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| Effects of Organic Carbon Fertilizer on Growth，Quality，and Metabolizing Enzymes Activities of Carbon and Nitrogen in Lettuce |
| LI Junpeng，CHEN Riyuan，LIU Houcheng，SONG Shiwei，SU Wei，SUN Guangwen* |
| （College of Horticulture，South China Agricultural University，Guangzhou 510642，Guangdong，China） |
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Abstract In order to explore the best foliar spraying concentration of organic carbon fertilizer in the application of hydroponic lettuce，the effect of foliar spraying of different concentrations of liquid organic carbon fertilizer on the growth，quality and activities of enzymes related to carbon and nitrogen metabolism of lettuce was studied by setting 1 600，1 200，800 and 400 times liquid concentration levels with bolting resistant lettuce as the test material，and spraying water as the control．The results showed that spraying liquid organic carbon fertilizer on leaves could promote the growth of lettuce in hydroponic cultivation，and improve the activities of enzymes related to carbon and nitrogen metabolism．Among them，1 200 times treatment had the best eff ect．The plant height，maximum leaf length，maximum leaf width，fresh and dry weight of shoot and root，total chlorophyll content，VC content，sucrose phosphate synthase（SPS）activity，nitrate reductase（NR）activity，glutamine synthase（GS）activity，glutamate dehydrogenase（GDH）activity，glutamate synthase（GOGAT）activity，and nitrogen accumulation in shoot of lettuce were signifi cantly higher than those of the control．
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Received: 23 May 2022
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