Dryland Soil Carbon and Nitrogen after Thirty Years of Tillage and Cropping Sequence

dc.contributor.author Sainju, Upendra
dc.contributor.author Allen, Brett
dc.contributor.author Lenssen, Andrew
dc.contributor.author Caesar-TonThat, TheCan
dc.contributor.author Lenssen, Andrew
dc.contributor.department Agronomy
dc.date 2018-02-18T01:47:14.000
dc.date.accessioned 2020-06-29T23:02:07Z
dc.date.available 2020-06-29T23:02:07Z
dc.date.embargo 2016-11-25
dc.date.issued 2014-01-01
dc.description.abstract <p>Little information is available about the long-term impact of tillage and cropping sequence on dryland soil C and N levels in the northern Great Plains. This study provided an opportunity to evaluate the effect of thirty years (1983-2013) of tillage and cropping sequence combination on dryland crop residue and soil organic (SOC) and inorganic C (SIC), soil total N (STN), NH<sub>4</sub>-N, and NO<sub>3</sub>-N contents at the 0- to 120-cm depth in eastern Montana. Treatments were no-till continuous spring wheat (NTCW), spring till continuous spring wheat (STCW), fall and spring till continuous spring wheat (FSTCW), fall and spring till spring wheat-barley (1984-1999) followed by spring wheat-pea (2000-2013) (FSTW-B/P), and spring till spring wheat-fallow (STW-F). Mean annualized crop biomass returned to the soil was lower in STW-F than in other treatments. At 0 to 7.5 cm, soil bulk density was greater in STW-F but SOC, SIC, and STN were greater in STCW than in other treatments, except NTCW, in 2013. The SIC at 90 to 120 cm was greater in NTCW and STCW than FSTCW and FSTW-B/P and STN at 30 to 60 cm was greater in NTCW and STW-F than in STCW and FSTW-B/P. The NH<sub>4</sub>-N content at 0 to 30 cm and NO<sub>3</sub>-N content at 0 to 120 cm were greater in FSTCW than in other treatments, except STCW. From 1983 to 2013, SOC at 0 to 7.5 cm declined from 104 kg C ha<sup>-1</sup> yr<sup>-1</sup> in STCW to 214 kg C ha<sup>-1</sup> yr<sup>-1</sup> in FSTW-B/P. Soil total (organic + inorganic) C was strongly related to SOC (<em>R</em><sup>2</sup> = 0.82, <em>P</em> ≤ 0.001, n = 168). Reduced tillage, followed by increased amount of crop residue returned to the soil, probably increased C and N storage and reduced the rate of decline in NTCW and STCW, but increased tillage intensity increased available N in FSTCW. Soil total C can be used as a substitute for SOC in dryland soils, which reduce the need to measure SICr</p>
dc.description.comments <p>This poster was presented at the ASA-CSSA-SSSA Annual Meeting, Long Beach, CA, November 2-5, 2014.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/agron_conf/26/
dc.identifier.articleid 1028
dc.identifier.contextkey 9414581
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath agron_conf/26
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/4364
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/agron_conf/26/2014_Sainju_DrylandSoil.pdf|||Fri Jan 14 23:01:03 UTC 2022
dc.subject.disciplines Agricultural Science
dc.subject.disciplines Agriculture
dc.subject.disciplines Agronomy and Crop Sciences
dc.title Dryland Soil Carbon and Nitrogen after Thirty Years of Tillage and Cropping Sequence
dc.type article
dc.type.genre poster
dspace.entity.type Publication
relation.isAuthorOfPublication 7f67ca95-722b-4dfd-8f49-56ff95980240
relation.isOrgUnitOfPublication fdd5c06c-bdbe-469c-a38e-51e664fece7a
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