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Fluid Journal : Fluid Journal 1996-1998
1 Fluid Journal Summer 1998 Summary: Surface banding in reduced- till has shown up to 21 bu/A increases in corn yields over broadcasting in University of Maryland trials, 5 bu/A increases in wheat yields, and as high as 1,100 lbs/A increases in bromegrass in Kansas comparisons. Corn is drier when harvested, nutrient uptake is greater P/K fixation is reduced, and wind drift is less. Growers who band are finding that crop yields improve significantly compared to broadcasting, where nutrients may be lost due to residue tie- up and volatilization. Surface banding, sometimes called "dribbling" or "stripping," allows for the speed and convenience of custom application, yet offers the agronomic benefits of banded fertilizer. It is environmentally preferred. Surface banding involves application of liquid fertilizer in bands or strips of varying widths on the soil's surface or on the surface of crop residues. Zones of high nutrient concentration are produced, which improve nutrient-use efficiency. Relative to concentration of nutrients in the soil, this technique is intermediate between broadcast and subsurface banding (Figure 1). Hundreds of university and private trials also have shown greater yield potential in reduced-till with surface banding when compared to broadcasting. These tests have been systematically conducted on corn, wheat, and pasture, some of which we will review in this discussion. Conversion is required to switch to a reduced-till banding program. Spray by Dr. Raun Lohry Surface Banding Superior To Broadcasting on Reduced-Till Field studies demonstrate yield benefits in corn, wheat and bromegrass. booms on applicators must be modified to apply fertilizer in streams rather than in a spray pattern. On corn ground, strips are spaced 30 inches apart. On pasture and wheat strips, spacing is set at 18 inches. Figure 1. Soil nutrient concentrations comparing broadcasting, surface banding, and subsurface banding. Broadcast & Disked Surface Banding Root Zone Banding Application Rate: 100 N, 40 P O lb per Acre 25 6,200 ppm N 1,200 ppm P 750 ppm N 128 ppm P 11ppmN 19ppmP ! ! ! ! ! ! ! ! !! ! ! ! ! ! ! ! ! ! ! ! ! !! ! ! ! ! ! ! ! ! ! ! ! !! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! Figure 2. Corn yield response to surface banding NPK versus broad- casting in reduced-till, Purdue Uiversity. Figure 3. Corn yield response to surface banding N versus broadcasting in reduced-till, University of Maryland. broadcast 115 120 125 130 135 140 Yield - bu/A Band broadcast 95 100 105 110 115 120 Yield - bu/A Band
Fluid Journal 1993-1995
Fluid Journal 1999-2001