Дисертації з теми "Zone of improved soil"
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Zhang, Hongjuan [Verfasser]. "Improved characterization of root zone soil moisture by assimilating groundwater level and surface soil moisture data in an integrated terrestrial system model / Hongjuan Zhang." Jülich : Forschungszentrum Jülich GmbH, Zentralbibliothek, 2018. http://d-nb.info/1163839310/34.
Повний текст джерелаErindi-Kati, Anila. "Remote sensing and root zone soil moisture." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=84027.
Повний текст джерелаTwo fields were examined, one at the Macdonald Campus of McGill University and the other near St. Jean-sur-Richelieau. Three approaches were used; (1) a hand-held hyper-spectral sensor (350-2500 nm), (2) a Geonics RTM EM-38 conductivity meter and, (3) gravimetric soil moisture sampling.
The first experiment (at St. Jean-sur-Richelieu) investigated the possibility of monitoring soil moisture with the EM_38, in the presence of field elevation and soil texture. The second experiment (at Macdonald Campus) investigated the possibility of using hyper-spectral sensor data for determination of soil characteristics in the root zone, in the presence of such factors as (a) irrigation (main treatment), (b) nitrogen (sub-treatment), and (c) weed control (sub-sub-treatment). Statistical regression analyses and Artificial Neural Network models were used to select the best waveband region for determination of soil root zone moisture.
The coefficients of determination obtained by the statistical analyses ranged from 0.75 to 0.94. The wavebands most frequently identified by these analyses ranged from 1100 nm-1900 nm.
The performances of the ANN training models were considered acceptable (R2 from 0.6 to 0.8). The lack of sufficient data greatly impacts this approach.
Joshi, Gyawali Ayush. "A fresh soil health perspective: Soil health dynamics and improved measurement techniques." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/89949.
Повний текст джерелаDoctor of Philosophy
If we want to make sure that ample and safe food is available to future generations, then it is time that we produce food without damaging the soil. Many widely used soil management techniques like tillage and leaving the field bare can harm the soil and decrease productivity in the long run. One potential technique to produce food while protecting the soil and environment is conservation agriculture, which can include reduced tillage and cover cropping. Reduced tillage is a technique in which we grow food without majorly disturbing the soil, while cover crops are planted when cash crops are not in the field in order to improve or sustain the soil. Understanding the soil-related benefits of conservation agriculture practices is important to encourage farmers to adopt these practices. In this study we tested the effects on soils of reduced tillage and cover crop practices versus conventional tillage and bare soil practices, using five locations across Virginia. We also developed improved methods for measuring two informative soil parameters. We found that, when looking at all of our five sites, the stability of soil aggregates, the rate at which water enters soil, and the nutrients in surface soils were all affected by the type of management that the soils were subjected to. Reduced tillage increased stability of soil aggregates when compared with conventional till. This increased stability of aggregates indicators lower potential for surface water runoff, erosion, and flooding when we practice reduced tillage. Cover cropping also increased stability of soil aggregates, especially when the cover crops attained substantial above-ground mass. Soil nutrients (which are essential for plants to grow) were also overall higher in the surface soil layers under no-till. Since the stability of soil aggregates was found to be an important benefit of CA practices, we also perceived a need for a better method for measuring stability of these aggregates. In response, we developed a new index called Integrated Aggregate Stability (IAS). IAS was found to give similar results as established methods, but the time required to get IAS result is about 10 minutes, whereas the time required for established methods like wet sieving is around 2 days. IAS measurements are therefore both accurate and quick to perform. We also focused on developing an inexpensive tool for measuring soil respiration. Soil respiration-based measurements help us to understand the activity of microbes in the soil. These microbes are very important for soils to function. Our tool, Soil Microbial Activity Assessment Contraption (SMAAC), was very consistent with a currently used tool and shows high potential for future use. Altogether, we found that no-tillage and cover cropping can increase stability of soil aggregates even within 1-3 years of starting those practices. No-till can also increase nutrient concentrations in the top soil layer. The tools and innovations developed in this study have the potential to increase the ability of farmers to assess soil health and also encourage greater adoption of conservation agriculture practices.
Zhang, Jing. "Modeling considerations for vadose zone soil moisture dynamics." [Tampa, Fla.] : University of South Florida, 2007. http://purl.fcla.edu/usf/dc/et/SFE0001982.
Повний текст джерелаOmotere, Olumide Olubunmi. "Improvement of the Soil Moisture Diagnostic Equation for Estimating Root-Zone Soil Moisture." Thesis, University of North Texas, 2018. https://digital.library.unt.edu/ark:/67531/metadc1157607/.
Повний текст джерелаWetterlind, Johanna. "Improved farm soil mapping using near infrared reflection spectroscopy." Uppsala : Dept. of Soil and Environment, Swedish University of Agricultural Sciences, 2009. http://epsilon.slu.se/200968.pdf.
Повний текст джерелаГубашова, Валентина Євгенівна. "Обґрунтування раціональних технологічних параметрів струменевої цементації в складних геотехнічних умовах". Doctoral thesis, Київ, 2021. https://ela.kpi.ua/handle/123456789/40256.
Повний текст джерелаFall, Thioro. "Soil Management for Improved Rice Production in Casamance, Senegal." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/81457.
Повний текст джерелаMaster of Science
Inoue, Keisuke. "ESTIMATION OF DAMAGED ZONE IN SOIL USING RESISTIVITY MONITORING." Kyoto University, 2017. http://hdl.handle.net/2433/225322.
Повний текст джерелаMahmood-Ul-Hassan, Muhammad. "Water movement through the unsaturated zone." Thesis, University of Reading, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244907.
Повний текст джерелаWorrall, Jonathan Stewart James. "Pesticide mobility in the unsaturated zone." Thesis, University of Reading, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264291.
Повний текст джерелаLarsson, Daniel. "Cryogenic Etching of the Electroplating Mold for Improved Zone Plate Lenses." Thesis, KTH, Applied Physics, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12109.
Повний текст джерелаThe fabrication of zone plate lenses that are used for focusing X-rays relies on nanofabrication techniques such as e-beam lithography, reactive ion etching, and electroplating. The circular grating-like zone plate pattern can have a smallest half-period, a so-called zone width, of down to 20 nm while it also needs to have a height that is 5 to 10 times the zone width to have good diffraction efficiency. This high aspect ratio structuring is a very challenging field of nanofabrication.
This diploma project has focused on improving the process step of fabricating the electroplating mold by cryo-cooling the polymer during the reactive ion etching with O2. The low temperature causes passivation of the sidewalls of the mold during etching which results in a more ideal rectangular profile of the high aspect ratio plating mold.
By etching at -100 °C, structures with highly vertical sidewalls and no undercut were realized. The experiments showed that there is a tradeoff between the anisotropy of the zone profile and the formation rate of polymer residue, so-called RIE grass. Through a proper choice of process parameters the grass could be completely removed without introducing any undercut.
QC 20100414
Gooding, Dominic Edward Maxwell. "Improved processes for the production of soil-cement building blocks." Thesis, University of Warwick, 1994. http://wrap.warwick.ac.uk/4453/.
Повний текст джерелаDuckett, Natasha-Rass. "Development of improved predictive tools for mechanical soil root interaction." Thesis, University of Dundee, 2014. https://discovery.dundee.ac.uk/en/studentTheses/8bf8f2d1-f50a-4c5d-aabc-737b693fb37f.
Повний текст джерелаAmter, Steven 1956. "Injection/recovery lysimeter technique for unsaturated zone soil-water extraction." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/191933.
Повний текст джерелаKlinka, Karel. "Forest floor dynamics across a chronosequence in the coastal western hemlock zone." Forest Sciences Department, University of British Columbia, 1997. http://hdl.handle.net/2429/653.
Повний текст джерелаMbarushimana, Kagabo Desire. "Modelling the soil water balance of potatoes for improved irrigation management." Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-07192007-134318.
Повний текст джерелаCrawford-Flett, Kaley A. "An improved hydromechanical understanding of seepage-induced instability phenomena in soil." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/46709.
Повний текст джерелаOwens, Philip Neil. "Towards improved interpretation of caesium-137 measurements in soil erosion studies." Thesis, University of Exeter, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384997.
Повний текст джерелаKruger, Matthew Wayne. "Can Soil Microbial Activity Be Improved With the Use of Amendments?" Thesis, North Dakota State University, 2020. https://hdl.handle.net/10365/31824.
Повний текст джерелаParry, Samuel Aneurin. "Turning rock into soil : variations in soil mineral reactivity, surface area and porosity through the critical zone." Thesis, University of Reading, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.559249.
Повний текст джерелаKoikkalainen, Riitta Katariina. "Influence of nitrogen on below ground dynamics in improved grasslands." Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=33591.
Повний текст джерелаCarter, Lyle, Joe Chesson, Gary Thacker, and Vic Penner. "Tillage Energy Savings from Zone Burial of Shredded and Whole Cotton Stalks." College of Agriculture, University of Arizona (Tucson, AZ), 1996. http://hdl.handle.net/10150/210922.
Повний текст джерелаKichler, Corey Mitchell Zech Wesley C. "Assessment of equipment performance variables for improved management during tillage operations." Auburn, Ala, 2008. http://repo.lib.auburn.edu/EtdRoot/2008/SPRING/Civil_Engineering/Thesis/Kichler_Corey_32.pdf.
Повний текст джерелаMulengera, Matthew Kagorobha. "Soil loss prediction in the semi-arid tropical savanna zone : a tool for soil conservation planning in Tanzania." Thesis, University of Newcastle Upon Tyne, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318175.
Повний текст джерелаOlgun, Celal Guney. "Performance of Improved Ground and Reinforced Soil Structures during Earthquakes – Case Studies and Numerical Analyses." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/26002.
Повний текст джерелаPh. D.
Diallo, Ndeye Helene. "Improved Management of Acid Sulfate Soils for Rice Production in Casamance, Senegal." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/81697.
Повний текст джерелаMaster of Science
Groenendyk, Derek G., Ty P. A. Ferré, Kelly R. Thorp, and Amy K. Rice. "Hydrologic-Process-Based Soil Texture Classifications for Improved Visualization of Landscape Function." Public Library of Science, 2015. http://hdl.handle.net/10150/621327.
Повний текст джерелаSoils lie at the interface between the atmosphere and the subsurface and are a key component that control ecosystem services, food production, and many other processes at the Earth’s surface. There is a long-established convention for identifying and mapping soils by texture. These readily available, georeferenced soil maps and databases are used widely in environmental sciences. Here, we show that these traditional soil classifications can be inappropriate, contributing to bias and uncertainty in applications from slope stability to water resource management. We suggest a new approach to soil classification, with a detailed example from the science of hydrology. Hydrologic simulations based on common meteorological conditions were performed using HYDRUS-1D, spanning textures identified by the United States Department of Agriculture soil texture triangle. We consider these common conditions to be: drainage from saturation, infiltration onto a drained soil, and combined infiltration and drainage events. Using a k-means clustering algorithm, we created soil classifications based on the modeled hydrologic responses of these soils. The hydrologic-process-based classifications were compared to those based on soil texture and a single hydraulic property, Ks. Differences in classifications based on hydrologic response versus soil texture demonstrate that traditional soil texture classification is a poor predictor of hydrologic response. We then developed a QGIS plugin to construct soil maps combining a classification with georeferenced soil data from the Natural Resource Conservation Service. The spatial patterns of hydrologic response were more immediately informative, much simpler, and less ambiguous, for use in applications ranging from trafficability to irrigation management to flood control. The ease with which hydrologic-process-based classifications can be made, along with the improved quantitative predictions of soil responses and visualization of landscape function, suggest that hydrologic-process-based classifications should be incorporated into environmental process models and can be used to define application-specific maps of hydrologic function.
Martin, Teri L. "Groundwater nitrate removal and soil microbial community structure in a riparian zone." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0011/MQ33250.pdf.
Повний текст джерелаJennings, John A. "Rotation interval, soil texture, and zone of influence studies on alfalfa autotoxicity /." free to MU campus, to others for purchase, 1996. http://wwwlib.umi.com/cr/mo/fullcit?p9737851.
Повний текст джерелаNewill, Paul Anthony. "Imaging of soil moisture in the root zone using capacitively coupled electrodes." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/imaging-of-soil-moisture-in-the-root-zone-using-capacitively-coupled-electrodes(24dbb858-3a0f-4fd7-8956-0070d2e47283).html.
Повний текст джерелаMillar, Neville. "The effect of improved fallow residue quality on nitrous oxide emissions from tropical soils." Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268667.
Повний текст джерелаOuattara, Korodjouma. "Improved soil and water conservatory managements for cotton-maize rotation system in the western cotton area of Burkina Faso /." Umeå : Dept. of Forest Ecology and Management, Swedish University of Agricultural Sciences, 2007. http://epsilon.slu.se/200754.pdf.
Повний текст джерелаAllen, Charles Edward. "Alpine Soil Geomorphology: The Development and Characterization of Soil in the Alpine-Subalpine Zone of the Wallowa Mountains, Oregon." PDXScholar, 1995. https://pdxscholar.library.pdx.edu/open_access_etds/5217.
Повний текст джерелаFuentes, San Román Ignacio Francisco. "Soil hydraulics associated with soil physical properties and their effects on nitrate leaching in the mediterranean zone of Chile." Tesis, Universidad de Chile, 2013. http://repositorio.uchile.cl/handle/2250/151712.
Повний текст джерелаSnelson, Jonathan Bundy. "Plant Growth and Root Zone Management of Greenhouse Grown Succulents." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/32398.
Повний текст джерелаMaster of Science
Morrison, Candice N. "Innovative Methods for Characterizing Chlorinated Volatile Organic Compounds in the Vadose Zone." Diss., The University of Arizona, 2014. http://hdl.handle.net/10150/333041.
Повний текст джерелаHolleran, Molly E. "Quantifying catchment scale soil variability in Marshall Gulch, Santa Catalina Mountains Critical Zone Observatory." Thesis, The University of Arizona, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1538334.
Повний текст джерелаThe quantification and prediction of soil properties is fundamental to further understanding the Critical Zone (CZ). In this study we aim to quantify and predict soil properties within a forested catchment, Marshall Gulch, AZ. Input layers of soil depth (modeled), slope, Saga wetness index, remotely sensed normalized difference vegetation index (NDVI) and national agriculture imagery program (NAIP) bands 3/2 were determined to account for 95% of landscape variance and used as model predictors. Target variables including soil depth (cm), carbon (kg/m2), clay (%), Na flux (kg/m 2), pH, and strain are predicted using multivariate linear step-wise regression models. Our results show strong correlations of soil properties with the drainage systems in the MG catchment. We observe deeper soils, higher clay content, higher carbon content, and more Na loss within the drainages of the catchment in contrast to the adjacent slopes and ridgelines.
Thomas, Roger E. "No-till seeding of improved forage species into established vegetative cover on reclaimed strip-mined, prime farmland." The Ohio State University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=osu1409834292.
Повний текст джерелаNavin, Michael Patrick. "Stability of Embankments Founded on Soft Soil Improved with Deep-Mixing-Method Columns." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/28654.
Повний текст джерелаPh. D.
Elzahabi, Malak. "The effect of soil pH on heavy metal transport in the vadose zone /." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=36804.
Повний текст джерелаIn the experimental part of this research, one dimensional solute and moisture flow (leaching) tests, using different heavy metal permeants, were conducted on an unsaturated illitic soil at varying pH values. Experimental results showed that the retention and migration of heavy metals are highly dependent on the soil pH, the presence of carbonates, the degree of saturation, the influent concentration and the time duration. At high soil pH and carbonate content, heavy metals were retained in the soils if the buffering capacity was high enough to resist the acidic input solution, and sorption processes will prevail in the carbonate phase. As the soil pH decreases, the dissolution of carbonates increases and cation exchange capacity becomes the more dominant process in heavy metals retention.
The numerical study developed a model to analyse and predict the transport of the contaminant in unsaturated clayey soils in which some of the species were adsorbed on clay particles surfaces. The proposed mathematical model was based on the postulates of irreversible thermodynamics and is also applicable in a one-dimensional case. In this model, various solute transport mechanisms such as diffusion and sorption were considered. Results indicated that the diffusion coefficient is necessary to provide a good agreement between the experimentally measured and the theoretically predicted values of contaminant transport through the soil. The numerical results of the coupled solute and moisture equations showed that the transport coefficients strongly and accurately depend on solute and volumetric content. (Abstract shortened by UMI.)
Joshi, Bhaskar. "Estimation of diffuse vadose zone soil-water flux in a semi-arid region." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq23996.pdf.
Повний текст джерелаKiome, Romano Mungiiria. "Soil and water conservation for improved soil moisture and crop production : an empirical and modelling study in semi-arid Kenya." Thesis, University of East Anglia, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317585.
Повний текст джерелаBarquin, Valle Luis Pablo. "Modeling shallow groundwater table contribution to soil water retention in the unsaturated zone of a calcareous soil of south Florida." [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0025060.
Повний текст джерелаHarris, Frances. "Nutrient dynamics of the farming system of the Kano close-settled zone Nigeria." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242994.
Повний текст джерелаMatzke, Jeffrey Alan. "Geophysical investigation of the stone zone and loamy mantle on the Iowan surface." Thesis, The University of Iowa, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1550914.
Повний текст джерелаThe processes that generated the distinctive landscape of the Iowa Erosion Surface (IES) of northeastern Iowa have been debated for over a century. A number of researchers have concluded that the IES experienced a periglacial environment and was underlain by continuous permafrost during the last glacial maximum. Ubiquitous throughout the IES is a stone zone that lies 60-100cm below the surface. Several explanations for the genesis of the stone zone have been proposed, including a lag concentrate, biomantle processes, and cryogenesis. We utilized a combination of coring and trenching, ground penetrating radar and resistivity to investigate the 3D distribution of the stone zone, overlying "pedisediment" and the underlying contact with dense till across a 100m2 area on a typical IES hillslope in east-central Iowa . Our preliminary results indicate that the stone zone occurs in the basal few decimeters of pedisediment that rests uncomformably and abruptly on eroded, dense till. Ice wedge casts extend from the stone zone into the underlying till. The depth of the stone zone below the modern surface increases downslope and the stone zone dissipates and eventually is replaced by relatively thick loamy sand beneath the footslope. These relationships argue against the stone zone being of biogenic origin. The occurrence of ice wedge casts associated with the stone zone and systematic changes in the thickness and texture of the pedisediment suggest to us that stone zone on the IES was formed by a combination of cryogenic and active zone erosive processes during the full glacial period.
TAKEDA, Yasuo, 泰雄 竹田, Jun KATAOKA, 順. 片岡, Osamu IIDA, 修. 飯田, Tanafumi TANAKA, and 隆文 田中. "Slope failure in the rectilinear zone of hillsides." 名古屋大学農学部付属演習林, 1987. http://hdl.handle.net/2237/8663.
Повний текст джерелаBattigelli, Jeffrey Paul. "Impact of soil compaction and organic matter removal on soil fauna in the sub-boreal spruce zone of central British Columbia." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0012/NQ59563.pdf.
Повний текст джерелаTomlinson, Harry M. Jr. "High pressure pressuremeter equipment modifications and software development for improved testing capabilities in Piedmont residual soils." Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/19968.
Повний текст джерелаThomson, Kirk Alan, and Kirk Alan Thomson. "VERTICAL DIFFUSION OF SELECTED VOLATILE ORGANIC CONTAMINANTS THROUGH UNSATURATED SOIL FROM A WATER TABLE AQUIFER; FIELD AND LABORATORY STUDIES." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/275331.
Повний текст джерела