...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nutrient Cycling in Agroecosystems >Nitrogen mass balance in fields irrigated with liquid swine waste
【24h】

Nitrogen mass balance in fields irrigated with liquid swine waste

机译：液态猪粪灌溉田间的氮素质量平衡

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Over the past 15-years,swine-producing confined animal feeding operations (CAFOs) have proliferated throughout the Southeastern United States,particularly in North Carolina.Waste at these facilities is collected in open-air lagoons and the liquid phase is land-applied as fertilizer by sprinkler irrigation.Numerous investigations have focused on individual aspects of the fate of nitrogenous liquid waste,but none has attempted a comprehensive analysis of post-application transformations and losses.On three occasions,we experimentally applied liquid swine waste at typical industry doses of 1.2 and 2.5 cm-ha (40-130 kg N ha-1) to carefully defined plots in an active spray field on a representative North Carolina CAFO and constructed a nitrogen mass balance for the waste by assessing most N pools and transformations in post-application observation periods of 14-19 days.We consistently recovered more N than applied,by an average of 126%.This was likely due to mineralization of endogenous organic-N,a reservoir that was not measured.Plant assimilation clearly represented the most important N sink for this fertilizer type,accounting for 25-117% of the applied N.Offsite loss to leaching and volatilization and onsite accumulation in the inorganic phase and in microbial biomass all assumed secondary and roughly equal importance;each term represented about 5-20% of the applied N.Denitri-fication was inconsequential in N loss from a mass standpoint,accounting for <2% of the effluent.The post-application fate of N in liquid swine waste did not differ fundamentally from other organic and inorganic fertilizers,as the relative importance of all loss and storage terms fell within the ranges of values given for other fertilizers.However,liquid swine waste did differ from other N fertilizers in the rate of processing.Transformations occurred rapidly due to the immediate post-application contact of liquid swine waste-N with plant roots and microbes in a form (NH4+-N) immediately available for use.
机译：在过去的15年中，在美国东南部，特别是在北卡罗来纳州，繁殖猪的密闭动物饲养业务（CAFO）激增了。这些设施中的废物收集在露天泻湖中，液相作为土地使用。许多研究都集中在含氮液体废物命运的各个方面，但没有一个尝试对施用后的转化和损失进行综合分析。在三种情况下，我们以典型的工业剂量试验性地施用了猪粪。在代表性的北卡罗莱纳州CAFO的主动喷雾场中仔细定义1.2和2.5 cm-ha（40-130 kg N ha-1）的地块，并通过评估后期氮肥的大部分氮库和转化来建立废物的氮质量平衡。应用观测期为14-19天。我们持续回收的氮比施用量多，平均为126％。这很可能是由于内源性有机矿化anic-N，一种未经测量的储藏库。植物同化作用显然是该肥料类型中最重要的氮库，占施氮量的25-117％。无机相中淋失和挥发的现场损失以及现场积累。在微生物生物量中，所有重要性均假定为次要的，并且具有大致相同的重要性;每个术语约占施用氮的5-20％。从质量的角度来看，脱氮对氮的损失不重要，占废水的<2％。液态猪粪中氮的命运与其他有机和无机肥料没有根本区别，因为所有损失和储存期的相对重要性都落在其他肥料给定值的范围内。由于液态猪粪N在施用后立即与植物根和微生物（NH4 + -N）接触，因此转化迅速发生。使用。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号