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Tillage and Manure Application Effects on Mineral Nitrogen Leaching from Seasonally Frozen Soils

Satish Guptaa,*, Emmanuel Munyankusib, John Moncriefa, Francis Zvomuyaa and Matt Hanewallc

a Department of Soil, Water, and Climate, University of Minnesota, St. Paul, MN 55108
b Previously with the Department of Soil, Water, and Climate, University of Minnesota, St. Paul, MN 55108
c Previously with the Department of Soil Science, University of Wisconsin, Madison, WI 53706



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  		Fig. 1. Line diagram of a sampler setup.

 


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  		Fig. 2. Pictures of (a) wick and pan samplers and (b) an installed sampler with a collection vessel.

 


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  		Fig. 3. Effect of season and sampler type on (a) percolation and (b) mineral N concentration at a 60-cm depth. Bars with the same letter represent means that are not significantly different at the 10% probability level according to the lsmeans procedure of SAS (SAS Institute, 1999). NGS, nongrowing season, GS, growing season.

 


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  		Fig. 4. Effect of tillage and manure on mineral N concentration of the percolating water at a 60-cm depth. Bars with the same letter represent means that are not significantly different at the 10% probability level according to the lsmeans procedure of SAS (SAS Institute, 1999).

 


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  		Fig. 5. Effect of tillage and sampler type on mineral N concentration of the percolating water at a 60-cm depth. Bars with the same letter represent means that are not significantly different at the 10% probability level according to the lsmeans procedure of SAS (SAS Institute, 1999).

 


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  		Fig. 6. Effect of season, manure, and sampler type on mineral N leaching losses at a 60-cm depth. Bars with the same letter represent means that are not significantly different at the 10% probability level according to the lsmeans procedure of SAS (SAS Institute, 1999).

 




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Vadose Zone Journal Journal of Plant Registrations
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