• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Annual International Meeting of the American Society of Agricultural and Biological Engineers >Nutrient Concentrations of Runoff as Affected by the Diameter of Unconsolidated Materials from FeedlotSurfaces
【24h】

Nutrient Concentrations of Runoff as Affected by the Diameter of Unconsolidated Materials from FeedlotSurfaces

机译：受饲料urfaces的未溶解材料直径影响的径流营养浓度

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

摘要

Beef cattle feedlots contain unconsolidated material that accumulate on the feedlot surface during a feeding cycle. This study was conducted to: (1) determine the effects of varying diameter of unconsolidated surface material on nutrient concentrations of runoff and (2) identify the effects of selected runoff rates on nutrient concentrations of runoff from unconsolidated surface material containing variable particle diameters. Unconsolidated surface material with a mean diameter of 4.76, 9.53, 19.1 or 47.5 mm and a composite sample with a 10.8 mm mean diameter were placed within a 0.75 m wide by 4.0 m long plot area. Flow was then introduced at the top of the plots in successive increments and runoff samples for water quality analyses were obtained.Particle diameter significantly influenced runoff concentrations of dissolved phosphorus (DP), particulate phosphorus (PP), total phosphorus (TP), and NH_4-N. Concentrations of DP, PP, TP and NH_4-N for the composite material were 1.90, 1.28, 3.18, and3.81 mg L~(-1) respectively. Runoff rate also significantly affected concentrations of DP, PP, TP, and NH_4-N for each of the particle size classes except the 4.76 mm diameter material. For the composite material, concentrations of DP, PP, TP, and NH_4-Ndecreased from 4.30 to 0.34 mg L~(-1), 5.52 to 0.41 mg L~(-1), 9.82 to 0.75 mg L~(-1), and25.8 to 0.49 mg L~(-1), respectively, as runoff rate increased from 0.02 to 1.10 L sec~(-1). Thus, both the diameter of unconsolidated material from feedlot surfaces and runoff rate may significantly influence nutrient concentrations of runoff.
机译：肉牛饲料含有未溶解的材料，在进料循环期间含有在饲养表面上积聚。本研究进行了：（1）确定未核化表面材料对径流营养浓度的不同直径的影响，（2）鉴定所选径流率对含有可变粒径的未溶解表面材料的径向营养浓度的影响。平均直径为4.76,9.53,19.1或47.5mm和具有10.8mm平均直径的复合样品的未核化表面材料置于0.75米宽的4.0μm长绘制区域。然后以连续的增量在图的顶部引入流动，并获得用于水质分析的径流样品。Particle直径显着影响溶解磷（DP），颗粒磷（PP），总磷（TP）和NH_4的径流浓度-N。用于复合材料的DP，PP，TP和NH_4-N的浓度分别为1.90,1.28,3.18，和3.81mg L〜（-1）。除了4.76mm直径材料外，径流率也显着影响每个粒度等级的DP，PP，TP和NH_4-N的浓度。对于复合材料，DP，PP，TP的浓度为4.30至0.34mg L〜（-1），5.52至0.41mg L〜（-1），9.82至0.75mg L〜（-1）分别为25.8至0.49 mg L〜（-1），因为径流率从0.02增加到1.10秒〜（-1）。因此，来自饲料表面和径流率的未核化材料的直径可以显着影响径流的营养浓度。

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