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Dissertations / Theses on the topic 'Urea in soils'

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Published: 4 June 2021

Last updated: 12 February 2022

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1

Ali, Abdul-Mehdi Saleh. "Reactions of urea phosphate in calcareous and alkaline soils: Ammonia volatilization and effects on soil sodium and salinity." Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184694.

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Nitrogen (N) loss in the form of volatilized ammonia (NH₃) is a considerable problem when ammonium (NH₄⁺) forming fertilizers are applied to calcareous or alkaline soils. Large areas of agricultural land, contain alkalinity and salinity problems, are potentially suitable for crop production with little alteration. This study was conducted to determine and compare the effectiveness of urea phosphate (UP) in reducing soil alkalinity and NH₃ loss. The volatilization of NH₃ from UP and urea (U) was studied on 3 selected soils (Hayhook SL, Laveen L and Latene L) using an aeration system. Urea phosp

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2

Meier, Jackie N. "Effects of lignosulfonate in combination with urea on soil carbon and nitrogen dynamics." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=56658.

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Lignosulfonate (LS), a by-product of the pulp and paper industry, may have the potential to increase fertilizer N availability by acting as a urease and nitrification inhibitor. Four consecutive laboratory studies were conducted to evaluate the behavior of LS in agricultural soils. The effects of various types and rates of LS on soil respiration and soil N dynamics were determined. Effects of LS in combination with fertilizers on microbial activity and N dynamics were measured. Due to the high water solubility of LS a leaching column study was conducted to determine the potential leaching of L

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3

Huang, Yuh-Ming. "The effects of precipitation of calcium carbonate on soil pH following urea application." Thesis, University of Oxford, 1990. https://ora.ox.ac.uk/objects/uuid:a81844cb-c0c1-4dd3-a3c5-fc7a1b716021.

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This thesis describes a series of experiments both in solution systems and soil systems to study the precipitation of calcium carbonate in soils and the effects of the precipitation on soil pH after urea had been applied. (1) A gas bubbling system has been established which introduces ammonia at a steady rate to the reaction solution and keeps it equilibrated at 0.00484 atm partial pressure of carbon dioxide. (2) In a non-seeded system, the effects of calcium, urea, Mg (magnesium), P (phosphate), and DOC (water-dissolved organic matter) on the precipitation were examined individually and in va

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4

Schindler, Frank Vincent. "Redistribution and fate of applied ??N-enriched urea under irrigated continuous corn production." Thesis, North Dakota State University, 1996. https://hdl.handle.net/10365/28973.

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Understanding the redistribution and fate of N is essential for justification of Best Management Practices (BMP). This project was conducted on a Hecla fine sandy loam (sandy, mixed, Aquic Haploboroll) soil at the BMP field site near Oakes, North Dakota. One objective of this investigation was to evaluate the residence times of N03- -N in 20 undisturbed lysimeters and its infiltration time through the soil profile to tile drains. Corn (Zea mays L.) was fertilized with 135 kg N ha -1 as ??N-enriched urea plus 13.5 and 48.1 kg N ha -1 preplant for 1993 and 1994, respectively. Urea-N was band app

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5

Yusran, Fadly Hairannoor. "Triple superphosphate and urea effects on availability of nutrients in the fertilizer band for soybean (Glycine max L.) growth with emphasis on molybdenum." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=69710.

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Fertilizer applications of urea and triple superphosphate (TSP) may affect availability of plant nutrients in the soil through alteration of soil pH and sorption-displacement effects. The objectives of this experiment were to evaluate urea and TSP effects on nutrient availability to soybean (Glycine max L.). Field experiments were carried out on three Quebec soils; a Chicot sandy clay loam (Gleyed Melanic Brunisol), an Ormstown silty clay loam (Luvic Gleysol) and a Ste. Rosalie clay (Humic Gleysol). Three levels of TSP (0, 40, 80 kg $ rm P sb2O sb5 ha sp{-1}),$ and three levels of urea (0, 25,

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6

Noellsch, Adam J. "Optimizing crop N use efficiency using polymer-coated urea and other N fertilizer sources across landscapes with claypan soils." Diss., Columbia, Mo. : University of Missouri-Columbia, 2008. http://hdl.handle.net/10355/5643.

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Thesis (M.S.)--University of Missouri-Columbia, 2008.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on September 12, 2008) Includes bibliographical references.

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7

Ouyang, Duosheng. "New fertilizer combinations for improved nitrogen and phosphorus use efficiency and reduced environmental damage in corn production." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0004/NQ30353.pdf.

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8

Stark, Christine. "Effects of long- and short-term crop management on soil biological properties and nitrogen dynamics." Phd thesis, Lincoln University. Agriculture and Life Sciences Division, 2005. http://theses.lincoln.ac.nz/public/adt-NZLIU20070220.010748/.

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To date, there has been little research into the role of microbial community structure in the functioning of the soil ecosystem and on the links between microbial biomass size, microbial activity and key soil processes that drive nutrient availability. The maintenance of structural and functional diversity of the soil microbial community is essential to ensure the sustainability of agricultural production systems. Soils of the same type with similar fertility that had been under long-term organic and conventional crop management in Canterbury, New Zealand, were selected to investigate relation

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9

Condron, Leo M. "Chemical nature and plant availability of phosphorus present in soils under long-term fertilised irrigated pastures in Canterbury, New Zealand." Lincoln College, University of Canterbury, 1986. http://hdl.handle.net/10182/1875.

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Soil P fractionation was used to examine changes in soil inorganic and organic P under grazed irrigated pasture in a long-term field trial at Winchmore in Mid-Canterbury. The soil P fractionation scheme used involved sequential extractions of soil with O.5M NaHCO₃ @ pH 8.5 (NaHCO₃ P), 0.1M NaOH (NaOH I P), 1M HCl (HCl P) and 0.1M NaOH (NaOH II P). The Winchmore trial comprised 5 treatments: control (no P since 1952), 376R (376 kg superphosphate ha⁻¹ yr⁻¹ 1952-1957, none since), 564R (564 kg superphosphate ha⁻¹ yr⁻¹ 1952-1957, none since) 188PA (188 kg superphosphate ha⁻¹ yr⁻¹ since 1952) and 3

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10

Hulm, Sharon C. "Fertilizer nitrogen transformations following urea application to an afforested ecosystem." Thesis, University of Aberdeen, 1987. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU010535.

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Fertilizer nitrogen transformations in two Sitka spruce stands in northeast Scotland were studied using 15N-labelled (2.5 atom % 15N) urea at a rate equivalent to 160 kg N ha-1. The use of urea fertilizer resulted in accelerated growth of the tree crowns, and higher concentrations of total N in foliage, twigs and new wood. There was no fertilizer effect observed for bark. Despite a positive growth response by the trees to fertilizer N, only an estimated 17% of applied-N was utilized by the tree biomass. Application of urea-N resulted in a reduction in the leaching of inorganic N and certain ca

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11

Burns, Lisa C. "Cycling of fertiliser-derived N in a Sitka spruce ecosystem after 15N-urea application." Thesis, University of Aberdeen, 1992. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU545404.

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Low recovery rates of fertiliser N in tree biomass are frequently reported due to the inefficiency of N fertilisers in afforested ecosystems. At Culloden (North East Scotland), only 13&'37 of 15N-urea fertiliser applied to Sitka spruce could be recovered in the above-ground tree biomass two years after fertilisation. Fertiliser N not taken up by trees was largely 'locked-up' in stable organic forms of N within the LFH layers of the soil profile. 15N-labelled litter was used in both field and microcosm experiments, the release and fate of litter-derived-N (LDN) being traced over the course of t

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12

Cahill, Sheri Ms. "Nitrogen Use Efficiency and Yield Effects of Urea Formaldehyde Polymer (UFP) Fertilizer in Winter Wheat and Maize." NCSU, 2006. http://www.lib.ncsu.edu/theses/available/etd-10092006-092341/.

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The potential for improved fertilizer nitrogen (N) use efficiency (NUE) and yield in winter wheat (Triticum aestivum L.) and maize (Zea mays L.) was tested using a new, controlled release urea formaldehyde polymer (UFP). This polymer was compared with conventional aqueous urea-ammonium nitrate (UAN) [(NH2)2CO?NH4NO3] fertilizer during a two-year field experiment in North Carolina from 2004 to 2006. The crops were grown on three soils: Candor (sandy, siliceous, thermic Grossarenic Kandiudult), Portsmouth (fine-loamy over sandy or sandy-skeletal, mixed, semiactive, thermic Typic Umbraquult) and

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13

Stroehlein, J. L., I. G. Rubeiz, and N. F. Oebker. "Urea Phosphate Applied by Subsurface Drip Irrigation Increases Availability of Soil Nitrogen and Phosphorus." College of Agriculture, University of Arizona (Tucson, AZ), 1986. http://hdl.handle.net/10150/214135.

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Application of water and fertilizer through buried drip lines shows promise for vegetable production in Arizona. Use of an acidic product is necessary if phosphorus is added through the system. Urea phosphate was shown to be a satisfactory product for injecting into buried drip lines for squash and cabbage.

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14

Potthast, Karin. "Implications of land-use change and pasture management on soil microbial function and structure in the mountain rainforest region of southern Ecuador." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-115503.

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In the present thesis, implications of pasture establishment, fertilization and abandonment on soil C and nutrient dynamics were investigated for the mountain rainforest region of southern Ecuador. Over the past decades the natural forest of the study area has been threatened by conversion to cattle pastures. However, the soil fertility of these extensively grazed pastures (active pastures) declines continuously during pasture use. The invasion of bracken fern (Pteridium arachnoideum) leads to pasture abandonment when bracken becomes dominant. In order to reveal the mechanisms behind the deter

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15

Heaney, Danial John. "Products of urea hydrolysis in soil alter the solubility, plant uptake, and transport of elements." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ60295.pdf.

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16

Sunderlage, Brent. "LATE APPLICATION NITROGEN ON CORN IN SOUTHERN ILLINOIS AND SOIL PROPERTIES AFFECTING AMMONIA VOLATILIZATION FROM UREA FERTILIZER." OpenSIUC, 2017. https://opensiuc.lib.siu.edu/theses/2154.

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AN ABSTRACT OF THE THESIS OF BRENT C. SUNDERLAGE, for the Master of Science degree in Plant, Soil, and Agricultural Systems, presented on March 8, 2017, at Southern Illinois University Carbondale. TITLE: LATE APPLICATION NITROGEN ON CORN IN SOUTHERN ILLINOIS AND SOIL PROPERTIES AFFECTING AMMONIA VOLATILIZATION FROM UREA FERTILIZER MAJOR PROFESSOR: Dr. Rachel L. Cook In corn (Zea mays L.) production systems, typical nitrogen fertilization occurs either before planting or after crop emergence, as late as the V6 stage. Since the majority of nitrogen uptake does not occur until V10 through R1,

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17

Malavade, Sharad Suryakant. "Assessment of Soil Transmitted Helminth Infection (STHI) in School Children, Risk Factors, Interactions and Environmental Control in El Salvador." Scholar Commons, 2015. https://scholarcommons.usf.edu/etd/5734.

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Background: Soil transmitted helminth infections (STHI) are important Neglected Tropical Diseases (NTD). The three main STHI are infections with Ascaris lumbricoides, Trichuris trichiura and hookworms. STHI have a significant effect on the growth and development of children. A national survey for STHI in El Salvador by Pan American Health Organization and Ministry of Health in 2012 in school children aged 8years to 10 years. The survey collected data on age, gender, behavioral habits, and source of drinking water, type of toilet facility used and ecological zone of residence. A) We did an anal

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18

Koivunen, Marja Elina. "Degradation of methylene urea in soil and its use as a slow-release nitrogen fertilizer for processing tomato /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2002. http://uclibs.org/PID/11984.

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19

Balieiro, Neto Geraldo. "Nitrogênio com ou sem calcário superficial para recuperação do capim-marandu /." Jaboticabal : [s.n.], 2007. http://hdl.handle.net/11449/104949.

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Resumo: A degradação de cerca de 60 milhões de hectares de pastagens no Brasil afeta diretamente o estado nutricional dos rebanhos, conduzindo os pecuaristas a abrirem novas áreas de floresta, resultando em grave impacto de ordem econômica e ambienta!. A recuperação direta por meio da reposição dos nutrientes extraídos do solo ao longo dos anos representa menor risco ao produtor e reais possibilidades de adoção pela maior parte dos pecuaristas. Com este trabalho, objetivou-se avaliar os efeitos de nitrogênio (O, 100, 200, 300 e 400 kg/halano) com ou sem aplicação superficial de calcário nos at

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20

Campos, Odirley Rodrigues. "Liberação de nitrogênio da ureia com diferentes revestimentos." Universidade Federal de Viçosa, 2013. http://locus.ufv.br/handle/123456789/5512.

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Made available in DSpace on 2015-03-26T13:53:30Z (GMT). No. of bitstreams: 1 texto completo.pdf: 1611845 bytes, checksum: 13778a12240f86c322ed572b020bad22 (MD5) Previous issue date: 2013-03-07<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>Urea is the most widely used nitrogen fertilizer in agriculture and its rapid hydrolysis in the soil can lead to significant losses by ammonia volatilization (N-NH3(g)) or by nitrate leaching (N-NO3 -). In order to reduce N losses emerged in the market several products represented by the slow or controlled release fertilizers and stabi

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21

Diehl, Joelene M. Whalen Stephen Charles. "The effect of urea-ammonium-nitrate fertilizer amended with urease and nitrification inhibitors on nitrogen cycling in highly organic agricultural soil." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2007. http://dc.lib.unc.edu/u?/etd,1346.

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Thesis (M.S.)--University of North Carolina at Chapel Hill, 2007.<br>Title from electronic title page (viewed Apr. 25, 2008). "... in partial fulfillment of the requirements for the degree of Master of Science in the Department of Environmental Science and Engineering." Discipline: Environmental Sciences and Engineering; Department/School: Public Health.

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22

Whitaker, Justin. "Assessing Recombinant Expression of Urease Enzyme from Sporosarcina ureae as a Carbonatogenic Method for Strength Enhancement of Loose, Sandy Soils." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/35228.

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Les sols qui ne rencontrent pas les normes d’ingénierie civile doivent êtres soumis à des améliorations géotechniques car les vibrations causées par les tremblements de terre ou par la surcharge sur des infrastructures en hauteur peuvent mener à la liquéfaction partielle ou totale des sols saturés en eau. Ceci peut donc entrainer des dommages importants aux structures construites sur ces sols. Certaines méthodes existent pour remédier à ce problème, mais elles demeurent couteuses et parfois toxiques car elles utilisent de l’acrylamide et des lignosulfates. La bio-précipitation in situ de cal

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23

Bosc, Jean-Yves. "Evaluation de l'efficacité de l'hémodialyse par quantification directe de l'urée, en ligne sur le dialysat effluent : du concept à la réalité." Montpellier 1, 1995. http://www.theses.fr/1995MON11165.

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24

Villalba, Hugo Abelardo González. "Blending polymer-sulfur coated and NBPT-treated urea to improve nitrogen use efficiency and grain yield in corn production systems." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/11/11140/tde-14082018-100857/.

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Blends of controlled release and stabilized nitrogen (N) fertilizer represent an alternative to provide N at all corn growth stages, and is an option to reduce costs compared to the use of solely controlled release N. In this context, field experiments were conducted in Southeast Brazil with the use of a blend of polymer-sulfur coated urea (PSCU) and NBPT-treated urea (NBPTU) at a 70:30 ratio, applied at corn planting and incorporated into the soil. The objectives of the study were: i) to quantify and measure each fertilizer-derived N fate in the plants, and determine the nitrogen recovery eff

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25

Galindo, Fernando Shintate. "Inoculation with Azospirillum brasilense associated with silicon applied to correct soil acidity and nitrogen rates in corn and wheat crops /." Ilha Solteira, 2020. http://hdl.handle.net/11449/192642.

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Orientador: Marcelo Carvalho Minhoto Teixeira Filho<br>Resumo: Alternative management practices are needed to minimize the need for chemical fertilizer use in non-leguminous cropping systems. The use of biological agents which can fix atmospheric nitrogen and promote plant growth has shown potential as an option to improve soil nutrient availability to grass crops. In recent years, studies investigating the effects of silicon (Si) have increased substantially, especially in grain crops. This increased interest in Si is likely due to the beneficial effects of Si application on plant resistance

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26

Osawa, Carla Cristiane. "Efeito do pH e da ureia na sintese de mulita pelo metodo sol-gel, a partir de sois de silica e alumina." [s.n.], 2004. http://repositorio.unicamp.br/jspui/handle/REPOSIP/249980.

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Orientador : Celso Aparecido Bertran<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Quimica<br>Made available in DSpace on 2018-08-03T22:48:54Z (GMT). No. of bitstreams: 1 Osawa_CarlaCristiane_M.pdf: 1834636 bytes, checksum: 67659839f17d0c81af5635a9608bc551 (MD5) Previous issue date: 2004<br>Mestrado

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27

Gibson, Daragh A. "Inactivation of Ascaris in Double-Vault Urine-Diverting Composting Latrines in Panama: Methods and Environmental Health Engineering Field Applications." Scholar Commons, 2014. https://scholarcommons.usf.edu/etd/5224.

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The United Nations Millennium Development Goals have prioritized improving access to sanitation, but unfortunately about a third of the global population is still without an improved sanitation source and one billion still practice open defecation. Lack of access to adequate and safe sanitation means the proliferation of dangerous pathogens in the environment, especially soil-transmitted helminths (STHs). In the Bocas del Toro Province of Panama (and similar locations in the world), composting latrines have been built in many of the indigenous communities in the area. They are a form of dry or

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28

Alfaia, Sonia. "Étude de la dynamique de l'azote en utilisant 15n dans les sols cultives de l'Amazonie brésilienne." Vandoeuvre-les-Nancy, INPL, 1993. http://www.theses.fr/1993INPL150N.

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La dynamique de l'azote a été suivie à l'aide de l'azote 15 dans les trois principaux sols de l'écosystème amazonien, un oxisol, un ultisol et un Gley peu humique (GHP). Les études ont été conduites en plein champ et sous conditions contrôlées. L'urée a été mieux utilisée que le sulfate d'ammonium. Dans les oxisols et ultisols cette supériorité est probablement due à l'augmentation du ph qui favoriserait l'activité des microorganismes du sol. L'engrais a contribué faiblement à la nutrition azotée des plantes par rapport à l'azote provenant du sol. Les apports d'engrais, principalement sous for

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29

Hassounah, Hany [Verfasser], M. [Akademischer Betreuer] Pietzsch, K. [Akademischer Betreuer] Humbeck, and C. [Akademischer Betreuer] Syldatk. "Investigations on the phylogenetic diversity of urease producing bacteria in soil, the inhibition of urea active transportation and metabolizing in Bacillus megaterium DSM 90 / Hany Hassounah. Betreuer: M. Pietzsch ; K. Humbeck ; C. Syldatk." Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2010. http://d-nb.info/102493750X/34.

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Ochoa, Martínez Esmeralda [UNESP]. "Atributos químicos e físicos do solo e produtividade de capim-tifton 85 em resposta à aplicação de nitrogênio e esterco bovino." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/151151.

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Submitted by ESMERALDA OCHOA MARTINEZ null (esme0909@gmail.com) on 2017-07-18T14:32:37Z No. of bitstreams: 1 TESE.pdf: 2621075 bytes, checksum: 65d4af0a3b008a61a56608ffb3b47c2f (MD5)<br>Approved for entry into archive by Luiz Galeffi (luizgaleffi@gmail.com) on 2017-07-19T17:47:06Z (GMT) No. of bitstreams: 1 ochoamartinez_e_dr_jabo.pdf: 2621075 bytes, checksum: 65d4af0a3b008a61a56608ffb3b47c2f (MD5)<br>Made available in DSpace on 2017-07-19T17:47:06Z (GMT). No. of bitstreams: 1 ochoamartinez_e_dr_jabo.pdf: 2621075 bytes, checksum: 65d4af0a3b008a61a56608ffb3b47c2f (MD5) Previous issue dat

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Stark, Christine H. "Effects of long- and short-term crop management on soil biological properties and nitrogen dynamics." Lincoln University, 2005. http://hdl.handle.net/10182/30.

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To date, there has been little research into the role of microbial community structure in the functioning of the soil ecosystem and on the links between microbial biomass size, microbial activity and key soil processes that drive nutrient availability. The maintenance of structural and functional diversity of the soil microbial community is essential to ensure the sustainability of agricultural production systems. Soils of the same type with similar fertility that had been under long-term organic and conventional crop management in Canterbury, New Zealand, were selected to investigate relation

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Balieiro, Neto Geraldo [UNESP]. "Nitrogênio com ou sem calcário superficial para recuperação do capim-marandu." Universidade Estadual Paulista (UNESP), 2007. http://hdl.handle.net/11449/104949.

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Made available in DSpace on 2014-06-11T19:33:33Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-02-12Bitstream added on 2014-06-13T19:44:26Z : No. of bitstreams: 1 balieironeto_g_dr_jabo.pdf: 1088543 bytes, checksum: 541947f11b756954d1dabca944d1c19a (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>A degradação de cerca de 60 milhões de hectares de pastagens no Brasil afeta diretamente o estado nutricional dos rebanhos, conduzindo os pecuaristas a abrirem novas áreas de floresta, resultando

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Ochoa, Martínez Esmeralda. "Atributos químicos e físicos do solo e produtividade de capim-tifton 85 em resposta à aplicação de nitrogênio e esterco bovino /." Jaboticabal, 2017. http://hdl.handle.net/11449/151151.

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Orientador: Mara Cristina Pessôa da Cruz<br>Coorientador: Edson Luiz Mendes Coutinho<br>Banca: Felipe Batistella Filho<br>Banca: Flávia Fernanda Simili<br>Banca: José carlos Barbosa<br>Banca: Itamar Andrioli<br>Resumo: A intensificação da produção dos animais em sistemas confinados gera uma alta produção de esterco bovino que pode contribuir para o fornecimento de nutrientes. Além de proporcionar melhorias em atributos químicos e físicos do solo. Diante deste contexto trabalhou-se com a hipótese de que o esterco bovino pode substituir total ou parcialmente o fertilizante nitrogenado industrial

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Veloso, Marcos Emanuel da Costa. "Potencialidade de impacto ambiental por nitrato, doses de N e flutuações do lençol freático para a cultura do milho sob sistema de drenagem." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/11/11143/tde-22082006-151206/.

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O nitrogênio é o nutriente absorvido em maior quantidade pelo milho, o de maior custo e influencia diretamente na resposta da cultura em produtividade de grãos, sendo a uréia o fertilizante mais utilizado na agricultura brasileira; entretanto, o manejo inadequado do nitrogênio pode trazer sérios problemas de poluição para o ambiente. Os objetivos do presente trabalho foram: (a) verificar a potencialidade de poluição por nitrato em áreas de várzea cultivadas com milho com diferentes doses de nitrogênio, na forma de uréia; (b) quantificar o efeito das flutuações do lençol freático e das doses de

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35

Brouard, Christine. "Contribution à l'étude de la rétention de phénylurées (herbicides) par des adsorbants modèles et des sols." Angers, 1995. http://www.theses.fr/1995ANGE0006.

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Notre objectif était d'étudier la rétention d'herbicides de la famille des phenylurées sur des adsorbants minéraux et dans le sol. Les molécules retenues sont le chloroxuron, le chlortoluron, le metobromuron, l'isoproturon et le difenoxuron. Les adsorbants utilises sont la celite, le florisil, l'alumine, le carbonate et le sulfate de calcium. Les sols étudiés sont un sol limoneux-argileux et un sol limoneux-sableux. Nous poursuivons le double but analytique et environnemental d'améliorer les étapes de purification par chromatographie d'adsorption d'extraits en vue de l'analyse de résidus, et d

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Júnior, Geraldo Bueno Martha. "Produção de forragem e transformações do nitrogênio do fertilizante em pastagem irrigada de capim Tanzânia." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/11/11139/tde-29082003-153957/.

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Apesar de o manejo da pastagem ser um componente chave em sistemas pastoris, poucos esforços foram feitos para determinar a intensidade de pastejo adequada para pastagens tropicais, especialmente sob condições irrigadas. O atrativo econômico de sistemas de pastagens irrigadas depende da elevada produtividade da pastagem, o que significa que fertilizantes nitrogenados precisam ser utilizados. Entretanto, para estabelecer medidas efetivas visando o manejo do nitrogênio (N) é necessário entender o balanço entre entradas e saídas de N e a eficiência de ciclagem e transformações do N em sist

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Grigaliūnienė, Kristina. "Ilgalaikio tręšimo poveikis skirtingos kilmės dirvožemių biologiniam aktyvumui." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2006. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2005~D_20060117_170123-78293.

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The effect of organic and mineral fertilizers on biological activity of different genesis soils in long-term crop rotation trials was determined. Biological activity was diverse in the soils of different genesis and it activity correlated with some soil chemical properties. Organic and mineral fertilizers and their combinations more increased biological activity in the soil than only mineral fertilizers. Mineral fertilizers suppressed dehydrogenase and alkaline phosphatase activity (180 kg ha-1) with phosphorus and potassium fertilizers. The relationship between the crops grown, their yield an

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Moyo, Christopher Chrispin. "Effects of soil temperature on urea hydrolysis." 1988. http://hdl.handle.net/2097/22240.

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Garcia, Fernando Oscar. "Effects of soil water evaporation and potential on urea transformations in soil." 1989. http://hdl.handle.net/2097/22252.

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Germishuizen, Willem Andreas. "The use of modified urea-formaldehyde resins in soil binder systems." Diss., 2000. http://hdl.handle.net/2263/22984.

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ZHENG, GIU-MIN, and 鄭秋敏. "An investigation on the fate of urea in a soil column." Thesis, 1988. http://ndltd.ncl.edu.tw/handle/76179027259142120607.

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Adhikari, Keshav Raj, and 阿帝咖里. "NITROGEN AND PHOSPHORUS RECOVERY, LEACHING AND SOIL QUALITY CHANGES FROM COMPOSTED MANURE AND UREA APPLICATION." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/52490766071673732134.

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博士<br>國立臺灣大學<br>農業化學研究所<br>99<br>Organic fertilizers are necessary to sustain soils ability to crop production and to help reduce environmental pollution especially due to nitrogen (N) and phosphorus (P) leaching. But heavy application of these in excess of crop needs can buildup N and P levels in soil affecting soil and water quality. Composted manure is known as an environmentally safer organic fertilizer but leaching and crop recovery from composted manure applied soils is less well understood and this knowledge could help managing compost application in high rainfall areas. A green-house e

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Potthast, Karin. "Implications of land-use change and pasture management on soil microbial function and structure in the mountain rainforest region of southern Ecuador." Doctoral thesis, 2012. https://tud.qucosa.de/id/qucosa%3A26936.

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In the present thesis, implications of pasture establishment, fertilization and abandonment on soil C and nutrient dynamics were investigated for the mountain rainforest region of southern Ecuador. Over the past decades the natural forest of the study area has been threatened by conversion to cattle pastures. However, the soil fertility of these extensively grazed pastures (active pastures) declines continuously during pasture use. The invasion of bracken fern (Pteridium arachnoideum) leads to pasture abandonment when bracken becomes dominant. In order to reveal the mechanisms behind the deter

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Shi, Ying Ru, and 施盈如. "Effect of application of urea and composted hog manure on soil nitrogen fertility and rice growth." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/57828082106637982376.

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Nongqwenga, Nqaba. "Evaluation of struvite from source-separated urine as a phosphate fertilizer." Thesis, 2013. http://hdl.handle.net/10413/9710.

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The potential shortage of phosphorus (P) fertilizer is a threat to food security and closing the nutrient loop through recycling human excreta, especially urine, has been considered, so as to mitigate this crisis. Struvite (magnesium, ammonium phosphate), a material derived from human urine, is a product which is gaining credence with regards to using urine as a P amendment since more than 90% of P in urine can be captured during struvite production. A study to evaluate the potential of struvite as a P amendment in three contrasting soils was conducted. The soils used were an A horizon of Inan

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FANG, XIN-ZHENG, and 方新政. "Studies on the toxic mechanism of urea and other nitrogenous compounds on sclerotium rolfsii in soil and its application for disease control." Thesis, 1988. http://ndltd.ncl.edu.tw/handle/20617756632003428456.

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Rawluk, Christine D. L. "Effect of soil texture, temperature and irrigation on the performance of urea fertilizers amended with the urease inhibitor N-(n-butyl) thiophosphoric triamide." 2000. http://hdl.handle.net/1993/19519.

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(7830965), Houston L. Miller. "INVESTIGATION OF CORN YIELD IMPROVEMENT FOLLOWING CEREAL RYE USING STARTER NITROGEN FERTILIZER." Thesis, 2019.

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Cereal rye (CR), the most common and effective nitrogen (N) scavenging cover crop option in the Midwest, is often utilized in cropping systems to reduce nitrate loss for environmental benefits. To increase environmental efficiency in Midwest corn cropping systems, we must increase the overall adoption of CR. However, due to the yield reduction potential (6%) for corn planted after CR termination, CR is primarily recommended before soybean. To increase CR adoption, we must develop adaptive fertilizer management practices that achieve competitive grain yields relative to cropping systems where C

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