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Dissertations / Theses on the topic 'Root Zone Soil Moisture'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 September 2023

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1

Erindi-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.

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This study investigated the possibility of three approaches in determination of soil moisture in the root zone. The aim of the study was to contribute to the development of soil moisture monitoring methods to better help crop best management practices.<br>Two 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.<br>The first experiment (at St. Jean-sur-Richelieu

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2

Omotere, 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/.

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Soil moisture information can be used accurately in determining the timing and amount of irrigation applied to plants. Pan and Pan et al. proposed a robust and simple daily diagnostic equation for estimating daily soil moisture. The diagnostic equation evaluates the relationship between the soil moisture loss function and the summation weighted average of precipitation. The loss function uses the sinusoidal wave function which employs day of the year (DOY) to evaluate the seasonal variation in soil moisture loss for a given year. This was incorporated into the daily diagnostic equation to esti

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3

Newill, 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.

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This research explores the use of insulated electrodes to determine electrical impedance distributions within soil cores. It is used to infer the effect of roots on soil moisture which, in turn, can provide knowledge relating to crop breeding programmes. These programmes are becoming increasingly important in order to address challenges posed by global population growth and climate change. Direct contact electrical impedance measurements in soil are frequently used but these are vulnerable to electrochemical effects and corrosion. Insulated electrodes are used in the present work to overcome t

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4

Snelson, Jonathan Bundy. "Plant Growth and Root Zone Management of Greenhouse Grown Succulents." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/32398.

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Effects of media, soil moisture, fertility rate, and plant growth regulators on plant growth were investigated for 13 taxa of succulents. Media: Liners were grown in five common greenhouse substrates: 80% peat, 60% bark + 30% peat moss, 80% pine bark/20% Permatil (v/v), 100% composted pine bark, or whole tree substrate until market ready. Overall, higher percentage bark mixes yielded smaller plants, with lower shoot dry weights, shoot heights and widths. Soil Moisture: Liners were potted into a 60% bark/30% peat soilless potting mix. In group 1 , irrigation to container capacity occurred

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5

Costa, Carlos Alexandre Gomes. "Soil moisture and water availability in the root zone under natural conditions of preserved Caatinga." Universidade Federal do CearÃ, 2012. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=8261.

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Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico<br>A Ãgua na bacia hidrogrÃfica estÃ distribuÃda em diversos compartimentos importantes no que se refere Ã ecohidrologia. Muitos estudos em regiÃes semiÃridas apontam os reservatÃrios superficiais como principais compartimentos de Ãgua. Entretanto, a bacia hidrogrÃfica tem maior abrangÃncia que as bacias hidrÃulicas nela contida, e os recursos hÃdricos nos compartimentos distribuÃdos na bacia hidrogrÃfica (como no solo) devem ser analisados nÃo somente no que se refere aos usos ecolÃgicos, mas tambÃm como espaÃo de disponibilidade h

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6

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.

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7

Goble, Peter. "Maximizing the utility of available root zone soil moisture data for drought monitoring purposes in the Upper Colorado River Basin and western High Plains, and assessing the interregional importance of root zone soil moisture on warm season water." Thesis, Colorado State University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10139009.

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<p> Root Zone Soil Moisture (RZSM) data have both drought monitoring and seasonal forecasting applications. It is the lifeblood of vegetation, an integral component of the hydrologic system, a determining factor in irrigation requirements, and works to govern the means by which energy imbalances are settled between land and atmosphere. The National Integrated Drought Information System (NIDIS) has worked in conjunction with the Colorado Climate Center to improve regional drought early warning through enhanced monitoring and understanding of RZSM. The chief goals of this research have been as f

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8

Cline, Nathan Lyle. "Wet-Thermal Time and Plant Available Water in the Seedbeds and Root Zones Across the Sagebrush Steppe Ecosystem of the Great Basin." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/4384.

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Following wildfires, plant materials are direct-seeded to limit erosion and annual weed invasion. Seedlings often fail to establish because selected plant materials are not always well adapted to local soil moisture and temperature conditions. In an effort to help improve plant materials selection and to evaluate sites potential revegetation, we have worked toward developing methodology to predict germination and root growth based on site specific soil moisture and temperature conditions. First, we characterized the seedbed environment of 24 sagebrush (Artemisia spp.) steppe sites throughout t

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9

Olivera, Guerra Luis Enrique. "Suivi des ressources en eau des cultures irriguées par télédétection multi-spectrales optique/thermique." Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30324.

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L'agriculture est une pression importante sur les ressources en eau, consommant plus de 70% de l'eau douce mobilisée à l'échelle mondiale. Cependant, les informations sur l'irrigation, pourtant cruciales pour assurer une durabilité de la ressource, sont souvent indisponibles. Par conséquent, il est essentiel d'estimer les différents termes du bilan d'eau des cultures à grande échelle. Cette thèse vise à intégrer les données de télédétection optique/thermique dans un modèle simplifié de bilan d'eau des cultures pour le suivi du bilan d'eau des zones agricoles irriguées. Une approche innovante e

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10

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.

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11

Dassanayake, Kithsiri Bandara. "Differential responses of perennial root systems to change in soil moisture." Thesis, University of Aberdeen, 1996. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU089928.

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There is evidence in the literature that drought avoidance/tolerance in many annual crop plants is associated with root system characteristics. However, investigations on the morphological traits associated with drought resistance of tree crops is very limited. Identification of such traits would be useful in screening genotypes for drought tolerance. To assess the impact of environmental conditions on plant behaviour requires a carefully defined test environment, a procedure for monitoring changes in the environment and the testing of the test environment for reliability. The filter paper pro

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12

Bellett-Travers, David Marcus. "Water relations and soil moisture requirements of transplanted amenity trees during establishment." Thesis, University of Hertfordshire, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251544.

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13

Lan, Chinchun. "Analysis of soil-root interaction." Connect to resource, 1985. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1119365654.

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14

Evans, Douglas. "Soil water regime, root water extraction and the growth of fine roots of Sitka Spruce." Thesis, University of Aberdeen, 1988. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU020973.

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The effect of removing soil water stress on fine root growth and the pattern of water use was studied by irrigating a small plot (20 m x 20 m) of 40 year old Sitka spruce. A control plot was established close by. Soil water content and soil matric potential were measured independently on both plots at several depths. Root growth was measured using monthly coring for the surface horizons (c. 10 cm depth) and ingrowth cores to study rooting at depth. In the absence of irrigation the 2 plots had similar water regimes. The irrigation kept matric potential > 20 kPa and water content > 20%. Areas be

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15

Rahgozar, Mandana Seyed. "Estimation of evapotranspiration using continuous soil moisture measurement." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001812.

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16

Pijl, Isabelle. "Drip fertigation : effects on water movement, soil characteristics and root distribution." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52245.

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Thesis (MScAgric)--University of Stellenbosch, 2001.<br>ENGLISH ABSTRACT: The application of water and nutrients via a drip irrigation system influences the water distribution in the soil, soil characteristics and root distribution beneath the dripper. To determine the water distribution pattern beneath a dripper in sandy soil, EnviroSCAN (Sentek) capacitance probes were installed directly below the dripper and at distances of 20, 40 and 60 cm from the dripper. The continuous monitoring of the soil water content (SWC) beneath the dripper provided a good indication of how the water applie

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17

Lynch, Derek H. (Derek Henry). "Low root-zone temperatures and soybean (Glycine max (L.) Merr.) N2- fixing symbiosis development." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=56677.

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This research tested the hypotheses that (a) suboptimal root-zone temperatures (RZT) limit the soybean-Bradyrhizobium N$ sb2$-fixing symbiosis primarily through an inhibition of symbiosis establishment and (b) this inhibition is modified by the genotype of micro- or macrosymbiont. Controlled environment and field experiments were conducted utilizing two soybean genotypes and six B. japonicum strains. At 19$ sp circ$C RZT fixed nitrogen levels decreased by 30-40%, predominantly due to a restriction in the latter stages of nodule development. Reductions of 10% and 30% in specific nodule activity

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18

Li, Liqing. "Water saturation and air/water interfacial area measurements by partitioning gas tracers in the vadose zone and landfills." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 176 p, 2008. http://proquest.umi.com/pqdweb?did=1464133931&sid=30&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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19

Kingsley-Richards, Sarah. "Influence of Plant Age, Soil Moisture, and Temperature Cylcing Date on Containter-Grown Herbaceous Perennials." ScholarWorks @ UVM, 2011. http://scholarworks.uvm.edu/graddis/122.

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Perennial growers overwintering plant stock require information to assist in deciding which containerized plants are most likely to successfully overwinter. Three studies on container-grown herbaceous perennials were conducted to examine the influence of plant age, soil moisture, and temperature cycling date on cold hardiness. In January, plants were exposed to controlled freezing temperatures of -2, -5, -8, -11, and -14C and then returned to a 3-5C greenhouse. In June, plants were assessed using a visual rating scale of 1-5 (1 = dead, 3-5 = increasing salable quality, varying by cultiva

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20

Forrer, Irène Elisabeth. "Solute transport in an unsaturated field soil visualization and quantification of flow patterns using image analysis /." Zurich : Swiss Federal Institute of Technology Zurich, 1997. http://bibpurl.oclc.org/web/31190.

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21

Thosago, Setshele Standford. "Response of selected cowpea lines to low soil phosphorus and moisture stress conditions at Ukulima Farm in Limpopo Province." Thesis, University of Limpopo, 2015. http://hdl.handle.net/10386/1585.

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Thesis (M. Sc.(Agronomy)) -- University of Limpopo, 2015<br>Cowpea (Vigna unguiculata L. Walp) is an important grain legume grown in many parts of the world mostly by smallholder (SH) farmers. Low soil phosphorus (P) and drought stress are major constraints to legume production and threaten food security. Root architecture is a spatial configuration of the root system which is influenced by moisture status and P uptake. A field experiment was conducted at Ukulima farm near Modimolle in Waterberg district during 2012/13 summer growing season. The treatments comprised of two levels each fo

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22

Elmore, Whitney. "Field and Laboratory Studies on the Development and Control of Soil Water Repellency of Sand Root Zone Mixes." TopSCHOLAR®, 2001. http://digitalcommons.wku.edu/theses/655.

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Localized dry spots (LDS) associated with water repellent (i.e., hydrophobic) soils have detrimental effects on the survival, playability, and aesthetic value of creeping bentgrass (Agrostis palustris) used for golf course putting greens. The development of water-repellent soils, using molarity of ethanol water droplet tests to determine soil hydrophobicity, wetting agent evaluations, and water retention based on percent organic matter were investigated. Greenhouse, field, and laboratory studies were conducted at Western Kentucky University beginning in 2000 and ending in 2001. The greenhouse

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23

Lee, Hock Seng, and n/a. "An ODE/MOL PDE Template For Soil Physics: A Numerical Study." Griffith University. Australian School of Environmental Studies, 2003. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20030616.142709.

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The aim of the thesis is to find a method, in conjunction with the ordinary differential equation (ODE) based method of lines (MOL) solution of Richards equation, to model the steep wetting front infiltration in very dry soils, accurately and efficiently. Due to the steep pressure head or steep water volumetric content gradients, highly nonlinear soil hydraulic properties and the rapid movement of the wetting front, accurate solutions for infiltration into a dry soil are usually difficult to obtain. Additionally, such problems often require very small time steps and large computation times. A

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24

Kuhlmann, Anna [Verfasser], and Insa [Akademischer Betreuer] Neuweiler. "Influence of soil structure and root water uptake on flow in the unsaturated zone / Anna Kuhlmann. Betreuer: Insa Neuweiler." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2012. http://d-nb.info/1022379186/34.

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25

Morgenroth, Justin. "The Effect of Porous Concrete Paving on Underlying Soil Conditions and Growth of Platanus orientalis." Thesis, University of Canterbury. School of Forestry, 2010. http://hdl.handle.net/10092/5112.

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Urbanisation is characterised by mass migration of people to urban areas and conversion of land from rural to urban land uses. Changes in population dynamics have led to half the world’s population living in urban areas; in developed countries, urban dwellers account for three-quarters of the total population. Though populations have shifted from rural to urban areas, people continue to rely on their environment, and trees in particular, for tangible and intangible benefits alike. A great deal of factual and anecdotal knowledge supports the role of trees for ecological, social, and economic

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26

Knighton, Leah Nicole. "Hydrologic and Biologic Responses of Anthropogenically Altered Lentic Springs to Restoration in the Great Basin." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/8578.

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Water is a limited and highly valued resource in the semi-arid Great Basin. Surface water sources are often small and widely spaced apart, comprising only 1-3% of the surface area of the overall landscape. Despite their small size, these springs and surrounding wet meadows have a substantial effect on the surrounding environment. Springs provide drinking water, forage and cover for livestock and wildlife, habitat for diversity of plant species and a resource for human-related activities. In recent years, many of these springs have become dewatered due to diversions of groundwater for municipal

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27

Lloyd, Davidson A. "Effects of rhizosphere priming and microbial functions on soil carbon turnover." Thesis, Cranfield University, 2015. http://dspace.lib.cranfield.ac.uk/handle/1826/9278.

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A major uncertainty in soil carbon studies is how inputs of fresh plant-derived carbon affect the turnover of existing soil organic matter (SOM) by so-called priming effects. Priming may occur directly as a result of nutrient mining by existing microbial communities, or indirectly via microbial population adjustments. Soil type and conditions may also influence the intensity and direction of priming effects. However the mechanisms are poorly understood. The objectives of this study were (1) to investigate how additions of labile C4 substrate affected SOM turnover in two contrasting unplanted C

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Brunke, Michael A., Patrick Broxton, Jon Pelletier, et al. "Implementing and Evaluating Variable Soil Thickness in the Community Land Model, Version 4.5 (CLM4.5)." AMER METEOROLOGICAL SOC, 2016. http://hdl.handle.net/10150/612995.

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One of the recognized weaknesses of land surface models as used in weather and climate models is the assumption of constant soil thickness because of the lack of global estimates of bedrock depth. Using a 30-arc-s global dataset for the thickness of relatively porous, unconsolidated sediments over bedrock, spatial variation in soil thickness is included here in version 4.5 of the Community Land Model (CLM4.5). The number of soil layers for each grid cell is determined from the average soil depth for each 0.9 degrees latitude x 1.25 degrees longitude grid cell. The greatest changes in the simul

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29

Perez, Luis G. "Development of a Methodology that Couples Satellite Remote Sensing Measurements to Spatial-Temporal Distribution of Soil Moisture in the Vadose Zone of the Everglades National Park." FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1663.

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Spatial-temporal distribution of soil moisture in the vadose zone is an important aspect of the hydrological cycle that plays a fundamental role in water resources management, including modeling of water flow and mass transport. The vadose zone is a critical transfer and storage compartment, which controls the partitioning of energy and mass linked to surface runoff, evapotranspiration and infiltration. This dissertation focuses on integrating hydraulic characterization methods with remote sensing technologies to estimate the soil moisture distribution by modeling the spatial coverage of soil

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30

Sun, Hongwei. "The effect of seaweed concentrate on turfgrass growth, nematode tolerance and protein synthesis under moisture stress conditions." Diss., This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-06062008-163430/.

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31

Klinka, Karel, Pal Varga, and Christine Chourmouzis. "Towards a quantitative classification of soil nutrient regimes in British Columbia : comparison of regional studies." Forest Sciences Department, University of British Columbia, 1999. http://hdl.handle.net/2429/764.

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The three major components in the site classification of the biogeoclimatic ecosystem classification system are: climatic regimes, soil moisture regimes (SMRs) and soil nutrient regimes (SNRs). Both SMRs and SNRs can be identified in the field using soil characteristics and indicator plants. In the case of SMRs a quantitative classification was also developed that allow comparison of SMRs in different subzones. However, similar quantitative classification has not yet been developed for SNRs. This pamphlet summarizes and compares the results of several regional studies conducted in different

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32

Vanella, Daniela. "Monitoring and modeling fluxes transfer processes in soil-plant-atmosphere continuum across scales." Doctoral thesis, Università di Catania, 2017. http://hdl.handle.net/10761/4084.

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Alle interazioni tra le diverse componenti del sistema suolo-pianta-atmosfera (SPA) è attribuito un ruolo critico nel ciclo idrologico e della biosfera terrestre. La comunità scientifica specializzata è sempre più consapevole della necessità di portare avanti studi a carattere interdisciplinare per la comprensione delle interazioni funzionali tra le risorse naturali ed i relativi problemi di sostenibilità del sistema SPA. All interno di tali studi interdisciplinari, l analisi delle interazioni suolo-radice risulta rilevante anche per la gestione ottimale dell'irrigazione, in particolare nell

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33

Falkenberg, Nyland Ray. "Remote sensing for site-specific management of biotic and abiotic stress in cotton." Thesis, Texas A&M University, 2004. http://hdl.handle.net/1969.1/478.

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This study evaluated the applicability of remote sensing instrumentation for site- specific management of abiotic and biotic stress on cotton grown under a center pivot. Three different irrigation regimes (100%, 75%, and 50% ETc) were imposed on a cotton field to 1) monitor canopy temperatures of cotton with infrared thermometers (IRTs) in order to pinpoint areas of biotic and abiotic stress, 2) compare aerial infrared photography to IRTs mounted on center pivots to correlate areas of biotic and abiotic stress, and 3) relate yield to canopy temperatures. Pivot-mounted IRTs and IR camera

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34

Szota, Christopher. "Root morphology, photosynthesis, water relations and development of jarrah (Eucalyptus marginata) in response to soil constraints at restores bauxite mines in south-western Australia." University of Western Australia. School of Plant Biology, 2009. http://theses.library.uwa.edu.au/adt-WU2010.0058.

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Bauxite mining is a major activity in the jarrah (Eucalyptus marginata Donn ex Sm.) forest of south-western Australia. After mining, poor tree growth can occur in some areas. This thesis aimed to determine whether soil constraints, including reduced depth and compaction, were responsible for poor tree growth at low-quality restored bauxite mines. In particular, this study determined the response of jarrah root morphology, leaf-scale physiology and growth/development to soil constraints at two contrasting (low-quality and high-quality) restored bauxite-mine sites. Jarrah root excavations at a l

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35

Shamambo, Daniel Chiyeka. "Assimilation de données satellitaires pour le suivi des ressources en eau dans la zone Euro-Méditerranée." Thesis, Toulouse 3, 2020. http://www.theses.fr/2020TOU30143.

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Une estimation plus précise de l'état des variables des surfaces terrestres est requise afin d'améliorer notre capacité à comprendre, suivre et prévoir le cycle hydrologique terrestre dans diverses régions du monde. En particulier, les zones méditerranéennes sont souvent caractérisées par un déficit en eau du sol affectant la croissance de la végétation. Les dernières simulations du GIEC (Groupe d'Experts Intergouvernemental sur l'Evolution du Climat) indiquent qu'une augmentation de la fréquence des sécheresses et des vagues de chaleur dans la région Euro-Méditerranée est probable. Il est don

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Goktas, Recep Kaya. "Contaminant fate and transport analysis in soil-plant systems." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39472.

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The main objective of this study is to develop a modeling methodology that facilitates incorporating the plant pathway into environmental contamination models recognizing the fact that plants are dynamic entities that regulate their life cycle according to natural and anthropogenic environmental conditions. A modeling framework that incorporates the plant pathway into an integrated water flow and contaminant transport model in terrestrial systems is developed. The modeling framework is aimed to provide a tool to analyze the plant pathway of exposure to contaminants. The model developed using

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37

Akgul, Alper. "Performance of slash pine (Pinus elliottii Engelm.) containerized rooted cuttings and bare-root seedlings established on five planting dates in the flatlands of western Louisiana." Diss., Texas A&M University, 2003. http://hdl.handle.net/1969.1/2230.

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The forest product industry is keenly interested in extending the normal planting season, as well as in the comparative field performance of standard nursery bare-root seedlings and containerized rooted cuttings. The effect of seasonal planting dates on survival, above and belowground biomass allocation, water relations, gas exchange attributes and foliar carbon isotope composition (δ13C) of two stock types of slash pine (Pinus elliottii Engelm.) were examined. Slash pine bare-root seedlings (BRS) and containerized rooted cuttings (CRC) were hand planted in September, November, January, March

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38

Lightle, Nicole E. "Effects of Air vs. Air+Soil Heating During a Simulated Heat Wave on White Oak (Quercus alba) and Black Oak (Quercus velutina)." University of Toledo / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1365159241.

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Juhász, Carlos Eduardo Pinto. "Relação solo-água-vegetação em uma toposseqüência localizada na Estação Ecológica de Assis, SP." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/11/11140/tde-17042006-163701/.

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O bioma Cerrado está cada vez mais fragmentado devido à ocupação agrícola e antrópica. Para a manutenção da biodiversidade, corredores de vegetação devem ser criados com o auxílio da revegetação e recuperação de áreas degradadas. Isto é facilitado pelo conhecimento da distribuição e dinâmica natural dos solos. O objetivo deste trabalho foi caracterizar o funcionamento físico-hídrico dos solos distribuídos em uma toposseqüência sob vegetação nativa. A área de estudo foi localizada dentro de uma parcela permanente instalada na Estação Ecológica de Assis, SP, Brasil, com vegetação predominante de

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40

Said, Ahmed Hami. "Etude de l’alimentation hydrique du palmier dattier (Phoenix dactylifera L.) dans le contexte pédoclimatique de la zone littorale de la République de Djibouti." Thesis, Orléans, 2015. http://www.theses.fr/2015ORLE2034/document.

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Le palmier-dattier constitue une des rares cultures à vocation alimentaire adaptées aux conditions climatiques extrêmes (sécheresse, salinité), telles que rencontrées à Djibouti. Dans un contexte de ressources en eau fortement limitées, la connaissance des modalités de l’alimentation hydrique du palmier dattier est essentielle. L’objectif de ce travail de recherche est d’acquérir cette connaissance, dans le contexte pédoclimatique de Djibouti, par la réalisation d’un suivi in situ du fonctionnement hydrique du système sol-palmier, à l’échelle d’un individu, et la quantification du puits racina

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De, Parseval Henri. "Stratégies d'exploration racinaire et cycles des nutriments : Étude du rôle fonctionnel de l'exploration horizontale du sol par les plantes." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066628/document.

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La nutrition minérale des plantes dépend à la fois du développement et du fonctionnement de leur appareil racinaire, incluant l'absorption mais aussi la capacité des plantes à influencer les cycles des nutriments, notamment par l'exsudation. Le but de cette thèse est de lier les rétroactions plantes-sol impliquant les cycles des nutriments aux stratégies d'exploration racinaire. Dans la revue bibliographique, je recense des mécanismes d'interaction plantes-sol et leurs échelles spatiales et temporelles. En considérant, à l'échelle de la rhizosphère, les interactions directes entre racines et s

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Pellegrini, André. "Sistemas de cultivo da cultura do fumo com ênfase às práticas de manejo e conservação do solo." Universidade Federal de Santa Maria, 2006. http://repositorio.ufsm.br/handle/1/5513.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Soil management systems with minimum tillage and mulch are predominant in agriculture of Southern of Brazil. No-tillage for tobacco crop is not common and restricted to isolated places and only for some farmers that, through empiric tests and adaptation of equipments, search for soil preservation and increased yield. The objective of this work was study the main soil management systems for tobacco crop and possibilities of changing the traditional system of tobacco cropping, with emphasis on practices of soil management and conserv

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Gherardi, Mark James. "Availability and management of manganese and water in bauxite residue revegetation." University of Western Australia. Soil Science and Plant Nutrition Discipline Group, 2004. http://theses.library.uwa.edu.au/adt-WU2005.0038.

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[Truncated abstract] Industrial processing to refine alumina from bauxite ore produces millions of tonnes of refining residue each year in Australia. Revegetation of bauxite residue sand (BRS) is problematic for a number of reasons. Harsh chemical conditions caused by residual NaOH from ore digestion mean plants must overcome extremely high pH (initially >12), saline and sodic conditions. At such high pH, manganese (Mn) is rapidly oxidised from Mn2+ to Mn4+. Plants can take up only Mn2+. Thus, Mn deficiency is common in plants used for direct BRS revegetation, and broadcast Mn fertilisers ha

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HO, SHIH-SHEN, and 何信賢. "Model on soil moisture movement of unsaturated condition in root zone." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/07701145525696416672.

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"Field-scale root-zone soil moisture : spatio-temporal variability and mean estimation." Thesis, 2015. http://hdl.handle.net/10388/ETD-2015-12-2397.

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This thesis is focused around improving soil moisture estimates of spatial variability and mean at the field scale, which are useful for many different applications. The objectives were: (1) examine soil moisture spatial patterns and variability within field scale, and (2) compare field-scale soil moisture determination methods. An observational study was conducted, in which soil moisture was monitored over a 500 m by 500 m area during two and a half growing seasons at a prairie pasture in central Saskatchewan. Analysis of the spatial patterns of root-zone soil moisture revealed two distinc

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Sreelash, K. "Estimation of Root Zone Soil Hydraulic Properties by Inversion of a Crop Model using Ground or Microwave Remote Sensing Observations." Thesis, 2014. http://etd.iisc.ac.in/handle/2005/3081.

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Good estimates of soil hydraulic parameters and their distribution in a catchment is essential for crop and hydrological models. Measurements of soil properties by experimental methods are expensive and often time consuming, and in order to account for spatial variability of these parameters in the catchment, it becomes necessary to conduct large number of measurements. Estimation of soil parameters by inverse modelling using observations on either surface soil moisture or crop variables has been successfully attempted in many studies, but difficulties to estimate root zone properties arise fo

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Sreelash, K. "Estimation of Root Zone Soil Hydraulic Properties by Inversion of a Crop Model using Ground or Microwave Remote Sensing Observations." Thesis, 2014. http://hdl.handle.net/2005/3081.

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Good estimates of soil hydraulic parameters and their distribution in a catchment is essential for crop and hydrological models. Measurements of soil properties by experimental methods are expensive and often time consuming, and in order to account for spatial variability of these parameters in the catchment, it becomes necessary to conduct large number of measurements. Estimation of soil parameters by inverse modelling using observations on either surface soil moisture or crop variables has been successfully attempted in many studies, but difficulties to estimate root zone properties arise fo

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(7481798), Iman Haqiqi. "IRRIGATION, ADAPTATION, AND WATER SCARCITY." Thesis, 2019.

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<p>Economics is about the management of scare resources. In agricultural production, water stress and excess heat are the main constraints. The three essays of this dissertation try to improve our understandings of how climate and water resources interact with agricultural markets, and how global changes in agricultural markets may affect water resources. I construct empirical and simulation models to explain the interplay between agriculture and water. These models integrate economic theories with environmental sciences to analyze the hydroclimatic and economic information at different geospa

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Kanarek, Michael Richard. "Understanding the effects of wildfire on soil moisture dynamics." 2013. http://hdl.handle.net/2152/21841.

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Moisture dynamics in the critical zone have significant implications for a variety of hydrologic processes, from water availability to plants, to infiltration and groundwater recharge rates. These processes are perturbed by events such as wildfires, which may have long-lasting impacts. In September 2011, the most destructive wildfire in Texas history occurred in and around Bastrop State Park, which was significantly affected; thus this is a rare opportunity to study soil moisture under such burned conditions. A 165 m long transect, bridging burned and unburned areas, was established within the

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Steelman, Colby Michael. "Evaluating Vadose Zone Moisture Dynamics using Ground-Penetrating Radar." Thesis, 2012. http://hdl.handle.net/10012/6576.

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Near-surface sediments in the vadose zone play a fundamental role in the hydrologic system. The shallow vadose zone can act as a buffer to delay or attenuate surface contaminants before they reach the water table. It also acts as a temporary soil moisture reservoir for plant and atmospheric uptake, and regulates the seasonal groundwater recharge process. Over the past few decades, geophysical methods have received unprecedented attention as an effective vadose zone characterization tool offering a range of non-invasive to minimally invasive techniques with the capacity to provide detailed soil

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