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Fluid Journal : Fluid Journal 2002-2004
Table 3. Effects of tillage and N rate on corn* Manhattan Belleville V6 V6 Variable Dry wt Yield Dry wt Yield lbs/A bu/A lbs/A bu/A Tillage: Strip-till 429 182 264 57 No-till 325 154 168 45 N rate (lbs/A): 0 301 146 130 40 40 417 169 221 49 80 423 177 236 54 120 367 181 276 61 * averaged across treatments receiving fertilizer at planting time Spring 2004 Fluid Journal 3 No significant difference existed between fertilizer applications made in the fall with the strip-till operation as compared to applying fertilizer in the spring after fall strip-till (Table 2). Results suggest that under similar conditions, fertilizer can be applied during fall strip-till without concern of yield reduction. Nitrogen (N) rate effects varied by location and previous crop, but increas- ing N rates generally increased grain yields. Methodology Soil was a Crete silty clay loam at Belleville, a Reading silty loam at Manhattan, and a Woodson silty clay loam at Ottawa. Tillage. A four-row strip-till rig was used in the fall to disturb the soil to a depth of approximately 6 inches in the row with a 4- to 5-inch wide area of residue-free soil over the row. Inter-row regions were left undisturbed. Fertilizer treatments included either 40, 80, or 120 lbs/A of N applied with 30 lbs/ A of P2O5, 5 lbs/A of K2O, and 5 lbs/A of S. Placement. Fertilizer was placed approximately 5 to 6 inches deep with the strip-till operation or in a 2 x 2 placement with the planter on no-till plots and strip-till plots receiving spring application. Ms. Ferdinand is graduate research assistant, Dr. Lamond is professor, Dr. Gordon is professor, Dr. Janssen is professor, and Mr. Godsey is research assistant, Department of Agronomy, KSU.
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