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Agricultural Practices Influence Dissolved Nutrients Leaching through Intact Soil Cores

Dep. of Natural Resource Sciences, Macdonald Campus of McGill University, Quebec, Canada H9X 3V9

View larger version (17K): [in a new window]   Fig. 1. Schematic diagram of leaching apparatus used in (a) the intact soil core study and (b) the disturbed small soil column study.

View larger version (21K): [in a new window]   Fig. 2. Dissolved N [NO3–N and dissolved organic N (DON)] concentrations in leachates from the treatment CT-CC-IF collected from (a) intact soil cores and (b) from disturbed small soil columns. The drinking water limit of 10 mg NO3–N L–1 is circled.

View larger version (21K): [in a new window]   Fig. 3. Relationship between dissolved organic C (DOC) and dissolved organic N (DON) loads in leachates from (a) the intact soil cores and (b) the disturbed small soil columns.

View larger version (24K): [in a new window]   Fig. 4. Dissolved P [dissolved reactive P (DRP) and dissolved organic P (DOP)] concentrations in leachates from the treatment conventional till (CT)–continuous corn (CC)–inorganic fertilizer (IF) collected from (a) intact soil cores and (b) disturbed small soil columns.

View larger version (19K): [in a new window]   Fig. 5. Relationship between dissolved organic P (DOP) and dissolved reactive P (DRP) loads in leachates from (a) the intact soil cores and (b) the disturbed small soil columns.

View larger version (19K): [in a new window]   Fig. 6. Relationships between soil NO3–N concentration and NO3–N load in leachates from (a) the intact soil cores and (b) the disturbed small soil columns.

View larger version (22K): [in a new window]   Fig. 7. Relationships between (a) the soil Mehlich-3 P concentration and dissolved reactive P (DRP) load in leachates, and (b) the soil Mehlich-3 P saturation ratio (M3-PSR) and dissolved reactive P (DRP) load in leachates. Leachates were collected from intact soil cores.

View larger version (20K): [in a new window]   Fig. 8. Relationships between (a) the soil Mehlich-3 P concentration and dissolved reactive P (DRP) load in leachates, and (b) the soil Mehlich-3 P saturation ratio (M3-PSR) and dissolved reactive P (DRP) load in leachates. Leachates were collected from disturbed small soil columns.

View larger version (29K): [in a new window]   Fig. 9. Relationships between (a) the soil Mehlich-3 P concentration and dissolved reactive P (DRP) concentration in leachates and (b) the soil Mehlich-3 P saturation ratio (M3-PSR) and dissolved reactive P (DRP) concentration in leachates. Data were from the intact soil core study (n = 20, two outliers were not included in the regression analysis).