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| Application of vegetable waste fermentation broth for regulating nitrate accumulation and vegetable growth in greenhouse soil |
| Received:July 09, 2018 Revised:September 27, 2018 |
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| KeyWord:greenhouse soil;fermentation;water soluble organic carbon;nitrate;mineral nutrients |
| Author Name | Affiliation | E-mail | | CHEN Si-qi | College of Municipal and Environmental Engineering, Shenyang Jianzhu University, Shenyang 110168, China
Institute of Applied Ecology, Chinese Academic of Sciences, Shenyang 110016, China | | | NIU Ming-fen | College of Municipal and Environmental Engineering, Shenyang Jianzhu University, Shenyang 110168, China | | | HUANG Bin | Institute of Applied Ecology, Chinese Academic of Sciences, Shenyang 110016, China | huangbin@iae.ac.cn |
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| Abstract: |
| In order to reduce the cost of nitrate accumulation control in greenhouse soil and broaden the utilization approach of vegetable waste, cabbage waste was fermented (at a ratio of 1:2.4 relative to water)under greenhouse conditions (15~30℃)in order to transform its organic components into water soluble carbon (SOC)and mobilize its mineral nutrients for regulating nitrate accumulation and vegetable growth in greenhouse soil. Results show that the pH was lowered to below 5.0 after 5 days of fermentation. The addition of magnesium oxide on day 18 increased the pH to just above 5.0 and promoted SOC formation. The fermentation stabilized after 30 days of treatment, with the fermentation broth SOC content around 10.0 g·kg-1 chemical oxygen demand (COD)and its C/N ratio above 40. SOC from the fermentation broth was very effective for nitrate removal through denitrification in a high-nitrate (502.0 mg·kg-1 N)greenhouse soil under anoxic incubation, with its nitrate removal effectiveness only 11.7% lower than that of sucrose. In the pot experiment using low-nitrate (49.9 mg·kg-1 N) and moderate-nitrate (164.3 mg·kg-1 N)greenhouse soils planted with lettuce, the two soils were both temporally saturated after two additions of diluted fermentation broth (in the early and middle growth periods). Low-dose application of fermentation broth with SOC at 90~180 mg·kg-1 COD slightly promoted nitrate accumulation in the low-nitrate soil, and moderate-dose application of fermentation broth with SOC at 360~720 mg·kg-1 COD significantly lowered nitrate accumulation (14.6%~33.2%)in the moderate-nitrate soil, but both increased the lettuce yield (4.8%~14.1%)and reduced the nitrate content (6.8%~33.2%). The fermentation treatment of vegetable waste with low control requirements can simultaneously utilize organic and mineral components of vegetable waste to regulate nitrate accumulation and vegetable growth in greenhouse soil and can improve the environmental quality of facility agriculture. |
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