以登海618为试材,常规等行距种植方式为对照,设置不同种植密度、宽窄行种植、行间错位,比较研究宽行窄幅错位密播种植方式对夏玉米光合特性及产量的影响。结果表明,宽行窄幅错位密播种植方式下夏玉米叶面积指数和群体干物质积累量随着种植密度的增加而增加,叶片净光合速率逐渐降低;与对照相比,密度为86 625、101 055株/hm~2时叶片后期衰老缓慢,维持较高净光合速率的时间较长,花后群体干物质积累较多,各器官干物质运转率和对子粒贡献率较高。Richards模型解析表明,宽行窄幅错位密播种植方式下密度为86 625、101 055株/hm~2时达最大灌浆速率的时间较早,起始势和最大灌浆速率较高,子粒灌浆活跃期和灌浆速率最大时的生长量均偏低,植株空秆率较低,分别比对照显著增产5.61%、12.29%。密度为101 055株/hm~2时穗长、穗粗、行粒数、百粒重、穗粒重均比对照偏低,较高的有效收获穗数足以弥补劣势,使子粒获得高产。 Taking Denghai 618 as test material and conventional planting method as control, the planting density and width-width rows were planted with different widths and widths. The effects of wide-width, narrow-width and in-depth planting modes on photosynthetic characteristics and yield of summer maize were compared. The results showed that leaf area index and population dry matter accumulation of summer maize increased with planting density and the net photosynthetic rate of the leaves decreased gradually under the narrow width misplacing planting mode. Compared with the control, the density was 86 625, At the rate of 101 055 plants / hm ~ 2, leaf late senescence was slow, maintaining high net photosynthetic rate for a long time, more post-anthesis population dry matter accumulation, higher dry matter turnover rates and higher contribution rate to the seeds. The Richards model analysis showed that the maximum filling rate at 86 625,101 055 plants / hm ~ 2 was earlier, the initial potential and maximum filling rate were higher, and the grain filling was active The growth rate at the maximum and filling rate was low, and the empty stalk rate of the plants was low, which increased by 5.61% and 12.29% compared with the control respectively. At the density of 101 055 plants / hm ~ 2, ear length, ear diameter, grain number per line, grain weight per head and grain weight per ear were all lower than those of the control. The higher effective harvesting spike was enough to make up for the disadvantage and make the grain yield high.