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在大田条件下,以3个玉米品种(丹玉39、原单29和龙单13)为试验材料,设置早、中、晚3个播种期,分析了2007—2008年不同播期3个玉米品种关键生育阶段特征及其对温度的响应.结果表明:从播种到出苗所需天数依次为早播(平均值为13d)>中播(平均值为11d)>晚播(平均值为8d);出苗阶段平均气温在18℃左右时的出苗速率最快,气温偏高或偏低都会降低出苗速率.3个玉米品种在苗期营养阶段生育期天数的差异不大且受温度影响较小;从穗期阶段开始,晚熟品种龙单13的生长速率提高,成熟天数明显缩短;3个品种在穗期和花粒期阶段生长天数均随温度的增加呈减少趋势.全生育期地上干物质积累速率、产量、百粒重均表现为丹玉39>原单29>龙单13.
Under field conditions, three maize varieties (Dan Yu 39, Yuandan 29 and Longdan 13) were used as experimental materials to set up three sowing dates early, middle and late. Three maize cultivars with different sowing dates from 2007 to 2008 The results showed that the number of days from sowing to emergence were as follows: early sowing (averaged 13d)> mid sowing (averaged 11d)> late sowing (averaged 8d); The germination rate was the fastest when the average temperature was around 18 ℃ in the seedling stage and the high or low temperature could reduce the seedling emergence rate.The difference of the number of days of three maize cultivars during the vegetative stage was not significant and was less affected by the temperature. At the beginning of the panicle stage, the growth rate of the late-maturing cultivar Longdan 13 increased and the number of mature days significantly shortened. The days of growth of the three cultivars at both the heading and the anthesis stage tended to decrease with the increase of temperature.The aboveground dry matter accumulation rate , Yield, one hundred weight showed Dan Yu 39> the original single 29> single Long 13.