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- Western Australia (3)
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Articles 1 - 29 of 29
Full-Text Articles in Physical Sciences and Mathematics
The Response Of Five Tropical Plant Species To Natural Solar Ultraviolet-B Radiation, Peter S. Searles
The Response Of Five Tropical Plant Species To Natural Solar Ultraviolet-B Radiation, Peter S. Searles
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Tropical regions currently receive the highest global levels of solar ultraviolet-B radiation (UV-B, 280-320 nm) even without ozone depletion. Thus, the influence of natural, present-day UV-B irradiance in the tropics was examined for five tropical species, including three native rainforest tree species and two economically important species. Solar UV-B radiation conditions were obtained vi using either a UV-B excluding plastic film or a near-ambient UV-B transmitting film in a small clearing on Barro Colorado Island (BCI), Panama (9 ° N). Significant differences were often exhibited as increased foliar UV-B absorbing compounds, increased leaf mass per area, and reduced leaf blade …
Dungpat Microenvironmental Effects On Germination And Establishment Of Crested Wheatgrass, Ghulam Akbar
Dungpat Microenvironmental Effects On Germination And Establishment Of Crested Wheatgrass, Ghulam Akbar
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Complementary greenhouse and field studies investigated the effects of ambient environmental conditions on cattle dungpat moisture, temperature, nutrient concentration, and crust formation dynamics, which in turn influence seed germination and seedling establishment in dungpats. 'Hycrest' crested wheatgrass [Agropyron desertorum (Fisch. ex Link) X A. cristatum (L.) Gaert.] was used as a representative revegetation species.
After collecting feces from Holstein steers that had been fed crested wheatgrass seeds, uniform dungpats were prepared and placed on two soil types (loam and coarse sand) in containers under three watering treatments (field capacity, 1/2 field capacity, and no water) in the greenhouse. Dungpat …
Prediction Of Breeding Values For Unmeasured Traits From Measured Traits, Kristin L. Barkhouse, L. Dale Van Vleck
Prediction Of Breeding Values For Unmeasured Traits From Measured Traits, Kristin L. Barkhouse, L. Dale Van Vleck
Conference on Applied Statistics in Agriculture
Henderson (1977, 1984) described a method for prediction of breeding values for traits not in the model for records. This method may be practical for animal or sire models for the case when no measurements can be obtained on any animals for some traits to be evaluated. The least squares equations are augmented with A-1⊗GN-1 rather than with A-1⊗G0-1 where A is the numerator relationship and G0and GN are the genetic covariance matrices for measured and for all traits. This method can be used for each unmeasured trait or …
Applications Of Estimable Functions In Agricultural Research With Special Emphasis On The Glm Procedure Of Sas., L. Munyakazi, R. L. Hintz, B. D. Selby
Applications Of Estimable Functions In Agricultural Research With Special Emphasis On The Glm Procedure Of Sas., L. Munyakazi, R. L. Hintz, B. D. Selby
Conference on Applied Statistics in Agriculture
An understanding of estimable functions is essential when using an overparameterized linear model. The most attractive features of these functions are their invariance property to the solution vector and their wide range of practical applications in agricultural research. This study reviews some of the ways that estimable functions can be used by the agricultural scientist.
Extrapolating Intra-Cluster Correlation To Optimize The Size Of Segments In An Area Frame., E. Carfagna, F. J. Gallego
Extrapolating Intra-Cluster Correlation To Optimize The Size Of Segments In An Area Frame., E. Carfagna, F. J. Gallego
Conference on Applied Statistics in Agriculture
In the frame of the "Rapid Crop Area Estimates in the European Community" we use a sample of squared segments (pieces of land) of 49 ha. each; estimates are made for difference of crop areas between years. The optimum size seems to be larger than the current one, and much larger if ground survey data are obtained by photo-interpretation. The main purpose of this paper is to assess a method, based on splitting the segments into pieces of 1/4 ha., to forecast the precision of estimates with larger segments. The tests made for France confirm the belief that better estimates …
Modelling Within-Plant Spatial Dependencies Of Cotton Yield, E. B. Moser, R. E. Macchiavelli, D. J. Boquet
Modelling Within-Plant Spatial Dependencies Of Cotton Yield, E. B. Moser, R. E. Macchiavelli, D. J. Boquet
Conference on Applied Statistics in Agriculture
In field experiments during 1987-1990, cotton plants were grown under 8 different levels of nitrogen application to assess the impact of nitrogen fertilization on the fruiting and yield distribution of cotton within the plant (Boquet et al. 1993).lr.dividual boll weights and average seedcotton yield were determined at each fruiting site fur each main-stem node along the plant. Various models of dependence and independence are possible to explain and account for the dependencies of the yields among the sites and nodes of the plant. Here we investigate models of total yield per node and yield per node adjusted for the number …
Fitting Bole-Volume Equations To Spatially Correlated Within-Tree Data, Timothy G. Gregoire, Oliver Schabenberger
Fitting Bole-Volume Equations To Spatially Correlated Within-Tree Data, Timothy G. Gregoire, Oliver Schabenberger
Conference on Applied Statistics in Agriculture
Equations to predict the volume of an individual tree bole between stump height and the height at which its diameter has tapered to a specified minimum are common in forestry. When fitting such a regression equation, a sample of trees which span the range of sizes needed for eventual application of the equation is selected. Bole diameter is measured at ascending heights on the bole. Each tree, therefore, contributes multiple measurements to the data fitted to the equation. In contrast to past practice, we model these data in a manner which accounts for the likely spatial correlation among measurements within …
A Bootstrap Analysis Of Temperature Effects On Bean Leaf Beetle Egg Hatch Times, Kenneth J. Koehler
A Bootstrap Analysis Of Temperature Effects On Bean Leaf Beetle Egg Hatch Times, Kenneth J. Koehler
Conference on Applied Statistics in Agriculture
The bean leaf beetle (Cerotoma trifurcata) is a significant soybean pest in the Midwest. The possibility of reducing crop damage by disrupting the synchrony between emergence of F2 adults and the availability of young green pods requires an increased understanding of bean leaf beetle (BLB) phenology. An important consideration in predicting emergence of F2 adults is the influence of temperature on the rates of egg and larval development. In this article we concentrate on the analysis of data from a controlled study of the effects of temperature on both the hatch time distribution and the viability of BLB …
Nonlinear Regression Functions For Forage Nutrient Disappearance From Bags Incubated In The Rumen, W. J. E. Potts, B. P. Glenn, J. B. Reeves, R. A. Erdman
Nonlinear Regression Functions For Forage Nutrient Disappearance From Bags Incubated In The Rumen, W. J. E. Potts, B. P. Glenn, J. B. Reeves, R. A. Erdman
Conference on Applied Statistics in Agriculture
Seven nonlinear regression functions are compared for fitting rumen in situ disappearance data. The standard function is based on a simple one-compartment model. In addition, we consider a time lag modification, a two-compartment model, and functions based on underlying probability models for degradation time. The empirical suitability of the seven regression functions are assessed using two in situ experiments involving forages fed to dairy cows. A function based on the loglogistic distribution is shown to have empirical and theoretical advantages.
Obtaining Models For Alfalfa, Sorghum, And Wheat Residue Decomposition, H. H. Schomberg, T. W. Popham
Obtaining Models For Alfalfa, Sorghum, And Wheat Residue Decomposition, H. H. Schomberg, T. W. Popham
Conference on Applied Statistics in Agriculture
Crop residues provide an economical means for controlling wind and water erosion in addition to being a valuable source of plant nutrients. As residues decompose they lose nutrients, mass and the ability to protect the soil surface from erosive forces. The research was designed to evaluate rates of residue decomposition of sorghum, wheat and alfalfa on the soil surface and buried, in five soil moisture regimes. Moisture was applied to soil by line source irrigation and bags containing crop residues were retrieved and analyzed across time. Thus, observations were repeated in both space and time .
Wieder and Lang (1982) …
Determination Of The Inoculation Frequency, Timing Of Inoculation And Dose Of A Bacterial Ruminal Inoculant For Acidosis Prevention In Feedlot Cattle, J. F. Boucher, W. J. Smolenski, J. A. Robinson
Determination Of The Inoculation Frequency, Timing Of Inoculation And Dose Of A Bacterial Ruminal Inoculant For Acidosis Prevention In Feedlot Cattle, J. F. Boucher, W. J. Smolenski, J. A. Robinson
Conference on Applied Statistics in Agriculture
We are evaluating the efficacy of a ruminal bacterial inoculant (Megasphaera elsdenii 407 A) for prevention of acute acidosis in grain-fed cattle. As a part of this process, we examined the effects of inoculation frequency, timing of inoculation and dose of 407 A for prevention of acute acidosis in ruminally fistulated cattle. Three levels of frequency, two levels of timing and three doses were considered, however, a complete 3x2x3 factorial study was not run because of resource constraints. The study was conducted in two separate trials. The first was designed as a 3x2 factorial experiment with inoculation frequency and timing …
Design For The Experimenter, O. B. Allen, D. A.J. Ryan
Design For The Experimenter, O. B. Allen, D. A.J. Ryan
Conference on Applied Statistics in Agriculture
Three research problems, for which there was no obvious textbook design available, are presented. Each of the three involve constructing incomplete block designs for factorial treatment arrangements. While the designs are not likely optimal by any of the classical criteria, they meet the objectives of the research projects. The constructions involved confounding, with incomplete blocks, those effects which were of least interest. However, effects of interest were also allowed to be slightly non-orthogonal to blocks in order to be able to examine a larger number of effects of interest.
Experimental Error In Agronomic Field Trials, Thomas M. Loughin, D. F. Cox, Paul N. Hinz, William T. Schapaugh Jr., Lora Kilgore-Norquest
Experimental Error In Agronomic Field Trials, Thomas M. Loughin, D. F. Cox, Paul N. Hinz, William T. Schapaugh Jr., Lora Kilgore-Norquest
Conference on Applied Statistics in Agriculture
Agronomic experiments often summarize work carried out in trials run in several locations over several years, referred to generically as environments. The appropriate statistical analyses for these experiments depend on definitions used for experimental error. The results of one such experiment, in which identical designs were used in each environment, illustrate the commonalities and differences in analyses that can result from using different definitions of experimental error.
Markov-Recapture Population Estimates, E. Paul Wileyto
Markov-Recapture Population Estimates, E. Paul Wileyto
Conference on Applied Statistics in Agriculture
This paper reviews recent development of a method for estimating insect populations. It is like mark-recapture methods, except that marking is done passively at bait stations by the insects themselves, and capture probabilities are generated using a simple Markov process model. Assumptions about rates of marking and capture are made from the sampling scheme, and the estimate is based upon the resulting multinomial probability distribution and maximum likelihood methods. The paper continues to review the sampling distributions for the population estimate, revealed by simulation, and explores correction of the bias. Relative likelihood based confidence intervals are compared with two standard …
Predicting Common Crupina Habitat With Geographic And Remote Sensing Data, Timothy S. Prather, Bahman Shafii, Robert H. Callihan
Predicting Common Crupina Habitat With Geographic And Remote Sensing Data, Timothy S. Prather, Bahman Shafii, Robert H. Callihan
Conference on Applied Statistics in Agriculture
Field surveys for common crupina, as part of an eradication program, are time intensive and could be made more efficient if common crupina habitat could be predicted. Slope, aspect, and vegetation data were used as generalized plant community variables to predict common crupina habitat using a transformed logistic regression. Models were constructed using either aspect or slope as an explanatory variable such that one model predicted the overall effect of either slope or aspect and a set of models predicted the effect of slope or aspect at each of three vegetation classes. A second data set was used to validate …
Stratification And Cluster Estimator On An Area Frame By Squared Segments With An Aligned Sample, M. Fuentes, F J. Gallego
Stratification And Cluster Estimator On An Area Frame By Squared Segments With An Aligned Sample, M. Fuentes, F J. Gallego
Conference on Applied Statistics in Agriculture
Several European countries (Portugal, Spain, Greece, Rumania, and the Czech Republic) make crop surveys on area frame with an aligned systematic sampling of squared segments. So far crop area estimates are obtained with standard formulae for random sampling, without using the spatial structure of the sample. This is in general conservative, the estimated standard error is larger than the error actually made. Taking as clusters the set of segments with the same relative position in a block, gives often lower but very unstable variances. A more stable variance estimate is computed by repeated random permutations of the sample segments in …
Generalized Linear Mixed Models: An Application, Stephen D. Kachman, Walter W. Stroup
Generalized Linear Mixed Models: An Application, Stephen D. Kachman, Walter W. Stroup
Conference on Applied Statistics in Agriculture
The purpose of this paper is to present a specific application of the generalized linear mixed model. Often of interest to animal-breeders is the estimation of genetic parameters associated with certain traits. When the trait is measured in terms of a normally distributed response variable, standard variance-component estimation and mixed-model procedures can be used. Increasingly, breeders are interested in categorical traits (degree of calving difficulty, number born, etc.). An application of the generalized linear mixed to an animal breeding study of the number of lambs born alive will be presented. We will show how the model is determined, how the …
Generalized Linear Mixed Models - An Overview, W. W. Stroup, S. D. Kachman
Generalized Linear Mixed Models - An Overview, W. W. Stroup, S. D. Kachman
Conference on Applied Statistics in Agriculture
Generalized linear models provide a methodology for doing regression and ANOV A-type analysis with data whose errors are not necessarily normally-distributed. Common applications in agriculture include categorical data, survival analysis, bioassay, etc. Most of the literature and most of the available computing software for generalized linear models applies to cases in which all model effects are fixed. However, many agricultural research applications lead to mixed or random effects models: split-plot experiments, animal- and plant-breeding studies, multi-location studies, etc. Recently, through a variety of efforts in a number of contexts, a general framework for generalized linear models with random effects, the …
Autologistic Model Of Spatial Pattern Of Phytophthora Epidemic In Bell Pepper: Effects Of Soil Variables On Disease Presence, M. L. Gumpertz, J. Graham, J. B. Ristaino
Autologistic Model Of Spatial Pattern Of Phytophthora Epidemic In Bell Pepper: Effects Of Soil Variables On Disease Presence, M. L. Gumpertz, J. Graham, J. B. Ristaino
Conference on Applied Statistics in Agriculture
The pathogen Phytophthora capsici causes lesions on the crown, stem, and leaves of bell pepper, and rapidly causes the plant to die. The spatial patterns of disease in an agricultural field contain information about pathogen dispersal mechanisms and can be useful for developing methods of control of disease. Soil water content, soil pathogen population density, and disease incidence data were collected on a 20 x 20 grid in two naturally infested commercial bell pepper fields. In one field the initial pattern of disease closely matched the soil water content pattern and disease developed in areas where the pathogen population levels …
Determining Sample Size To Bound The Probability Of Classifying A Sample Into The Wrong One Of Two Multinomially Distributed Populations, C. Philip Cox
Conference on Applied Statistics in Agriculture
The problem considered is that of choosing between the two specifications . . . of known multinomial probabilities on the basis of sample values x j, the observed counts in the j = 1,... ,k, classes, with . . . The particular question examined is 'how large should N be to achieve reliable differentiation?'. It is shown how to find N such that the probability of misc1assification does not exceed a prescribable value. The method is exemplified in a genetic context.
Vertical Integration In The Chicken Broiler Industry, Juana Sanchez
Vertical Integration In The Chicken Broiler Industry, Juana Sanchez
Conference on Applied Statistics in Agriculture
This paper analyzes three hypotheses concerning supply in the U.S. chicken broiler industry: (a) there has been a cycle in the industry of approximately 27-36 months length; (b) the seasonal and other periodic components, as well as relations between variables, have changed as a result of vertical integration in the industry; (c) the effects of vertical integration in the industry were counteracted in the early seventies by such forces external to the industry as domestic and international economic conditions .
The hypotheses are analyzed using new monthly, non-seasonally adjusted time series data for chick placement, wholesale broiler prices, chicks hatched …
A Study Of The Statistical Properties Of Two Measures Of Competition, Ann L. Oberg, Linda J. Young, Leon G. Higley
A Study Of The Statistical Properties Of Two Measures Of Competition, Ann L. Oberg, Linda J. Young, Leon G. Higley
Conference on Applied Statistics in Agriculture
In competition studies, two species are studied, generally in ratios of 1:0, 3:1, 1:1, 1:3,and 0: 1. The standard measure of competition is the Relative Crowding Coefficient (RCC)...
An Individual-Plant Growth Simulation Model For Quantifying Plant Competition, William J. Price, Bahman Shafii, Donald C. Thill
An Individual-Plant Growth Simulation Model For Quantifying Plant Competition, William J. Price, Bahman Shafii, Donald C. Thill
Conference on Applied Statistics in Agriculture
Plant competition models traditionally have used population or stand level parameters as a basis for modeling. While such models may be valid with regard to average responses, they fail to account for important factors such as within stand variability and spatial relationships. This translates to an assumption of uniformity in growth characteristics among individual plant,S as well as an equidistant spacing arrangement which are unlikely in real populations. One alternative is to model the growth characteristics of individual plants separately which, when combined as a system, will inherently have popUlation attributes related to competition. Competition models of this type allow …
Editor's Preface, Table Of Contents, And List Of Attendees, James R. Schwenke
Editor's Preface, Table Of Contents, And List Of Attendees, James R. Schwenke
Conference on Applied Statistics in Agriculture
These proceedings contain papers presented in the sixth annual Kansas State University Conference on Applied Statistics in Agriculture, held in Manhattan, Kansas, April 24 through 26, 1994..
An Inventory And Condition Survey Of The Murchison River Catchment, Western Australia, Peter James Curry, A L. Payne, K A. Leighton, P Hennig, D A. Blood
An Inventory And Condition Survey Of The Murchison River Catchment, Western Australia, Peter James Curry, A L. Payne, K A. Leighton, P Hennig, D A. Blood
Technical Bulletins
The inventory and condition survey of the Murchison River catchment and surrounds, undertaken by the Department of Agriculture between 1985 and 1988, describes and maps the natural resources of the region’s pastoral leasehold land. This survey report provides a baseline record of the existence and condition of the natural area’s resources, to assist with the planning and implementation of land management practices. The report identified and described the condition of soils, landforms, vegetation, habitat, ecosystems, and declared plants and animals. It also assessed the impact of pastoralism and made land management recommendations. The area surveyed by field work during 1985-88 …
Extension And Education Materials For Sustainable Agriculture, Volume 2, James W. King, Charles A. Francis
Extension And Education Materials For Sustainable Agriculture, Volume 2, James W. King, Charles A. Francis
CARI Extension and Education Materials for Sustainable Agriculture
Extension and Education Materials for Sustainable Agriculture
Curricula in Sustainable Agriculture
Introduction to Curricula in Sustainable Agriculture
Sustainable Agriculture, Agronomy 493/593 Course Outline
Sustainable Agriculture, Agronomy 493/AG*SAT
Principles and Practices of Sustainable Agriculture
Agricultural Ecosystems
Agricultural Ecology
Agroecology
Agricultural Ecology and Sustainability
Alternative Agriculture Curriculum
Sustainable Agriculture (B.S.)
Environment and World Food Production
Issues (Advanced) in Sustainable Agriculture
Crops, Soil, and Civilization, Agronomy 440
Master of Science in Sustainable Systems
Agricultural Ecology
National Curriculum for Sustainable Agriculture
Reshaping Undergraduate and Graduate Education to Include a Whole Systems Emphasis
Sustainable Agriculture Education: A Panel
Impact of Sustainable Agriculture Programs on United.States …
Extension And Education Materials For Sustainable Agriculture, Volume 1, Charles A. Francis, Jim King
Extension And Education Materials For Sustainable Agriculture, Volume 1, Charles A. Francis, Jim King
CARI Extension and Education Materials for Sustainable Agriculture
Extension and Education Materials for Sustainable Agriculture
Future Harvest Teaching Manual
A Teacher's Guide to Cropping System Design
A Guide to Nitrogen Optimization
Preventative Weed Management
Integrated Soil Fertility Management
The Economics of Sustainable Agriculture
A Guide for Lease Structures and Landlord-Tenant Agreements for Converting to More Sustainable Agriculture
The Green Revolution Simulation
The Use of Decision Cases in Agricultural Education and Research
Teaching with Cases
Sustainable Systems for the Future: The Nebraska Program
Integration of Environmental and Sustainable Development in Extension: Case Study from Nebraska, USA
Agricultural Producers and Environmentalists: What are Common Goals?
Designing the Future Farmscape
Sustainable …
An Inventory And Condition Survey Of Rangelands In The North-Eastern Goldfields, Western Australia, H J. Pringle, S A. Gilligan, A M E Van Vreeswyk
An Inventory And Condition Survey Of Rangelands In The North-Eastern Goldfields, Western Australia, H J. Pringle, S A. Gilligan, A M E Van Vreeswyk
Technical Bulletins
The inventory and condition survey of the north-eastern Goldfields, undertaken by the Department of Agriculture and Food, Western Australia (DAFWA) between 1988 and 1990, describes and maps the natural resources of the region’s pastoral leasehold land. This survey report provides a baseline record of the existence and condition of the natural area’s resources, to assist with the planning and implementation of land management practices. The report identified and described the condition of soils, landforms, vegetation, habitat, ecosystems, and declared plants and animals. It also assessed the impact of pastoralism and made land management recommendations. The area surveyed covers about 100 …
Land Resources Of The Northam Region, Neil Clifton Lantzke, I Fulton
Land Resources Of The Northam Region, Neil Clifton Lantzke, I Fulton
Land resources series
This report presents soil and landform mapping of about one million hectares in the Avon Valley and central wheatbelt of Western Australia at scale of 1:100,000. The study area spans from the lateritic plateau of the Darling Range to the broad, flat landscape of the wheatbelt and covers four broad physiographic regions: • the Zone of Ancient Drainage; • the Zone of Rejuvenated Drainage; • the West Kokeby Zone; and • the Darling Range Zone. Twenty-five soil landscape units were identified and mapped on the accompanying map sheets. A soil landscape unit is an area of land that occurs in …