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外文期刊>Canadian water resources journal
>Subsurface Nitrate#x2013;N Leaching Loss as Affected by Drainage Size and Depth in a Shallow Slowly#x2013;Permeable Soil
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Subsurface Nitrate#x2013;N Leaching Loss as Affected by Drainage Size and Depth in a Shallow Slowly#x2013;Permeable Soil
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机译：Subsurface Nitrate#x2013;N Leaching Loss as Affected by Drainage Size and Depth in a Shallow Slowly#x2013;Permeable Soil
Subsurface drainage discharge nitrate#x2013;N (NO3#x2013;N) losses were evaluated under corn during a three year period under three replicated drainage systems: i) 100#x2002;mm diameter drainage tile at 80#x2002;cm depth; ii) 50#x2002;mm diameter drainage tile at 80#x2002;cm depth and iii) 50#x2002;mm diameter drainage tile at 50#x2002;cm depth. Each drainage system had 12#x2002;m spacings between laterals. The field under investigation possessed shallow, imperfectly#x2013;to#x2013;poorly drained soils. Throughout the investigation average NO3#x2013;N concentrations in the drainage outflow were similar for all three systems ranging from 9.6#x2013;11.4#x2002;mg L#x2212;1. Total drainage discharge was significantly lower for the shallow (50#x2002;cm) system compared to the two deeper (80#x2002;cm) systems. Therefore, significant differences in total NO3#x2013;N loss between the shallow (50#x2002;cm) and deep (80#x2002;cm) systems were observed with shallow systems providing reduced NO3#x2013;N losses. Corn yields were significantly lower in the shallow (50#x2002;cm) drainage treatment in only one year. Shallow drainage may have many economical and environmental benefits and require further research to evaluate its potential under various soil types.
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