不同浮板形式对静止浮板水培叶用莴苣生长的影响

Effects of different floating plate types on lettuce cultivated by floating hydroponics technique

研究了不同浮板形式对静止浮板水培叶用莴苣(Lactuca sativa L.)生长的影响,结果表明,使用上、下厚度均为2cm的双层浮板栽培叶用莴苣效果最好。其株型较大,株高26.72cm,开展度32.15cm,茎粗10.90mm,叶片数9.81片,叶长23.56cm,叶宽14.63cm,叶面积229.78cm^2,根体积9.54cm^3;生物积累量高,冠鲜质量为47.51g,根鲜质量9.48g,总鲜质量56.99g,冠干质量3.0370g,根干质量0.9353g,总干质量3.9723g;营养品质与常规灯芯式深水培相近。因此,进行叶用莴苣静止浮板水培,可以使用上层厚2cm,定植孔直径2cm,下层厚2cm,定植孔直径5cm的双层浮板。

The effects of different floating plate types on lettuce(Lactuca sativa L.)cultivated by floating hydroponics technique were studied.The results showed that the effects of the double-layer floating plate with the upper and lower thickness of 2 cm of lettuce was the best.The plant shape was large.It’s plant height was 26.72 cm,plant width was 32.15 cm,stem diameter was 10.90 mm,leaf number was 9.81,leaf length was 23.56 cm,leaf width was 14.63 cm,leaf area was 229.78 cm^2,and root volume was 9.54 cm^3.The biomass was high.It’s fresh mass of crown was 47.51 g,fresh mass of root was 9.48 g,total fresh mass was 56.99 g,dry mass of crown was 3.037 0 g,root dry mass was 0.935 3 g,total dry mass was 3.972 3 g.The nutritional quality was similar to that of conventional lamp core.Therefore,the double-deck floating plate that comprised two pieces polystyrene foam plastics plates,one piece’s thickness was 2 cm and the fixed holes diameter was 2 cm,the other piece’s thickness was 2 cm and the diameter of planting hole was 5 cm,can be used for hydroponics of leaf lettuce.