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Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Transactions of the ASAE.  VOL. 43(6): 1589-1595 . (doi: 10.13031/2013.3059) @2000
Authors:   A. Bakhsh, R. S. Kanwar, D. L. Karlen, C. A. Cambardella, T. S. Colvin, T. B. Moorman, T. B. Bailey
Keywords:   Chisel plow, No-till, Preplant nitrogen, Corn, Soybean, Water quality

Tillage and N management can have great impact on crop yield and off-site transport of nitrate-nitrogen (NO 3 -N). This six-year field study on tile-drained Clyde-Kenyon-Floyd soils in northeast Iowa was conducted to quantify corn (Zea mays L.) and soybean (Glycine max (L.) Merr.) yield and residual soil NO 3 -N. Eight treatments (chisel plow vs no-tillage by preplant versus late-spring N-management for both corn and soybean phases of a rotation) were evaluated using a randomized complete block design. Preplant N was applied by injecting liquid urea-ammonium nitrate solution (UAN) at a rate of 110 kg N ha 1 . Late-spring soil-test based N-rates averaged 179 and 156 kg N ha 1 for no-till and chisel treatments, respectively. No additional N was applied to soybean. Average corn yield on chisel plots was significantly (P = 0.05) higher than with no-tillage for both preplant (7.9 vs 6.9 Mg ha 1 ) and late-spring (8.6 vs 8.1 Mg ha 1 ) N-management. Average soybean yield where corn had received preplant N (3.6 Mg ha 1 ) was significantly (P = 0.05) greater than where late-spring N-management (3.4 Mg ha 1 ) was used. Residual tillage effects did not significantly (P = 0.05) affect soybean yield. The average residual soil NO 3 -N to a depth of 1.2 m following corn was significantly (P = 0.05) lower for preplant (21 kg N ha 1 ) than late spring (29 kg N ha 1 ) N-management under no-till system, presumably reflecting differences in N application rates. Residual soil NO 3 -N following soybean was significantly (P = 0.05) lower in no-till (28 kg N ha 1 ) than chisel (37 kg N ha 1 ) plots. Average over-winter changes in residual soil NO 3 -N were greatest in corn plots previously fertilized with a single preplant application (+13 to 18 kg N ha 1 ) and most variable following soybean in plots where corn was fertilized based on late-spring nitrate test (LSNT) values (-8.5 to +6.3 kg N ha 1 ). Therefore development of efficient N-management strategies may require complete understanding of N-cycling processes taking place in the soil profile over winter months. The results of the study demonstrate that chisel plow increased corn yield with late-spring N-management and with preplant N when compared to no-till system.

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