Soil water dynamics under various agricultural land covers on a subsurface drained field in north-central Iowa, USA Helmers, Matthew Qi, Zhiming Helmers, Matthew Kaleita, Amy Kaleita, Amy
dc.contributor.department Agricultural and Biosystems Engineering 2018-02-14T19:19:36.000 2020-06-29T22:41:13Z 2020-06-29T22:41:13Z Fri Jan 01 00:00:00 UTC 2010 2014-09-27 2011-02-01
dc.description.abstract <p>Modification of land cover systems is being studied in subsurface drained Iowa croplands due to their potential benefits in increasing soil water and nitrogen depletion thus reducing drainage and NO<sub>3</sub>–N loss in the spring period. The objective of this study was to evaluate the impacts of modified land covers on soil water dynamics. In each individual year, modified land covers including winter rye–corn (rC), winter rye–soybean (rS), kura clover as a living mulch for corn (kC), and perennial forage (PF), as well as conventional corn (C) and soybean (S), were grown in subsurface drained plots in north-central Iowa. Results showed that subsurface drainage was not reduced under modified land covers in comparison to conventional corn and soybean. Soil water storage (SWS) was significantly reduced by PF treatments during the whole growing seasons and by kC during May through July when compared to the cropping system with corn or soybean only (<em>p</em> < 0.05). Treatments of rC and rS typically maintained higher SWS than C and S, respectively, during the 3 years of this study. In the spring during a 10–15-day period when the rainfall was minimal, SWS in plots with rye, kura clover, and forage decreased at a significantly higher rate than the C and S plots which were bare. Estimated evapotranspiration (ET) during this period was significantly higher in rS, kC, and PF treatments than C and S. The results of this study suggested that significantly higher ET and similar drainage for modified land covers may increase water infiltration, which would be expected to reduce surface runoff thus to decrease stream flow. Because subsurface drainage reduction was not seen in this study, impact of modified land covers on NO<sub>3</sub>–N loss needs further investigation.</p>
dc.description.comments <p>This is a manuscript of an article published as Qi, Zhiming, Matthew J. Helmers, and Amy L. Kaleita. "Soil water dynamics under various agricultural land covers on a subsurface drained field in north-central Iowa, USA." <em>Agricultural Water Management</em> 98, no. 4 (2011): 665-674. DOI: <a href="" target="_blank">10.1016/j.agwat.2010.11.004</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/
dc.identifier.articleid 1888
dc.identifier.contextkey 6175446
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_pubs/605
dc.language.iso en
dc.source.bitstream archive/|||Sat Jan 15 01:15:04 UTC 2022
dc.source.bitstream archive/|||Sat Jan 15 01:15:05 UTC 2022
dc.source.uri 10.1016/j.agwat.2010.11.004
dc.subject.disciplines Agriculture
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.disciplines Water Resource Management
dc.subject.keywords Soil water dynamics
dc.subject.keywords Rye cover crop
dc.subject.keywords Kura clover
dc.subject.keywords Perennial forage
dc.title Soil water dynamics under various agricultural land covers on a subsurface drained field in north-central Iowa, USA
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 26a812e6-e6de-44ff-b7ea-d2459ae1903c
relation.isAuthorOfPublication 8a405b08-e1c8-4a10-b458-2f5a82fcf148
relation.isOrgUnitOfPublication 8eb24241-0d92-4baf-ae75-08f716d30801
Original bundle
Now showing 1 - 2 of 2
248.93 KB
Adobe Portable Document Format
135.25 KB
Microsoft Word XML