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Bioremediation of Residual Fertilizer Nitrate

I. Laboratory Demonstration of an On-Farm In Situ Pollution Control System

Benjamin U. Ugwuegbu, Shiv O. Prasher and Darakhshan Ahmad

INRS-Santé, Université du Québec, 245 Boulevard Hymus, QC, Canada H9R 1G6



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  		Fig. 1. Schematic of a packed soil column for nitrate treatment

 


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  		Fig. 2. Changes in nitrate N concentration with high level of glucose C (970 mg L-1) in the subirrigation water at the (a) 40-cm, (b) 60-cm, and (c) 85-cm depths (Experiment I, Stage 1). The error bars in the figure and all other subsequent graphs show the standard deviation (SD), showing that 68% of the data obtained (assuming a normal distribution) lie within ±1 SD from the mean (Zolman, 1993; SAS Institute, 1989)

 


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  		Fig. 3. Changes in nitrate N concentration with a low level of glucose C (120 mg L-1) in the subirrigation water at the (a) 40-cm, (b) 60-cm, and (c) 85-cm depths (Experiment I, Stage 2). Error bars show SD

 


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  		Fig. 4. Changes in nitrate N concentration of subirrigation with glucose C levels at (a) 0, (b) 20, (c) 70, (d) 150, and (e) 300 mg L-1 at the 40-cm depths after 96 d of subirrigation (Experiment II, Stage 2). Error bars show SD

 


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  		Fig. 5. Loss of nitrate N at the 40-cm depth between Days 18 and 29 during treatment with different concentrations of glucose C, after 96 d of subirrigation (Experiment II, Stage 2). Error bars show SD

 




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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
and Life Sciences Education		 Vadose Zone Journal
Soil Science Society of America Journal Journal of Plant Registrations The Plant Genome
Copyright © 2001 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.