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Full-Text Articles in Earth Sciences
Model For Predicting Simultaneous Distribution Of Salt And Water In Soils, Satish C. Gupta
Model For Predicting Simultaneous Distribution Of Salt And Water In Soils, Satish C. Gupta
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Knowledge of water and salt movement in soils is necessary for development of a management scheme for controlling the quality of irrigation return flow. A computer model was developed to predict the distribution of water and salts in the root zone under varying initial and boundary conditions. The model consists of water flow and salt flow sub-models. The water flow sub-model considers the numerical approximation of the general water flow equation with modification for water loss by evapotranspiration (and thus root extraction). The salt flow sub-model considers the mass flow of salts, chemical exchange, precipitation or dissolution of CaCO3 …
Evaluation Of The Filter Paper Method For Estimating Soil Water Potential, Samir Al-Khafaf
Evaluation Of The Filter Paper Method For Estimating Soil Water Potential, Samir Al-Khafaf
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The filter paper method for measuring soil water potential was evaluated. The method was calibrated using salt solutions (-1.4 bars to -22.4 bars), sample chamber psychrometer (-1 to -50 bars), pressure plate (-0.1 to -15 bars) and soil column at equilibrium (0 to -0.2 bars). It was found that the absolute temperature had little effect on the predicted soil water potential, but a temperature variation had a large effect. It was found that the temperature fluctuation must be small. The predicted water potential was influenced by the type of contact of the soil with the filter paper. It is suggested …
Interbasin Water Transfers And Groundwater Regulation In Nebraska, D. D. Axthelm, V. H. Dreeszen, C. A. Lewis
Interbasin Water Transfers And Groundwater Regulation In Nebraska, D. D. Axthelm, V. H. Dreeszen, C. A. Lewis
Conservation and Survey Division
On November 29, 1971, the Hamilton County Ground Water Con·servation District sponsored a meeting on groundwater management and regulation. The meeting was held at Aurora, Nebraska, and was designed for irrigators from groundwater conservation districts and county irrigation associations. Various men from state and federal agencies spoke about a variety of problems that a.re related to groundwater management. Two of the talks that were presented at the meeting are reproduced here, as is a discussion of the rules and regulations that relate to the use of groundwater in the state of Nebraska.