猪场废水灌溉对土壤-夏玉米系统氮素分布的影响

通过田间小区试验,研究了猪场废水处理工艺中3个阶段出水(原水、厌氧水和仿生态塘水)与地下水1∶5混水和厌氧水不同灌溉量对土壤中矿质氮含量、夏玉米产量以及植株吸氮量的影响。结果表明:厌氧水不同灌溉量对各土层硝态氮和铵态氮含量影响差异较显著,而不同阶段出水混水灌溉对各土层硝态氮和铵态氮含量影响差异不显著;厌氧水不同灌溉量处理下玉米产量呈现中量厌氧水高量厌氧水低量厌氧水的趋势,不同处理阶段出水混水灌溉时,原水与地下水1∶5混水灌溉产量较其他处理高;仿生态塘混水灌溉玉米籽粒粗蛋白含量最高。建议适宜的猪场养殖废水厌氧出水灌水定额为500 m3/hm2,适宜的混水灌溉处理为仿生态塘水与地下水1∶5的配水比例。

Effects of irrigation with piggery waste water on the nitrogen distribution in the soil summer maize system

Piggery waste water is one of the main waste water resources for agricultural irrigation. A field experiment was conducted to investigate the effects of irrigation using different quotas of anaerobic waste water, as well as different mixed solutions at the ratio of 1∶5 with piggery waste water at the treatment stages in waste water treatment technology at the pigggery and underground water on the content of nitrate nitrogen and ammonia nitrogen in the soil, yield and plant nitrogen uptake of summer maize. The results showed that 1) The quota of anaerobic waste water had significant effect on the content of nitrate nitrogen and ammonia nitrogen in the soil, while different treatment stages of piggery waste water irrigation have little effect on the content of nitrate nitrogen and ammonia nitrogen in the soil; 2) the yield under different quota of anaerobic waste water irrigation followed by: medium quota>high quota>low quota, and the yield under T_(ori∶gw1∶5) treatment is higher compared with other treatment stages of piggery waste water irrigation; 3) the content of protein in the grain is the highest under the T_(eco:gw1:5) treatment. Therefore, it was suggested that appropriate irrigation quota of anaerobic waste water was 500 m~3/hm~2, appropriate mixed waste water for irrigation was eco-pond: groundwater 1∶5.