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Fluid Journal : Fluid Journal 2008-2009
Dr. Tony J. Vyn and Terry West !"#$%&' !"#$%&'()*+,-&'(*"(./0(1'+%2(10,.%'%30,(1*+-2&.%*- !"#$%! !"#$%&'()*+%,--. /012%345%602%75%899:$%;<= !"#$%&'()(*#+,-).,*/0)1*2)3* 4515%).)1-*/0-'61,*768*9681*"86(&:)8, !"#"$%&'(#)*+,"'%(-"*(#"&&'./'$"*,'.0"12%(.#&3'*"&&'.0"12%.1'/2%(4+"3'1",+)%(.#' (#'(#0+%'"50"#&"&'6"7473'*"&&'.8"1*20'(#'&"",'2#,'/"1%(*(9"1'200*()2%(.#&:3'2#,'%;"' .00.1%+#(%<'%.'2);("8"'.0%(-+-'0.&(%(.#&'./').1#'1.=&'1"*2%(8"'%.'#+%1("#%'>2#,&7 Summary: In using the most precise automatic guidance system available (real-time kinematic or RTK), planting corn directly over preplant UAN bands (at all nitrogen [N] rates) increased plant N concentrations in whole plant samples taken approximately one month after seeding at each of three locations. Micronutrient concentrations of manganese (Mn) and/or zinc (Zn) also tended to be higher as corn rows were positioned closer to preplant UAN bands. Corn plant populations and grain yields were frequently reduced when corn rows were positioned directly over UAN bands at N rates of 100 or 200 lbs/A of N, but not when preplant N rates were 50 lbs/A or when corn rows were positioned 5 or 10 inches away from the higher preplant N rates. Starter fertilizer application had little effect on corn population, height or yield response to proximity of the preplant UAN bands, but starter did increase early-season heights and plant N and phosphorus (P) concentrations as expected. We conclude that RTK guidance is highly advantageous when planting no-till or tilled corn soon after preplant banded UAN application, and that the optimum corn row position for a “safe” response shortly after UAN application at high rates is at least 5 inches from and parallel to the UAN band. Recent developments in GPS- guided automatic steering systems have opened up many new management options for corn producers. Automatic guidance devices have provided benefits in terms of improved timeliness of field operations, less operator fatigue, reductions in overlapping applications of pesticides and fertilizers, controlled traffic system opportunities, as well as reduction in capital expenses (such as the possible elimination of row markers on corn planters or the use of strip tillage tools that are only half to two-thirds of the corn planter width). The economic merits of automatic steering devices are still being debated as are the relative merits of automatic guidance systems with varying degrees of accuracy. Our interest in combining no-till and strip-till operations with fluid fertilizer banding grew over years of researching and promoting strip tillage and deep banding of fertilizer for high-yield corn production systems. The objectives of this three- year research (2006 to 2008) were to: Determine the realistic joint benefits associated with automatic guidance systems for both UAN banding and planting systems in no-till corn Quantify the effects of various degrees of planter precision (relative to preplanting UAN bands) on corn nutrient uptake, growth, and yield Determine whether the combination of automatic guidance systems and preplant banded UAN application would circumvent the need for fluid starter applicators on corn planters. West Lafayette Over a three-year period (2006 to 2008), corn plant heights following preplant UAN application were most
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