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首页> 外文会议>International Drainage Symposium >Effects of Drain Depth on Nitrate-N and Phosphorus Losses from Drained Agricultural Lands Receiving Nitrogen and Phosphorus from Organic Sources
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Effects of Drain Depth on Nitrate-N and Phosphorus Losses from Drained Agricultural Lands Receiving Nitrogen and Phosphorus from Organic Sources

机译：排水深度对来自有机源氮和磷的排水农业土地的硝酸盐 - 氮和磷损失的影响

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Nitrate and phosphorus losses from drained agricultural lands are an important environmental concern. Installation of subsurface drainage systems at depths more shallow than typical depths has been proposed as a method for reducing nitrate nitrogen (N03--N) losses in a manner similar to that of controlled drainage. Data were collected from two drainage systems near Plymouth, NC to determine the effect of drain depth on losses ofN03-N and orthophosphate (OP) Drains in the deep system were 1.5 m deep and 25 m apart while drains in the shallow system were 0.75 m deep and 12.5 m apart. Both plots received swine wastewater applications during the first 31 months of the study (October 2002 to April 2005). Overall, the shallow drain system reduced outflowsby 17.1% for this period. No significant differences were observed in the N03--N concentration of the drainage water between the plots; however, the OP concentration in the drainage water of the shallow plot was significantly higher. N03--N export was reduced by 9.8% at the shallow drain plot during the course of the study. Results of this study were complicated by the application ofN and P as swine wastewater which apparently resulted in preferential flow immediately after applications causing relatively high loads ofN and P directly to the shallow drains. This phenomenon would not likely occur in cropland where N and P are applied as inorganic fertilizer. This study was continued on the same site for 36 more months (July 2005 through June 2008) using inorganic N and P as fertilizer. This paper reports the effects of drain depth on N03- -N and OP losses from the study site when organic N and P fertilizer was used.
机译：排水农业土地的硝酸盐和磷损失是一个重要的环境问题。已经提出了在深度浅的深度浅的地下排水系统，以便以与受控引流的方式减少硝酸氮（N03 - N）损耗的方法。从普利茅斯附近的两个排水系统中收集数据，NC为漏极深度对NN03-N和正磷酸盐（OP）的损失的影响，深层系统中的漏极为1.5米，除浅系统中的排水中分开25米，为0.75米深入12.5米。这两个地块在研究的前31个月（2002年10月至2005年4月）中获得了猪废水应用。总的来说，浅排水系统在此期间减少了17.1％。在图之间的排水水的N03 - N浓度中没有观察到显着差异;然而，浅图的排水水中的OP浓度显着高。在研究过程中，N03 - N导出减少了9.8％的浅漏区块。该研究的结果是通过NN和P的应用复杂，作为猪废水，显然在应用后显然导致的优先流动，其在施加相对较高的OFN和P直接到浅水中。这种现象不太可能发生在N和P作为无机肥料施用的农作物中发生。使用无机N和P作为肥料，该研究在同一部位（2005年7月至2008年6月）继续进行了36个月。本文在使用有机N和P肥料时，报道了排水深度对研究部位的N03--N和OP损失的影响。

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