To provide theoretical and technical basis for the scientific application of nitrogen(N)and potassium(K)fertilizer in wheat crop-ping in Huaibei lime concretion black soil area, a field experiment was performed to study the effects of different N and K treatments(N:180, 240, 300, 360 kg·hm-2;K:90, 135, 180 kg·hm-2)on wheat yields, absorption of N and K, and fertilizer benefits. The results showed that:(1) The wheat yield under application of N240 K180 reached 7686 kg·hm-2, which was significantly increased by 7.24%comparing with that under N180 K90, and there was no significant differences between the yields under N240 K180 and N360 K180;(2)Compared with the contents of N and K in wheat under N180 K90, those under N240 K180 were significantly increased by 14.67%and 29.53%, respectively;(3)There was a positive interac-tion between the application of N and K fertilizer, and the interaction was significantly correlated with wheat yield at a contribution rate of 14.06%, which consequently increased the partial productivities of N and K fertilizer. Considering wheat yield and fertilizer benefit, the opti-mum application amounts of N and K2O fertilizer were 240 kg·hm-2和180 kg·hm-2 in Huaibei lime concretion black soil area.%为给淮北砂姜黑土区小麦生产中氮、钾肥的科学施用提供理论与技术依据,采用田间试验研究了不同氮、钾水平(N:180、240、300、360 kg·hm-2;K:90、135、180 kg·hm-2)对小麦产量、氮钾养分吸收利用以及肥料效益的影响.结果表明:(1)N240K180处理下小麦产量为7686 kg·hm-2,比低氮低钾(N180K90)处理的小麦产量显著提高7.24%,与高氮高钾(N360K180)处理的小麦产量无显著性差异;(2)氮、钾肥配比施用时两者存在正交互作用,该交互作用与小麦产量呈极显著正相关,对产量的贡献率为14.06%,且提高了氮、钾肥的偏生产力;(3)与低氮低钾(N180 K90)处理相比,N240 K180处理下小麦植株体内氮、钾素含量分别提高14.67%和29.53%.综合考虑小麦产量和肥料效益,本研究条件下淮北砂姜黑土区适宜的氮(N)、钾(K2O)肥施用量分别为240 kg·hm-2和180 kg·hm-2.
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