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Fluid Journal : Fluid Journal 2005-2007
Early Spring 2006 Starters Bump Corn Yields 17 bu/A Versus No-Starter Controls Dr. Gyles Randall and Jeff Vetsch Minnesota 2004 study showed that yields tended to be greater when sulfur was included in the starter in a wet, cool year. Fluid Journal 1 Historically, starter fertilizers commonly have not been recommended for corn production on high or very high phosphorus (P)-testing soils due to poor yield response even though early growth responses may have been seen. However, as corn yields have continued to increase, tillage intensity has tended to decrease and corn planting has come earlier accompanied by various stress Rate/A Placement Sources N P K S % 0+0+0+0 None None 3.78 0.409 3.35 0.225 6+20+6+4 Pop-up APP + KTS 3.51 0.423 3.46 0.201 20+20+6+4 2x0 APP + UAN + KTS 3.62 0.395 3.42 0.215 20+20+6+4 2x2 APP + UAN + KTS 3.64 0.390 3.23 0.216 20+20+0+4 2x0 APP + UAN + KTS 3.52 0.380 3.40 0.217 20+20+0+4 2x2 APP + UAN + KTS 3.60 0.386 3.30 0.206 20+20+6+0 2x0 UAN + 7-21-7 3.62 0.383 3.46 0.211 20+20+6+0 2x2 UAN + 7-21-7 3.82 0.385 3.14 0.224 20+20+10+10 2x0 APP+UAN+KTS+ATS 3.68 0.386 3.33 0.216 20+20+10+10 2x2 APP+UAN+KTS+ATS 3.74 0.406 3.43 0.224 20+40+10+10 2x0 APP+UAN+KTS+ATS 3.65 0.405 3.26 0.225 40+40+10+10 2x0 APP+UAN+KTS+ATS 3.83 0.402 3.00 0.221 Table 1. Concentrations of NPKS in whole small corn plant (V6) at Waseca, 2004. Summary: Concentrations of NPKS in the whole plant at the V6 stage were slightly but inconsistently affected by starter rates and placement positions. However, NPKS uptake at this stage was greatly affected by the starter rates due primarily to the huge effects of starter fertilizer rate and materials on dry matter yield. Corn grain yields in 2004 were increased an average of 17 bu/A by starter fertilizer treatments over the no-starter control. Yields were not increased statistically over that obtainedwiththe6+20+6+4pop- up treatment (199 bu/A). Yields tended to be greater when sulfur (S) was included in the starter fertilizer in this wet and cool year. Differences in yield were not found between the 2" x 0 and 2" x 2" placement positions indicating fl exibility in starter placement options. Grain moisture at harvest was reduced up to 4.6 points by starter fertilizer, resulting in lowered drying costs. Profitability was increased substan- tially on this very high P-testing soil (28 ppm Bray P1) by relatively low rates of NPKS starter fertilizers applied with the seed.
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