Pasture Conditions at the Initiation of Grazing to Optimize Forage Productivity: A Progress Report

dc.contributor.author Kremer, Sonja
dc.contributor.author Russell, James
dc.contributor.author Strohbehn, Daryl
dc.contributor.author Morrical, Daniel
dc.contributor.author Barnhart, Stephen
dc.contributor.author Cowen, A.
dc.date 2018-02-12T23:37:49.000
dc.date.accessioned 2020-06-29T23:49:02Z
dc.date.available 2020-06-29T23:49:02Z
dc.date.copyright Sat Jan 01 00:00:00 UTC 2000
dc.date.issued 2000-01-01
dc.description.abstract <p>To determine environmental, soil, and sward effects at the initiation of cattle grazing in the spring on seasonal (forage accumulated during the grazing season) and cumulative (seasonal + initial forage mass) forage accumulation (FA), 15 commercial cow-calf producers from southern Iowa were selected by historical initial grazing date. At grazing initiation, twelve .25-m2 samples were hand-clipped from each pasture and sward heights (SH) measured with a falling plane meter (4.8 kg/m2) to determine initial forage mass. At each location, soil temperature and load bearing capacity (LBC) were measured and a soil sample was collected to measure pH and moisture, P, and K concentrations. Cumulative degree-days (base=3.85°C) and precipitation at grazing initiation were calculated from NOAA records. At the beginning of each month, at least three grazing exclosures were placed on each grazed pasture to determine monthly FA. SH in each exclosure was recorded, and a .25-m2 forage sample was hand-clipped proximate to each exclosure. At the end of each month, SH was recorded and .25-m2 hand-clipped forage samples from inside exclosures were obtained. In linear regressions, cumulative and seasonal SH increased with greater soil P (r2=.5049 and .5417), soil K (r2=.4675 and .4397), and initial forage mass (r2=.1984 and .2801). Seasonal SH increased with earlier initial grazing dates (r2=.1996) and less accumulated degree-days (r2=.2364). Cumulative and seasonal FA increased with earlier initial grazing dates (r2=.2106 and .3744), lower soil temperatures (r2=.2617 and.2874), and greater soil P (r2=.3489 and .2598). Cumulative FA increased with greater soil K (r2=.4675). In quadratic regressions, cumulative and seasonal SH were correlated to soil P (r2=.6310 and .5310) and soil K (r2=.5095 and.4401). Cumulative and seasonal FA were correlated to degree days (r2=.3630 and.4013) and initial grazing date (r2=.3425 and .4088). Cumulative FA was correlated to soil P (r2=.3539), and seasonal FA was correlated to soil moisture (r2=.3688).</p>
dc.format.mimetype PDF
dc.identifier archive/lib.dr.iastate.edu/beefreports_1999/17/
dc.identifier.articleid 1016
dc.identifier.contextkey 3188739
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath beefreports_1999/17
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/10981
dc.language.iso en
dc.relation.ispartofseries Animal Science Research Reports
dc.relation.ispartofseries ASL R1641
dc.source.bitstream archive/lib.dr.iastate.edu/beefreports_1999/17/asl_1641.pdf|||Fri Jan 14 21:09:06 UTC 2022
dc.subject.disciplines Animal Sciences
dc.subject.keywords ASL R1641
dc.title Pasture Conditions at the Initiation of Grazing to Optimize Forage Productivity: A Progress Report
dc.type article
dc.type.genre forage_utilization
dspace.entity.type Publication
relation.isSeriesOfPublication 7f3839b7-b833-4418-a6fa-adda2b23950a
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