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为探究水氮互作对青贮玉米(Zea may)产量、青贮后营养品质和发酵质量的影响，提高青贮玉米综合利用价值，以青贮玉米国审品种北农青贮368为试验材料，在田间条件下设置传统灌溉量(2 250 m3·hm−2, W1)、节水10% (2 025 m3·hm−2, W2)和节水20% (1 800 m3·hm−2, W3) 3个灌溉水平；传统施氮量(420 kg·hm−2, N1)、减氮10% (378 kg·hm−2, N2 )和减氮20% (336 kg·hm−2, N3) 3个施氮水平，对青贮玉米产量、青贮料的营养品质和发酵效果比较分析，并对相对饲用价值进行评价。结果表明：灌水量为2 025 m3·hm−2、施氮量为378 kg·hm−2 (W2N2)的组合青贮玉米干物质产量最高(22.78 t·hm−2)，与传统水肥用量(W1N1)相比增产5.02%，水氮互作对青贮玉米干物质产量影响显著(P < 0.05)。青贮料经袋式青贮周年保存后， W1N1、W2N2和W2N3处理干物质损失率均低于1.0%。不同水氮处理对青贮后中性洗涤纤维、酸性洗涤纤维、淀粉和粗灰分含量影响显著(P < 0.05)，对粗脂肪含量影响不大。经长期保存的青贮料pH稳定在4.0左右，相对饲用价值为136.04～164.35，乳酸含量为3.33%～4.34%，乙酸含量为1.63%～2.29%。节水减氮处理不同程度提高了乳酸含量，其中W2N2处理乳酸含量最高。W2N2和W3N3处理的乙酸含量显著低于其他处理(P < 0.05)。综合青贮玉米产量、干物质含量损失率和青贮品质等参数，本研究条件下理想水氮处理为W2N2，在该处理下可获得较高的产量和较好的青贮品质。“,”This research was conducted to investigate the effect of combining water and nitrogen supplementation on yield, nutritional value, and silage quality of silage maize (Zea may, improving its comprehensive utilization value. The silage maize hybrid cultivar Beinong silage 368 was used as experimental material. The experimental design included three water irrigation application rates, i.e., 2 250, 2 025, and 1 800 m3·ha−1 (designated as W1, W2, and W3, respectively), and three nitrogen application rates, i.e., 420, 378, and 336 kg·ha−1 (designated as N1, N2, and N3, respectively). The results showed that the highest yields of silage maize were obtained when W2 and N2 treatments were combined; this yield was 5.02% higher than that obtained with the traditional water and fertilizer application volumes (W1N1). The dry matter loss rate of silage resulting from W1N1, W2N2, or W2N3 treatments was less than 1.0% after a year. However, there were significant differences in neutral and acid detergent fiber content, starch content, and crude ash of whole maize plants between treatments (P < 0.05) but not in ether extract concentration. After the first anniversary, the pH of the maize silage was stable at about 4.0, its relative feed value was 136.04 ~ 164.35, and its lactic and acetic acid contents were 3.33 ~ 4.34% and 1.63% ~ 2.29%, respectively. The lactic acid content resulting from the treatments was higher than that of W1N1, and the acetic acid content resulting from W2N2 and W3N3 treatments was significantly lower than that from other treatments (P < 0.05). In conclusion, considering the yield, dry matter content loss rate, and silage quality, W2N2 was the best treatment for producing high quality silage.