麦茬直播播期对“绿旱1号”生长及产量的影响

摘要

By methods of field trials and randomized blocks design,the influences of sowing time by seedling-broadcast cultivation on growth and yield of Rice Lv Han No1 in the areas along Huaihe River had been studied.The result indicated that the plant height,biological yield,effective panicles number,actual grain number and economical yield all decreased with delay sowing time from May 25 to July 5.But the tendency of 1000-seed weight and economic coefficient ascend in first and descend at last.When the sowing date was put off,the yield were significantly decreased.Seeding before June 15,the yield compared with the treatment CK decreased the scope to be smaller;But Seeding after June 22,the yield Compared with the treatment CK decreased by 17.9%-43.9%.So it is very important to be sure to do the sowing in good time.It should be seeded before June 15 for Lv Han No 1 along the Huaihe River in the wheat stubble.Sowing in advance has remarkable effect on yield,to avoid sowing in June after 29.%采用大田随机区组设计研究了沿淮地区麦茬直播播期对＂绿旱1号＂生长及产量的影响。结果表明,在5月25日-7月5日范围内,随着播期的延迟,＂绿旱1号＂的株高、生物产量、有效穗数、穗实粒数及经济产量均降低,而千粒重、经济系数呈先升后降趋势;因播期推迟,导致减产均达到显著或极显著水平;但在6月15日之前播种的处理较对照减产幅度较小,6月22日以后播种的处理较对照减产幅度达17.9～43.9%。因此,＂绿旱1号＂在沿淮地区麦茬直播要尽可能在6月15日之前播种,提早播种对增加产量有显著效果,一定要避免在6月29日后播种。