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dc.contributor.authorRoundy, B. A.
dc.contributor.authorRuyle, G. B.
dc.contributor.authorArd, J.
dc.date.accessioned2020-09-24T02:52:01Z
dc.date.available2020-09-24T02:52:01Z
dc.date.issued1989-01-01
dc.identifier.citationRoundy, B. A., Ruyle, G. B., & Ard, J. (1989). Estimating production and utilization of jojoba. Journal of Range Management, 42(1), 75-78.
dc.identifier.issn0022-409X
dc.identifier.doi10.2307/3899663
dc.identifier.urihttp://hdl.handle.net/10150/645016
dc.description.abstractJojoba (Simmondsia chinensis) is a major evergreen browse species for livestock and wildlife throughout its range from central Arizona to northwest Mexico and Baja California. Current guidelines for grazing management are based on utilization levels as estimated from determining the percentage of twigs grazed. Utilization can be estimated more accurately from twig diameter measurements. On 3 sites in southern Arizona, leaf weight, stem weight and total weight were correlated with the square of twig internode diameter, having average r2 values of 0.81, 0.73, and 0.83, respectively, for small diameter twigs (less than or equal to 3mm) most frequently browsed. Estimates of twig weight from regression equations for the 3 sites varied less than 0.3 g and low standard errors of estimate (less than or equal to 0.33) indicate twig diameter measurements can give precise estimates of twig weight. Percent utilization of current year's growth can be calculated from estimates of twig weight remaining and twig weight removed by grazing from diameter measurements at initiation of current year's growth and at the point of grazing, respectively. On 2 sites, mean grazed twigs and mean weight utilization were similar for shrubs moderately grazed by cattle. However, regressions of weight utilization on percent twigs grazed indicated that percent twigs grazed could overestimate weight utilization of total twigs and underestimate weight utilization of current year's twigs, especially when utilization is high. An alternative to basing management of jojoba on time-consuming utilization measurements and arbitrary utilization limits is to monitor size of marked shrubs and manage for stable or gradually increasing shrub size.
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.subjectSimmondsia chinensis
dc.subjectwildlife
dc.subjectbrowse plants
dc.subjectwoody plants
dc.subjectrange management
dc.subjectbrowsing
dc.subjectlivestock
dc.subjectgrazing
dc.subjectArizona
dc.titleEstimating production and utilization of jojoba
dc.typetext
dc.typeArticle
dc.identifier.journalJournal of Range Management
dc.description.noteThis material was digitized as part of a cooperative project between the Society for Range Management and the University of Arizona Libraries.
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.volume42
dc.source.issue1
dc.source.beginpage75-78
refterms.dateFOA2020-09-24T02:52:02Z


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