Economic Evaluation of Wyoming Big Sagebrush (Artemisia tridentata) Control Methods

1989 ◽  
Vol 3 (4) ◽  
pp. 640-645 ◽  
Author(s):  
Myles J. Watts ◽  
Carl L. Wambolt
Keyword(s):  
Economic Evaluation ◽  
Treatment Response ◽  
Response Function ◽  
Control Method ◽  
Artemisia Tridentata ◽  
Perennial Grass ◽  
Economic Feasibility ◽  
Control Methods ◽  
Big Sagebrush ◽  
Wyoming Big Sagebrush

The economic feasibility of four Wyoming big sagebrush control methods: burning, spraying with 2,4-D, plowing and seeding, and rotocutting was analyzed. Perennial grass response to big sagebrush treatment was measured to estimate a treatment response function for each control method which provided the biological informational base to develop cost and benefits. Annualized present values of net additional returns for single 2,4-D and burning treatments were $1.10/ha and $1.16/ha, respectively. When big sagebrush was retreated at optimal intervals, 2,4-D and burning generated annualized net additional returns of $2.88/ha and $2.57/ha, respectively. Rotocutting was marginally feasible, and plowing was not feasible.

Mowing Wyoming Big Sagebrush (Artemisia tridentata ssp. wyomingensis) Cover Effects Across Northern and Central Nevada

2016 ◽  
Vol 69 (5) ◽  
pp. 360-372 ◽  
Author(s):  
Sherman R. Swanson ◽  
John C. Swanson ◽  
Peter J. Murphy ◽  
J. Kent McAdoo ◽  
Brad Schultz
Keyword(s):  
Artemisia Tridentata ◽  
Big Sagebrush ◽  
Wyoming Big Sagebrush

Economic Comparison of Mechanical and Chemical Weed Control

Weed Science ◽  
1968 ◽  
Vol 16 (3) ◽  
pp. 369-371 ◽  
Author(s):  
David L. Armstrong ◽  
J. K. Leasure ◽  
Mitchell R. Corbin
Keyword(s):  
Weed Control ◽  
Control Method ◽  
Economic Feasibility ◽  
Control Methods ◽  
Net Income ◽  
Small Item ◽  
Mechanical Methods ◽  
Two Factors ◽  
Complex Decision ◽  
Selection Of

The problem in determining the economic feasibility of mechanical, chemical, and combination weed control methods in corn (Zea mays L.) is a complex decision involving many factors. The effects of cost, yield, timeliness, and alternative uses of labor are the factors considered in comparing various methods of weed control in this study. Costs of weed control operations range from $2.84/A for two cultivations to $10.45/A for the most intensive, mechanical-chemical operation studied. Most common weed control methods have costs of approximately $3 to $4/A. Yields range from 83 bu/A for two cultivations to 96 bu/A with the highest cost chemical-mechanical weed control methods. All yields used in this study are supported by agronomic studies and are indexed on the basis of 100 bu/A for weed-free conditions. The consideration of both yields and costs does affect the selection of a weed control method. Considering only these two factors, mechanical methods have a slight advantage over chemical weed control methods. Penalizing mechanical methods because of delay or timeliness characteristics gives chemical methods an advantage by as much as $3.00/A. Alternative uses of labor, even though a common argument in selecting chemical or mechanical methods, is a very small item and has only moderate effects on the changes in net income.

Identifying key climate and environmental factors affecting rates of post-fire big sagebrush (Artemisia tridentata) recovery in the northern Columbia Basin, USA

2016 ◽  
Vol 25 (9) ◽  
pp. 933 ◽  
Author(s):  
Douglas J. Shinneman ◽  
Susan K. McIlroy
Keyword(s):  
Artemisia Tridentata ◽  
Fire Frequency ◽  
Mixed Effects Models ◽  
Sagebrush Steppe ◽  
Columbia Basin ◽  
Percentage Cover ◽  
Climate Conditions ◽  
Factors Affecting ◽  
Big Sagebrush ◽  
Wyoming Big Sagebrush

Sagebrush steppe of North America is considered highly imperilled, in part owing to increased fire frequency. Sagebrush ecosystems support numerous species, and it is important to understand those factors that affect rates of post-fire sagebrush recovery. We explored recovery of Wyoming big sagebrush (Artemisia tridentata ssp. wyomingensis) and basin big sagebrush (A. tridentata ssp. tridentata) communities following fire in the northern Columbia Basin (Washington, USA). We sampled plots across 16 fires that burned in big sagebrush communities from 5 to 28 years ago, and also sampled nearby unburned locations. Mixed-effects models demonstrated that density of large–mature big sagebrush plants and percentage cover of big sagebrush were higher with time since fire and in plots with more precipitation during the winter immediately following fire, but were lower when precipitation the next winter was higher than average, especially on soils with higher available water supply, and with greater post-fire mortality of mature big sagebrush plants. Bunchgrass cover 5 to 28 years after fire was predicted to be lower with higher cover of both shrubs and non-native herbaceous species, and only slightly higher with time. Post-fire recovery of big sagebrush in the northern Columbia Basin is a slow process that may require several decades on average, but faster recovery rates may occur under specific site and climate conditions.

scholarly journals Sagebrush Response to Conifer Cover

2015 ◽  
Vol 5 (1) ◽  
pp. 17
Author(s):  
Karen A. Kitchen ◽  
Brittany Goldsmith ◽  
Jim Robison-Cox ◽  
Michael Frisina ◽  
Bok Sowell
Keyword(s):  
Abiotic Factors ◽  
Artemisia Tridentata ◽  
Rocky Mountain ◽  
The United States ◽  
Douglas Fir ◽  
Conifer Species ◽  
Big Sagebrush ◽  
Canopy Area ◽  
Wyoming Big Sagebrush ◽  
The Relationship

<p class="emsd">Sagebrush habitat is declining throughout the United States. This can have negative impacts for big game as well as other wildlife species. The purpose of our research was to analyze the relationship between several abiotic factors and the cover of two conifer species, Douglas-fir (<em>Pseudotsuga menziesii</em>) and Rocky Mountain juniper (<em>Juniperus scopulorum</em>), on the cover of Wyoming (<em>Artemisia tridentata spp. wyomingensis</em>) and mountain (<em>Artemisia tridentata spp. Vaseyana</em>) big sagebrush. Abiotic factors, percent cover of sagebrush and conifers, and individual conifer age and canopy area were recorded at 40 Wyoming and 40 mountain big sagebrush plots at each of three study sites in southwest Montana (n = 240). No correlation was found between any abiotic factor and live sagebrush cover over all sites (p&gt;0.05). A model of the relationship between the combined cover of the two conifer species and the two subspecies of big sagebrush was developed. The best-fit model included the terms: study site, sagebrush subspecies,  and the interaction, study site by sagebrush subspecies as the independent variables, with as the dependent variable (  = Intercept<sub>i</sub>– 0.401 ; R<sup>2</sup> = 0.61). There was a negative relationship between conifer cover and sagebrush cover and no difference in the effects of conifer cover on the two sagebrush subspecies. Validation trials were successful at one of three locations outside the study area and suggested that the model is better suited to lower elevation, less productive sites. Individual Douglas-fir have a 3 fold larger canopy area than Rocky Mountain juniper at comparable ages (p&lt;0.001). Controlling conifers to increase Wyoming big sagebrush does not appear to be effective due to the low level of sagebrush cover. If conifer control is desired, Douglas-fir should be targeted over Rocky Mountain juniper on mountain big sagebrush sites, but not on Wyoming big sagebrush sites.</p>

Banking Wyoming big sagebrush seeds

2013 ◽  
Vol 14 (1) ◽  
pp. 60-70 ◽  
Author(s):  
R. P. Karrfalt ◽  
N. Shaw
Keyword(s):  
Big Sagebrush ◽  
Wyoming Big Sagebrush

Effect of fungicide on Wyoming big sagebrush seed germination

2011 ◽  
Vol 12 (3) ◽  
pp. 263-267 ◽  
Author(s):  
R. D. Cox ◽  
L. H. Kosberg ◽  
N. L. Shaw ◽  
S. P. Hardegree
Keyword(s):  
Seed Germination ◽  
Big Sagebrush ◽  
Wyoming Big Sagebrush

scholarly journals The Influence of Genetics in Myopia Control: A Pilot Study

2021 ◽  
Vol 10 (4) ◽  
pp. 808
Author(s):  
Cristina Alvarez-Peregrina ◽  
Miguel Ángel Sánchez-Tena ◽  
Clara Martinez-Perez ◽  
Catalina Santiago-Dorrego ◽  
Thomas Yvert ◽  
...  
Keyword(s):  
Pilot Study ◽  
Treatment Response ◽  
Axial Length ◽  
Contact Lenses ◽  
Control Method ◽  
Saliva Sample ◽  
Experimental Studies ◽  
Strong Linkage Disequilibrium ◽  
Student’S T ◽  
Myopia Control

Background: Many epidemiological and experimental studies have established that myopia is caused by a complex interaction between common genetic and environmental factors. The objective of this study was to describe and compare the allelic and genotypic frequencies of the rs524952 (GJD2), rs8000973 (ZIC2), rs1881492 (CHRNG), rs1656404 (PRSS56), rs235770 (BMP2), and rs7744813 (KCNQ5) SNPs (single-nucleotide polymorphism) between responder and nonresponder patients who had undergone a two-year treatment with lenses for myopia control. Method: Twenty-eight participants from the MiSight Assessment Study Spain (MASS), who had received treatment for myopia control for two years with MiSight contact lenses, were examined. The criteria for better/worse treatment response was the change in the axial length (< / ≥ 0.22 mm two years after the treatment). The clinical procedure consisted of the extraction of a saliva sample, and the participants also underwent an optometric examination. Genetic data were analyzed using SNPStats software (Catalan Institute of Oncology, Barcelona, Spain), and statistical analysis was performed using SPSS v.25 (SPSS Inc., Chicago, IL, USA). Demographic variables were analyzed using the Student’s t-test. Results: The T allele, the one with the lowest frequency, of the “rs235770” SNP was associated with a better treatment response [AL/CR (axial length/corneal radius): OR = 3.37; CI = 1.079–10.886; SE (spherical equivalent): OR = 1.26; CI: = 0.519–57.169; p = 0.019). By performing haplotype analysis, significant differences were found between the rs235770…rs1881492 and rs235770–rs1656404 polymorphisms. The latter presented a strong linkage disequilibrium with each other (r2 ≥ 0.54). Conclusion: The result of lens therapies for myopia control could vary depending on genetic variants. Studies with a larger sample are needed to confirm the results presented in this pilot study.

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