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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:
    Measurements of Soil Mois- ture for Irrigation Scheduling Abstract approved: Marshall English Soil moisture

  • An irrigation efficiency model for optimum irrigation management

    Creator:
    Isbell, Brett, 1978-
    Abstract:
    Improved water use efficiencies in irrigated agriculture are necessary to assist in coping with the accelerating demand and economic competition for the world's fresh water supply and increasing ecological concerns. This will likely rely in part on optimum irrigation, which implies regulated deficit irrigation. While conventional irrigation management is intended...
    Resource Type:
    Masters Thesis
    Full Text:
    Efficiency Model for Optimum Irrigation Management Abstract approved: J. English Improved water use

  • Estimating ground cover via spectral data

    Creator:
    Axness, Daniel S.
    Abstract:
    Potato ground cover and spectral data were measured in the Columbia Basin during the 1990 growing season. Three spectral were correlated with ground cover; normalized difference, near infrared-red ratio, and the first derivative of the spectral curve at 750 nm. All models were statistically significant at the 99% level. Normalized...
    Resource Type:
    Masters Thesis
    Full Text:
    for Privacy Marshall J. English Potato ground cover and spectral data were measured in the Columbia

  • Effect of plant surface area on organic carbon removal in wetlands

    Creator:
    Kuehn, Elaine Jinx
    Abstract:
    This study investigated the effect of plant surface area (plant density) on the efficiency of organic carbon removal in a bench-scale constructed wetland. Constructed wetlands are commonly assumed to be biofilm reactors in which organic carbon removal occurs primarily through sedimentation and aerobic degradation by attached microbial biofilms. In conventional...
    Resource Type:
    Masters Thesis
    Full Text:
    Removal in Wetlands. Abstract approved: Marshall J. English ABSTRACT This study investigated the

  • Estimation of true leaching requirement and resulting yield under different furrow irrigation practices

    Creator:
    Toraman, Haci Mustafa
    Resource Type:
    Masters Thesis
    Full Text:
    . Abstract approved: Marshall J. English When water supplies are limited or irrigation costs are high

  • Heat transfer predictions for aquaculture facilities

    Creator:
    Geiselman, James R.
    Abstract:
    Recycling of water in aquaculture facilities is used to minimize the amount of energy or tempered water required to control water temperatures. The rate of heat exchange between the water and the environment can be an important variable in the design, management, and economic analysis of a recycle system. A...
    Resource Type:
    Masters Thesis
    Full Text:
    Predictions for Aguaculture Facilities Abstract Approved: Marshall J. English Recycling of water in

  • Computer simulation to control environmental impact of water and nitrate leaching in furrow irrigated fields

    Creator:
    Raja, Syed Navaid
    Abstract:
    Nitrate contamination in ground and surface waters is of great concern to environmentalists. A two-dimensional model of water and solute movement in soils was used to test the usefulness and relative advantages of a two-dimensional model over a one dimensional model for analysis of deep percolation and nitrate leaching in...
    Resource Type:
    Masters Thesis
    Full Text:
    major professor, Dr. Marshall J. English, I would like to express my gratitude to him for the

  • Effects of irrigation frequency on yields of winter wheat

    Creator:
    Nakamura, Brian Clifford
    Abstract:
    Deliberately underirrigating a crop may yield economic benefits. The optimal use of water by an irrigator should be achieved under a deficit irrigation regime. It is important to know how water deficits affect yields and the interaction of the deficits with the scheduling of irrigations. A field experiment was conducted...
    Resource Type:
    Masters Thesis
    Full Text:
    Irrigation Frequency on Yields of Winter Wheat Abstract Approved: Marshall J. nqiish Deliberately

  • Modeling the uncertainty of evapotranspiration estimates

    Creator:
    El Khoury, Laureine
    Abstract:
    Under today's environmental conditions and with the increasing worldwide competition for water, errors in irrigation management decisions can be costly. Therefore, providing both accurate evapotranspiration estimation on a daily basis and estimation of the magnitude of error associated with this estimate is vital for informed water management decisions that allow...
    Resource Type:
    Masters Thesis
    Full Text:
    : ________________________________________________________ Marshall J. English Under today’s environmental conditions and with the increasing

  • Linking GIS and a surface irrigation model to evaluate regional effects of furrow irrigation strategies

    Creator:
    Faux, Russell N.
    Abstract:
    The shallow aquifer in Northeast Malheur County, Oregon is polluted with Nitrates at concentrations exceeding federal drinking water standards. Efforts to solve the groundwater problems in this area have focused on developing farm management practices that will increase groundwater quality while maintaining agricultural production. Furrow irrigation is the dominant practice...
    Resource Type:
    Masters Thesis
    Full Text:
    . Abstract approved. Marshall J. English The shallow aquifer in Northeast Malheur County, Oregon is