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Fluid Journal : Fluid Journal 1996-1998
2 Fluid Journal Summer 1998 Among the benefits growers can expect by surface banding in reduced-till instead of broadcasting are: • greater nutrient uptake • reduced fixation of phosphorus and potash • less wind drift. Better penetration of the soil's surface may also result. High concentrations of N in the band will tend to overwhelm immobilization mechanisms of crop residue. The results are higher yields and greater efficiency. 5- to 21-bushel bump Purdue. Five-year trials on corn at Purdue University during the '80s first brought attention to the benefits of surface banding versus broadcasting. An NPK program was banded on the surface and plowed under. After five years, surface banding produced 132 Figure 4. Corn yield response to surface banding NPK versus broadcast- ing in reduced-till, Iowa. Figure 5. Wheat yield response to surface banding versus broadcasting in reduced-till, Iowa broadcast Check 20 25 30 35 40 Yield - bu/A Band 60 N-lbs/A 120 Check 1,000 2,000 3,000 4,000 5,000 6,000 Yield - bu/A Broadcast Banded Figure 6. Bromegrass yield response to surface banding N versus broadcasting in reduced-till, Kansas. bu/A compared to 121 bu/A by broadcasting, or a gain of 11 bu/A (Figure 2). Maryland. At the University of Maryland, 125 pounds of nitrogen was surface banded on no-till corn and produced 120 bu/A compared to 99 bu/ A by broadcasting, or a net gain of 21 bu/A (Figure 3)! Iowa. In Iowa, the results of five band-applied NPK (plus sulfur and zinc) trials in the Fall resulted in yield increases over broadcasting as high as 15 bu/A (Figure 4). The average of the five applications was an improvement of 10 bu/A. Just as significant was a one percent decrease in moisture at harvest time. Drier corn and associated reduced drying costs in the Fall suggest surface banding has better fertilizer efficiency. Surface banding compared favorably in reduced-till wheat trials, producing an extra 5 bu/A over broadcasting as shown in Figure 5. Kansas. Surface banding proved better than broadcasting in Kansas bromegrass trials. Banding 60 lbs/A of nitrogen raised forage yields to 5,000 210 Surface Banding Bushels per Acre Broadcast Average +15 205 176 175 155 163 174 +5 +9 +9 +14 +10 190 171 166 146 149 164 200 190 180 170 160 150 140 1.5% Drier 2.0% Drier 1.6% Drier 0.6% Drier 2.2% Drier 1.0% Drier
Fluid Journal 1993-1995
Fluid Journal 1999-2001