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Fluid Journal : Early Spring 2012
05 The Fluid Journal Early Spring 2012 terms of erosion control, but can be a significant problem from the standpoint of seedbed preparation, early corn growth, and yield. The switch back to corn-dominated rotations presents a huge tillage challenge to corn producers on many poorly drained, colder soils of the northern Corn Belt because corn yields following corn are generally reduced significantly when conservation tillage practices are used. Our 2010 research has shown that many of the early growth and yield problems associated Summary: Early plant growth (plant heights and dry matter yields) was enhanced when nitrogen (N), phosphorus (P), and sulfur (S) starter fertilizers as 10-34-0 (APP), 28-0-0 (UAN) and 12-0-0-26 (ATS) were applied at the Waseca site, but only APP application affected early plant growth at the Rochester site. Corn grain yields were 6 to 9 bu/A greater with ATS (sulfur fertilization) at Waseca when averaged across APP and UAN treatments. A significant UAN x ATS interaction for grain yield showed when UAN was not applied at planting. Grain yields increased about 18 bu/A with ATS fertilization. When UAN was applied, no yield response to ATS was observed. This interaction data, along with N uptake data, suggest N loss was greater during the very wet June and July period and N supply was less when UAN was applied at planting, which probably reduced yields on those treatments. At Waseca, in-furrow application of one gallon of ATS and 4 gallons/A of APP increased grain yields 12 bu/A, compared with 4 gal/A of APP alone. No yield responses to NPS starter fertilizers occurred in Rochester. The site has a recent (2 years ago) history of fertilization with beef manure. It's likely mineralization from past manure applications provided adequate nutrients for corn in 2010 at the Rochester location. Starter ﬂuid combinations in conservation-till boost early plant growth and yields. Crop rotations in the Midwest have changed from the traditional corn- soybean rotation to more corn-intensive rotations. Due to the expanding demand for corn to supply the ethanol industry and the increasing insect and disease challenges facing soybean producers, some farmers are switching to a corn-corn-soybean rotation or, for some, continuous corn. These rotations produce large amounts of biomass (corn stover) that often remain on the soil surface because of present day tillage systems. This is good in The Fluid Journal • Ofﬁcial Journal of the Fluid Fertilizer Foundation • Early Spring 2012 • Vol. 20, No. 2, Issue# 76 Jeff Vetsch with corn after corn could be eliminated by using conventional tillage (i.e., moldboard plow) in combination with fluid starter fertilizers. Generally, for most northern Corn Belt farmers the moldboard plow is not an option because of increased potential for erosion, they don't own one anymore or have anyone who is skilled at operating one, or finally, they don't have the time themselves to plow. This research also showed fluid starter fertilizers (APP, 10- 34-0) applied in furrow, or APP and UAN (28-0-0) dribbled on the soil surface, Continuous Corn Yields Enhanced via NPS Combinations Figure 1. On left no starter. On right 4 gal/A of APP applied in-furrow plus 8 gal/A of UAN and 4 gal/A of ATS applied as a surface dribble band 2 inches to the side of the row (June 21, 2010).
Late Spring 2012