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Fluid Journal : Fluid Journal 2002-2004
4 Fluid Journal Fall 2002 the control plots for each tillage system. Soil test P levels in some of these plots are declining to the point where yields are becoming limited while in other plots within the same treatments yields are not being limited by P. When averaged across similar P management strategies, yields among the four tillage systems were not statistically significant. Soybeans did not respond to the residual effect of the starter when averaged across tillage systems. A tillage-by-starter interaction was not found. A statistically significant yield difference was not found between the 80-lb/A broadcast rate of P2O5 and the 40-lb/A rate that was applied either as a starter or as deep band below the corn row, but yields were consistently 3 to 5 bu/A higher with the broadcast treatment. Averaged across four years (1998 to 2001), soybean yield was affected significantly when tillage systems were compared across similar P management strategies (Table 4). Highest yields were obtained with one-pass and chisel systems, with somewhat lower yields for strip-till and no-till. Soybean yield did not respond to the residual effect of starter when averaged across tillage systems, and a tillage-by-starter interaction did not occur. A yield difference was not found between the 80-lb/A broadcast rate of P2O5 and the 40-lb/A rate, applied either as a starter or as a deep band below the corn row. Dr. Randall is professor and soil scientist and Vetsch is assistant scientist at the Southern Research and Outreach Center at the University of Minnesota.
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