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- Western Australia (16)
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Articles 1 - 30 of 40
Full-Text Articles in Physical Sciences and Mathematics
Pasture Condition Guides For The Pilbara, A L. Payne, A A. Mitchell
Pasture Condition Guides For The Pilbara, A L. Payne, A A. Mitchell
Agriculture reports
These pasture condition guides are relevant to about 192 000 square kilometres of the Pilbara region of Western Australia. The rangeland of the Pilbara can be separated into 12 very broad pasture types. The ‘pasture type’ is not strictly a botanical classification because, in determining such a class of pastoral lands, the perennial plant species that contribute to stock production have an over-riding importance. Even so, each pasture type represents a broad group of similar vegetation associations or ‘site types’ which will have similar management requirements for pastoralism. The aim of this publication is to provide pastoralists with descriptions and …
Land-Use And Vegetation In Western Australia : Project Daw27 : National Land And Water Resources Audit, G R. Beeston, A Jm Hopkins, D P. Shepherd
Land-Use And Vegetation In Western Australia : Project Daw27 : National Land And Water Resources Audit, G R. Beeston, A Jm Hopkins, D P. Shepherd
Resource management technical reports
This report details a project to compile detailed land-use data for Western Australia, on pre-European and present vegetation types, and aspects of disturbance of or threats to the present vegetation. Metadata on botanical surveys throughout the state were also compiled.
Sustainability Issues For Agriculture In Western Australia, Anne Bennett, Ross Kingwell, Ross George
Sustainability Issues For Agriculture In Western Australia, Anne Bennett, Ross Kingwell, Ross George
All other publications
Agriculture has been and will continue to be a major component of economic activity in several regions in Western Australia, and agricultural communities will remain an important part of the social fabric and landscape of the State. Promoting the sustainability of agriculture is likely to produce three main outcomes: vibrant rural communities; profitable agricultural systems; and conservation of the natural environment. This paper describes briefly the main challenges to the sustainability of agriculture and outlines some means of responding to the challenges: market-based approaches; agricultural and environmental research and development; accelerated adjustment; and global and national policy initiatives.
Phillips Brook Catchment Appraisal, Paul D. Galloway
Phillips Brook Catchment Appraisal, Paul D. Galloway
Resource management technical reports
This report describes the soils, hydrology and natural vegetation of the Phillips Brook catchment near Toodyay, Western Australia and provides information on the threats to agriculture, infrastructure and natural resources from salinity, waterlogging, erosion and other land degradation processes.
Groundwater Study Of The Wandering Townsite, S Ghauri
Groundwater Study Of The Wandering Townsite, S Ghauri
Resource management technical reports
A groundwater study was carried out in the townsite of Wandering, Western Australia. This report describes the town and its catchment, the hydrogeological investigation characterising groundwater flow systems within the townsite, and recommends actions for managing salinity risk.
Groundwater Study Of The Trayning Townsite, Louise Hopgood
Groundwater Study Of The Trayning Townsite, Louise Hopgood
Resource management technical reports
A groundwater study was carried out in the townsite of Trayning, Western Australia. The study presents a model of the hydrogeology below the town and defines management options to help limit damage to infrastructure from surface water, shallow subsurface water and deep groundwater. A drilling program and expansion of the network of monitoring bores were also part of the study.
Cranbrook-Toolbrunup : Catchment Appraisal Report 2001, Tim D. Overheu, Western South Coast Catchment Appraisal Team (Wa)
Cranbrook-Toolbrunup : Catchment Appraisal Report 2001, Tim D. Overheu, Western South Coast Catchment Appraisal Team (Wa)
Resource management technical reports
This report covers the eastern junction of both the Pallinup North Stirling and Kent Frankland sub-regions, comprising of six amalgamated sub-catchments of Pingelup Creek, Solomons Creek, Racecourse Lake, Lake Toolbrunup, Twolganup Brook and Hamilla Hill (west). This report primarily focuses on the agricultural and natural resources at risk within the study area and attempts to identify options to manage the potential risks.
Roundtable Series On Innovative Approaches To Land Conservation And Smart Growth, New England Environmental Finance Center
Roundtable Series On Innovative Approaches To Land Conservation And Smart Growth, New England Environmental Finance Center
Smart Growth
A series of six roundtable discussions was conducted by the New England Environmental Finance Center (NE/EFC) from January through May 2002, one in each New England state. The objectives of the series were to consolidate expertise in financing and coordinating projects that combine conservation and development on the landscape, and to identify key areas of unmet need that could be addressed by the NE/EFC. Each discussion entailed several case study presentations and facilitated discussion about what works, what doesn’t work, and what might work in financing and coordinating efforts that combine conservation and development. Key areas of opportunity that emerged …
Developing An Environmental Management System (Ems) For Viticulture, Catherine Nind
Developing An Environmental Management System (Ems) For Viticulture, Catherine Nind
Agriculture reports
This guidebook outlines one approach that may be used to develop an Environmental Management System (EMS) for a vineyard. The system described in this guidebook facilitates a continual improvement in environmental management and can be used to demonstrate a commitment to responsible land management. The system is generally consistent with the requirements of ISO 14001: the internationally accepted standard for an EMS.
Profitable And Productive Farming Systems For Management Of Nolba Catchment, B R. Eastough, Nolba Focus Catchment Group
Profitable And Productive Farming Systems For Management Of Nolba Catchment, B R. Eastough, Nolba Focus Catchment Group
Resource management technical reports
Summary of the main points covered at each of the several workshop and two demonstrations by the Nolba Catchment Group, Western Australia. The areas addressed include: low recharge farming systems; impact on the environment of integrated weed management; management of organic matter in soils within the catchment; dune stabilisation and groundwater hydrology.
Bioavailability/Toxicity Of Iron From Aerobically Processed Organic Fertilizer, Stacey Marie Wilson
Bioavailability/Toxicity Of Iron From Aerobically Processed Organic Fertilizer, Stacey Marie Wilson
Undergraduate Honors Capstone Projects
For an undergraduate Honor's project, I worked under the direction of Dr. Jeffery Hall to determine the bioavailability and toxicity of iron from Milorganite® fertilizer, an aerobically processed organic fertilizer. The Milorganite® Company is a subsidiary of the Milwaukee Municipal Sewage District and produces a fertilizer of high iron content (approximately 5-7%). The high iron content has resulted in concern about the toxic potential, which until now was unknown. This thesis paper will explain iron chemistry, bioavailability, requirements, absorption, toxicity, and treatments, followed by a description of fertilizer types and contents. This will be followed by a description and reasoning …
Spatial Modeling Of Biomass In Nebraska Windbreaks, Qingjiang Hou, Linda J. Young, James R. Brandle, Michele M. Schoeneberger
Spatial Modeling Of Biomass In Nebraska Windbreaks, Qingjiang Hou, Linda J. Young, James R. Brandle, Michele M. Schoeneberger
Conference on Applied Statistics in Agriculture
Field windbreaks have the potential of sequestering large amounts of carbon. Predicting how much carbon would be sequestered in a newly planted windbreak after ten or more years is of interest. The amount of carbon in a tree depends on its biomass. In a pilot study of Nebraska windbreaks, a Markov random field was used to predict the biomass of green ash in windbreaks as a function of soil and climate conditions. The spatial dependence parameter was significantly different from zero, indicating the presence of small scale variation. In addition to age, the 30 year average summer precipitation and the …
Effect On Boll Weight Of Cotton Plants Planted At Various Densities, B. G. Mullinix, C. W. Bednarz
Effect On Boll Weight Of Cotton Plants Planted At Various Densities, B. G. Mullinix, C. W. Bednarz
Conference on Applied Statistics in Agriculture
Previous research has shown that yield of cotton increases with plant density until density reaches 16 to 20 plants m-2. In 1997 and 1998 cotton was planted at various densities ranging from 2.5 to 22.5 plants m-2 in a RCB design. Ten row feet (3.048 m) of cotton were cut at ground level in each plot and placed into separate bags. Plant density for each plot was found by counting the number of plants in the bag representing that plot. For each plant, a boll found was placed in a small bag representing the fruiting branch and …
Simulation And Response Surface Methodology To Optimize Winter Wheat Response To Global Climate Change, P. Dhungana, K. M. Eskridge, A. Weiss, P. S. Baenziger
Simulation And Response Surface Methodology To Optimize Winter Wheat Response To Global Climate Change, P. Dhungana, K. M. Eskridge, A. Weiss, P. S. Baenziger
Conference on Applied Statistics in Agriculture
Future climate changes can have a major impact on crop production. But, whatever the climatic changes, crop production can be adapted to climate change by implementing alternative management practices and developing new genotypes that will take full advantage of the future climatic conditions. Since the classical agronomic research approach is not possible in identifying these new agronomic technologies for the future climatic conditions, we used response surface methodology (RSM) in connection with the CERES-Wheat crop model and the HADCM2 climate simulation model to identify optimal configuration of plant traits and management practices that maximize yield of winter wheat under high …
Using Nonlinear Fixed And Mixed Models To Study Acclimation To Heat Stress In Cattle, L. Lan, A. M. Parkhurst, D. A. Spiers, K. M. Eskridge, G. L. Hahn
Using Nonlinear Fixed And Mixed Models To Study Acclimation To Heat Stress In Cattle, L. Lan, A. M. Parkhurst, D. A. Spiers, K. M. Eskridge, G. L. Hahn
Conference on Applied Statistics in Agriculture
Researchers studying acclimation of cattle to heat stress want to know if exposure to heat stress in controlled chambers will help cattle adjust to climatic conditions in the field. The four parameter nonlinear PET model is used to study the relationship between core body temperature and ambient temperature. This model works well when cattle are challenged by heat stress but the model is less useful for thermoneutral conditions. Both proc Nlin and Nlmixed are used to compare and contrast the field parameters between the controlled and the potentially acclimated group. Simulation studies were used to compare the effectiveness of proc …
Spline Models For Estimating Heat Stress Thresholds In Cattle, A. M. Parkhurst, D. A. Spiers, G. L. Hahn
Spline Models For Estimating Heat Stress Thresholds In Cattle, A. M. Parkhurst, D. A. Spiers, G. L. Hahn
Conference on Applied Statistics in Agriculture
Studies of the relationship between animal body temperature and air temperature suggest body temperature is essentially unresponsive until a threshold is reached, then it responds dramatically to increasing air temperature. The goal is to estimate the threshold between the thermoneutral plateau and the beginning of the heat stress challenge. One approach is to fit a polynomial to estimate the knot position and use spline functions to perform linear least squares piecewise polynomial fitting. Another alternative is to use nonlinear regression to estimate the knot or an inflection point of a nonlinear function. In both approaches the cyclic nature of body …
Using Landscape Characteristics As Prior Information For Bayesian Classification Of Remotely Sensed Imagery, William J. Price, Bahman Shafii
Using Landscape Characteristics As Prior Information For Bayesian Classification Of Remotely Sensed Imagery, William J. Price, Bahman Shafii
Conference on Applied Statistics in Agriculture
Yellow starthistle is a dominant weed of north-central Idaho canyon grasslands. The distribution of yellow starthistle can be affected by general landscape characteristics, such as land use, as well as specific terrain related features such as elevation, slope, and aspect. Slope and aspect can be considered as indicators of plant community composition and distribution. Hence, these variables may be incorporated into prediction models to estimate the likelihood of yellow starthistle occurrence. An empirically derived nonlinear model based on landscape characteristics was developed to predict the likelihood of yellow starthistle occurrence in north central Idaho (Shafii, et al. 1999). While the …
Estimating The Contribution Of Specific Wheat Varieties To State-Level Production, Bingxin Yu, Richard K. Perrin, David B. Marx
Estimating The Contribution Of Specific Wheat Varieties To State-Level Production, Bingxin Yu, Richard K. Perrin, David B. Marx
Conference on Applied Statistics in Agriculture
This paper addresses measurement issues involved in estimating the benefits from a university wheat breeding program. The conceptual foundation is to estimate the spatial distribution of farm-level yields for varieties in each year, based on Nebraska winter wheat variety test data from 1972 to 2001, with 9-20 locations per year. We can then estimate the state average yield difference that would occur between the portfolios of varieties that farmers actually grew, and the portfolio of varieties excluding those varieties from the university breeding program. This paper reports estimates of the statewide annual yields of individual varieties using a standard fixed …
Impact Of Data Transformation On The Performance Of Different Clustering Methods And Cluster Number Determination Statistics For Analyzing Gene Expression Profile Data, Guoping Shu, Beiyan Zeng, Deanne Wright, Oscar Smith
Impact Of Data Transformation On The Performance Of Different Clustering Methods And Cluster Number Determination Statistics For Analyzing Gene Expression Profile Data, Guoping Shu, Beiyan Zeng, Deanne Wright, Oscar Smith
Conference on Applied Statistics in Agriculture
We have assessed the impact of 13 different data transformation methods on the performance of four types of clustering methods (partitioning (K-mean), hierarchical distance (Average Linkage), multivariate normal mixture, and non-parametric kernel density) and four cluster number determination statistics (CNDS) (Pseudo F, Pseudo t2, Cubic Clustering Criterion (CCC), and Bayesian Information Criterion (BIC), using both simulated and real gene expression profile data. We found that Square Root, Cubic Root, and Spacing transformations have mostly positive impacts on the performance of the four types of clustering methods whereas Tukey's Bisquare and Interquantile Range have mostly negative impacts. The impacts …
Unreplicated Spatial Designs Compared Using Optimality Criteria, Tisha Maas, David Marx, Dr. Jeff Pedersen
Unreplicated Spatial Designs Compared Using Optimality Criteria, Tisha Maas, David Marx, Dr. Jeff Pedersen
Conference on Applied Statistics in Agriculture
In field trials including large numbers of varieties, it is often impossible or impractical to replicate each variety. In these situations, the researcher may choose to use only one replicate of each test variety and to include a "check" variety every so often so that the spatial variability of the field may be determined. Five different check patterns were purposefully designed, each possessing distinct characteristics. The purpose of this study is to determine which spatial patterns for the check variety are better able to identify the spatial structure in a field and to rank the experimental varieties accurately. The problem …
Row-Colunin Designs At Pioneer Hi-Bred, Kevin Wright
Row-Colunin Designs At Pioneer Hi-Bred, Kevin Wright
Conference on Applied Statistics in Agriculture
Pioneer Hi-Bred annually tests more than one hundred thousand new varieties of corn hybrids. Experimental designs used for these tests include CRD, RCB, nested and split-plot. A Six Sigma project at Pioneer recommended testing the use of incomplete-block (IB) designs. In 2001 some experiments were structured as row-column IE designs. This talk will discuss the experience of implementing and analyzing the row-column designs, summaries of the results, and plans for future experiments.
The Information-Theoretic Approach To Model Selection: Description And Case Study, Erin E. Blankenshipa, Micah W. Perkinsb, Ron J. Johnsonc
The Information-Theoretic Approach To Model Selection: Description And Case Study, Erin E. Blankenshipa, Micah W. Perkinsb, Ron J. Johnsonc
Conference on Applied Statistics in Agriculture
In the wildlife literature there has been some recent criticism of statistical significance testing. In the past few years, both the Journal of ·Wildlife Management and the Wildlife Society Bulletin have published articles criticizing the overuse and misuse of hypothesis tests. One alternative to using hypothesis tests for model selection is the information-theoretic approach, proposed by Burnham and Anderson (1998). This technique uses values such as the Akaike Information Criterion and others to choose a set of plausible models from a set of a prioTi candidate models. Inferences are based on the set of plausible models, rather than on a …
Estimating Intraclass Correlation: Optimal Results Using Limited Resources, Brent D. Burch, Ian R. Harris
Estimating Intraclass Correlation: Optimal Results Using Limited Resources, Brent D. Burch, Ian R. Harris
Conference on Applied Statistics in Agriculture
From plant and animal breeding studies to industrial applications, the intraclass correlation coefficient (p) is used to measure the proportion of the total variation in the responses that may be attributed to a particular source. Confidence intervals for p are used to determine the optimal allocation of experimental material in one-way random effects models. Assuming the sample size is fixed, the authors investigate the number of groups and the number of observations per group required to minimize the expected length of confidence intervals. Examples are used to illustrate the selection of the best design. Both asymptotic and exact results suggest …
Impact Of Variance Component Estimates On Fixed Effect Inference In Unbalanced Linear Mixed Models, Walt Stroup, Ramon Littell
Impact Of Variance Component Estimates On Fixed Effect Inference In Unbalanced Linear Mixed Models, Walt Stroup, Ramon Littell
Conference on Applied Statistics in Agriculture
Inference on fixed effects in mixed models depends on standard errors or test statistics which in turn depend on estimates of variance and covariance components. For unbalanced mixed models, even relatively simple models such as two-way cross-classification models with interaction where one factor is fixed and the other is random, dilemmas arise that have received inadequate attention to date. For example, if one uses SAS PROC MIXED, one can estimate variance components using expected means squares from Type I, II, or III sums of squares, or one can use likelihood-based algorithms such as the default restricted maximum likelihood. If there …
Model Selection Techniques For Repeated Measures Covariance Structures, E. Barry Moser, Raul E. Macchiavelli
Model Selection Techniques For Repeated Measures Covariance Structures, E. Barry Moser, Raul E. Macchiavelli
Conference on Applied Statistics in Agriculture
A parsimonious covariance structure of repeated measures is often sought for purposes of increased power for testing hypotheses about the means, and for insight into the stochastic processes governing the repeated measures. For normal data, model selection is often based upon likelihood ratio tests or information criteria derived from the likelihood, sometimes supplemented with graphical plots of correlations and partial correlations. We exploit the ordered nature of repeated measures to decompose the likelihood ratio goodness-of-fit test statistic, and display graphical fingerprints associated with the covariance structures to help detect covariance structure misspecification, in order to provide guidance in choosing an …
The Completely Sufficient Statistician (Css), Ralph G. O'Brien
The Completely Sufficient Statistician (Css), Ralph G. O'Brien
Conference on Applied Statistics in Agriculture
Today's ideal statistical scientist develops and maintains a broad range of technical skills and personal qualities in four domains: (1) numeracy, in mathematics and numerical computing; (2) articulacy and people skills; (3) literacy, in technical writing and in programm,ing; and (4) graphicacy. Yet, many of these components are given short shrift in university statistics programs. Can even the best statistician today really be "completely sufficient?"
Editor's Preface And Table Of Contents, George A. Milliken
Editor's Preface And Table Of Contents, George A. Milliken
Conference on Applied Statistics in Agriculture
These proceedings contain papers presented in the fourteenth annual Kansas State University Conference on Applied Statistics in Agriculture, held in Manhattan, Kansas, April 28-30, 2002.
Modeling Vegetative Filter Performance With Vfsmod, Matthew J. Helmers, Dean E. Eisenhauer, Michael G. Dosskey, Thomas G. Franti
Modeling Vegetative Filter Performance With Vfsmod, Matthew J. Helmers, Dean E. Eisenhauer, Michael G. Dosskey, Thomas G. Franti
Matthew J. Helmers
The model VFSMOD was used to investigate the effect of varying watershed characteristics and buffer dimensions on the sediment trapping efficiency of vegetative filters. This investigation allows for a better understanding of how watershed characteristics, buffer dimensions, and storm characteristics impact the performance of vegetative filters. Using VFSMOD, relationships that estimate sediment trapping efficiency from the ratio of filter area and field area were developed for different sites. These relationships have been applied for field assessment of concentrated flow.
Environmental Impacts And Production Effects Of Subsurface Drainage At An Intensive Apple Orchard Near Donnybrook, Wa, D L. Bennett, Richard J. George Dr
Environmental Impacts And Production Effects Of Subsurface Drainage At An Intensive Apple Orchard Near Donnybrook, Wa, D L. Bennett, Richard J. George Dr
Resource management technical reports
This report documents results of research carried out within the Donnybrook area, Western Australia, to determine appropriate management for shallow groundwater system responsible for waterlogging of horticultural crops. On one irrigated and previously waterlogged orchard block an assessment is made of the role that subsurface water control had on fruit production and soil water conditions. The report focuses on environmental aspects.
Improved Soil Management And Cropping Systems For Waterlog-Prone Soils : Results Of The 2000 Season, Derk Bakker, Greg Hamilton, David Houlbrooke, Cliff Spann
Improved Soil Management And Cropping Systems For Waterlog-Prone Soils : Results Of The 2000 Season, Derk Bakker, Greg Hamilton, David Houlbrooke, Cliff Spann
Resource management technical reports
The results of the fourth year of a five year research and development project to develop soil management practices and cropping systems to prevent waterlogging and increase the productivity of waterlogged lands in Western Australia. The concept of raised beds was used to alleviate or prevent waterlogging.