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Dynamics of Potassium Leaching on a Hillslope Grassland Soil

^a National Institute for Agricultural Research (INIA), Remehue Research Station, Casilla 24-O, Osorno, Chile
^b The University of Reading, Department of Soil Science, Whiteknights, PO Box 233, Reading, Berks, RG6 6DW, UK
^c Institute of Grassland and Environmental Research (IGER), North Wyke Research Station, Okehampton, Devon, EX20 2SB, UK

View larger version (32K): [in a new window]   Fig. 1. (a) Rainfall (mm d–1), (b) flow (L s–1) in overland plus subsurface lateral flow (OSF) of undrained (D–) treatments, (c) flow (L s–1) in overland plus subsurface lateral flow (OSF) and mole plus tile flow (MTF) of drained (D+) treatments and K concentration in the leachates (mg L–1) with and without nitrogen + farmyard manure (FM) fertilizer application for 2000–2001 in (d) undrained (D–) and (e) drained (D+) treatments. Arrows indicate the date of FM application.

View larger version (33K): [in a new window]   Fig. 2. Typical hydrographs during the declining phase in drainage from (a) undrained and (b) drained treatments with and without nitrogen application. Results are for a storm event during September 1999 (top) and February 2000 (bottom). The inserts show the corresponding linear regression for the logarithmically transformed flow data.

View larger version (18K): [in a new window]   Fig. 3. An example of a fitted double exponential curve to describe the trend of changes in K concentration (mg L–1) in drainage over time (accumulated number of days with drainage) from the N+, D– treatment during 1999–2000. Day 0 represents the concentration in the background flow at the time when the drainage started.

View larger version (18K): [in a new window]   Fig. 4. Idealized hydrographs showing (a) overland plus subsurface lateral flow (OSF) and mole plus tile flow (MTF) and (b) simplified diagram of the trend in K concentration in drainage water with and without N + farmyard manure (FM) application. The Phase A and B sections indicate fast and slow phases of the pattern of K losses by leaching.