HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Bandel, V. A. Articles by Stanford, G. Search for Related Content PubMed Articles by Bandel, V. A. Articles by Stanford, G. Agricola Articles by Bandel, V. A. Articles by Stanford, G.

Comparison of N Fertilizers for No-Till Corn¹

Little is known about the relative effectiveness of granular (UG) or prilled urea (UP), urea-ammonium nitrate solutions (UAN), and ammonium nitrate (AN) when top dressed for no-till corn. In most of the field studies reported, the N-fertilizer used with no-tillage has been ammonium nitrate, ammonium sulfate, or ammonium-based mixed fertilizers. We conducted field experiments for 3 years on three moderately well-drained Mattapex, Bertie, and Delanco silt loam soils (all Aquic Hapludults), comparing topdressed UG, UP, UAN solution (30% N), and AN at four N rates (45, 90, 135, and 180 kg/ha) on yields of continuous corn (Zea mays L). A zero N plot was included in each of the four replicates. Yields were significantly higher from AN than from other N sources in 1978 at Forage Farm and in 1976 and 1978 at Wye Institute. Average yield from UAN exceeded that from UP and UG at Wye Institute. In 1978, when rainfall was above normal, even at the highest rate of N (180 kg/ha) total N uptake was barely sufficient to obtain maximum yields at Forage Farm and Poplar Hill and was clearly inadequate at Wye Institute. With 180 kg/ha of N applied, N%TDM when gain had reached the dough stage was about 0.9 at Wye Institute and 1.1 at the other sites. Values associated with estimated maximum yields generally exceed 1.2%. In 1978, estimated recoveries of applied N were higher from AN than from the other N sources at Wye Institute and Forage Farm.

Key Words: Urea • Urea-ammonium nitrate solution • Ammonium nitrate • N fertilizer placement • N requirement of corn • Fertilizer N recovery

² Professor, Univ. of Maryland, associate professor (Academy of Agric., Szczecin. Poland); and soil scientist, BARC, USDASEA-AR, Beltsville, MD 20705.

Received for publication June 4, 1979.

This article has been cited by other articles:

				R. Khosla, M. M. Alley, and P. H. Davis Nitrogen Management in No-Tillage Grain Sorghum Production: I. Rate and Time of Application Agron. J., March 1, 2000; 92(2): 321 - 328. [Abstract] [Full Text]