【作者】 陈尚洪； 陈红琳； 沈学善； 王昌桃； 张玉兰； 刘定辉；

【Author】 Chen Shang-hong~1 Chen Hong-lin~1 Shen Xue-shan~1 Wang Chang-tao~1 Zhang Yu-lan~3 Liu Ding-hui~(1,2) (1.Soil and Fertilizer Institute,Sichuan Academy of Agricultural Sciences,Chengdu 610066,China 2.Sichuan agricultural university,Ya ’an 625014,China 3.National Institute of Measurement and Testing Technology,Chengdu 610021,China )

【机构】 四川省农业科学院土壤肥料研究所； 中国测试技术研究院； 四川农业大学；

【摘要】 设置3个密度和3个施氮量处理,通过田间试验研究不同密度和氮肥用量对四川丘陵区机播夏玉米生长特征、产量及倒伏影响。结果表明,密度是影响玉米生长、产量和倒伏的主要因素。营养生长阶段玉米株高、抽雄吐丝期叶面积指数、群体生物量和有效穗随密度增加而增加,密度达7500株·hm^-2提高穗着粒、百粒重、空秆率,降低穗长、结实长、穗粗、行数、行粒数、。当密度为6000株·hm^-2,施氮量375kg·hm^-2能获得最佳产量。夏玉米倒伏以茎折为主,茎折多发生在受密度和施氮量显著影响的基部第5节和第6节,密度为6000株·hm^-2且施氮量375·hm^-2能降低总倒伏率。更多还原

【Abstract】 Field experiment was carried on effects of planting density and application levels of nitrogen fertilizer on growth characteristics,yield and lodging of mechanized sowing summer maize in Sichuan hilly area.The results showed that growth characteristics,yield and lodging were significant correlated with density.The ear height during Vegetative growth stage,leaf area index in the stamen-growing stage,population biomass,effective panicle number were followed by an increasing trend respectively with the density increasing.Under density of 7500 plants per hm2,the plant barren ratio increased,and number of gain ear, 100-kernel weight,ear length,length of bearing kernel,ear diameter,rows per ear,kernels per row,were reduced compared with 4500 plants per hm2 and 6000 plants per hm2.The yield reached a optimum when planting density was 6000 plants per hm2 and nitrogen application was 375 kg·hm2.Stalk breaking is the major form of lodging of summer maize,and it happened between internodes from bottom 5rd to 6th which significantly effected by density and application levels of nitrogen.The treatment with density of 6000 plants per hm2 and nitrogen application of 375 kg·hm2 reduced root lodging percentage and stalk breaking percentage of summer maize.更多还原