Evaluation of Nitrification Inhibitors for No-Till Corn

Huber, D. M.; Warren, H. L.; Nelson, D. W.; Tsai, Chung‐Jung; Ross, M. A.; Mengel, D. B.

doi:10.1097/00010694-198212000-00008

Cited by 11 publications

(1 citation statement)

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“…Another approach for increasing FNUE is to maximize soil retention of fertilizer N by incorporation. Corn grain yields have sometimes been higher with subsurface than surface placement of urea‐ammonium nitrate (UAN) solution (Huber et al., 1982; Mengel et al., 1982; Stecker et al., 1993; Touchton & Hargrove, 1982); however, the predominant finding has been no significant difference between the two application techniques (Bundy et al., 1992; Eckert, 1987; Fox et al., 1986; Huber et al., 1982; Mengel et al., 1982; Murphy & Ferguson, 1997; Purucker & Steinke, 2020; Stecker et al., 1993; Timmons & Baker, 1992; Touchton & Hargrove, 1982). The latter finding is consistent with 15 N tracer studies showing no significant benefit of incorporation for increasing F 15 NUE (Karlen et al., 1996; Lara Cabezas et al., 2000), although the results are difficult to interpret because the UAN used was not dual‐labeled with both CO( 15 NH 2 ) 2 and 15 NH 4 15 NO 3 .…”

Section: Introductionmentioning

confidence: 99%

Isotopic evaluation of in‐season Y Drop applications for corn production

Griesheim

Mulvaney

Smith

et al. 2023

Soil Science Soc of Amer J

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A common strategy for improving fertilizer N uptake efficiency by corn (Zea mays L.) is to synchronize application with crop N demand during the growing season, which can be done using the Y Drop system recently developed for surface dribble placement. A 2‐yr field study was conducted using dual‐labeled urea‐ammonium nitrate (UAN) solution to compare fertilizer 15N uptake efficiency (F15NUE) for surface and subsurface sidedress applications to soils of contrasting fertility under either second‐year corn or a corn–soybean [Glycine max (L.) Merr.] rotation. Besides placement, treatments were designed to allow comparison of 15N uptake from UAN applications made at planting vs. at the V9 growth stage. The importance of soil N supply was demonstrated by estimates of N derived from fertilizer that ranged from 17 to 47% in total aboveground biomass and never exceeded N derived from soil. Of the fertilizer N recovered in the crop at harvest, the majority originated from the 15N applied at sidedressing rather than at planting. The range in F15NUE was from 12 to 42% (26% on average) for grain and from 14 to 51% (31% on average) for total aboveground biomass, the only significant difference occurring when the subsurface treatment outperformed Y Drop placement under conditions conducive to urea N loss through NH3 volatilization. Both methods of application offer the same fundamental advantage, in that fertilizer N is supplied during the period of maximal crop uptake.

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