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Environmental and Agronomic Implications of Water Table and Nitrogen Fertilization Management

Abdirashid A. Elmia, Chandra Madramootoob, Mohamud Egehb, Aiguo Liua and Chantal Hamel*,a

a Dep. of Natural Resource Science, Macdonald Campus of McGill University, 21 111 Lakeshore Rd. Ste-Anne-de-Bellevue, QC, Canada H9X 3V9
b Dep. of Agric. Biosyst. Engineering, Macdonald Campus of McGill University, 21 111 Lakeshore Rd. Ste-Anne-de-Bellevue, QC, Canada H9X 3V9



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Fig. 1. Schematic representation of the experimental layout and treatment arrangements.

 


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Fig. 2. Nitrate nitrogen concentrations in the soil profile under free drainage (FD) and subirrigation (SI) practices in (a) spring 1997, (b) fall 1997, (c) spring 1998, and (d) fall 1998. Vertical bars represent standard error of the mean (n = 9).

 


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Fig. 3. Soil surface (0–0.2 m) NO-3–N concentration under free drainage (FD) and subirrigation (SI) practices in (a) 1996, (b) 1997, and (c) 1998. Vertical bars represent standard error of the mean (n = 3).

 


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Fig. 4. Nitrate nitrogen concentrations in the soil profile under 120 kg N ha-1 (N120) and 200 kg N ha-1 (N200) (a) spring 1997, (b) fall 1997, (c) spring 1998, and (d) fall 1998. Vertical bars represent standard error of the mean (n = 9).

 


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Fig. 5. Soil surface (0–0.2 m) NO-3–N concentrations under 120 kg N ha-1 (N120) and 200 kg N ha-1 (N200) rates in (a) 1996, (b) 1997, and (c) 1998 growing seasons. Vertical bars represent standard error of the mean (n = 3).

 


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Fig. 6. Water-filled pore space (WFPS) as influenced by water table management treatments in (a) 1996, (b) 1997, and (c) 1998. Vertical bars represent standard error of the mean (n = 3).

 





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