【摘要】 【目的】本研究旨在明确川中丘陵区小麦/玉米轮作制度下使用稳定性尿素对作物产量、氮素吸收及氮效率的影响。【方法】设置6个处理:无氮肥（CK）、普通尿素1次施用(UB_100%)、普通尿素2次施用(UD_100%)、稳定性尿素1次施用(DMPP_100%)、75%普通尿素2次施用(UD_75%)和75%稳定性尿素1次施用(DMPP_75%)。【结果】与UD_100%处理相比,DMPP_100%的周年作物产量增加3.99%;周年氮肥表观利用率提高9.09个百分点,其中小麦季提高7.59个百分点,玉米季提高9.76个百分点;周年作物吸氮量提高20.22%,其中小麦季提高14.34%,玉米季提高23.62%。稳定性尿素处理在作物生长前期的土壤中硝态氮浓度低于普通尿素处理,而在小麦/玉米生长中后期（开花期以后）的植株吸氮量高于普通尿素处理。【结论】在本试验条件下,合理施用稳定性尿素,既可保障作物产量,又可提高作物生长中后期的氮素吸收量和氮肥利用率。更多还原

【Abstract】 【Objective】The present study was used to determine the effects of stabilized urea on crop yield,soil nitrogen supply capacity,crop nitrogen uptake and nitrogen efficiency of wheat-maize rotation system in Central Sichuan Basin. 【Method】There were six experimental treatments including no nitrogen（ CK）,single basal application of urea( UB_{100 %}),conventional urea treatment( UD_{100 %}),nitrification inhibitor treated urea( DMPP_{100 %}),reduced rate of conventional urea treatment( UD_{75 %}) and reduced rate of nitrification inhibitor treated urea( DMPP_{75 %}).【Result】The annual yield of total nitrification inhibitor treated urea( DMPP_{100 %}) was 3. 99 % higher than that of conventional urea treatment( UD_{100 %}). The annual apparent nitrogen recovery of DMPP100 %was 9. 09 percentage points higher than UD_{100 %},an increase of 7. 59 percentage point in wheat season and 9. 76 percentage point in maize season. The annual nitrogen uptake under DMPP_{100 %} treatment was 20. 22 % higher than that of UD_{100 %} treatment,14. 34 % higher in wheat season and 23. 62 % higher in maize season. The nitrate concentration of the DMPP treated soil was lower than the urea treated soil in the prophase of crop growth. The plant nitrogen uptake was higher in plants receiving DMPP_{100 %} than urea in the later stages of wheat and maize growth（ after florescence）. 【Conclusion】As in this case,use of the stabilized urea can produce good crop yield,and increase nitrogen acquisition of crops to enhance N fertilizer use efficiency in late growing stages.更多还原