Recovery of Point-Injected Labeled Nitrogen by Corn as Affected by Timing, Rate, and Tillage

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dc.contributor.author Timmons, D.
dc.contributor.author Baker, J.
dc.contributor.department Agricultural and Biosystems Engineering
dc.date 2018-02-18T05:18:26.000
dc.date.accessioned 2020-06-29T22:42:41Z
dc.date.available 2020-06-29T22:42:41Z
dc.date.issued 1991-09-01
dc.description.abstract <p>Point-injection technology is being developed to improve fertilizer management, particularly N management. This study was conducted to evaluate the effects of the rate (number) and timing of point-injections of an ammonium nitrate (NH<sub>4</sub>NO<sub>3</sub>) solution on N uptake and corn growth and to measure any differences due to tillage. Nitrogen-15 depleted NH<sub>4</sub>NO<sub>3</sub> (AN) was hand-injected beside individual plants at the V1, V5, and/or V9 growth stages at rates of 50, 100, and/or 200 kg N ha<sup>−1</sup> with fall moldboard plow (MP), fall chisel plow (CP), and ridge-till (RT) systems. While MP had the highest grain and total dry matter production (but with the lowest N concentrations in those materials), tillage was not a significant factor in either the percentage of the total plant N derived from labeled AN (N<sub>F</sub>) or its recovery (N<sub>R</sub>) for any stage sampled. Generally the year (i.e. different environmental conditions) and application timing or a timing-by-year interaction had the greatest influence on N<sub>F</sub> and N<sub>R</sub>. Although plants sampled at the V9 stage on the average recovered more N from the V1 application (39%) vs the V5 application (27%), at maturity N<sub>R</sub> values for grain (35%) and total dry matter (47%) were the same for both V1 or V5 applications (when only two applications were made). However when three applications were made (at the V1, V5, and V9 stages), N<sub>R</sub> values decreased with time of application for both grain (38, 31, and 26%, respectively) and total dry matter (53, 43, and 33%, respectively). Across application timing, grain N<sub>R</sub> values were 34 and 31%, respectively, for MP and RT. Compared with preplant knifed-in labeled N for MP and RT systems in an adjacent simultaneous study, grain N<sub>R</sub>values for point-injected N in this study were 16 and 6% greater, respectively, indicating that multiple injections of fertilizer N improved N-use efficiency.</p>
dc.description.comments <p>This article is from <em>Agronomy Journal</em> 83 (1991): 850–857.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/abe_eng_pubs/792/
dc.identifier.articleid 2071
dc.identifier.contextkey 9806393
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_pubs/792
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/1593
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/abe_eng_pubs/792/1991_Timmons_RecoveryPoint.pdf|||Sat Jan 15 01:56:14 UTC 2022
dc.source.uri 10.2134/agronj1991.00021962008300050016x
dc.subject.disciplines Agriculture
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.title Recovery of Point-Injected Labeled Nitrogen by Corn as Affected by Timing, Rate, and Tillage
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isOrgUnitOfPublication 8eb24241-0d92-4baf-ae75-08f716d30801
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