Use of legume green manures as nitrogen sources for corn production

dc.contributor.author Liebman, Matt
dc.contributor.author Graef, Rhonda
dc.contributor.author Nettleton, Daniel
dc.contributor.author Nettleton, Dan
dc.contributor.author Cambardella, Cynthia
dc.contributor.department Statistics
dc.contributor.department Agronomy
dc.date 2019-08-23T22:44:03.000
dc.date.accessioned 2020-07-02T06:57:09Z
dc.date.available 2020-07-02T06:57:09Z
dc.date.issued 2012-09-01
dc.description.abstract <p>Recent volatility in supplies and prices of natural gas and synthetic nitrogen (N) fertilizer suggests a need to develop and refine alternative strategies for supplying N to corn. In this study, conducted in north-eastern Iowa, we examined the use of red clover and alfalfa green manures as means of supplying N to a succeeding corn crop. Red clover intercropped with oat produced significantly more biomass and contained more N than alfalfa intercropped with oat. Tilling green manures in the fall or delaying tillage until the following spring did not have a consistent effect on green manure N content. Without N fertilizer, corn grain yield following oat–red clover and oat–alfalfa was 25–63% greater than following oat grown alone, but at the highest fertilizer rate (202 kg N ha−1), there was no difference in corn yield between oat–legume and oat-alone treatments. These patterns support the premise that legume green manure effects on corn yield were N-related. Red clover green manure had an N fertilizer replacement value for corn of 87–184 kg N ha−1; alfalfa supplied corn with the equivalent of 70–121 kg N ha−1. At a fossil energy cost for N fertilizer of 57 MJ kg−1 N, reducing synthetic N fertilizer applications to corn by 70–184 kg N ha−1 would represent a fossil fuel savings of 3990–10,488 MJ ha−1, equivalent to the energy content of 104–274 m3 of natural gas. These types of savings are likely to become increasingly important as fossil energy supplies become scarcer and fertilizer prices rise.</p>
dc.description.comments <p>This article is published as Liebman, Matt, Rhonda L. Graef, Daniel Nettleton, and Cynthia A. Cambardella. "Use of legume green manures as nitrogen sources for corn production." <em>Renewable Agriculture and Food Systems</em> 27, no. 3 (2012): 180-191. doi: <a href="http://dx.doi.org/10.1017/S1742170511000299" target="_blank">10.1017/S1742170511000299</a>.</p>
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dc.identifier archive/lib.dr.iastate.edu/stat_las_pubs/201/
dc.identifier.articleid 1202
dc.identifier.contextkey 14841044
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath stat_las_pubs/201
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/90512
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/stat_las_pubs/201/2011_Nettleton_UseLegume.pdf|||Fri Jan 14 22:19:52 UTC 2022
dc.source.uri 10.1017/S1742170511000299
dc.subject.disciplines Agriculture
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.disciplines Soil Science
dc.title Use of legume green manures as nitrogen sources for corn production
dc.type article
dc.type.genre article
dspace.entity.type Publication
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