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a Natural Resource Sciences Dep., Macdonald Campus of McGill Univ., 21 111 Lakeshore Rd., Ste. Anne de Bellevue, QC, H9X 3V9 Canada
cam{at}agreng.lan.mcgill.ca
Received for publication July 6, 1998. The objective of the study was to determine whether tillage and residue practices have a significant effect on the yield and N content of corn (Zea mays L.) under nonlimiting soil N conditions. Nitrate leaching has been identified as a source of non-point-source pollution. By identifying tillage practices which maximize corn N uptake, recommendations can be based on how to minimize N loss. A 2-year field study was conducted in southwestern Quebec on a 2.4-ha site of a Typic Endoaquent (Humic Gleysol) cropped to corn. Three types of tillage practice (conventional tillage, reduced tillage, and no-till) were combined with two residue levels (with and without) in a randomized complete block design. The effect of these practices on corn yield and corn N were studied. Seedling emergence rates in spring, and corn moisture content at harvest, were also monitored. Residues hindered initial plant emergence in the no-till plots. Corn N and moisture contents in 1996 and 1997 indicated that no-till with residue had a delayed maturity relative to the other treatments. However, total corn biomass and grain yields were not affected by tillage or residue treatments. No correlation between corn yield and corn N content was found.
Abbreviations: CT, conventional tillage • NT, no-till • RT, reduced tillage • +R, with residue • -R, no residue
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