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Fluid Journal : Fluid Journal 1999-2001
Fall 1999 alone uptake was greater than when it interacted with row cleaners, where it had no effect. Procedure Soil. Experiments were conducted on a tile-drained Nicollet-Webster clay loam soil complex located at the Southern Experiment Station, Waseca, Minnesota. Plots. Tile lines were spaced 75 feet apart and all corn rows were perpendic- ular to the tile lines. Continuous corn plots were located on the same plots as in 1997, and stalks were not chopped. Corn also followed soybeans that had been no-till drilled in 1997. Each plot was 10 feet wide (4- to 30-inch rows) by 120 feet long. No plots were cultivated. Design. Experimental design was a 23 factorial with complete randomization within each of the four replicates. Planting. Pioneer 36F30 was planted on May 1 at a population of 33,000 seeds/A. Fluid 10-34-0 was applied with the seed at the rate of 10 gal/A on half of the plots. Additional P was not applied because soil tests taken in July of 1997 found Bray P1 was 22 and 26 ppm and exchangeable K was 166 and 167 ppm for the continuous corn and corn/soybean rotation sites, respectively. Pesticides. Corn rootworm was con- trolled in continuous corn with an appli- cation of the insecticide FORCE. Weeds were controlled with a preemergence application of HARNESS plus HORNET. Thinning. Plots were thinned to a uniform plant population of 31,400 plants/A after stand counts were taken on June 19. _________________________________ Dr. Randall is professor and Vetsch is assistant scientist at the Southern Experiment Station in Waseca, MN. ! "Starter fertilizer stimulated early plant growth and increased corn grain yields by 6 to 7 bu/A." Figure 3. Surface residue coverage as influenced by row cleaners and method of N application in corn-soybean rotation, Randall, et al., University of Minnesota, 1998. 60 55 50 45 40 35 30 UAN UAN UAN bdct + + RC RC 7/2 8/31 % Residue Figure 4. Emergence rate of corn following soybeans as influenced by row cleaners and starter fertilizer, Randall, et al., University of Minnesota, 1998. 10 11 12 13 14 15 16 17 18 Days After Planting 120 100 80 60 40 20 0 Percent Emerged None SF RC SF&RC
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