CAJ | 학술논문

　　研究了种植密度对夏播玉米（CF008、郑单958和金海5号）冠层、产量及水氮利用效率的影响，通过密度调控，构建高效冠层，发挥品种潜力，实现高产和高水氮效率同时提高。结果表明，低中密度条件下冠层结构合理，穗位层透光率较高，植株LAI发展符合中稳、后衰慢的动态，穗粒数和产量较高。耗水量随密度增加而增加，而水分利用率（WUE）随密度增加而先升后降，为中密度下较高。地上部总氮量、氮素吸收效率和氮肥利用率与种植密度并不呈正比，3个品种夏玉米各项氮效率指标均为低或中密度处理较高。可见，适当增加种植密度可以提高产量和水氮利用效率，但密度增加有一定的上限范围，过高反而不利于产量和水氮效率的提高。
　　연구료충식밀도대하파옥미（CF008、정단958화금해5호）관층、산량급수담이용효솔적영향，통과밀도조공，구건고효관층，발휘품충잠력，실현고산화고수담효솔동시제고。결과표명，저중밀도조건하관층결구합리，수위층투광솔교고，식주LAI발전부합중은、후쇠만적동태，수립수화산량교고。모수량수밀도증가이증가，이수분이용솔（WUE）수밀도증가이선승후강，위중밀도하교고。지상부총담량、담소흡수효솔화담비이용솔여충식밀도병불정정비，3개품충하옥미각항담효솔지표균위저혹중밀도처리교고。가견，괄당증가충식밀도가이제고산량화수담이용효솔，단밀도증가유일정적상한범위，과고반이불리우산량화수담효솔적제고。
The experiment was employed with main plot of plant density (low,medium,and high respectively), sub-plot of cultivar(CF008,Zhengdan 958,Jinhai 5 respectively),studied the effect of different density on canopy structure,yield,water use efficiency(WUE) and recovery of N fertilizer(RNF).The objective to obtain high yield , high water and N efficiency simultaneously through regulating canopy structure under suitable planting density .The main results showed that the high-yielding canopy structure was obtained under both low and medium densities of the three cultivars.Percent transmission of ear layer leaf was high ,and LAI developmental dynamic were rational , and grain yield and grain number per ear were high because of the even light distribution within canopy under both low and medium densities.Water consumption increased with the increase in density ,but WUE was higher under medium density.Shoot N,N uptake efficiency(NUPE),N use efficiency(NUE),and RNF were significantly higher under low or medium densities for three cultivars .Our results confirmed that proper higher planting density can in-crease grain yield and efficiency of water and N ,and proper planting density of CF008,Zhengdan 958 and Jinhai 5 were below 11.25 ×10 4 ,9.75 ×104 ,8.25 ×104 plants/ha respectively.