CAJ | 학술논문

以郑单958、先玉335和中单909这3个主栽夏玉米品种为材料，研究了5个密度梯度下三品种的产量、产量性状、叶面积指数、叶面积持续期及与密度的相关性。结果表明：在6～9万株/hm2密度内，随密度的增加，穗长、穗粒数、百粒质量和穗重呈降低趋势；群体的叶面积指数和叶面积持续期增大，与密度呈正相关关系，密度的增加提高了群体的光合能力；产量方面以先玉335平均产量最高，其次为中单909，郑单958最低。郑单958和先玉335的产量和密度呈线性关系，中单909的产量呈先升后降趋势，符合二次曲线关系。郑单958产量与叶面积指数和叶面积持续期的回归关系好，斜率最大，随密度增加产量增加幅度较大，穗性状降低的幅度小，耐密性好；先玉335和中单909的产量与叶面积指数和叶面积持续期回归斜率小于郑单958，先玉335随密度的增加产量增加幅度小，适合相对稀植；中单909的适密范围在8．56万株/hm2左右。因此，应根据品种的特性进行合理密植，才能充分发挥品种的光合特性，提高作物产量。
이정단958、선옥335화중단909저3개주재하옥미품충위재료，연구료5개밀도제도하삼품충적산량、산량성상、협면적지수、협면적지속기급여밀도적상관성。결과표명：재6～9만주/hm2밀도내，수밀도적증가，수장、수립수、백립질량화수중정강저추세；군체적협면적지수화협면적지속기증대，여밀도정정상관관계，밀도적증가제고료군체적광합능력；산량방면이선옥335평균산량최고，기차위중단909，정단958최저。정단958화선옥335적산량화밀도정선성관계，중단909적산량정선승후강추세，부합이차곡선관계。정단958산량여협면적지수화협면적지속기적회귀관계호，사솔최대，수밀도증가산량증가폭도교대，수성상강저적폭도소，내밀성호；선옥335화중단909적산량여협면적지수화협면적지속기회귀사솔소우정단958，선옥335수밀도적증가산량증가폭도소，괄합상대희식；중단909적괄밀범위재8．56만주/hm2좌우。인차，응근거품충적특성진행합리밀식，재능충분발휘품충적광합특성，제고작물산량。
In this study ,by using three widely-cultivated summer corn varieties ( Zhengdan 958 ,Xianyu 335 and Zhongdan 909 ),the leaf area index(LAI),leaf area duration(LAD),yield and yield traits responses to planting density were studied under five density levels .The results indicated that:in the range of 6-9 ×104 plants/ha,the spike lengths ,number of grains per spike ,100-kernel weight and per spike kernel weight decreased while the LAI and LAD increased and positively correlated with the increase in plant density .The increased plant density also pro-moted the population photosynthetic intensity .As to yield, Xianyu 335 had the highest average yield , next was Zhongdan 909 and the lowest was Zhengdan 958 .The Zhengdan 958 and Xianyu 335 varieties presented linear while the Zhongdan 909 a parabolic relationship with plant density .The yield of Zhengdan 958 was highly correlated with LAI and LAD,and the amount of yield increase was greater than the other two varieties for same density increment , and showed less spike traits reduction ,so it has good density tolerance .The slopes of the linear correlation of Xianyu 335 and Zhongdan 909 with plant density were smaller than that of Zhengdan 958 .The amount of yield increase was less for same density increment for Xianyu 335,thus it suits for lower plant density .While for Zhengdan 909,it had an optimum density of around 8.56 ×104 plants/ha.So adopting a reasonable intensified planting density in accord-ance with variety traits can improve crop yield and gives full play to the characteristics of corn varieties .