不同氮源海藻肥对无土栽培生菜生长及品质的影响

本研究用海带浸泡液复配酰胺态氮、植物氨基酸粉、鱼蛋白三种氮源制成肥料,分别探讨了不同稀释度对生菜生长及品质的影响。结果表明:与改良霍格兰配方对比,氨基酸粉海藻肥稀释倍数为3000 倍时,生菜鲜重、叶绿素、还原糖、蛋白含量分别增加23.21%、4.21%、35.48%、35.71%,硝酸盐含量降低了60.31%;鱼蛋白海藻肥稀释倍数为2000 倍时,生菜鲜重、叶绿素、还原糖、蛋白含量分别增加21.94%、14.81%、15.21%、24.85%,硝酸盐含量降低了57.96%;酰胺态氮(尿素)海藻肥稀释倍数为1800 倍时,生菜鲜重、还原糖、蛋白含量分别增加15.25%、16.31%、8.33%,硝酸盐和叶绿素含量分别降低了2.10%、15.09%。研究结果表明氨基酸粉海藻肥最适宜作为生菜无土栽培的有机肥。

Effects of different nitrogen source seaweed fertilizers on the growth and quality of lettuce in soilless culture

In this study,the effects of different dilutions on the growth and quality of lettuce were discussed by using the three kinds of nitrogen sources,such as amide nitrogen,plant amino acid powder and fish protein. The results showed that the fresh weight,chlorophyll,reducing sugar and protein content of lettuce were increased by 23.21%,4.21%,35.48% and 35.71%,respectively,compared with the modified hoagland formula when the dilution ratio of amino acid powder seaweed was 3000 times,and the nitrate content reduced by 60.31%. When the dilution ratio of fish protein seaweed fertilizer was 2000 times,the contents of fresh weight,chlorophyll,reducing sugar and protein were increased by 21.94%,14.81%,15.21% and 24.85% respectively,and the content of nitrate decreased by 57.96%. When the the dilution ratio of amide nitrogen(urea)seaweed fertilizer was 1800 times,the fresh weight,reducing sugar and protein content of lettuce were increased by 15.25%,16.31% and 8.33% respectively,and the contents of nitrate and chlorophyll decreased by 2.10% and 15.09% respectively. The results showed that amino acid powder seaweed fertilizer was the most suitable for lettuce cultivation of organic fertilizer.