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Articles 5041 - 5070 of 7341

Full-Text Articles in Physical Sciences and Mathematics

Soil Nitrogen Dynamics Following Harvesting And Conversion Of Red Alder And Douglas-Fir Stands, H. Van Miegroet, P. S. Homann, D. W. Cole Jan 1992

Soil Nitrogen Dynamics Following Harvesting And Conversion Of Red Alder And Douglas-Fir Stands, H. Van Miegroet, P. S. Homann, D. W. Cole

Watershed Sciences Faculty Publications

Drastic reductions in NO3- leaching have been observed after harvesting of mature red alder (Alnus rubra Bong.) stands. Our objective was to examine whether these reduction were linked to changes in soil N dynamics. Adjacent alder and Douglas fir [Pseudotsuga menziessii (Mirbel.) Franco] stands on young glacial soils (Alderwood; a loamy-skeletal, mixed, mesic, ortstein Aquic Haplorthod) in western Washington were harvested and replanted with either alder or Douglas fir seedlings; reference plots were established in nearby undisturbed stands. Three years after site conversion, when NO3- leaching declined most drastically in the harvested alder plots, net N mineralization and net nitrification …

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Soil Chemistry And Nutrition Of North American Red Spruce-Fir Stands: Evidence For Recent Change, J. D. Joslin, J. M. Kelly, H. Van Miegroet Jan 1992

Soil Chemistry And Nutrition Of North American Red Spruce-Fir Stands: Evidence For Recent Change, J. D. Joslin, J. M. Kelly, H. Van Miegroet

Watershed Sciences Faculty Publications

One set of hypotheses offered to explain the decline of red spruce (Picea rubens Sarg.) in eastern North America focuses on the effect of acidic deposition on soil chemistry changes that may affect nutrient availability and root function. Long-term soils data suggest that soil acidification has occurred in some spruce stands over the past 50 yr, with plant uptake and cation leaching both contributing to the loss of cations. Studies of tree ring chemistry also have indicated changes in Ca/Al and Mg/Al ratios in red spruce wood, suggesting increases in the ionic strength of soil solution. Irrigation studies using strong …

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Fragmentation Of Percolation Clusters At The Percolation Threshold, M. F. Gyure, Boyd F. Edwards Jan 1992

Fragmentation Of Percolation Clusters At The Percolation Threshold, M. F. Gyure, Boyd F. Edwards

All Physics Faculty Publications

A scaling theory and simulation results are presented for fragmentation of percolation clusters by random bond dilution. At the percolation threshold, scaling forms describe the average number of fragmenting bonds and the distribution of cluster masses produced by fragmentation. A relationship between the scaling exponents and standard percolation exponents is verified in one dimension, on the Bethe lattice, and for Monte Carlo simulations on a square lattice. These results further describe the structure of percolation clusters and provide kernels relevant to rate equations for fragmentation.

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Su(3) X Su(2) X U(1)Su(3): The Residual Symmetry Of Conformal Gravity, James Thomas Wheeler Jan 1992

Su(3) X Su(2) X U(1)Su(3): The Residual Symmetry Of Conformal Gravity, James Thomas Wheeler

All Physics Faculty Publications

SUe 4) x SU(2) is shown to characterize the possible choices of spacetime metric constructible from the gauge fields of the conformal group. When this symmetry is broken by the choice of metric, exactly the SU(3) x SU(2) x U(l) symmetry of the standard model remains. The conformal group consists of Lorentz transformations, translations, inverse translations and dilations. Treated in the standard way, conformal symmetry fails as a unifying gauge group: dilations make the mass spectrum continuous, and the inverse translational gauge field is auxiliary. The theory reduces back to the Poincare group.

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Analysis Of Experiments In Helium Microbeam Mixing, J B. Davis, R E. Benenson, David Peak Jan 1992

Analysis Of Experiments In Helium Microbeam Mixing, J B. Davis, R E. Benenson, David Peak

All Physics Faculty Publications

We have continued to investigate ion-beam mixing in bilay-er targets irradiated by 2-MeV He+ microbeams at room temperature. Although we have previously reported a linear dependence of interface width on dose for Cu/Al targets 1, more extensive results have not supported this conclusion, within statistical uncertainty, it appears that the interface width in Cu/Al (1) is proportional to the square root of dose, at constant dose rate, (2) is larger in Al than in Cu, for the same dose, (3) is proportional to the 1/4 power of dose rate, and (4) is absent at liquid nitrogen temperature. Calculations …

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Ionospheric Simulation Compared With Dynamics Explorer Observations For November 22, 1981, Jan Josef Sojka, M. D. Bowline, Robert W. Schunk, J. D. Craven, L. A. Frank, J. R. Sharber, J. D. Winningham, L. H. Brace Jan 1992

Ionospheric Simulation Compared With Dynamics Explorer Observations For November 22, 1981, Jan Josef Sojka, M. D. Bowline, Robert W. Schunk, J. D. Craven, L. A. Frank, J. R. Sharber, J. D. Winningham, L. H. Brace

All Physics Faculty Publications

Dynamics Explorer (DE) 2 electric field and particle data have been used to constrain the inputs of a time-dependent ionospheric model (TDIM) for a simulation of the ionosphere on November 22, 1981. The simulated densities have then been critically compared with the DE 2 electron density observations. This comparison uncovers a model-data disagreement in the morning sector trough, generally good agreement of the background density in the polar cap and evening sector trough, and a difficulty in modelling the observed polar F layer patches. From this comparison, the consequences of structure in the electric field and precipitation inputs can be …

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Solar Cycle Dependence Of Spacecraft Charging In Low Earth Orbit, T. B. Frooninckx, Jan Josef Sojka Jan 1992

Solar Cycle Dependence Of Spacecraft Charging In Low Earth Orbit, T. B. Frooninckx, Jan Josef Sojka

All Physics Faculty Publications

Recent experimental evidence has shown that Defense Meteorological Satellite Program (DMSP) polar orbiting spacecraft at 840 km can develop electric potentials as severe as −1430 V while at high magnetic latitudes. To explore this charging region, an analysis of DMSP F6, F7, F8, and F9 satellite precipitating particle and ambient plasma measurements taken during periods of high, medium, and low solar flux is performed. One hundred eighty-four charging events ranging from −46 to −1430 V are identified, and an extreme solar cycle dependence is found as charging is most frequent and severe during solar minimum. Satellite measurements and time-dependent ionospheric …

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Is General Relativity An "Already Parametrized" Theory?, Charles G. Torre Jan 1992

Is General Relativity An "Already Parametrized" Theory?, Charles G. Torre

All Physics Faculty Publications

Beginning with the work of Dirac and of Arnowitt, Deser, and Misner in the late 1950s and early 1960s, and then after subsequent development by Kuchař, the canonical dynamical structure of general relativity has often been viewed as that of a parametrized field theory in which the many-fingered spacetime variables are hidden among the geometrodynamical field variables. This paradigm of general relativity as an "already parametrized" theory forms the basis for one of the most satisfactory resolutions of the problems of time and observables in classical and quantum gravity. However, despite decades of effort, no identification of many-fingered spacetime variables …

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Covariant Phase Space Formulation Of Parametrized Field Theories, Charles G. Torre Jan 1992

Covariant Phase Space Formulation Of Parametrized Field Theories, Charles G. Torre

All Physics Faculty Publications

Parametrized field theories, which are generally covariant versions of ordinary field theories, are studied from the point of view of the covariant phase space: the space of solutions of the field equations equipped with a canonical (pre)symplectic structure. Motivated by issues arising in general relativity, we focus on phase space representations of the space‐time diffeomorphism group, construction of observables, and the relationship between the canonical and covariant phase spaces.

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Ultrahigh Vacuum Chamber For Synchrotron X-Ray Diffraction From Films Adsorbed On Single-Crystal Surfaces, Jr Dennison, S. K. Wang, S. N. Ehrlich Jan 1992

Ultrahigh Vacuum Chamber For Synchrotron X-Ray Diffraction From Films Adsorbed On Single-Crystal Surfaces, Jr Dennison, S. K. Wang, S. N. Ehrlich

Journal Articles

An ultrahigh vacuum chamber has been developed for structural analysis of adsorbed films and single-crystal surfaces using synchrotron x-ray diffraction. It is particularly well suited for investigations of physisorbed and other weakly bound films. The chamber is small enough to transport and mount directly on a standard four-axis diffractometer and can also be used independently of the x-ray diffractometer. A low-current, pulse-counting, low-energy electron diffraction/Auger spectroscopy system with a position-sensitive detector enables in situ characterization of the film and substrate while the sample is located at the x-ray scattering position. A closed-cycle He refrigerator and electron bombardment heater provide controlled …

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Composting Of Explosives Contaminated Soil Using The White Rot Fungus Phanerochaete Chrysosporium, Michael J. Mcfarland, Shashi Kalaskar, Eric Baiden Jan 1992

Composting Of Explosives Contaminated Soil Using The White Rot Fungus Phanerochaete Chrysosporium, Michael J. Mcfarland, Shashi Kalaskar, Eric Baiden

Reports

Bioaugmentation using the white rot fungus Phanerochaete chrysosporium was found to be effective in enhancing TNT removal in lightly (i.e., below 100 mg/kg) contaminated soil. The percent reduction in TNT increased from 15% to 53% when soils were treated with fungal inoculated organic material. Maximum removal rates improved from 0.33 mg TNT/kg-day to 0.76 mg TNT/kg-day during the same treatment. Neither fungal inoculation nor organic amendment addition resulted in improving TNT removal kinetics in highly contaminated soils (i.e., above 1000 mg/kg). Executive Summary: Laboratory scale compost studies were conducted to evaluate the effect of bioaugmentation with the white rot fungus,

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A Spatially Distributed Water Balance Based On Physical, Isotropic And Airborne Remotely Sensed Data, C. M.U. Neale, David G. Tarboton, J. J. Mcdonnell Jan 1992

A Spatially Distributed Water Balance Based On Physical, Isotropic And Airborne Remotely Sensed Data, C. M.U. Neale, David G. Tarboton, J. J. Mcdonnell

Reports

Introduction: The objective of this research to develop a spatially distributed water balance model based on the integration of spatially distributed data. Progress this year has consisted of model development, instrument acquisition, installation and development of experimental procedures, and baseline data collection. The original research plan called for detailed observations related to the water balance over the year September 1991 to August 1992. The detailed measurements were to start with accumulation of the snowpack followed by melt and evapotranspiration measurements from March to August. The objective was to measure the energy balance parameters starting with the peak accumulation, through the …

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Evaluation Of Mechanisms Of Alteration And Humification Of Pahs For Water Quality Management, Ronald C. Sims, Carolyn K. Abbott Jan 1992

Evaluation Of Mechanisms Of Alteration And Humification Of Pahs For Water Quality Management, Ronald C. Sims, Carolyn K. Abbott

Reports

Introduction: Creosote-pentachlorophenol (PCP) is a mixture commonly used as a wood preservative in the U.S. (1). A 1988 survey (2) indicated that 1,397 wood preserving waste contaminated sites exist in the United States consisting of 555 active wood treatment plants and 842 inactive plants. Stinson (3) indentifed 58 wood preserving sites on the National Priorities List, of which 51 have PCP and/or creosote or polycyclic aromatic hydrocarbon (PAH) contamination. Principal classes of organic constituents present in creosote waste are PAHs (~85% by weight) and phenolics. PAHs with less than three fused benzene rings comprise 69% (i.e., naphthalene, anthracene and phenanthrene); …

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Nonparametric Stratigraphic Interpretation From Drill Log Data, Upmanu Lall, A. I. Ali Jan 1992

Nonparametric Stratigraphic Interpretation From Drill Log Data, Upmanu Lall, A. I. Ali

Reports

Near surface groundwater contamination is a widespread problem. The potential for contamination of deep aquifers in such areas depends on the vertical hydraulic gradient as well as the extent and location of interconnection between the upper and lower aquifers. In alluvial, sedimentary environment, the geologic units are typically weakly connected lenses or layers of high or low conductivity with variable size, geometry and orientation. Drill logs provide qualitative, local information on such aquifer heterogeneities. A binary (high or low conductivity) indicator function is used to describe the aquifer system. A nonparametric statistical methodology for assessing the probability that a particular …

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A Partial Glossary Of Elk Management Terms, United States Department Of Agriculture, Forest Service Jan 1992

A Partial Glossary Of Elk Management Terms, United States Department Of Agriculture, Forest Service

Forestry

This glossary helps define terms that have been misused during forest planning. Terms that were developed from research on the influences of timber sales and roads during the summer months have been used inappropriately when referring to winter range, hunting seasons, and other conditions. The glossary is based on the results of an "Elk Management Terminology Workshop" held at the University of Montana's Lubrecht Experimental Forest on April 3-4, 1990.

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Effects Of Seeder Design And Seed Placement On Seedling Size And Cull Rates At Western Forest Nurseries, United States Department Of Agriculture, Forest Service Jan 1992

Effects Of Seeder Design And Seed Placement On Seedling Size And Cull Rates At Western Forest Nurseries, United States Department Of Agriculture, Forest Service

Forestry

Nursery plots sown with the Summit Precision Seeder and the Oyjord Seeder were compared with plots oversown and hand thinned to desired spacings. We studied 26 seedlots of nine conifer species at five Forest Service, U.S. Department of Agriculture, nurseries. Results varied with nursery, species, and seed characteristics. Thinned plots produced less clumping and fewer gaps between seedlings, but showed little or no difference in seedling size, nor in the number of acceptable seedlings.

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Plant Community Diversity After Herbicide Control Of Spotted Knapweed, United States Department Of Agriculture, Forest Service Jan 1992

Plant Community Diversity After Herbicide Control Of Spotted Knapweed, United States Department Of Agriculture, Forest Service

Herbicides and Pesticides

Herbicides were applied to four west-central Montana sites with light to moderate spotted knapweed (Centaurea maculosa Lam.) infestations. Althought knapweed suppression was high, 2 years after the spraying the communities were not converted to grass monocultures. No large declines in plant diversity were caused by the herbicides, and small depressions were probably transitory. By the third year, diversity had increased.

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Final Environmental Impact Statement Stanley Basin C & H Allotment Management Plan Sawtooth National Recreation Area, United States Forest Service Jan 1992

Final Environmental Impact Statement Stanley Basin C & H Allotment Management Plan Sawtooth National Recreation Area, United States Forest Service

Final Environmental Impact Statements (ID)

This Final Environmental Impact Statement (FEIS) documents the analysis conducted for the Stanley Basin Cattle and Horse Allotment Management Plan. The allotment management plan involves National Forest System lands within the Sawtooth and Challis National Forests. The analysis of the current condition of the Stanley Basin Allotment has found that the existing grazing system does not comply with the direction, standards and guidelines of the Sawtooth and Challis Forest Land and Resource Management Plans (FLRMP). The proposed action of this Final Environmental Impact Statement is to bring management of the allotment into compliance with the FLRMPs. The FEIS describes five …

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Final Environmental Impact Statement For Salt Lake City International Airport Expansion, Salt Lake City, Utah, United States Department Of Transportation Federal Aviation Administration Jan 1992

Final Environmental Impact Statement For Salt Lake City International Airport Expansion, Salt Lake City, Utah, United States Department Of Transportation Federal Aviation Administration

All U.S. Government Documents (Utah Regional Depository)

Expansion of the Salt Lake City International Airport is proposed to meet the existing and future travel demands of the public and air carriers using the airport. Specifically, it is proposed to increase the safety and efficiency of the airport by reducing congestion and delays. The expansion of the airport has been planned for over 12 years including 2 Master Planning efforts, a FAR Part 150 document (an airport noise compatability planning study), a Capacity Task Force Document, and the Draft Environmental Assessment and Expanded Environmental Assessment efforts in addition to numerous smaller studies and documents.

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Environmental Assessment, Carter Mountain-Thermopolis 230-Kv Transmission Line Project, Hot Springs County, Wyoming, U.S. Department Of Energy Jan 1992

Environmental Assessment, Carter Mountain-Thermopolis 230-Kv Transmission Line Project, Hot Springs County, Wyoming, U.S. Department Of Energy

Environmental Assessments (WY)

The Western Area Power Administration (Western) is proposing to construct, operate, and maintain a new 230-kV transmission line between the Carter Mountain and Thermopolis Substations in northcentral Wyoming (Hot Springs County). The project area is shown on Map 2-1. This environmental assessment was prepared in compliance with the National Environmental Policy Act (NEPA) and the regulations of the Council on Environmental Quality and the Department of Energy, which is responsible for approval of the proposed action. The Bureau of Land Management (BLM) is a cooperating agency on the project and is also the Federal review agency responsible for granting rights-of-way …

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Oil And Gas Leasing On The Thunder Basin National Grassland Final Environmental Impact Statement, United States Forest Service Jan 1992

Oil And Gas Leasing On The Thunder Basin National Grassland Final Environmental Impact Statement, United States Forest Service

Final Environmental Impact Statements (WY)

This Final Environmental Impact Statement was conducted to analyze what lands on the Medicine Bow National Forest, Thunder Basin National Grassland in northeast Wyoming could be available for leasing and what conditions could be attached to future leases. Seven alternatives are described, and potential effects are disclosed and evaluated. These alternatives represent possible ways to manage oil and gas leasing on 520,000 acres that are available for leasing. The alternatives are: ALTERNATIVE 1, Leasing consistent with the Forest Plan (No Action); ALTERNATIVE 2, Leasing with standard and special stipulations, consistent with the Forest Plan; ALTERNATIVE 3, Leasing with standard and …

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Proton–Donor Properties Of Water And Ammonia In Van Der Waals Complexes With Rare‐Gas Atoms. Kr–H2o And Kr–Nh3, G. Chalasinski, M. M. Szczesniak, Steve Scheiner Jan 1992

Proton–Donor Properties Of Water And Ammonia In Van Der Waals Complexes With Rare‐Gas Atoms. Kr–H2o And Kr–Nh3, G. Chalasinski, M. M. Szczesniak, Steve Scheiner

Chemistry and Biochemistry Faculty Publications

The perturbation theory of intermolecular forces in conjunction with the supermolecular Møller–Plesset perturbation theory is applied to the analysis of the potential‐energy surfaces of Kr–H2O and Kr–NH3 complexes. The valleylike minimum region on the potential‐energy surface of Kr–H2O ranges from the coplanar geometry with the C2 axis of H2O nearly perpendicular to the O–Kr axis (T structure) to the H‐bond structure in which Kr faces the H atom of H2O. Compared to the previously studied Ar–H2O [J. Chem. Phys. 94, 2807 (1991)] the minimum has more …

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Proton–Donor Properties Of Water And Ammonia In Van Der Waals Complexes With Rare‐Gas Atoms. Kr–H2o And Kr–Nh3, G. Chalasinski, M. M. Szczesniak, Steve Scheiner Jan 1992

Proton–Donor Properties Of Water And Ammonia In Van Der Waals Complexes With Rare‐Gas Atoms. Kr–H2o And Kr–Nh3, G. Chalasinski, M. M. Szczesniak, Steve Scheiner

Steve Scheiner

The perturbation theory of intermolecular forces in conjunction with the supermolecular Møller–Plesset perturbation theory is applied to the analysis of the potential‐energy surfaces of Kr–H2O and Kr–NH3 complexes. The valleylike minimum region on the potential‐energy surface of Kr–H2O ranges from the coplanar geometry with the C2 axis of H2O nearly perpendicular to the O–Kr axis (T structure) to the H‐bond structure in which Kr faces the H atom of H2O. Compared to the previously studied Ar–H2O [J. Chem. Phys. 94, 2807 (1991)] the minimum has more …

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Calculation Of Barriers To Proton Transfer Using Variations Of Multi-Configuration Self‐Consistent Field Methods. I. Combinations Of Orbitals, K. Luth, Steve Scheiner Jan 1992

Calculation Of Barriers To Proton Transfer Using Variations Of Multi-Configuration Self‐Consistent Field Methods. I. Combinations Of Orbitals, K. Luth, Steve Scheiner

Steve Scheiner

The usefulness of multiconfiguration self‐consistent‐field (MCSCF) calculations in computing correlated proton transfer potentials is investigated for the systems HF2−, H7N2+, H3O2−, and H5O2+. In deciding whether to include particular molecular orbitals, it is important to consider the balance of electron density between the donor and acceptor groups and the interactions that are incorporated in the orbitals. Only orbitals which have the proper symmetry to interact with the transferring hydrogen need be included in the MCSCF active space. Reasonable transfer barriers are obtained …

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Pulsed‐Laser Excited Differential Photothermal Deflection Spectrometry, Stephen E. Bialkowski, Xu Gu, Pete E. Poston, Linda S. Powers Jan 1992

Pulsed‐Laser Excited Differential Photothermal Deflection Spectrometry, Stephen E. Bialkowski, Xu Gu, Pete E. Poston, Linda S. Powers

Stephen E. Bialkowski

This paper describes a differential photothermal optical absorbance apparatus that uses two excitation beams at different wave-lengths. A single probe beam monitors the difference in heats generated by the two wavelengths. The theory is developed for the operational principles of the apparatus, and theoretical signals are compared with those obtained with a conventional absorption spectrophotometer. The differential photothermal apparatus has a theoretical advantage over conventional spectrophotometry for samples with less than unit absorbance. Experiments are described which verify the operating principles and demonstrate the flexibility of the apparatus.

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Tiger Team Assessment Of The Naval Petroleum And Oil Shale Reserves Colorado, Utah, And Wyoming, United States Department Of Energy Jan 1992

Tiger Team Assessment Of The Naval Petroleum And Oil Shale Reserves Colorado, Utah, And Wyoming, United States Department Of Energy

All U.S. Government Documents (Utah Regional Depository)

This report documents the Tiger Team Assessment of the Naval Petroleum and Oil Shale Reserves in Colordao, Utah, and Wyoming (NPOSR-CUW). NPOSR-CUW consists of Naval Petroleum Reserve Number 3 (NPR-3) located near Casper, Wyoming; Naval Oil Shale Reserve Number 1 (NOSR-1) and Naval Oil Shale Reserve Number 3 (NOSR-3) located near Rifle, Colorado; and Naval Oil Shale Reserve Number 2 (NOSR-2) located near Vernal, Utah, which was not examined as part of this assessment.

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Statistical Considerations In Rangeland Monitoring, United States Bureau Of Land Management Jan 1992

Statistical Considerations In Rangeland Monitoring, United States Bureau Of Land Management

All U.S. Government Documents (Utah Regional Depository)

This Technical Reference deals with the statistical aspects of rangeland monitoring and is intended to help the BLM range conservationist in planning, analyzing, interpreting, and evaluating monitoring studies. It is not a statistics cookbook and assumes a level of knowledge of statistical analysis comparable to what most college graduates are exposed to during their undergraduate training. The material covered in this Technical Reference is divided into five sections. Chapter 1 highlights the statistical topics required to analyze monitoring data and gives appropriate references. Chapter 2 addresses the underlying statistical issues of rangeland monitoring. Chapters 3 and 4 deal with the …

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Cultural Diversity & Adaptation: The Archaic, Anasazi, & Navajo Occupation Of The Upper San Juan Basin, United States Bureau Of Land Management Jan 1992

Cultural Diversity & Adaptation: The Archaic, Anasazi, & Navajo Occupation Of The Upper San Juan Basin, United States Bureau Of Land Management

All U.S. Government Documents (Utah Regional Depository)

Recent work in the upper San Juan Basin has more than doubled the number of known, as well as excavated, sites. Without exception, this work has modified and expanded long-held views of the PaleoIndian, Archaic, Anasazi, and Navajo people who inhabited the area. The papers presented in this volume reflect these changes and represent the cutting edge of southwestern archaeology.

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Selected Hydrologic Data For Cache Valley, Utah And Idaho, 1969-91, D. Michael Roark, Karen M. Hanson, U.S. Geological Survey Jan 1992

Selected Hydrologic Data For Cache Valley, Utah And Idaho, 1969-91, D. Michael Roark, Karen M. Hanson, U.S. Geological Survey

All U.S. Government Documents (Utah Regional Depository)

This report contains hydrologic data collected in Cache Valley from 1969 to 1991. The report area is in north-central Utah and southeast Idaho, within the Basin and Range physiographic province described by Fenneman (1931), and includes about 660 square miles. Most of the data in this report were collected by the U.S. Geological Survey in cooperation with the Utah Department of Natural Resources, Divisions or Water Resources and Water Rights. Some of the data collected before 1969 were previously published by McGreevy and Bjorklund (1970). The purpose of this report is to provide hydrologic data for use by the general …

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Agriculture Irrigation And Water Use, Rajinder S. Bajwa, William M. Crosswhite, John E. Hostetler, Olivia W. Wright, United States Department Of Agriculture, Economic Research Service Jan 1992

Agriculture Irrigation And Water Use, Rajinder S. Bajwa, William M. Crosswhite, John E. Hostetler, Olivia W. Wright, United States Department Of Agriculture, Economic Research Service

All U.S. Government Documents (Utah Regional Depository)

The 17 Western States, plus Arkansas, Florida, and Louisiana, account for 91 percent of all U.S. irrigated acreage, with the Western States alone contributing over 85 percent. This report integrates data on the distribution, characteristics, uses, and management of water resources from a wide variety of data sources. The report includes charts and tables on water use in irrigation; farm data comparing selected characteristics of irrigated and nonirrigated farms; and data on water application systems, sources of water, pump energy expenses by energy type, values of irrigated and nonirrigated land, and cash rents.

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