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Fluid Journal : Fluid Journal 1996-1998
2 Fluid Journal Winter 1998 conditions resulted in below normal yields in 1993. This is accounted for in our three-year average. Row width. Averaged over three years, corn planted at Lamberton and Waseca in 10- and 20-inch row widths yielded 7.2 percent more than 30-inch row widths (Figure 1). Note there was no significant difference in grain yield between 10- and 20-inch row widths. At Morris, average yield increase for 10- and 20-inch row width, compared with 30-inch, was 8.5 percent (Figure 2). Plant population. At Lamberton and Waseca, average yield increase was highest with densest population (40,000 plants/A) as seen in Figure 3. Regression analysis of yield versus harvest plant population was significant in 1992 and 1994 at Lamberton, and in 1994 at Waseca, with maximum yields obtained at populations of approximately 41,000, 35,000, and 41,000 plants/A, respectively. At Morris, effect of plant population on yield was not consistent across row widths. Yields at 10- and 20- inch row widths were essentially the same across the three plant populations, whereas yields on 30-inch rows were lower at 27,000 plants/A compared to yields of 10- and 20-inch rows. Regression analysis of yield versus harvest plant population was significant in 1993 and 1994, the only years harvest plant populations were recorded. In averaging both years a harvest population of 32,000 plants/A, the highest population tested, resulted in the highest yield (Figure 4). Hybrid influenced grain yield at all three locations. Hybrid effect on yield was consistent regardless of row width and plant population. At Lamberton and Waseca, DK512 had the highest average yield, followed by P3563 then G4372 (Figure 5). However, these results were not consistent across locations and years. In 1993, the year with the lowest yields, G4372 yielded less than the other two hybrids at Lamberton, but more than the two other hybrids at Waseca. At Morris, P3751 yielded more than either N3624 or DK421 when averaged over the three years (Figure 6). Procedure Locations. Field research was conducted in Minnesota from 1992 through 1994 at the West Central, Southwest, and Southern Experiment Stations at Morris, Lamberton, and Waseca, respectively. Soil type at Lamberton and Waseca is a fine, loamy, mixed, mesic Typic Haplaquell. At Morris it is a fine, loamy, mixed noncalcareous Typic Haplaquell. Plots. At Lamberton and Waseca, factorial experiments were established in a randomized complete block design with a split plot layout where three row widths were randomly assigned to main plots in each of four replicates. All combinations of four plant populations and three corn hybrids were randomly assigned to subplots. At Morris, experimental design was a 3 x 3 x 3 factorial with four replicates in a randomized complete block design. Size of each subplot was 10 by 30 feet Figure 3. Effect of plant population on corn yield, Lamberton and Waseca, Porter et al., University of Minnesota, 1992-94. Figure 2. Effect of row width on corn yield, Morris, Porter et al., University of Minnesota, 1992-94. 10 106 108 110 112 114 116 Yield - bu/A 20 30 Row Width - Inches 40,000 35,000 30,000 25,000 140 141 142 143 144 145 Yield - bu/A Plants Per Acre Figure 4. Effect of plant population on average corn yield, Morris, Porter et al., University of Minnesota, 1992-94. 32,000 27,000 22,000 108 110 112 114 116 118 Yield - bu/A Plants Per Acre
Fluid Journal 1993-1995
Fluid Journal 1999-2001