Index Catalog // ScholarsArchive@OSU

Simulation and field validation of heat and water flow during soil freezing and thawing

Creator:: Pikul, Joseph Lawrence
Abstract:: Freeze/thaw cycles are numerous in agricultural soils of the Pacific Northwest. Potential loss of soil by erosion is high whenever a soil thaws from the surface creating a saturated soil overlying an impermeable frozen layer. Field studies were conducted to investigate the effect of surface residue on soil freezing. Residue...
Resource Type:: Dissertation
Full Text:: residue on soil freezing. Residue treatments were: 1) bare surface, B; 2) standing stubble with no straw

Gaussian elimination technique for solving the diffusion equation for moisture movement in unsaturated soil

Creator:: Ashcroft, Gaylen L.
Resource Type:: Dissertation
Full Text:: little improvement over the old apparatus except in ease of control. Nielsen and Biggar (29) described

Pore size distributions as measured by the mercury intrusion method and their use in predicting permeability

Creator:: Klock, Glen O.
Abstract:: A number of investigators have proposed equations to predict the permeability of porous media. Most of their equations are based on the distributions of the sizes of the various contributing pores in the medium. Presently the pore size distributions of agricultural soils are most commonly obtained from soil water release...
Resource Type:: Dissertation
Full Text:: Research, United States Department of the Interior under Project B -001 -ORE of the Oregon Water Resource

The steady state flow of water through unsaturated soil in the low capillary potential region

Creator:: Stammers, William Norman
Abstract:: Several investigators have recently called attention to the fact that the flux equation for water movement in unsaturated soils may not be an appropriate mathematical model for the development of the theory of unsaturated flow phenomena. An analytical theory is developed for the purpose of testing the validity of the...
Resource Type:: Dissertation
Full Text:: . Nielsen et al.(22) using the same method obtained results inconsistent with the square root of time

Nitrogen uptake by wheat (Triticum aestivum VILL., Host) as a function of root temperature and plant water stress

Creator:: Sepaskhah, Ali Reza
Abstract:: The effect of soil temperature and plant water stress on nitrogen uptake, growth rate and transpiration rate of wheat (Triticum aestivum VILL. , Host) seedlings was studied. A special apparatus for the control of plant water stress and root temperature was used. Leaf area was measured by the air flow...
Resource Type:: Masters Thesis
Full Text:: grown at different soil temperatures (Nielsen et al. , 1960; Nielsen et al. , 1961; Stoffer and van

Theoretical and experimental evaluation of transfer of 2, 4-dichlorophenoxyacetic acid in porous media

Creator:: Saxena, Subodh Kumar, 1942-
Abstract:: Experiments were conducted to study the effect of pore size distribution on the diffusion of 2, 4-Dichlorophenoxyacetic acid (carbon- 14) through water saturated porous media. Eight size fractions of glass beads were used representing the porous media. It was found that as the average particle radius, and hence pore radius,...
Resource Type:: Dissertation
Full Text:: Research, United States Department of the Interior (grant No. B-001-ORE), the Oregon Agricultural

Temperature and water potential effects on physiological functions of sudangrass (Sorghum vulgare var. Piper)

Creator:: Young, Richard Su-Shung
Abstract:: Temperature and water potential effects on the growth, transpiration, total nonstructural carbohydrate (TNC) content, and nutrient uptake of sudangrass (Sorghum vulgare var. piper) were investigated in laboratory experiments. The effect of nitrogen supply on the growth and nutrient uptake at constant soil water potential was also investigated in this study....
Resource Type:: Dissertation
Full Text:: of -0.35 bars. A-4. Values of the parameters a, b and correlation coef- ficient r obtained by

The transpiration process as a function of environmental parameters

Creator:: Cox, Lloyd Morris
Abstract:: The influence of soil moisture stress and soil temperature on transpiration has never been determined explicitly. This relationship has been neglected mainly because of the lack of a satisfactory method to control soil moisture stress. A technique was developed to evaluate this relationship by controlling soil moisture stress with osmotic...
Resource Type:: Dissertation
Full Text:: the plant roots after prolonged immersion, (5) biological decomposition of the — Michel, B. E

Leaf elongation as a function of soil water potential and photoperiod

Creator:: Hodges, T.
Abstract:: Leaf elongation is a major indicator of plant growth. It is controlled by complex interactions of many factors including light intensity, photoperiod, water availability, atmospheric conditions, and plant water stress. In this study, the response of leaf elongation to length of photoperiod and to plant water stress as indicated by...
Resource Type:: Masters Thesis
Full Text:: root temperatures than is ion transport from the roots to the shoots (Nielsen and Humphries, 1966

Soil water potential and soil temperature effects on growth and nutrient uptake of sudangrass seedlings (Sorghum vulgare var. Piper)

Creator:: Al-Omran, Abdrubalrasol Mosa
Resource Type:: Dissertation
Full Text:: turgor potential and leaf water potential for (a) full turgor maintenance, (b) partial turgor maintenance

ScholarsArchive@OSU

Simulation and field validation of heat and water flow during soil freezing and thawing

Gaussian elimination technique for solving the diffusion equation for moisture movement in unsaturated soil

Pore size distributions as measured by the mercury intrusion method and their use in predicting permeability

The steady state flow of water through unsaturated soil in the low capillary potential region

Nitrogen uptake by wheat (Triticum aestivum VILL., Host) as a function of root temperature and plant water stress

Theoretical and experimental evaluation of transfer of 2, 4-dichlorophenoxyacetic acid in porous media

Temperature and water potential effects on physiological functions of sudangrass (Sorghum vulgare var. Piper)

The transpiration process as a function of environmental parameters

Leaf elongation as a function of soil water potential and photoperiod

Soil water potential and soil temperature effects on growth and nutrient uptake of sudangrass seedlings (Sorghum vulgare var. Piper)

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