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Showing 1 to 20 of 155 for “"soil profile"”.
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An opto-electronic soil profile meter
A mechanical, non-contact soil profile meter was developed to measure soil elevations before and after an artificial rainfall for erosion studies. The design goals were to measure the heights of the soil in a 1.5 x 1.5 m bin with an accuracy of ±1.0 mm and at a data collection rate of 2 points per …
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Trickle Irrigation; A Study of Moisture Distribution in the Soil Profile
… rate on the distribution of moisture in heavy soils under a trickle source were subjects of this investigation.
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Urea Hydrolysis in Soil Profile Toposequences: Mechanisms Relevant to Nitrogen Transport and Water Quality
… studies of its hydrolysis in agricultural soils have concluded that urea does not persist long enough to be transported to surface waters. This paradox in the published literature may be explained by our lack of knowledge regarding the soil chemical conditions that affect microbial urease …
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A mathematical simulation model for the movement of water and nitrate in the soil profile
Made available in DSpace on 2017-05-18T15:22:30Z (GMT). No. of bitstreams: 2 3608181_opt.pdf: 3428039 bytes, checksum: 9a727170b3b6ce7f67fb78fc5e452cc0 (MD5) license.txt: 4813 bytes, checksum: 715c4321821a960fa1a1e91d2ac7ebce (MD5) Previous issue date: 1974
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Fertilizer source and placement affect nutrient mobility through the soil profile and productivity of maize
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-20 without embargo terms
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Development of a nitrogen balance in a laboratory soil profile with a heavy application of beef cattle wastes
Digitized by Kansas Correctional Industries
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Variations in Water Storage Capacity of a Mountain Peatland with Complex Stratigraphy
… in mountain regions tend to have a complex soil profile due to the geomorphologically dynamic environment. There is little information on the water storage capacity of mountain peatlands. To address this knowledge gap, the water storage capacity of a fen peatland with a complex soil profile …
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Estimation of Non-Linear Seismic Site Effects for Deep Deposits of the Mississippi Embayment
… The coefficients are developed for 30 m thick soil profile and do not account for the depth of the soil column. A suite of ground motion time histories are developed that in sum result in the same hazard level as USGS hazard maps. The generated motions are propagated through the generic …
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A soil-based measure of evapotranspiration
A soil based measure of evapotranspiration was field tested in the growing seasons of 1987 and 1988. This method relies on: (1) tracking the plane of zero flux (PZF) in a soil profile over time and (2) quantification of the change in moisture content, above the PZF, in the soil profile over time. …
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One-dimensional site response analyses in potentially liquefiable soil profiles
The seismic performance of soil profiles with potentially liquefiable deposits is a complex phenomenon that requires a thorough understanding of the soil properties and ground motion characteristics. The limitations of simplified liquefaction assessment methods have prompted an increase in the use …
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Full Scale Static Lateral Load Test of a 9 Pile Group in Sand
… and tested for comparison to the pile group. The soil profile consisted of a top layer of sand about 2.5 meters deep underlain by alternating layers of fine grained soil and sand. Analysis was done in order to determine p-multipliers for the rows in the pile group. The pile group consistently …
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The lazy root : Will a change in the rainfall regime or increased anthropogenic nitrogen result in an alteration in the competitive balance between trees and grassed in a semi-arid South Africa savanna?
… due to spatial differences in their rooting profiles. Subsequent studies in various savannas around the world have found that this is often not the case. In the central region of the Kruger National Park February & Higgins (2010) found that trees and grasses root at the same depths within the …
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Pedogenesis on the Sefton Coastal Dunes, NW England
… the use of pedo-properties to identify dune soil system responses to environmental change on the Sefton coast, based on the development of conceptual pedogenic models. Previous environmental change and shoreline dynamics are determined through O.S. maps and aerial photographs, while present …
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Seismic site response analysis and extraction of dynamic soil behavior and pore pressure response from downhole array measurements
… used to predict ground response due to local soil effects. Advancements in the knowledge of shear-induced excess pore pressure generation has led to the development and implementation of pore pressure response models for site response analysis with effective stress consideration. This thesis …
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ΕΠΙΛΥΣΗ ΠΡΟΒΛΗΜΑΤΩΝ ΚΙΝΗΣΗΣ ΤΟΥ ΕΔΑΦΙΚΟΥ ΝΕΡΟΥ ΚΑΙ ΤΩΝ ΔΙΑΛΥΜΕΝΩΝ ΟΥΣΙΩΝ ΜΕ ΜΕΘΟΔΟΥΣ ΠΕΠΕΡΑΣΜΕΝΩΝ ΣΤΟΙΧΕΙΩΝ
… IN A ONE-DIMENSIONAL SATURATED-UNSATURATED SOIL PROFILE WITHMETHODS OF FINITE ELEMENTS. THE NUMERICAL SOLUTIONS ARE BASED UPON FOUR FINITEELEMENT SCHEMES: A) THE STANDARD GALERKIN METHOD (SGM), B) THE MASS LUMPING FINITE ELEMENT METHOD (MLGM), C) THE SIMPLE MASS LUMPING FINITE ELEMENT METHOD …
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A multi-disciplinary approach to the characterization of waterlogged burial environments : assessing the potential for the in situ preservation of organic archaeological remains
… parameters were monitored through the soil profile and integrated with a study of the composition and activity of the microbial community.Soil cores were taken from two wetland sites located in the Humberhead Levels in Yorkshire: Hatfield Moor and Sutton Common. Cores were subsampled at …
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Defining practical limits for centre-pivot length and irrigation management on Lismore soils
… and application depth on the dynamics of the soil moisture profile and on the quantity and timing of drainage through the profile, particularly for longer centrepivots, where shorter but more intense applications of water typically occur. The potential for design and management strategies to …
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The Fate of Dcpa and Diazinon in Turf Using Model Ecosystems
… metabolites which were leached through the soil profile. Increasing irrigation caused an increased rate of Dacthal degradation. The presence of a thatch layer caused a variable effect on the rate of degradation of Dacthal.
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Role of Vegetation and Environmental Characteristics on Slope Stability in Northwest Arkansas
… conducted to investigate the effects of slope, soil texture, vegetation cover, bedrock permeability, and compaction,. A wooden flume with a slope face 1 m wide by 1.5 m long with a 10 cm toe was constructed to contain soil upon which simulated rainfall was applied. The length of time from the …
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Manganese deposits of the Cape Peninsula, South Africa
… of manganese and iron oxides within the soil profile by acidified rain water, further leaching of oxides as reducing groundwaters flow through regolith and bedrock, and the eventual precipitation as oxides at groundwater seeps and springs. Field observations and the chemistry of water and …
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