ 11.0 percentage points and 13.9 ~ 18.7 percentage points higher than other varieties, indicating that the selection Nitrogen-efficient crop varieties (lines) have great potential to improve nitrogen use efficiency and are completely feasible