Дисертації з теми "Water Victoria Nitrogen content"
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Kong, Shu-piu. "Carbon and nitrogen content of suspended matter in a headwater catchment in Hong Kong." View the Table of Contents & Abstract, 2005. http://sunzi.lib.hku.hk/hkuto/record/B36397301.
Повний текст джерелаKong, Shu-piu, and 江樹標. "Carbon and nitrogen content of suspended matter in a headwater catchment in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B36397301.
Повний текст джерелаSerem, Vincent Kipyego Arap. "Effects of tillage and corn residues on nitrate-nitrogen and water movement through soil." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=29130.
Повний текст джерелаIn each experiment I, higher nitrate-nitrogen concentrations ($ lbrack rm NO sb{3 sp{-}}$-N)), occurred at the 0.1 and 0.2 m soil layers in RT and CT treatments initially, but less leached to lower layers, while more $ rm NO sb{3 sp{-}}$-N leached to lower depths (below 0.4 m) in the NT treatment. In experiment II, more $ rm NO sb{3 sp{-}}$-N leached below 0.4 m in RT and CT than in NT treatments. Conventional tillage exhibited the lowest drainage rates. Tillage and residue effects were significant only at early stages (4 hours or before) at some depths of experiment I ($P<0.05$). Maximum $ lbrack rm NO sb{3 sp{-}}$-N) occurred at 0.4 m depth in all treatments.
LEACHM-N estimated more $ rm NO sb{3 sp{-}}$-N leaching below 0.4 m in RT and CT treatments than in NT treatment. The model performed poorly only immediately after fertilizer application, showing up to 50% deviation from observed data. Although LEACHM-N overpredicted $ lbrack rm NO sb{3 sp{-}}$-N) in the 0.2 m soil layers in all treatments, estimations remained within standard deviations of observed data. NTRM performed well below 0.4 m depths, but often underpredicted $ rm NO sb{3 sp{-}}$-N leaching at shallower depths.
From both the laboratory experiments and mathematical simulations it was concluded that when fertilizer is applied in granular form, no till practice is undesirable because deeper $ rm NO sb{3 sp{-}}$-N leaching (below 0.4 m) occurs. Reduced tillage may be the preferred choice in such a situation. When fertilizer is applied in solution, reduced and conventional tillage practices are undesirable because deeper $ rm NO sb{3 sp{-}}$-N leaching occurred. No till practice may be a better choice in such a case.
Downing, T. G. "The role of nitrogen in the regulation of microcystin content in Microcystis aeruginosa." Thesis, Stellenbosch : Stellenbosch University, 2005. http://hdl.handle.net/10019.1/50523.
Повний текст джерелаENGLISH ABSTRACT: Several genera of cyanobacteria produce a range of toxins. The increased rate of eutrophication of surface fresh waters due to anthropogenic inputs has resulted in more frequent and severe cyanobacterial bloom events. Such bloom events make impoundments unsuitable for recreational use and increase the cost of production of potable water due to the necessity for removal of toxins released from cells during the purification process. Microcystis aeruginosa is the major freshwater bloom-forming toxic cyanobacterium. Concentrations of the hepatotoxin, microcystin, are highly variable in blooms. Published literature on environmental conditions leading to increased microcystin production was often contradictory and in many cases did not consider all relevant parameters. However, environmental nitrogen and phosphorus, temperature and light, and growth rate were implicated in regulation of toxin content. The purpose of this work was therefore to investigate environmental factors (specifically nitrogen and phosphorus) and cellular activities (specifically carbon fixation and nitrogen uptake rates and growth rate) involved in the modulation of microcystin production in M. aeruginosa in order to clarify the role of these parameters, and in an attempt to identify regulatory mechanisms for microcystin production. Environmental nitrogen, phosphorus and growth rate were shown to co-modulate microcystin production in M. aeruginosa. Adequate phosphorus is required for photosynthetic carbon fixation. Phosphorus uptake by M. aeruginosa is strongly correlated with carbon fixation rate. Although microcystin content increased with increasing nitrogen:phosphorus ratios in culture medium, under phosphorus limitation microcystin content was lower irrespective of nitrogen concentrations. This observation and the requirements for fixed carbon for nitrogen assimilation therefore prompted investigation of the effects of cellular carbon fixation and nitrogen uptake in the modulation of microcystin production. Microcystin production was found to be enhanced when nitrogen uptake rate relative to carbon fixation rate was higher than that required for balanced growth. The cellular nitrogen:carbon ratio above which microcystin concentrations increased substantially, corresponded to the Redfield ratio for balanced growth. Investigation of potential regulatory mechanisms involving the cyanobacterial nitrogen regulator, NtcA, yielded putative NtcA binding sites indicative of repression in the microcystin synthetase gene cluster. In culture, the polypeptide synthetase module gene, mcyA, and ntcA were inversely expressed as a function of carbon-fixation:nitrogen-uptake potential. However, no increase or decrease in microcystin production could be linked to either glutamine, glutamate or a-ketoglutarate, metabolites that are involved in regulation of ntcA. The role of NtcA in regulation of microcystin production could therefore not be confirmed. In conclusion, these data suggest that microcystin production is metabolically regulated by cellular C:N balance and specific growth rate. The primary importance of nitrogen and carbon was demonstrated by a simple model where only nitrogen uptake, carbon fixation and growth rate were used to predict microcystin levels. The model also explains results previously described in literature. Similarly, an artificial neural network model was used to show that the carbon fixation dependence on phosphorus allows accurate prediction of microcystin levels based on growth rate and environmental nitrogen and phosphorus.
AFRIKAANSE OPSOMMING: Verskeie genera van sianobakterieë produseer 'n verskeidenheid van toksiene. Die toename in die tempo van eutrofikasie van varswater oppervlaktes as gevolg van antropogeniese insette veroorsaak al hoe meer en al hoe erger sianobakteriële infestasies. Dit veroorsaak probleme vir ontspanninggebruik van hierdie waters en verhoog die koste van produksie van drinkbare water as gevolg van die noodsaak om die toksiene wat deur die selle gedurende die suiweringsproses vrygelaat word te verwyder. Microcystis aeruginosa is die belangrikste varswater bloeisel-vormende toksiese sianobakterium. Die konsentrasie van die hepatotoksien mikrosistien is hoogs varieerbaar in sulke bloeisels. Gepubliseerde literatuur oor die omgewingskondisies wat lei na verhoogde mikrosistienproduksie is dikwels weersprekend en neem in vele gevalle nie al die relevante parameters in ag nie. Desnieteenstaande word omgewingstikstof, fosfor, temperatuur en lig, asook groeisnelheid, geïmpliseer in die regulering van toksieninhoud. Die doel van hierdie navorsing was dus om omgewingsfaktore (spesifiek stikstof en fosfor) en sellulêre aktiwiteite (spesifiek koolstoffiskering en die snelheid van stikstofopname en van groei) betrokke by die modulering van mikrosistienproduksie in M. aeruginosa te ondersoek in 'n poging om die rol van hierdie parameters te verstaan en om regulatoriese meganismes vir mikrosistienproduksie te identifiseer. In hierdie studie is aangetoon dat omgewingstikstof en fosfor sowel as groeisnelheid mikrosistienproduksie in M. aeruginosa ko-moduleer. Genoegsame fosfor word benodig vir fotosintetiese koolstoffiksering. Fosforopname deur M. aeruginosa korreleer sterk met die snelheid van koolstoffiksering. Alhoewel mikrosistieninhoud toegeneem het met 'n toename in die stikstof:fosfor verhouding in die kultuurmedium, was die mikrosistieninhoud onder kondisies van fosforlimitering laer ongeag die stikstofkonsentrasie. Hierdie waarneming, tesame met die noodsaak van gefikseerde koolstof vir stikstofassimilering, het gelei na 'n studie van die effekte van sellulêre koolstoffiksering and stikstofopname op die modulering van mikrosistienproduksie. Dit is gevind dat mikrosistienproduksie verhoog was wanneer die snelheid van stikstofopname relatief tot die snelheid van koolstoffiksering hoër was as die waarde wat benodig word vir gebalanseerde groei. Die sellulêre stikstof:koolstof verhouding waarbo mikrosistienkonsentrasies beduidend verhoog is stem ooreen met die Redfield verhouding vir gebalanseerde groei. 'n Ondersoek na potensiële reguleringsmeganismes waarby die sianobakteriële stikstofreguleerder NtcA betrokke is het gelei na die ontdekking van moontlike NtcA bindingseteis; dit kan dui op die repressie van die mikrosistiensintetase geengroepering. Onder kultuurkondisies is gevind dat die geen vir die polipeptiedsintetase module, mcyA, en ntcA omgekeerd uitgedruk word as 'n funksie van koolstofopname:stikstofopname potensiale. Geen toename of afname in mikrosistienproduksie kon egter gekoppel word aan óf glutamien, óf glutamaat, óf a-ketoglutaraat nie, metaboliete wat betrokke is by die regulering van ntcA. Die rol van NtcA in die regulering van mikrosistienproduksie kon dus nie bevestig word nie. Die gevolgtrekking is dus gemaak dat mikrosistienproduksie metabolies gereguleer word deur die C:N balans en die spesifieke groeisnelheid. Die primêre belang van stikstof en koolstof is gedemonstreer deur 'n eenvoudige model waarin slegs stikstofopname, koolstoffiksering en groeisnelheid gebruik word om mikrosistienvlakke te voorspel. Die model verklaar ook resultate wat tevore in die literatuur beskryf is. Soortgelyk is 'n artifisiële neurale netwerkmodel gebruik om te toon dat die afhanklikheid van koolstoffiksering van fosfor akkurate voorspelling van mikrosistienvlakke gebaseer of groeisnelheid en omgewingstikstof en fosfor moontlik maak.
Delin, Sofia. "Site-specific nitrogen fertilization demand in relation to plant available soil nitrogen and water : potential for prediction based on soil characteristics /." Skara : Department of Soil Sciences, Swedish University of Agricultural Sciences, 2005. http://epsilon.slu.se/200506.pdf.
Повний текст джерелаMulvey, Michael Patrick. "Nitrogen limitation of phytoplankton growth in an oligotrophic lake." PDXScholar, 1986. https://pdxscholar.library.pdx.edu/open_access_etds/3591.
Повний текст джерелаSchultz, Paul Eaton. "Nitrogen removal and biomass production from a harvested and unharvested scirpus wetland." Virtual Press, 1997. http://liblink.bsu.edu/uhtbin/catkey/1048389.
Повний текст джерелаDepartment of Natural Resources and Environmental Management
Zhou, Xiaomin 1962. "Agronomic and physiological aspects of nitrogen and water management for monocrop corn and corn competing with a ryegrass intercrop." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=34491.
Повний текст джерелаWang, Yuexing, and 王越興. "Sediment nutrient flux for a pulsed organic load: mathematical modeling and experimental verfication." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B40987826.
Повний текст джерелаAcharya, Tej Prasad. "Water Requirements, Use Efficiency, and Insect Infestation in Brussels Sprouts, and Nitrogen Use Efficiency in Sweet Basil under Low Tunnels compared to Open-field Production." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/86610.
Повний текст джерелаMaster of Science in Life Sciences
Brussels sprouts and sweet basil are economically important cash crops on the East Coast. Brussels sprouts is a Cole crop and an important source of dietary fiber, vitamins (A, C & K), calcium, iron, manganese and antioxidants. Similarly, sweet basil is a member of the mint family and important high-value herb in the U.S. and the world. It is mainly grown for culinary purposes as a dried and fresh spice in the U.S. However, demand for these commodities is increasing. Low tunnels (LTs) covered with spunbonded fabric can be a practical management tool to increase yield. Results from this study indicate that LTs increase yield of Brussels sprouts and basil, water use efficiency and total nitrogen uptake, while reducing insect pest infestation. Therefore, LTs can be a useful tool to improve sustainability of Brussels sprouts and basil production.
Rao, Alexandra Mina Fernandes. "Carbon and nitrogen cycling in permeable continental shelf sediments and porewater solute exchange across the sediment-water interface." Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-11152006-163727/.
Повний текст джерелаMartial Taillefert, Committee Member ; Jay Brandes, Committee Member ; Markus Huettel, Committee Member ; Philip Froelich, Committee Member ; Ellery Ingall, Committee Member ; Richard A. Jahnke, Committee Chair.
To, Justin. "Assessment of the role of soil structure and water content in the interpretation of spatial variation in yield and yield response to nitrogen." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ56374.pdf.
Повний текст джерелаTrent, Tiffany Lorraine. "Water Chemistry Effects on Apple Snail (Pomacea paludosa, Say) Reproductive Patterns in the Northern Everglades." NSUWorks, 2010. http://nsuworks.nova.edu/occ_stuetd/198.
Повний текст джерелаAllan, Wendy Lynne. "Variation in the stable carbon isotope composition of needle and annual rings in Pseudotsuga menziesii (Mirb.) Franco and its relation to water use needle nitrogen content and productivity." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/mq21902.pdf.
Повний текст джерелаRogers, Daniel Richard. "Geomicrobiology of nitrogen in a coastal aquifer : isotopic and molecular methods to examine nitrification and denitrification in groundwater." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/59746.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references.
Excess nitrogen input is deleterious to coastal waters, resulting in deterioration of the water quality, increases in harmful algal blooms and disease in commercial fish stocks. A significant portion of this nitrogen enters coastal waters through groundwater systems. Here we use isotopic and molecular biological methods to identify the populations of nitrifiers and denitrifiers, where they occur, and what levels of activity are present through the upper four meters of a coastal groundwater system. This work shows two different populations of putative ammonia-oxidizing archaea (AOA) based on the ammonia mono-oxygenase gene (amoA), one shallow population most closely related to open ocean water column-like sequences and a deeper population that is more closely related to estuarine-like AOA. Interestingly, while the surface population has a potential nitrification rates (456 pmol g-1 sediment day-) similar to marine sediments, the deeper population does not show detectable evidence of nitrification. Between these two archaeal populations resides an active population of ammonia-oxidizing bacteria with similar nitrification rates as the surface AOA population. The upper meter of the aquifer is also an active area of denitrification as evidenced by the coincident drop in nitrate concentration and increase in both 15N (up to + 20. 1%o) and 5180 (up to + 11. 7%o), characteristic of groundwater affected by denitrification. 16S rRNA gene surveys of the organisms present in the upper meter also are similar to soil/sediment type environments including many potential denitrifiers. However, nitrite reductase, nirS and nirK, genes were also recovered from the sediments with nirK dominating in the surface sediments. This contrasts with the deep salt wedge, where the microbial community 16S rRNA genes appear more closely related to marine or reducing sediment/wastewater type organisms, and nirS genes become the dominant denitrification gene.
by Daniel Richard Rogers.
Ph.D.
Hernandez-Romo, Adriana. "An analysis of nitrate contaminated water in Cherry Valley." CSUSB ScholarWorks, 2005. https://scholarworks.lib.csusb.edu/etd-project/2726.
Повний текст джерелаWoldetsadik, Kebede. "Shallot (Allium cepa var. ascolonicum) responses to plant nutrients and soil moisture in a sub-humid tropical climate /." Alnarp : Dept. of Crop Science, Swedish Univ. of Agricultural Sciences, 2003. http://epsilon.slu.se/a367.pdf.
Повний текст джерелаHuang, Jing-Ping, and 黃仁彬. "Effects of Nitrogen Application Rate and Soil Water Content on Seedling Growth and Biomass Yield of Switchgrass." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/h99x4s.
Повний текст джерела明道大學
材料暨系統工程研究所
95
Switchgrass (Panicum virgatum L.) is a C4 perennial grass grown naturally in most of the central and eastern United States. A stand of switchgrass can grow vigorously over 10 years, resist drought, and survive with low fertilizer inputs. Thus, the U.S. Department of Energy has identified switchgrass as the most promising species for development into herbaceous biomass fuel crop. Switchgrass is also cultivated for the purpose of soil reclamation and habitat development of grassland birds. Switchgrass is as a multi-purpose crop with ecological function, soil conservation and bioenergy production. However, studies on switchgrass cultivation in Taiwan are very limited. In order to assess the feasibility of establishment of this multi-purpose crop in Taiwan, it is required to do detailed researches on cultivation management of switchgrass. In this study, two ecotypes of switchgrass, Alamo (A) and Blackwell (B), were selected for pot experiments. Seedling were grown in pots containing Yuliao soil and were maintained in a greenhouse for 6 months. Nitrogen (N) was applied at the rate of 0, 25, 50, 125 kg ha-1. Soil moisture levels were controlled by watering at 2 days (2D), 5 days (5D) and 8 days (8D) intervals. The results revealed that soil moisture influenced the tiller number, plant height, chlorophyll index, and tissue dry weight of switchgrass plants more significantly than nitrogen application. Tiller number and plant height of Alamo were significantly higher than that of Blackwell. Tiller number and plant height could be enhanced by increasing the nitrogen application rate and watering interval. Effects of nitrogen application and soil moisture on the tiller number and plant height were more prominent on Alamo than those on the Blackwell. Tiller number and plant height are considered as the evaluation factors for indicating the biomass yield to be harvested. The results showed that the effects of nitrogen application and soil moisture on the dry weight of aboveground tissues were more pronounced on Alamo than on Blackwell. On the other hand, the biomass yield of underground tissues of both the cultivars was influenced by the watering intervals; the dry weight of underground tissues was significantly increased with the increase in soil moisture levels resulting from frequent watering. Moreover, Alamo yielded more dry weight of underground tissues than Blackwell. Establishment of Alamo would be more beneficial for soil carbon sequestration than that of Blackwell. However, nitrogen application rate did not dshow a consistent positive response on the dry weight of underground tissues harvested. In conclusion, the morphological growth pattern and biomass yield of Alamo cultivar showed its strong ability to be a successful candidate for biofuel feedstock production in Taiwan, but the Blackwell cultivar has limited usefulness in teams of biofuel production because of low biomass yield.
Rapholo, Seroto Edith. "Modelling the effects of maize/lablab intercropping on soil water content and nitrogen dynamics using APSIM-Model." Diss., 2020. http://hdl.handle.net/11602/1568.
Повний текст джерелаDepartment of Soil Science
Maize (Zea mays L.) is widely grown in the semi-arid regions of South Africa mainly for its grain that is used for direct human consumption, feed for animals and raw materials for the industries. The challenges of soil infertility, water supply, and availability of high yielding cultivars remain a major constraint for its production in this environment. These constraints are a major threat to sustainable crop production and food security. Maize/lablab Zea mays L.\ L. purpureus) intercropping system could thus become an option for food security among small scale maize producers in dry environments. Preliminary studies show the huge potential of maize/lablab intercropping in the semi-arid environments of the North-Eastern South Africa. Therefore, this study aimed to assess the effects of maize/lablab intercropping on soil water content, nitrogen dynamics and crop productivity based field experiments and crop simulation modeling using the model APSIM. The trials were conducted at two sites (Univen and Syferkuil) in Limpopo province, South Africa, for two seasons (2015/2016) and 2016/2017). The treatments consisted of; (i) sole maize (ii) sole lablab (iii) maize and lablab planted at the same time (Maize+lablab-ST) and (iv) maize with lablab planted 28 days after maize (Maize+lablab-28).The treatments were laid out in an RCBD replicated 4 times, with individual plots size measuring 4.5 m × 4 m (18 m2) and the layout of the field as consisting of 4 plots per block giving a total of 16 plots in 4 blocks. The following parameters were determined: soil water content, soil NO3--N and NH4+-N levels, dry matter and grain yield. The APSIM-model (version 7.7) was then used to simulate maize grain yield and dry matter production to assess risks associated with the production of maize/lablab intercropping. The results obtained from this study showed that maize/lablab intercropping had significant effects on measured parameters (grain, biomass yield soil water content, and N-minerals). Maize+lablab-28 produced 46 % higher grain yield than sole cropping (24%) and maize+lablab-ST) (30%). The results also showed variation in soil water content at different depths among the treatments. The soil water content was increased with depth. The intercropped plots and lablab sole had significantly higher soil water content than the sole maize. At all depths, the highest soil water content was obtained under sole lablab followed by maize+lablab-ST and maize+lablab-28. It was notable however that maize/lablab intercropping showed a higher NO3--N and NH4+-N levels at all depths. At both sites, the soil NO3--N showed a sharp drop at V7 sampling time. The results showed the benefits of intercropping in comparison to sole cropping as demonstrated by positive land equivalent ratios of >1 for both cropping systems in both years and sites. Modelling exercises showed that APSIM was able to simulate the results sufficiently. In the simulation experiment, a stronger negative effect of planting lablab with maize simultaneously was found. Hence, delayed planting of lablab should be a standard practice
NRF
Adcock, Damien Paul. "Soil water and nitrogen dynamics of farming systems on the upper Eyre Peninsula, South Australia." Thesis, 2005. http://hdl.handle.net/2440/37810.
Повний текст джерелаThesis (Ph.D.) -- University of Adelaide, School of Earth and Environmental Sciences, 2005.
Adcock, Damien Paul. "Soil water and nitrogen dynamics of farming systems on the upper Eyre Peninsula, South Australia." 2005. http://hdl.handle.net/2440/37810.
Повний текст джерелаThesis (Ph.D.)--School of Earth and Environmental Sciences, 2005.
Roberts, Michael C. (Michael Coy) 1951. "Field sampling and mapping strategies for balancing nitrogen to variable soil water across landscapes." Thesis, 1991. http://hdl.handle.net/1957/36516.
Повний текст джерелаPeterson, Heidi Marliese. "Hybrid cattail (Typha x glauca) growth and nutrient content along a water depth gradient in two prairie marshes." 2015. http://hdl.handle.net/1993/30838.
Повний текст джерелаOctober 2015
Abbas, Haider. "Impact of overhead irrigation on nitrogen dynamics and marketable yield of potato." 2015. http://hdl.handle.net/1993/30335.
Повний текст джерелаMarkley, Barbara J. "A quick test for sulfites on foods and nitrates in drinking water." 1986. http://hdl.handle.net/2097/22160.
Повний текст джерелаJohnstone, Joseph A. "Nitrogen, Phosphorus and Carbon Dynamics during Storms in a Glaciated Third-Order Watershed in the US Midwest." Thesis, 2013. http://hdl.handle.net/1805/3460.
Повний текст джерелаThe characterization of the nutrients nitrogen, phosphorus and carbon (NPC) export to streams during storms is an integral part of understanding processes affecting water quality. Despite the fact that excessive levels of these nutrients in the Mississippi River basin adversely affects water quality in the Gulf of Mexico, little research has been conducted on NPC dynamics during storms on larger (>20 km2) agriculturally dominated Midwestern watersheds. This project examined the storm export of nitrate, ammonium, total phosphorus, and dissolved organic carbon (DOC) in the upper Eagle Creek Watershed (UECW) (274 km2) in Central Indiana, USA. Water samples were collected during five winter and spring storms in 2007 and 2008 on the rising and falling limb of the hydrograph, in order to characterize NPC dynamics during storm events. Stream discharge and precipitation was monitored continuously, and major cations were used to examine changes in source water over the duration of the storm and assist in the determination of potential flowpaths. DOC, total P, and TKN (Total Kjeldahl Nitrogen) tended to peak with discharge, while nitrate usually exhibited a slight lag and peaked on the receding limb. Total phosphorus, NH3-, TKN, and DOC appear to be delivered to the stream primarily by overland flow. NO3--N appear to be delivered by a combination of tile drain and macropore flow. Overall UECW displayed smoother nutrient export patterns than smaller previously studied watersheds in the area suggesting that scale may influence nutrient export dynamics. Further research is underway on a 3000 km2 watershed in the area to further examine the role scale may play in nutrient export patterns.
Floyd, William C. "Seasonal relationships between dissolved nitrogen and landuse/landcover and soil drainage at multiple spatial scales in the Calapooia Watershed, Oregon." Thesis, 2005. http://hdl.handle.net/1957/9501.
Повний текст джерелаGraduation date: 2006
Crowell, Morgan. "An ecosystem service approach to inform reactive nitrogen management in the lower Yakima River Basin, Washington." Thesis, 2012. http://hdl.handle.net/1957/35853.
Повний текст джерелаGraduation date: 2013
Doff, Sotta Eleneide. "Soil Carbon Dioxide dynamics and Nitrogen cycling in an Eastern Amazonian Rainforest, Caxiuana, Brazil." Doctoral thesis, 2006. http://hdl.handle.net/11858/00-1735-0000-0006-B197-C.
Повний текст джерелаMeininger, William Scott. "The influence of contemporary forest management on stream nutrient concentrations in an industrialized forest in the Oregon Cascades." Thesis, 2011. http://hdl.handle.net/1957/27062.
Повний текст джерелаGraduation date: 2012