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Fluid Journal : Winter 2015
Russell French is CCA and DuPont/ Pioneer Account Manager, Robert Bowling is a DuPont/Pioneer Field Agronomist, Alyssa Abbott is a DuPont/ Pioneer Account Manager, and Mike Stewart is Central and Southern Plains Regional Director for IPNI. Table 3. 2010 Plot Averages by Nitrogen Timing No Post-Tassel Nitrogen Nitrogen Applied Brown Silk 19 Plots 21 Plots Avg Yield 217 bu/acre Avg Yield 248 bu/acre Low Yield: 170 bu/acre Low Yield: 183 bu/acre High Yield: 269 bu/acre High Yield: 302 bu/acre 3 Plots over 240+ bu/acre 14 Plots over 240+ bu/acre Table 4. Nitrogen Uptake, Timing and Quantities for Old and New Hybrids Era of Hybrid Release Nat Nat Post- Flowering Increase in Post- Flowering R1 R6 N Uptake N Uptake ----------l b s . N / A c r e---------- % Old (1940 to 1990)* 102 145 43 28 New (1991 to 2011) 97 152 55 Old (1970) ** 125 162 37 40 New (2000) 125 177 52 * Ciampitti and Vyn, 2012 ** Haegele, et al, 2013 grain elevator. One 120- acre field averaged 300 bu/A. Lower stalk nitrate tests revealed the majority of fields were in optimum to slightly excessive range with only a few fields in the marginal or excessive range. These proven principles from the Texas Panhandle have demonstrated positive results when replicated on an irrigated field in northeastern Illinois in 2013. Corn receiving the post-tassel N treatment had increased kernel depth, test weight, and stalk quality when compared with grain from the check that did not receive a post-tassel N application. Summing up Producer attendance at crop production clinics has increased over time through the use of private industry resources and coordination efforts with university Extension Specialists. Production clinics have facilitated high early adoption rates of practices described here, which we emphasize with our customers and include: 1. The importance of starter fertilizers in producing high yields, especially in no-till and strip-till. Combinations of pop-up and 2x2 or 2x0 are best or pop-up and a "hot" band 6 to 8 inches below the seed applied preplant, especially in no-till or strip- till or early planting in cold wet soils. 2. Banding nutrients is better than broadcasting for positional availability in strip-till and no-till. 3. Multiple applications of N are more efficient and result in higher yields (preplant, starter, pre- tassel applications through pivot and sidedress and post-tassel applications). 4. Post-tassel (post-flowering) applications of N can increase yields by increasing kernel depth and test weight. The newest corn hybrids use more N post-tassel than older hybrids of several years ago. Modern hybrids can respond well up to 33 percent of N goal going on between brown silk and dough stage. Specific practices that have been rapidly and widely adopted include strip- till and no-till, increased starter fertilizer use as a result of 2x0 surface banding, and movement away from 100 percent preplant N application to sidedress and fertigation applications. Other practices that have shown high adoption rates include in-season N application to fine tune N inputs and an increase in banding of immobile nutrients such as P and K in lieu of broadcast applications. A promising new practice that is currently being explored is center pivot applied N fertilizer at the R2 to R4 growth stages to improve corn yield through increased kernel depth and increased test weight. This practice allows later in-season adjustments of N application when environmental conditions favor higher yield potential, especially where water available for irrigation is limited by declining water tables or state mandated regulations. ACT NOW! JOIN IN THE SUPPORT OF THIS ORGANIZATION THAT DIRECTLY BENEFITS YOUR BUSINESS! The Fluid Fertilizer Foundation • 2805 Claflin Road, Suite 200, Manhattan, KS 66502 Write, call or e-mail the Fluid Fertilizer Foundation Phone: 785-776-0273 E-mail: email@example.com Research and education for efficient use of fluids. The Fluid Fertilizer Foundation We need you to join hundreds of other growers, dealers, fertilizer manufacturers and other supporting industries