Agronomic and Economic Performance Characteristics of Conventional and Low-External-Input Cropping Systems in the Central Corn Belt Liebman, Matthew Gibson, Lance Sundberg, David Dixon, Philip Heggenstaller, Andrew Westerman, Paula Chase, Craig Hartzler, Robert Menalled, Fabian Davis, Adam Dixon, Philip
dc.contributor.department Statistics
dc.contributor.department Agronomy 2018-02-17T11:33:33.000 2020-07-02T06:57:53Z 2020-07-02T06:57:53Z 2008-01-01
dc.description.abstract <p>We conducted a 9-ha field experiment near Boone, IA, to test the hypothesis that yield, weed suppression, and profit characteristics of low-external-input (LEI) cropping systems can match or exceed those of conventional systems. Over a 4-yr period, we compared a conventionally managed 2-yr rotation system {corn (<em>Zea mays</em> L.)/soybean [<em>Glycine max</em> (L.) Merr.]} with two LEI systems: a 3-yr corn/soybean/small grain + red clover (<em>Trifolium pratense</em> L.) rotation, and a 4-yr corn/soybean/small grain + alfalfa (<em>Medicago sativa</em> L.)/alfalfa rotation. Synthetic N fertilizer use was 59 and 74% lower in the 3- and 4-yr systems, respectively, than in the 2-yr system; similarly, herbicide use was reduced 76 and 82% in the 3- and 4-yr systems. Corn and soybean yields were as high or higher in the LEI systems as in the conventional system, and weed biomass in corn and soybean was low (≤4.2 g m<sup>−2</sup>) in all systems. Experimentally supplemented giant foxtail (<em>Setaria faberi</em> Herrm.) seed densities in the surface 20 cm of soil declined in all systems; supplemented velvetleaf (<em>Abutilon theophrasti</em> Medik.) seed densities declined in the 2- and 4-yr systems and remained unchanged in the 3-yr system. Without subsidy payments, net returns were highest for the 4-yr system ($540 ha<sup>−1</sup> yr<sup>−1</sup>), lowest for the 3-yr system ($475 ha<sup>−1</sup> yr<sup>−1</sup>), and intermediate for the 2-yr system ($504 ha<sup>−1</sup> yr<sup>−1</sup>). With subsidies, differences among systems in net returns were smaller, as subsidies favored the 2-yr system, but rank order of the systems was maintained.</p>
dc.description.comments <p>This is an article from <em>Agronomy Journal</em> 100 (2008): 600, doi:<a href="" target="_blank">10.2134/agronj2007.0222</a>. Posted with permission.</p>
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dc.identifier archive/
dc.identifier.articleid 1055
dc.identifier.contextkey 8056962
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath stat_las_pubs/47
dc.language.iso en
dc.source.bitstream archive/|||Sat Jan 15 00:24:47 UTC 2022
dc.source.uri 10.2134/agronj2007.0222
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.disciplines Statistics and Probability
dc.title Agronomic and Economic Performance Characteristics of Conventional and Low-External-Input Cropping Systems in the Central Corn Belt
dc.type article
dc.type.genre article
dspace.entity.type Publication
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