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The Non-Limiting and Least Limiting Water Ranges for Soil Nitrogen Mineralization

^a Greenhouse & Processing Crops Research Centre, Agriculture & Agri-Food Canada, Harrow, ON Canada N0R 1G0
^b Dep. of Land Resource Science, Univ. of Guelph, Guelph, ON Canada N1G 2W1

View larger version (29K): [in a new window]   Fig. 1. Soil mineral N in the Brady sandy loam, Fox loamy sand, Conestogo loam, Perth silt loam, and Brookston clay loam after the 1-mo incubation as affected by water-filled pore space, relative compaction, and legume treatments. The dashed line represents the initial mineral N levels in the soil.

View larger version (31K): [in a new window]   Fig. 2. Soil mineral N in the Brady sandy loam, Fox loamy sand, Conestogo loam, Perth silt loam, and Brookston clay loam after the 3-mo incubation as affected by water-filled pore space, relative compaction, and legume treatments. The dashed line represents the initial mineral N levels in the soil.

View larger version (23K): [in a new window]   Fig. 3. Illustration of variation in shape of curve relating net N mineralization to WFPS (a) Fox, relative compaction 0.83, 3-mo incubation, no red clover added; (b) Brady, relative compaction 0.91, 3-mo incubation, red clover added; (c) Brookston, relative compaction 0.91, 3-mo incubation, red clover added.

View larger version (19K): [in a new window]   Fig. 4. Values of the upper limits of the NLWR and the LLWR relative to the water content at field capacity (-0.01 MPa).

View larger version (20K): [in a new window]   Fig. 5. Values of the lower limits of the NLWR and the LLWR relative to the water content at permanent wilting point (-1.5 MPa).

View larger version (27K): [in a new window]   Fig. 6. Nitrous oxide emissions during the 12-wk incubation for Brady sandy loam, the Perth silt loam, and the Brookston clay loam soils at 20, 50, 65, 85, and 95% water-filled pore space (WFPS).

View larger version (17K): [in a new window]   Fig. 7. Cumulative N2O emissions at 20, 50, 65, 85, and 95% for the Brady sandy loam, Perth silt loam and Brookston clay loam soils with and without red clover after a 12-wk incubation.