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Fluid Journal : Fluid Journal 2002-2004
2 Fluid Journal Winter 2003 Wheat Objective of this study was to measure the difference between alternative placement methods using a liquid starter, as well as evaluate the difference between starter N rates. Fertilizer source. Liquid sources used were 11-37-0 and 30 percent UAN. Fertilizer rates. Fall applied starter N rates were 20, 40, and 60 lbs/A. The 11- 37-0 starter was used at a constant rate of 8.4 gal/A to supply the fall P. Additional N was added to the 11-37-0 to give varying starter N rates. The experimental site received a uniform application of 140 lbs/A of K2O, which was disked into the soil before planting. All plots received 60 lbs/A of N at spring greenup. This was a blend of 30 percent UAN and 8-0-0-9 to give 21 and 24 lbs/A of ammonium nitrogen and sulphate sulfur, respectively. Placement. Broadcast and in-row applications were compared. Broadcast treatments were applied using a custom- made CO2 charged bicycle sprayer. After application the soil was disked twice before planting. The in-row applications were made as the individual plots were being planted. Spring greenup liquid solution was streamed on in 10-inch spacings. Planting. A custom-made 17-row by 4-inch planter, equipped with a 5-gallon tank and application tubes running to each row opener, was used for the in- row treatments. As can be seen in Figure 2, when more than 20 lbs/A of N was applied in-row, yields appear to decrease. The surface- applied starter rates all performed better than the in-row treatments, except at the 20-lb/A rate. If additional spring nitrogen had been applied, quite possibly the 20-lb/A starter N treatment would have been as good or better than the broadcast treatments. Pros/cons Broadcasting. An advantage of broadcasting starter is N along with P and K can be applied in one application, thus saving time and labor, along with equipment charges. A disadvantage is it appears 20 lbs/A of starter N is not sufficient. Between 30 to 40 lbs/A may be required. In-row application. One advantage is the grower may get by with less starter N. A disadvantage would be a slowing of the planting process. The producer would have to handle a fertilizer solution as well as small grain seed. Mulford is manager of the Poplar Hill Facility in Quantico, Maryland
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