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Nitrogen and Carbon Leaching in Agroecosystems and Their Role in Denitrification Potential

Dep. of Forest Ecology and Management, Univ. of Wisconsin-Madison, 1630 Linden Dr., Madison, WI 53706-1598

View larger version (28K): [in a new window]   Fig. 1. Cumulative drainage from replicate equilibrium-tension lysimeters for the prairie, no-tillage, and chisel-plowed maize ecosystems between June 1995 and April 1999

View larger version (23K): [in a new window]   Fig. 2. Nitrate N concentrations from replicate equilibrium-tension lysimeters for the prairie, no-tillage, and chisel-plowed maize ecosystems between June 1995 and April 1999. Standard error bars are provided where the mean of replicate samples is plotted

View larger version (26K): [in a new window]   Fig. 3. Nitrate N concentrations from porous cup samplers at 1.2 m in the prairie, no-tillage, and chisel-plowed maize ecosystems between April and September 1995, 1996, and 1997. Standard error bars are provided where the mean of replicate samples is plotted

View larger version (47K): [in a new window]   Fig. 4. Dissolved organic C and inorganic C concentrations from replicate equilibrium-tension lysimeters for the prairie, no-tillage, and chisel-plowed maize ecosystems between June 1995 and April 1999. Standard error bars are provided where the mean of replicate samples is plotted

View larger version (28K): [in a new window]   Fig. 5. Cumulative total N and nitrate N leaching losses from the prairie, no-tillage, and chisel-plowed maize ecosystems between June 1995 and April 1999

View larger version (26K): [in a new window]   Fig. 6. Nitrogen leaching losses from replicate equilibrium-tension lysimeters for the prairie, no-tillage, and chisel-plowed maize ecosystems between June 1995 and April 1999. Standard error bars are provided where the mean of replicate samples is plotted

View larger version (30K): [in a new window]   Fig. 7. Cumulative dissolved C leaching losses from the prairie, no-tillage, and chisel-plowed maize ecosystems between June 1995 and April 1999

View larger version (45K): [in a new window]   Fig. 8. Dissolved organic C and inorganic C leaching losses from replicate equilibrium-tension lysimeters for the prairie, no-tillage, and chisel-plowed maize ecosystems between June 1995 and April 1999. Standard error bars are provided where the mean of replicate samples is plotted