Dissertations / Theses on the topic 'P availability'
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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.
Full textMargolis, Michael C. "Upgradable operational availability forecasting tool for the U.S. Navy P-3 replacement aircraft." Thesis, Monterey, California. Naval Postgraduate School, 2003. http://hdl.handle.net/10945/6298.
Full textThe P-3 Orion maritime aircraft has been the U.S. Navy's primary maritime patrol aircraft since its fleet introduction in 1962. Naval Aviation Systems Command (NAVAIR) has determined that the P-3 fleet has sufficiently aged to warrant a replacement. The replacement aircraft is currently undergoing the conceptual phase of development and it is during this period that NAVAIR is interested in evaluating the trade-off between operational availability and the associated cost to achieve this operational availability. This thesis developed a simulation tool that was used to investigate relationships that affect cost and operational availability of the new (notional) aircraft on a deployment. The simulation tool was exercised for select scenarios in order to gain insights into the value of investing funds in additional aircraft versus the value of investing funds in increased component reliability. The simulation was developed to be very flexible and extensible, enhancing its value for future analyses. Required data inputs into the simulation tool are formatted utilizing a new technology called Extensible Markup Language (XML) which facilitates use of the data in nearly all computer software packages. The model is robust in nature and can be applied to a wide variety of aircraft.
Margolis, Michael C. "Upgradeable operational availability forecasting tool for the U.S. Navy P-3 replacement aircraft /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03sep%5FMargolis.pdf.
Full textThesis advisor(s): Arnold H. Buss, David A. Schrady. Includes bibliographical references (p. 107-108). Also available online.
Zammit, Alessandra <1978>. "Time evolution of compromise effect: essays on the role of information availability." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/436/.
Full textEdwards, Cristie LeAnne. "Effect of Synthetic Chelating Agent Application to Soils on Phosphorus Availability." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/23690.
Full textEDTA and HEEDTA were also tested in a 4-week greenhouse study for efficiency at increasing plant available P to corn (Zea mays L.) in two soils. Phosphorus was added with and without the addition of chelating agents to the center of the pot, simulating a starter band of P. After 4weeks, soils were analyzed for WSP, Mehlich-1, and Mehlich-3 P and corn above- and below-ground biomass was quantified and analyzed for total P concentration. Without the presence of chelating agents, concentrations of WSP, Mehlich-1 P, Mehlich-3 P, above- and below-ground biomass, and TKP increased linearly as P fertilizer rates increased at 0, 9.6, 19.3, 28.9, and 38.5 kg P ha-1. Decreased P sorption using chelating agents was not observed in this experiment. However, with the results from the soil incubation, chelating agents do show potential for increasing plant available P, but the application and incorporation method needs to be further studied.
Master of Science
Mukai, Mana. "Differentiation of the vegetation-soil system through the interactions of soil N and P availabilities along an elevational gradient on Yakushima Island, Japan." Kyoto University, 2019. http://hdl.handle.net/2433/242919.
Full text0048
新制・課程博士
博士(農学)
甲第21968号
農博第2358号
新制||農||1070(附属図書館)
学位論文||R1||N5219(農学部図書室)
京都大学大学院農学研究科地域環境科学専攻
(主査)教授 北山 兼弘, 教授 小杉 緑子, 教授 舟川 晋也
学位規則第4条第1項該当
Boyanapalli, Ramakrishna Bharadwaj. "Construction and Characterization of Cyanobacterial Bioreporters to Assess Nutrient (P, Fe) Availability in Marine Environments." Bowling Green State University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1145826324.
Full textPower, Simon C. "Soil P availability limits legume persistence and distribution in the fynbos of the Cape Floristic Region." Master's thesis, University of Cape Town, 2010. http://hdl.handle.net/11427/11841.
Full textIncludes bibliographical references (leaves 64-83).
Legumes are unable to persist through post-fire succession in fynbos vegetation of the CFR unlike species in families such as Proteaceae and Restionaceae. The majority of fynbos legumes are seeders which tend to be shorter-lived than co-occurring resprouters. Seeders are likely to have a higher nutrient requirement than resprouters as they tend to invest more biomass- above ground, grow faster and produce more seed. In the oligo-trophic soils occupied by fynbos, symbiotic N2-fixation enables legumes to overcome low N availability but not low P availability. I hypothesized that: legumes are less effective at acquiring P from sparingly soluble sources compared with members of Proteaceae and Restionaceae ; legume seeders occupy soils with a higher nutrient status than resprouters. P-acquisition strategies of legumes and non-legumes were assessed.
Aslan, Attar Hesham. "Interactions between atmospheric nitrogen fixation and bioavailability of phosphorus in common bean (Phaseolus vulgaris L.) in some phosphorus-deficient soils of the Mediterranean basin." Thesis, Montpellier 2, 2011. http://www.theses.fr/2011MON20073.
Full textThe deficiency of soil minerals, particularly phosphorus (P) is a major limitation for growth and development of nitrogen-fixing by legumes. The application of phosphate fertilizers is a traditional practice to meet the needs of plant P. Thus, to test the effectiveness of use of P for symbiotic nitrogen fixation (NSF) under P deficiency, several recombinant inbred lines (RILs) of beans in their contrasting tolerance to P deficiency have been used. The main objective of this study is to assess the ability of these RILs to improve the fertility of soils deficient in phosphorus (P) and its relationship with growth and nodulation of the legume. To achieve these objectives, some experiments were conducted in greenhouses and fields. Under controlled conditions (greenhouse) and uncontrolled conditions (field), the results showed decreasing in soil pH associated with Proton release H+ and P acquisition. The increasing in available P had a positive effect on nodulation and growth of some RILs tested. Also, improving the ability of these RILs to fix atmospheric nitrogen and release H+ by nodulated roots were quantified in a controlled environment. Thus the decreasing in soil pH has reduced the un-availability of P in soil solution by transforming it into a bio-available form to the plants. In addition, the results showed significant differences between RILs in biomass and nodulation as observation in sites. We conclude that, in addition to their ability to fix nitrogen, effective use of phosphorus to save mineral fertilizer and reduce the pollution risks and could improve the availability of soil P
Santos, Elcio Ferreira dos. "Mecanismos de interação fósforo-zinco no sistema solo-planta: disponibilidade no solo, avaliações fisiológicas e expressão de transportadores de fosfato." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/64/64133/tde-24042018-114304/.
Full textConsidering that there is controversial information about the effects of P (phosphorus) Zn (zinc) interaction, it is hypothesized that the interaction P-Zn is a response to the sum of nutritional relations that occur in the level of plant and in the soil together, as a consequence of plant development and adaptive responses of cotton. The aim of the present study was to evaluate the mechanisms of P-Zn interaction in the soil-plant system for the cotton plant (Gossypium hirsutum L.), using a soil chemistry approach (P fractionation and sequential extraction of Zn in the soil), absorption dynamics of these elements (genomics - regarding the expression of genes related to P uptake) and plant physiology and nutrition (as regards the determination of acid phosphatase activities, oxidative stress, as well as gas exange and photochemical changes). To achieve the objectives of this proposal, four experiments were carried out, three in nutrient solution and one in soil. In the experiment I, we aimed to describe the availability of P and Zn in rhizosphere soil in response to P and Zn doses in two classes of soil cultivated with cotton (Gossypium hirsutum L.). In the experiment II, the objective was to investigate the effect of the interaction P-Zn on the accumulation of nutrients in the plant tissue; on changes in the photosynthetic process - determined by gas exchange; and consequent changes in cotton growth in response to P and Zn nutrition. In the experiment III, the objective was to verify the physiological availability of P and Zn by the enzymatic activity of acid phosphatase and carbonic anhydrase, as well as to describe the effect of the interaction in the gas exchanges, photochemical and antioxidant system responses of cotton plant. Finally, in the experiment IV it was characterized the PHO1 gene (phosphate transporters in roots to xylem) in cotton and evaluated the effect of the P-Zn interaction on PHO1 expression in Gossypium hirsutum
Lasbleiz, Marine. "Cycles biogéochimiques (Si, C, N, P) en lien avec la dynamique nutritionnelle du phytoplancton dans la région naturellement fertilisée des Kerguelen." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4092.
Full textBiogeochemical cycles of carbon, silicon, nitrogen and phosphorus were studied in relation to the nutritional dynamics of phytoplankton in the naturally iron-fertilized region of Kerguelen, in the Southern Ocean. This study was conducted in the framework of the KEOPS 2 program which took place in the northeastern part of the Kerguelen Plateau in early austral spring (October-November 2011). The comparison between this iron-fertilized region and an iron-limited HNLC (High Nutrient Low Chlorophyll) area confirmed some previous observations from artificial and natural fertilization experiments: iron availability clearly stimulates phytoplankton growth and especially diatom growth. Iron-fertilized regions were characterized by 3-10 fold higher chlorophyll a and biogenic silica biomasses than the iron-limited area, as well as higher biogenic silica production rates reaching values rarely observed in the Southern Ocean. The HNLC area was characterized by a nanoplanktonic assemblage mainly composed of non-siliceous autotrophic nanoflagellates. Our results highlight the importance of studying the specific composition of diatom assemblages to better understand their impact on the C and Si biogeochemical cycles. Our observations showed that physiological traits of diatoms directly drove matter export to depth in the Kerguelen region. This idea was illustrated through the seasonal evolution of the south-eastern bloom by combining our data with KEOPS 1 data. In this region, a shift in the diatom assemblage was observed in parallel to an evolution of the vertical flux of matter, and of uptake and particulate matter ratios Si:C:N
Tannergren, Christer. "Intestinal Permeability and Presystemic Extraction of Fexofenadine and R/S-verapamil." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3971.
Full textTheobald, Tim. "Regional phosphorus management in Berlin-Brandenburg." Doctoral thesis, Humboldt-Universität zu Berlin, Lebenswissenschaftliche Fakultät, 2017. http://dx.doi.org/10.18452/17725.
Full textPhosphorus (P) is an essential nutrient for all life on earth and it is thus needed in agricultural production. Today’s globalized and intensified agricultural production has led to the dependency on P inputs which are fed by phosphate rock, being a finite resource. In contrast, excessive P is a major driver in eutrophication. To sustain agricultural production, there is a need to address this problem. The aim of this thesis was to identify points at which P management could be improved for the region Berlin-Brandenburg. To analyze the system and screen for improvement, a substance flow analysis (SFA) for P for the year 2011 was compiled and for crop production the years 2005-2012 were analyzed. Also, data from 119 farms was obtained by a letter survey and relations between farm structural factors and soil test P (STP) were drawn. The results showed a negative balance for agricultural soils (-3,617 t P) and a considerable recycling potential in waste (933 t P) and wastewater (3,921 t P). Mineral fertilizer inputs amounted to 4,447 t P. P removal by crops was 15,283 t without straw and residues, being almost as low as in 2006; the year with the lowest removal by main crops. P removal by harvest varied significantly (7,069 t P/yr from 2005 to 2013) and depended on the performance of main crops which in turn is influenced by weather and soil. As a result of this, climate change may interact significantly with P flows in agriculture. Here, important variables are connected to conditions in P uptake and plant growth in general (e.g. water supply and temperature). The analyses of farms in the region showed that individual farms of small to medium size had more land with (very) high STP. Larger partnerships and companies/cooperatives were susceptible to factors causing low STP. Tenancy, grassland, extensive cattle and stockless organic farming had a lowering effect on STP. Biogas plants and intensive (cattle) farming, partly combined, were connected to a rise in STP.
Di, Hong J. "Application of isotopic dilution methods to the study of the dissolution of phosphate fertilisers of differing solubility in the soil." Lincoln University, 1991. http://hdl.handle.net/10182/1792.
Full textRanjbar, Amin. "Availability-aware provisioning in P-Cycle-Based mesh networks." Thesis, 2008. http://spectrum.library.concordia.ca/976195/1/MR45471.pdf.
Full textAlamgir, Md. "Effect of legume residues on P availability in soil and P uptake by the following wheat." Thesis, 2013. http://hdl.handle.net/2440/82704.
Full textThesis (Ph.D.) -- University of Adelaide, School of Agriculture, Food and Wine, 2013
Hasbullah. "The effects of legumes on arbuscular mycorrhizal colonisation and phosphorus uptake on wheat." Thesis, 2011. http://hdl.handle.net/2440/70191.
Full textThesis (M.Ag.Sc.) -- University of Adelaide, School of Agriculture, Food and Wine, 2011
LIOU, DAY-CHYNG, and 劉代晴. "ESTIMATION OF SPATIAL DISTRIBUTION OF FERTILLIZER-P AVAILABILITY INDEX OF SOILS AND ITS APPLICATION ON THE ESTABLISHMENT OF FERTILIZER-P RECOMMENDATION SYSTEM." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/74877161327330951101.
Full text國立臺灣大學
農業化學系研究所
86
The objectives of this study are to employ geostatistics to estimate thespati al distribution of fertilizer-P availability index and soil availableP and to establish fertilizer-P recommendation system on the basis ofgeographic informa tion system ( GIS ) to recommend the amounts of fertilizer-P.The study site wa s in an area of 430 ha in Changhua county; the intervalof sampling points are 250 m and there are 62 soil samples collected ateach sampling location to a de pth of 0-15 cm. The fertilizer-P availabilityindex of soil samples was measure d using 10 day's incubation. The resultsshowed that there are good linear rela tionship between extractable P andapplied P for the tested soil samples. In sp atial structure analysis, theranges of semivariogram of fertilizer-P availabil ity index and soilavailable P are 1972 and 533 m, respectively. It suggested t hat the intervalof sampling points of this study is suitable for using geostat istics toestimate the spatial distribution of fertilizer-P availability index andsoil available P. The spatial distribution of fertilizer-Pavailability inde xand soil available P are further estimated by ordinary kriging and the spatia l data of these two parameters are builded as readable files for the software- MapInfo of GIS; In addition, the data of soil availableP sufficient level for crop growing and P2O5(%) of fertilizer areincorporated using GIS's system pro gram-MapBasic to establish thefertilizer-P recommendation system.
Beever, Douglas W. "Effect of various nitrogen fertilizers on solubility and plant availability of phosphorus in dual N-P bands." 1987. http://hdl.handle.net/1993/15428.
Full textKumaragamage, Darshani. "Effect of four salts on the transport and retention of fertilizer P in soils and its availability to plants." 1991. http://hdl.handle.net/1993/17309.
Full textMaranguit, Deejay Sabile. "Land-use Control on Abiotic and Biotic Mechanisms of P Mobilization." Doctoral thesis, 2017. http://hdl.handle.net/11858/00-1735-0000-0023-3F2F-1.
Full textPoulassichidis, Antonios. "Reliability modeling for capital project decisions." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-08-1629.
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