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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

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

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

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

Design of capillary wick pore-water samplers and their effects on solute travel time and dispersion

Creator:: Knutson, John H.
Resource Type:: Masters Thesis
Full Text:: cleaned and its hydraulic conductivity, scaled by the area of soil sampled, is matched to the

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

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

Comparison of techniques for calibration of gypsum and fiberglas electrical resistance units for soil moisture measurement

Creator:: Twersky, Marvin
Resource Type:: Masters Thesis
Full Text:: fiberglas electrical resistance units for soil moisture measurement COMPARISON OF TECHNIQUES IT)R

Influence of soil moisture on the movement of bromacil in soil

Creator:: Ross, Claude Gray
Abstract:: In previous research, bromacil gave good performance when it was applied in early fall with fairly dry soil conditions and before the fall germinating weeds had started growth. On the other hand, if bromacil was applied in late November, December, or January on nearly saturated soil with weeds that had...
Resource Type:: Masters Thesis
Full Text:: Farm Crops (Degree) Date thesis is presented June 10, 1966 Title INFLUENCE OF SOIL MOISTURE ON THE

The distribution of moisture condensed from saturated air flowing through cooled porous media

Creator:: Shen, Chung-Yi
Resource Type:: Masters Thesis
Full Text:: powder) 49 27. Moisture distribution in sandy soil 50 28. Moisture distribution in sandy soil with

ScholarsArchive@OSU

Uncertainty in neutron probe measurements of soil moisture for irrigation scheduling

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

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

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

Design of capillary wick pore-water samplers and their effects on solute travel time and dispersion

Duration of saturation and redox potentials in selected Willamette Valley soils

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

Comparison of techniques for calibration of gypsum and fiberglas electrical resistance units for soil moisture measurement

Influence of soil moisture on the movement of bromacil in soil

The distribution of moisture condensed from saturated air flowing through cooled porous media

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