播期和种植密度对玉米新品种衡单6272穗部性状和产量的影响

The Effects of Sowing Date and Planting Density on the Panicle Traits and Yields of New Maize Variety Hengdan 6272

以衡单6272为试验材料,采用单因素试验设计,在冀中南地区设置了播期试验和密度试验,其中,播期设4个处理(6月12日、6月17日、6月22日和6月27日),种植密度设5个处理(55500、63 000、70 500、78 000和85 500株/hm2),研究不同播期和密度对衡单6272穗部性状、抗性和产量的影响。结果表明:随着播期的推迟,衡单6272穗长、穗粗、行粒数和千粒重均呈逐渐降低趋势,秃尖长度呈逐渐增加趋势,抗性呈减弱趋势,产量呈显著降低趋势;随着种植密度的增大,衡单6272穗长、穗粗、行粒数和千粒重均大体呈降低趋势,秃尖长度呈增加趋势,抗性呈减弱趋势,产量呈先增加后降低的变化趋势。在冀中南地区,衡单6272的适宜播期为6月12～17日,适宜种植密度为63000～70500株/hm2。

Taking Hengdan 6272 as the test material,the tests of sowing date and planting density were designed using the single factor experiment design,the effects of 4 sowing dates（June 12,June 17,June 22 and June 27） and 5 planting densities（55 500,63 000,70 500,78 000 and 85 500 plants/hm2） on the panicle traits,resistance and yields of Hengdan 6272 were studied in the central and southern part of Hebei Province.The results showed that with the delay of sowing date,the ear length,ear diameter,grain number per row and 1000-grain weight were gradually declined,bald tip length was gradually increased,the resistance was decreased and the yield was significantly decreased.With the increasing of planting density,the ear length,ear diameter,grain number per row and 1000-grain weight were all generally decreased,bald tip length was increased,the resistance was decreased and the yield was increased first and then decreased.It recommended that the suitable sowing date of Hengdan 6272 was June 12-17,the suitable planting density was 63 000-70 500 plants/hm2 in the central and southern part of Hebei Province.