Index Catalog // ScholarsArchive@OSU

Uncertainty in neutron probe measurements of soil moisture for irrigation scheduling

Creator:: Wright, Norman D.
Abstract:: Soil moisture in a crop's root zone must be regularly monitored to accurately predict crop water requirements. Most irrigation scheduling services currently use the neutron probe to monitor soil moisture. Unfortunately, there is a degree of variability associated with use of the neutron probe creating uncertainty in measurements of soil...
Resource Type:: Masters Thesis
Full Text:: must be frequently checked against measurements of soil moisture taken in situ. Measurement of a

Water content and electrical conductivity profile measurements for dispersive media using enhanced time domain and frequency domain models

Creator:: Flugstad, Benjamin A.
Abstract:: Water conservation and water quality are rapidly increasing in importance in all areas of the world. The ability to accurately measure soil water content and salinity, over a wide variety of conditions, is key to meeting this need. A set of forward prediction models and waveform interpretation algorithms to extract...
Resource Type:: Dissertation
Full Text:: Irrigation) . 240 Figure 4.3a: Soil Moisture Content Measurement Cell w/PCBA at Bottom and Parallel Wire

Calculated and field-measured soil heat flux : a comparison under two soil water regimes

Creator:: Pikul, Joseph L.
Abstract:: Heat and water vapor flow in summer-fallowed fields in the Pacific Northwest may significantly affect the position and supply of water for germination of fall sown crops. New tillage tools and drill openers used in reduced tillage systems leave a trashy, residue covered surface in contrast to the traditional bare...
Resource Type:: Masters Thesis
Full Text:: moisture flow. Soil temperature responses to soil heat flow during the warm part of the season alter the

Field evaluation of passive capillary samplers in monitoring the leaching of agrochemicals

Creator:: Brandi-Dohrn, Florian M.
Abstract:: Soil solution samplers have certain inadequacies that limit their range of possible applications. Passive Capillary Samplers (PCAPS), which apply suction to the soil pore-water via a fiber glass wick, have shown promising results in preliminary experiments in regard to collection efficiency of water and of bromide tracers. The objectives of...
Resource Type:: Masters Thesis
Full Text:: : Redacted for Privacy John S. Selker Soil solution samplers have certain inadequacies that limit their

A predictive model for time domain reflectometry soil water content and salinity measurements

Creator:: Flugstad, Benjamin A.
Abstract:: Soil water content and water potential are two important parameters in determining the status of water in the soil. Improvement in the ability to measure these parameters by way of increased speed, accuracy, resolution, imaging volume, ease of automation, as well as reduced calibration requirements and reduced soil disturbance would...
Resource Type:: Masters Thesis
Full Text:: Page 1. INTRODUCTION 1 2. OVERVIEW OF SOIL MOISTURE MEASUREMENT TECHNIQUES 5 2.1 Direct Methods of

Measurement and interpretation of physical properties of soils

Creator:: Nagpal, Narender Kumar, 1942-
Abstract:: One of many important physical properties that must be known to understand transport phenomena in soils is pore size distribution. Presently the pore size distributions of soils are most commonly obtained from soil water characteristic curves. The soil water characteristic curves are usually obtained by the pressure plate technique. It...
Resource Type:: Dissertation
Full Text:: Measurement and interpretation of physical properties of

Duration of saturation and redox potentials in selected Willamette Valley soils

Creator:: Austin, Will
Resource Type:: Masters Thesis
Full Text:: of Saturation 2 Classifying Soil Moisture Conditions 4 Piezometers and Tensiometers 4 Reduction

Addressing Data Resolution in Precision Agriculture

Creator:: Kelley, Jason
Abstract:: Irrigated agriculture constitutes the greatest consumptive water use globally, so that irrigation efficiency measures are an important part of global efforts to best utilize this limited resource. However, greater irrigation efficiency must be achieved while simultaneously maintaining or increasing crop yields and farming profitability. Incremental water use decisions are made...
Resource Type:: Dissertation
Full Text:: irrigation demand. Soil moisture measurement helps determine how much water that is available to crops

Improving soil water determination in spatially variable field using fiber optic technology and Bayesian decision theory

Creator:: Sayde, Chadi
Abstract:: Achieving and maintaining sustainability in irrigated agriculture production in the era of rapidly increasing stress on our natural resources require, among other essential actions, optimum control and management of the applied water. Thus, a significant upgrade of the currently available soil water monitoring technologies is needed. The primary goal of...
Resource Type:: Dissertation
Full Text:: limited the problem of measurement uncertainty is often circumvented by maintaining soil moisture at

Towards autonomous irrigation : comparison of two moisture sensing technologies, irrigation distribution analysis, and wireless network performance at an ornamental container nursery

Creator:: Bailey, Daniel R.
Abstract:: As ornamental container nurseries face diminishing water allocations, many are looking to automated irrigation solutions to increase their water application efficiency. This thesis presents the findings of a study conducted at a commercial container nursery to determine 1) whether a capacitance or load cell sensor was better suited for monitoring...
Resource Type:: Masters Thesis
Full Text:: ................................ 25 1.12 Ideal soil moisture retention curve

ScholarsArchive@OSU

Uncertainty in neutron probe measurements of soil moisture for irrigation scheduling

Water content and electrical conductivity profile measurements for dispersive media using enhanced time domain and frequency domain models

Calculated and field-measured soil heat flux : a comparison under two soil water regimes

Field evaluation of passive capillary samplers in monitoring the leaching of agrochemicals

A predictive model for time domain reflectometry soil water content and salinity measurements

Measurement and interpretation of physical properties of soils

Duration of saturation and redox potentials in selected Willamette Valley soils

Addressing Data Resolution in Precision Agriculture

Improving soil water determination in spatially variable field using fiber optic technology and Bayesian decision theory

Towards autonomous irrigation : comparison of two moisture sensing technologies, irrigation distribution analysis, and wireless network performance at an ornamental container nursery

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