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dc.contributor.authorGanskopp, Dave
dc.contributor.authorBohnert, Dave
dc.date.accessioned2020-09-18T05:08:02Z
dc.date.available2020-09-18T05:08:02Z
dc.date.issued2003-03-01
dc.identifier.citationGanskopp, D., & Bohnert, D. (2003). Mineral concentration dynamics among 7 northern Great Basin grasses. Journal of Range Management, 56(2), 174-184.
dc.identifier.issn0022-409X
dc.identifier.doi10.2307/4003902
dc.identifier.doi10.2458/azu_jrm_v56i2_ganskopp
dc.identifier.urihttp://hdl.handle.net/10150/643734
dc.description.abstractLivestock and wildlife managers must be aware of the nutritional dynamics of forages to sustain satisfactory growth and reproduction of their animals and assure fair value for pasture. Despite a history of livestock grazing in the northern Great Basin, annual and seasonal mineral concentrations of many of the region's prominent grasses have not been measured. We addressed this problem with monthly sampling (April-November) of 7 cool-season grasses at 6 sites during 1992, a drier than average year (86% of mean precipitation), and 1993 when precipitation was 167% of average (255 mm). Grasses included: Poa sandbergii Vasey, Bromus tectorum L., Sitanion hystrix (Nutt.) Smith, Agropyron spicatum (Pursh) Scribn. & Smith, Festuca idahoensis Elmer, Stipa thurberiana Piper, and Elymus cinereus Scribn. & Merr. Phosphorus, K, Ca, Mg, Mn, Fe, Cu, Zn, and Na were assayed, and initial statistical analysis was a split-split-plot with main effects of species, years, and months and all possible interactions. For a preponderance of the minerals, (Zn and Na excluded) the 3-way year x month x species interactions were significant (P < 0.05) indicating that main effects did not function independently. Generally, mineral concentrations averaged about 41% higher among the grasses for the drier of the 2 years (1992). Copper, Zn, and Na concentrations were below required levels for beef cattle (9.9, 28.8, and 672 mg kg-1, respectively) among all the grasses for all sampling periods. Seasonally deficient minerals included Ca, Mg, P, K, and Mn. Calcium and Mn were largely deficient (< 3.2 and 1.15 g kg-1, respectively) for beef cattle early in the growing season with levels rising as grasses matured. Seasonal patterns of Mg were variable among the grasses, increasing in some as the season progressed, remaining stable among others, and declining with maturity in yet others. Phosphorus and K levels were typically adequate (> 1.94 and 5.76 g kg-1, respectively) for beef cattle early in the growing season and declined to deficient levels by July and August. Iron was of no concern, because concentrations were more than adequate for cattle (> 48 mg kg-1) among all the grasses for all seasons. While a mixed stand of forages can extend the period of adequate mineral nutrition for cattle in some instances, we suggest that a supplement be available season-long on northern Great Basin rangelands and that the formulation include at least Ca, Mg, P, K, Cu, Zn, Mn, and Na in available forms and proper ratios.
dc.language.isoen
dc.publisherSociety for Range Management
dc.relation.urlhttps://rangelands.org/
dc.rightsCopyright © Society for Range Management.
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectcopper
dc.subjectzinc
dc.subjectmanganese
dc.subjectsodium
dc.subjectiron
dc.subjectphosphorus
dc.subjectmagnesium
dc.subjectpotassium
dc.subjectcalcium
dc.subjectPoa sandbergii
dc.subjectBromus tectorum
dc.subjectSitanion hystrix
dc.subjectAgropyron spicatum
dc.subjectFestuca idahoensis
dc.subjectStipa thurberiana
dc.subjectElymus cinereus
dc.titleMineral concentration dynamics among 7 northern Great Basin grasses
dc.typetext
dc.typeArticle
dc.identifier.journalJournal of Range Management
dc.description.collectioninformationThe Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information.
dc.eprint.versionFinal published version
dc.description.admin-noteMigrated from OJS platform August 2020
dc.source.volume56
dc.source.issue2
dc.source.beginpage174-184
refterms.dateFOA2020-09-18T05:08:02Z


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