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Predicting Nitrate Leaching under Potato Crops Using Transfer Functions

Département des sols et de génie agroalimentaire, FSAA, Université Laval, Québec, QC, Canada G1K 7P4

View larger version (31K): [in a new window]   Fig. 1. Evolution of normalized ammonium masses in soil during cropping season and fitted lognormal probability density function (pdf) of time-distributed nitrogen inputs [Nf(t)]. Planting date (P) and fertilizer sidedressing date (S) are indicated with arrows.

View larger version (31K): [in a new window]   Fig. 2. Cumulative N mineralization patterns of four sandy soils sampled in spring following previous sod and potato crops, and incubated at three constant temperatures (4, 14, and 24°C).

View larger version (31K): [in a new window]   Fig. 3. Evolution of cumulative plant N uptake during cropping season and fitted lognormal probability density function (pdf) of cumulative plant nitrogen uptake [Np(t)]. Final plant N uptake corresponds to tuber N uptake. Arrows indicate planting date (P), fertilizer sidedressing date (S), and harvest date (H).

View larger version (30K): [in a new window]   Fig. 4. Measured and predicted nitrate flux concentrations in drainable lysimeters at a 1-m soil depth.

View larger version (23K): [in a new window]   Fig. 5. Relative bias error on predicted nitrate flux concentrations evolving at a 1-m soil depth under four potato fields (1, 2, 3, and 4) and one barley field (5) in 1996.

View larger version (21K): [in a new window]   Fig. 6. Measured and predicted cumulative NO3–N leaching mass flux at a 1-m soil depth under four potato fields (1, 2, 3, and 4) and one barley field (5) in 1996.

View larger version (26K): [in a new window]   Fig. 7. Simulated N mass fluxes under average conditions for potato production in 1996.