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| DOI：10.13522/j.cnki.ggps.2017.12.009 |
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| The Impact of Nitrogen fertilizer and Irrigation with Piggery Wastewater on Nitrogen Mineralization |
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DU Zhenjie, LI Ping, CUI Erping, QIAO Dongmei, LIANG Zhijie, QI Xuebin
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Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China; Agriculture Water and Soil Environmental Field Science Research Station of Xinxiang City of Henan Province of CAAS, Xinxiang 453002, China; Key Laboratory of High Efficient and Safe Utilization of Agriculture Water Resources of CAAS , Xinxiang 453002, China
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| Abstract: |
| Nitrogen input into soil influences nitrogen cycling and is closely related to nitrogen use efficiency. A laboratory experiment was conducted in this paper to investigate the change in ammonium nitrogen (NH+4-N), nitrate nitrogen (NO-3-N) and total nitrogen (TN) in soil samples (0, 7, 14, 21, 28, 35 and 42 days) irrigated by piggery wastewater and clean water（running water）under conditions that the nitrogen input in all treatments were the same and that the nitrogen input in each treatment was set at a high level and a low level. The results showed that TN and NH+4-N gradually decreased over time under different treatments, while NO-3-N increased. At the end of the incubation, the content of TN, NH+4-N and NO-3-N in high N treatment was higher than those at low N treatment. The maximum TN content was in CKH treatment (clean water with high nitrogen), while the maximum contents of NH+4-N and NO-3-N were both in the PWH treatment (irrigating with piggery wastewater plus high nitrogen application). There was a significant difference in cumulative mineralized nitrogen among different treatments (P<0.05). The results also demonstrated that nitrogen input impacted cumulative mineralized nitrogen in two ways, and the cumulative mineralized nitrogen was the highest in the PWH treatment with a value of 59.69 mg/kg. The nitrogen mineralization rate decreased with the incubation time, and the nitrogen mineralization rate under piggery wastewater treatments were significantly higher than that under clean water treatments despite their different nitrogen managements. It is not difficult to conclude that the PWH treatment has the greatest nitrogen supplying capacity, due to the high microbial biomass and enzyme activity of nitrogen mineralization. |
| Key words: piggery wastewater; nitrogen fertilizer; nitrogen mineralization; soil micro-organism; enzyme activity |
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