【摘要】 通过对浚单20玉米新品种进行分期播种试验,研究不同播期对浚单20各个阶段生长状况及产量形成的影响。首先对各播期发育阶段持续日数进行差异性检验,结果表明,夏玉米全生育期日数随播期推迟而缩短。其次,分析了作物各发育期持续日数与各气象要素的关系:在一定的范围内,温度升高可以促进夏玉米生长,日照减少可加快夏玉米生育进程,不同生育阶段降水量对作物生长影响不同,其中抽雄-乳熟期降水量增加能缩短发育日数。然后,对比分析了播期对浚单20干物质及产量形成的影响:随着播期推迟,穗长有缩短趋势,单株籽粒重、百粒重、籽粒与茎秆比也随播期的推迟呈下降趋势;播期一平均实产达864.12 g/m2,比播期二高74.56 g/m2,比播期三高128.33 g/m2,在一定程度上说明浚单20适时早播,有助于产量提高。更多还原

【Abstract】 A field experiment was carried out in Hebi to study the effects of different sowing date on the growth and development and yield formation of summer maize Xundan 20.Firstly,the sowing date different was tested on the sustained days in different growth stages,the results showed the day numbers in whole growth stage of summer maize was shortened with the sowing date delayed.Secondly,the relation between the meteorological condition and the sustained days in different growth stages of summer maize was analyzed.In a certain range,the growth of summer maize would speed up with temperature increasing and sunlight decreasing.The day numbers in tasseling-milk ripeness stage was shortened with precipitation increasing.Then,the dry matter and yield formation of Xundan 20 in different sowing dates were analyzed.The spike length was shortened with the sowing date delayed.The seed weight pre plant,100-seed weight and the proportion of seed and stem was decreasing by sowing date delayed.In the first sowing stage,the yield reached 864.12 g/m2,it was 74.56 g/m2 higher than the second and 128.33 g/m2 higher than the third sowing stage.To some extent,the Xundan 20 could obtain high yield when sowing earlier.更多还原