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Integrating Soil and Weather Data to Describe Variability in Plant Available Nitrogen

^a Dep. of Land Resource Science, Univ. of Guelph, Guelph, ON, N1G 2W1 Canada
^b Dep. of Soil Science, Univ. of Bu–Ali Sina, Hamadan, Iran
^c Dep. of Soils and Plant Nutrition, Rubber Research Institute of Sri Lanka, Dartonfield, Agalawatta, Sri Lanka

View larger version (14K): [in a new window]   Fig. 1. Seasonal variation in the accumulation of degree days.

View larger version (14K): [in a new window]   Fig. 2. Seasonal variation in the accumulation of rainfall.

View larger version (17K): [in a new window]   Fig. 3. Accumulation of soil mineral N (SMN), total shoot N (PN), and plant available N (PAN) in the 0N plots over the growing season (average across reps, management treatments, landscape positions and all years except 2000). Bars describe standard deviation among years of average across reps, management treatments and landscape positions.

View larger version (24K): [in a new window]   Fig. 4. Variation between years in the relation between Plant Available N (kg ha–1) and Cumulative Degree Days (CDD) illustrated for the backslope and footslope positions in 1999 (Fig. 4a) and 2001 (Fig. 4b) for the barley-NT treatment.

View larger version (12K): [in a new window]   Fig. 5. Variation in net mineralization of N with soil water content (expressed as water-filled pore space) of soil from the toeslope position (adapted from Drury et al., 2003).

View larger version (65K): [in a new window]   Fig. 6. Illustration of the variation in Plant Available N at 2000 CDD with organic carbon content and cumulative rainfall in the period 200 to 700 CDD described by the regression equation in Table 4 for the barley-NT treatment.

View larger version (13K): [in a new window]   Fig. 7. Comparison of Plant Available N at 2000 cumulative degree days observed on two research sites in 1998 at the Elora Research Station with that predicted from the regression equations in Table 4.

View larger version (25K): [in a new window]   Fig. 8. Frequency distribution of Plant Available N at 2000 cumulative degree days predicted for each year through the period 1985–2000 for organic C contents of 10, 20, and 30 g kg–1 using the model for the barley-NT treatment (Table 4) and cumulative precipitation from 200–700 CDD.