不同季节水培生菜适宜定植密度的研究

Study on the Suitable Planting Density of Hydroponic Lettuce in Different Seasons

为研究北京地区不同季节水培生菜适宜的定植密度,以生菜"富兰德里"为试材,4月及7月在深液流漂浮板栽培模式下分别设置6个不同定植密度(20、25、30、35、40、45株/m^2),研究其对生菜产量和品质的影响。结果表明:4月平均温度为18.5℃,定植密度25株/m^2(CK)条件下产量最高,可达4.5 kg/m^2,VC、可溶性糖含量较高;7月平均温度为25.8℃,定植密度为30株/m^2时植株长势较强,产量最高,可达4.2 kg/m^2,较对照增产5.0%,且品质与对照无显著性差异。因此,建议春秋季节定植密度为25株/m^2,夏季高温定植密度为30株/m^2,可节省种子及用工成本,获得较高经济效益。

In order to study the suitable planting density of hydroponic lettuce in different seasons in Beijing,"Flandria"was used as the test material,and different planting densities(20,25,30,35,40,45 plants/m^2)were set in April and July in the deep-flow floating plate cultivation mode,respectively.The effects of different densities on the yield and quality of lettuce were studied.The results showed that when the average temperature was 18.5℃in April,the yield was the highest under the control density of 25 plants/m^2,reaching 4.5 kg/m^2,and the content of VC and soluble sugar were higher.When the average temperature was 25.8℃in July and the planting density was 30 plants/m^2,the plant growth was stronger and the yield was the highest,reaching 4.2 kg/m^2,which was 5.0%higher than that of the control,and the quality had no significant difference with the control.Therefore,it was suggested that the planting density should be 25 plants/m^2 in spring and autumn and 30 plants/m^2 in summer,so that it could save the cost of seed and labor and obtain higher economic benefits.