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Fluid Journal : Fluid Journal 1993-1995
2 Fluid Journal Fall 1993 25 49 96 116 133 142 NoN ST+43N ST+117N ST BCST+117N ST + 193N Fertilizer Treatment 140 80 20 Grain Yield - bu/A Figure 2. Effect of starter fertilizer and sidedessed N rate on corn grain yield, Test 2, Bertie County, NC, 1991. 100 50 Grain Yield - bu/A 104 80 111 105 BCST/43N+75NSD BDST/0N+117NSD Fertilizer Treatment Conventional Tillage No-Tillage Figure 3. Effect of tillage and fertilzer management on corn grain yield, Gates County, NC, 1991. effectively in a service mode. In fact, several agricultural consultants in North Carolina are tooling up to offer corn sidedressing recommendations to their customers. Fluid fertilizers will play a significant role in their efforts. Environmentally beneficial The above conclusions and ideas were supported by data collected in a multi-year project funded by the Fluid Fertilizer Foundation and Foundation for Agronomic Research. Of particular interest is an experiment conducted in 1991 on a high P soil in Bertie County, North Carolina. Results indicated that 15 gallons per acre of three starters (Figure 1) could support, for 42 days, corn dry weight equal to that produced by the same starter mixture plus 117 lbs/A N broadcast and incorporated prior to planting. Thus, the potential for off-site movement of N in response to spring thundershowers can be reduced significantly by use of only a starter fertilizer at planting (i.e., a substitution of timing and placement for rate). In addition to providing potential environmental benefits, use of a banded 10-34-0 starter increased yield by 17 bu/A at the Bertie County site (Figure 2, Test 2). It should not be overlooked that the 1:1 N:P starter, in contrast to the conventional 1:3.4 N:P 10-34-0, offers the opportunity to modestly reduce P application rates where soil P is very high. It is equally important to remember that P remains an essential component of the starter and that modest starter P applications are justifiable even on soils testing high in P. Obviously, total dependence upon starters for early-season corn nutrition demands that sidedressing be timely and well-planned. Although numerous studies, including our 1990 experiments, have demonstrated the benefits of split N applications on North Carolina's coarse-textured and organic soils, there was no advantage to sidedress versus at-planting N applications in 1991 at the Bertie County site, which was a loamy-sand soil. Failure of corn to respond to split N at that site was attributed to high residual N following peanuts and a lack of early-season rain.
Fluid Journal 1996-1998