【摘要】 为了保障粮食生产安全,合理安排农业生产,有效利用热量资源为防灾减灾服务,通过玉米分期播种试验,研究玉米播种出苗热量指标和适宜播种期。运用数理统计方法对试验数据进行整理分析。结果表明:辽宁西部地区玉米春季播种初始日平均气温为12.0℃,适宜日平均气温为15.0~20.0℃;玉米播种至出苗需要≥12.0℃有效积温最低为55.0℃·d,适宜有效积温为60~90℃·d;随着日平均气温的升高出苗速度加快,当日平均气温在20.0℃以上时,玉米出苗速度最快为7d。辽宁西部地区玉米适宜播种期在4月25日至5月5日之间,可减少95%终霜冻的危害。研究结果可为农业结构调整,合理安排玉米生产提供科学依据。更多还原

【Abstract】 In order to ensure safety of grain production,and arrange the agricultural production reasonable,and using the heat resource service for disaster prevention and mitigation effectively,we researched thecorn seed emergence heat index and suitable seeding time by maize sowing experiments. We used themathematical statistical method to analyze the experimental data. The result shows that:the average tempera-ture of spring maize planting initial day in Liaoning western region is 12.0℃,and appropriate daily averagetemperature is 15.0℃~20.0℃;corn need greater than temperature of 12℃ from sowing to emergence,andthe minimum effective accumulated temperature is 55.0℃·d,appropriate effective accumulated temperatureis 60~90℃·d;Maize emergence speed will speed up with the increase of daily average temperature,thefastest time of maize emergence will be 7 days,if the average temperature is above 20.0℃. Corn suitableseeding time in Liaoning western region is between April 25 and May 5,which can reduce 95% frost dam-age. Our research results can provide a scientific basis for agricultural structure adjustment and arrangecorn production reasonable.更多还原