Journal of Range Management, Volume 39, Number 3 (May 1986)
http://hdl.handle.net/10150/635580
2024-03-28T09:11:15ZJournal of Range Management, Volume 39, Number 3 (May 1986)
http://hdl.handle.net/10150/650498
Journal of Range Management, Volume 39, Number 3 (May 1986)
Complete digitized issue.
1986-05-01T00:00:00ZThe Impact of Experimental Design on the Application of Grazing Research Results: An Exposition
http://hdl.handle.net/10150/645403
The Impact of Experimental Design on the Application of Grazing Research Results: An Exposition
Brown, M. A.; Waller, S. S.
Funding limitations often restrict pasture replication in grazing research on rangeland. Consequently, subsample error has been used to estimate treatment effects or characterize populations. Assumptions associated with experimental designs which utilize subsample error to make inferences are discussed and an example evaluated. The appropriate experimental unit for inferential grazing research is the pasture. Animals or vegetation sampling within pastures must be considered as subsamples in inferential grazing research. Pasture replication must be used in intensive grazing trials to establish treatment differences or provide adequate characterization. Following intensive trials, extensive, unreplicated trials implemented by private producers can be effective in establishing broad-based applicability. Unreplicated pasture trials may also be used for screening several treatments.
1986-05-01T00:00:00ZThe Distribution of Halogeton in North America
http://hdl.handle.net/10150/645402
The Distribution of Halogeton in North America
Pemberton, R. W.
Halogeton [Halogeton glomeratus (Stephen ex Bieb.) C.A. Mey.], a livestock-poisoning plant from central Asia, occurred in most Great Basin states in 1954. Current distribution of the species was studied by surveying botanists, weed scientists and other specialists in 1980. The survey indicated that halogeton had spread into additional counties in all states occupied in 1954 and into southern California, New Mexico, and east of the Rocky Mountains to Nebraska. The largest infestations continue to be in the Great Basin and Wyoming.
1986-05-01T00:00:00ZTechnical Notes: Evaluation of the Dry-Weight-Rank Method for Determining Species Composition in Tallgrass Prairie
http://hdl.handle.net/10150/645398
Technical Notes: Evaluation of the Dry-Weight-Rank Method for Determining Species Composition in Tallgrass Prairie
Gillen, R. L.; Smith, E. L.
The dry-weight-rank (DWR) method for determining species composition of tallgrass prairie vegetation was compared to hand clipping. Species composition estimates for the 2 methods were similar in 3 of 4 trials when true ranking and previously published multipliers were used. Weighting the DWR estimates by plot total weight did not consistently improve the accuracy of the method. Observer errors reduced the accuracy of DWR, emphasizing the need for observer training. DWR estimates were generally less precise than hand clipped estimates for a given sample size but the speed of DWR would allow more samples to be taken resulting in more precise estimates in practice.
1986-05-01T00:00:00Z