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Measured Effect of Agricultural Drainage Water Management on Hydrology, Water Quality, and CropYield

机译：农业排水水管理对水文，水质和农作物的影响

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A field scale experiment has been initiated in 2006 to study the effects of controlled drainage on drain flow, nutrient export, and crop yield for a subsurface drained site in eastern Ontario, Canada. Eight paired fields of comparable size (2 to 7 ha), soil (Bainsville silt loam), crop rotation (corn-soybean), and drainage system (subsurface drains 100 cm deep and spaced 15 m apart) were evaluate in the study. For each field pair, controlled drainage (CD) is implemented on one field and conventional(uncontrolled) drainage (UCD) is implemented on the other field. The results of the study showed that controlled drainage substantially reduced subsurface drainage and nutrient (nitrogen and phosphorus) export with drain flow, compared with conventionaldrainage. On average over the four field pairs and the three-year period, controlled drainage reduced the May-to-November drain flow by 50%, nitrate-nitrogen export by 47% and total phosphorus export by 55%. These results support the contention that nutrient reductions are controlled primarily by reduced drain flow. The results suggest the May-to-November nutrient mass losses were, overall, modest. A very modest increase in crop yield was observed with implementing drainage water management, although results were not statistically significant. Nevertheless, the results do show that controlled drainage does not have an adverse effect on crop yield.
机译：在2006年开始了一个现场规模实验，研究了控制排水对油急流，加拿大东部地区排水场地的排水，营养输出和作物产量的影响。八个可比尺寸的配对领域（2至7公顷），土壤（Bainsville淤泥壤土），作物旋转（玉米大豆）和排水系统（地下耗尽100厘米深且间隔15米分开）进行了评估。对于每个场对，控制排水（CD）在一个字段上实现，并且传统的（不受控制的）排水（UCD）在另一个场上实现。该研究结果表明，与常规德拉塞相比，控制排水基本上降低的地下排水和营养素（氮气和磷）出口，与排水流。平均在四个田间对和三年期间，受控排水将50％降低50％，硝酸盐 - 氮素出口量47％，总磷出口量为55％。这些结果支持营养减少主要通过减少排水流量控制的争夺。结果表明，11月至11月营养质量损失，总体而言，适度。观察到在实施排水水管理中观察到作物产量的非常适度的增加，尽管结果没有统计学意义。然而，结果表明，控制引流对作物产量没有不利影响。

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