种植密度对松玉419群体生理特性及产量的影响

The Effect of Plant Density on the Population Physiological Characters and Yield of Maize Songyu 419

为了明确松玉419在吉林省中部半湿润地区的合理栽培密度,在大田条件下设置了5万、5.6万、6.3万、7.2万和8.3万株/hm2共5个密度,研究不同种植密度下,松玉419的群体生理指标、产量及产量性状。结果表明,随着种植密度增加,叶绿素相对含量降低,群体光合势增加,群体干物质积累量呈先升高后降低的趋势,但单株干物质积累则呈现降低趋势。玉米群体和个体的产量性状相对较为协调的种植密度为6.3万株/hm2,产量可达12 820.5 kg/hm2。

To find the rational planting density of new variety Maize Songyu 419 insemi-humid zones of Jilin Prov- ince, field experiment was carried out. Five planting densities were designed, which were 50 000, 56 000, 63 000, 72 000, and 83 000 plants / ha. Under the different planting densities, the population physiological characters, yield and yield traits of Songyu 419 were researched. The result showed that the relativechlorophyll content and single dry matter weight decreased and population photosynthesis potential increased as planting densityincreased. Population dry weight as well as the yield showed a curve of first increase and later drop. It is suggested that the high yield of Songyu 419 had earned in planting density 63 000 plants/ha and the yield reaches 12 820.5 kg/ha.