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| DOI： |
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| Effect of Biogas Slurry on Photosynthesis, Yield and Quality of Lettuce Grown in Hydroponic Culture |
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YANG Xin, WANG Wen’e, HU Xiaotao, LI Xingjie, SU Yuanjun
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Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A & F University, Yangling 712100, China
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| Abstract: |
| We investigated the impact of replacing part of the nutrient solution by biogas slurry on yield, quality and photosynthesis of lettuce grown in hydroponic culture at different growing stages using deep flow technique (DFT). The relationship between chlorophyll-a and photosynthetic parameters was also analyzed. The results showed that the lettuce yield increased significantly after partially substituting the nutrient solution by biogas slurry (P<0.05), and this is consistent in all growth stages. The yield peaked when 20% of nutrient solution was substituted by biogas slurry during the second growth stage and 40% during the last growth stage, with the yield increasing by 66.97% compared with the CK (no biogas slurry). Substituting the nutrient solution by biogas slurry substantially increased the soluble sugar compared with the CK (P<0.01), but there was not noticeable change in the soluble proteins. It was also found that biogas slurry reduced the amount of nitrate, decreased the vitamin C, enhanced chlorophyll-a in the lettuce, as well as promoted the photosynthesis. In summary, substituting part of the nutrient solution by biogas slurry in second growth stage of the lettuce grown in hydrophobic culture increased its yield, quality and photosynthesis, with 40% of the medium substituted by biogas slurry most optimal. |
| Key words: biogas slurry; hydroponic lettuce; growth stages; yield; quality; photosynthetic characteristics |
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