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| Nutrient characteristics and cropland utilization suitability of biogas slurry from large-scale pig farms in Zhejiang Province,China |
| Received:July 25, 2018 |
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| KeyWord:large-scale pig farm;biogas residues and slurry;nutrients |
| Author Name | Affiliation | | WANG Qiang | Institute of Environmental Resources and Soil Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China | | LIU Yin-xiu | Office of Zhejiang Provincial Agriculture Ecology and Energy, Hangzhou 310012, China | | BIAN Wu-ying | Cultivated Land Quality and Fertilizer Administration of Zhejiang, Hangzhou 310020, China | | NIE Xin-jun | Office of Zhejiang Provincial Agriculture Ecology and Energy, Hangzhou 310012, China | | JIN Juan | Office of Zhejiang Provincial Agriculture Ecology and Energy, Hangzhou 310012, China | | CHEN Zhao-ming | Institute of Environmental Resources and Soil Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China |
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| Abstract: |
| The aim of this study is to clarify the nutrient characteristics of biogas slurry (BS) from large-scale pig farms and to promote the rational use of BS in farming systems. BS samples were collected from 62 large-scale pig farms in Zhejiang Province in May and August 2016, and their pH, total organic carbon (TOC), total phosphorus (TP), total potassium (TK), total salt (TS), and ammonium-N levels were measured. The results showed that the average pH, TOC, TP, TK, and TS of the pig BS were 7.39 and 7.47, 5.01 and 4.79 g·L-1, 0.34 and 0.47 g·L-1, 0.57 and 0.81 g·L-1, and 3.06 and 1.76 g·L-1 in May and August, respectively. Ammonium-N was the main form of N in the BS. The mean ammonium-N was 689.2 and 1 235.5 mg·L-1 in May and August, respectively, which accounted for 69.6% and 81.2% of total nitrogen in the BS. The variable coefficient of TOC was 126.2% and 182.1% in May and August, respectively, and those of TP were 86.7% and 222.6%. The variable extents of TN, TK, ammonium, and TS ranged from 44.5%~87.8%. No significant differences in the nutrients were observed among the regions. However, there were significant differences between sampling times. Ammonium of BS was significantly correlated with TN,TOC, TP, TK, and TS. The main nutrient concentrations (N + P2O5 + K2O) were 1.91 and 2.81 g·L-1 in May and August, respectively. The N:P2O5:K2O was 1:0.31:0.60 and 1:0.35:0.59 in May and August, respectively. Significant relationships were observed among the nutrients in the slurry. The N:P:K ratio in the BS was similar to the crop demand in the field. The application rate of BS could be confirmed according to the ammonium-N concentration in the BS when it was applied in farming systems. |
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