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Corn Root Effects on the Nitrogen-Supplying Capacity of a Conditioned Soil

Jose E. Sanchez*,a, Eldor A. Paulb, Thomas C. Willsonc, Jeffrey Smeenka and Richard R. Harwooda

a Dep. of Crop and Soil Sci., Michigan State Univ., East Lansing, MI 48824
b Nat. Resour. Ecol. Lab., Colorado State Univ., Fort Collins, CO 80523
c Southwest Kansas Res. and Ext. Cent., Kansas State Univ., Garden City, KS 67846



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  		Fig. 1. Net mineralized N at 70 d of laboratory incubations for soils from a corn–corn–soybean–wheat rotation and continuous corn at the Living Field Laboratory. Sampling was done in May 1999. Units are based on a 10-cm sample depth. Letters indicate significant differences (P < 0.05) in mineralized N after 70 d of incubation.

 


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  		Fig. 2. Net mineralized N at 70 d of laboratory incubation for at-planting soils and 70-d-after-planting soils in 1999. Units are based on a 10-cm sample depth. Letters indicate significant differences (P < 0.05) in mineralized N after 70 d of incubation.

 


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  		Fig. 3. Net mineralized C based on CO2–C released during laboratory incubations for at-planting and 70-d-after-planting (70 DAP) soils in 1999. Units are based on a 10-cm sample depth. Error bars represent the standard errors of the least square means.

 




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