Two computer simulation models were used to determine the effects of different nitrogen (N) management practices and crop production systems on the loss of nitrate-nitrogen (NO3N) with drainage waters from agricultural watersheds. The results of this simulation study show that larger applications of N fertilizer resulted in larger NO3N losses through subsurface drainage. When the N application rate was increased from 75 to 225 kg/ha (a 200% increase), NO3N loss with drainage water increased by an average of about 300%. Multiple applications of N fertilizer could reduce NO3N leaching losses from 10 to 35% in comparison with single N applications. Also, NO3N leaching losses were considerably less under a corn-soybean rotation than under a continuous corn production. © 1988.
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