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

This Article Full Text (PDF) An erratum has been published An erratum has been published 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 Timmons, D. R. Articles by Baker, J. L. Search for Related Content PubMed Articles by Timmons, D. R. Articles by Baker, J. L. Agricola Articles by Timmons, D. R. Articles by Baker, J. L.

Fertilizer Management Effect on Recovery of Labeled Nitrogen by Continuous No-Till

USDA-ARS National Soil Tilth Laboratory, Iowa State Univ., Ames, IA 50011.
Agricultural and Biosystems Engineering Department, Iowa State Univ., Ames, IA 50011.

^* Corresponding author.

Improved fertilizer N management with respect to placement and timing is especially important in high-residue systems designed to improve N-use efficiency and to speed adoption of erosion controlling tillage practices. By means of point-injection technology, fertilizer solutions now can be applied and soil-incorporated with minimal disturbance of surface residue or existing plants. This study was conducted in large non-weighing lysimeters (with reconstituted soil horizons) to determine the recovery of ¹⁵N -labeled urea-ammonium nitrate (UAN) solution by continuous no-till corn (Zea mays L.) during the initial year of application and two subsequent years for four N management systems. The UAN solution was point-injected in split applications at rates of 125 or 200 kg N ha^–1, or knifed-in or surface-banded right after plant emergence at 200 kg N ha^–1. For the initial year of ¹⁵N application, the percent recovery of labeled N (N_R) in grain was 48, 39,33, and 30% for point-injected (low ratehplit), point-injected (high rate/split), knifed-in, and surface-banded, respectively. The percentage of total grain N derived from labeled N (N_F) ranged from 57 to 67% and was in the order of point-injected (high ratehplit) > knifedin > point-injected (low rate/split) > surface-banded. Residual labeled N recovery in grain ranged from 2.3 to 4.6% for the second season and from 0.9 to 1.0% for the third season with no significant differences among application treatments for either season. After five seasons the N_R values for labeled N determined in the soil N pool still ranged from 20 to 26%. UAN solution applied in split applications with the point injector was used more efficiently by corn than when knifed-in or surface-banded in a single application, indicating the point-injection/split application system is an option for improved N management in no-till corn.

Received for publication February 1, 1991.

This article has been cited by other articles:

				W. B. Stevens, A. D. Blaylock, J. M. Krall, B. G. Hopkins, and J. W. Ellsworth Sugarbeet Yield and Nitrogen Use Efficiency with Preplant Broadcast, Banded, or Point-Injected Nitrogen Application Agron. J., August 10, 2007; 99(5): 1252 - 1259. [Abstract] [Full Text] [PDF]

				D. B. Jaynes and T. S. Colvin Corn Yield and Nitrate Loss in Subsurface Drainage from Midseason Nitrogen Fertilizer Application Agron. J., October 3, 2006; 98(6): 1479 - 1487. [Abstract] [Full Text] [PDF]

				J.-H. Seo, J. J. Meisinger, and H.-J. Lee Recovery of Nitrogen-15-Labeled Hairy Vetch and Fertilizer Applied to Corn Agron. J., February 7, 2006; 98(2): 245 - 254. [Abstract] [Full Text] [PDF]