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Dissertations / Theses on the topic 'Phosphatic fertilizers'

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Published: 4 June 2021

Last updated: 25 July 2025

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1

Fleming, Nigel Kevin. "Polyphosphates and microbial uptake of phosphorus : studies with soil and solution culture." Title page, contents and summary only, 1992. http://web4.library.adelaide.edu.au/theses/09A/09af598.pdf.

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2

Smith, Leslie Owen 1960. "Effect of broadcast phosphorus on alfalfa yield and quality." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/558068.

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3

Zhang, Tiequan. "Chemical behavior of phosphorus over time in fertilized soils." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=34486.

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Fertilizer P accumulates in soils, with potential for movement to waterways, causing eutrophication. Fertilizer P reactions in monoculture corn (Zea mays L.) production over time will determine environmentally sound soil management practices. Soil P changes over time were determined on a Chicot sandy clay loam (Grey Brown Luvisol) and a Ste. Rosalie clay (Humic Gleysol). Fertilizer P was added at 44 and 132 kg P ha$ sp{-1}$ and to the Chicot soil only, manure containing 60 kg P for the first five years. Mehlich-3 (M3) extraction, soil P fractionation, $ sp{31}$P NMR analysis, P in leaching wat

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4

Mkpong, Offiong Etim. "The effects of variable moisture levels on extractable Bray-l P, Bray-l Al, Bray-l Fe, Bray-l Mn : fertilizer P recommendation based on quicktest technique /." The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487329662144707.

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5

Norrish, Shane A., University of Western Sydney, of Science Technology and Environment College, and School of Environment and Agriculture. "Soil and water interactions controlling wheat crop response to phosphorus fertiliser in north-western New South Wales." THESIS_CSTE_EAG_Norrish_S.xml, 2003. http://handle.uws.edu.au:8081/1959.7/613.

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This thesis examines the response to P fertiliser by wheat crops growing in the vertosol soils of the low rainfall areas of the northern grain zone of eastern Australia. Farmers in this region depend on water accumulated from rainfall over a fallow period and stored in the subsoil to increase wheat grain yield beyond that normally achievable from in-crop rainfall and to decrease the production risks due to rainfall variability. The large variability in stored water, seasonal rainfall and subsoil properties result in extremely varied yield and yield responses to P fertiliser between seasons and

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6

Melland, Alice Rowena. "Pathways and processes of phosphorus loss from pastures grazed by sheep /." Connect to thesis, 2003. http://eprints.unimelb.edu.au/archive/00002204.

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Thesis (Ph.D.)--University of Melbourne, School of Agriculture and Food Systems,Institute of Land and Food Resources, 2004.<br>Typescript (photocopy). Includes bibliographical references (leaves 249-282).

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7

Fu, Yong 1948. "Solid activity coefficients of phosphate adsorbed by soil." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276722.

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The data of 14 soils were used to compute the ion activity product (IAP), the ratio of the ion activity product and to the solubility product (Ksp) of the pure minerals (IAP/Ksp) and to estimate the solid activity coefficients (SAC) of the soil components. The value of IAP and SAC of AlPO4 differs from soil to soil and increases with increasing P added to soil in acid soils and for calcium phosphate in basic soils. Magnesium apparently did not cause P adsorption or precipitation in the soils studied. The SAC of aluminum phosphate ranged from 10 to 10000 in acid soils. The mole fraction of the

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8

Guppy, Christopher Neil. "Phosphorus and organic matter interactions in highly weathered soils /." St. Lucia, Qld, 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17420.pdf.

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9

Nash, David. "Phosphorus transfer from land to water in pasture-based grazing systems /." Connect to thesis, 2002. http://eprints.unimelb.edu.au/archive/00000752.

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10

Grenier, Aline M. "Influence of selected endomycorrhizal fungi and phosphorus fertilization on the growth and mineral nutrition of onion grown in newly reclaimed organic soil." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=69533.

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Onions are highly responsive to endomycorrhizae and improved plant growth is among the benefits associated with this symbiosis, particularly in low phosphorus soils. Although this crop is grown extensively in organic soils, few studies have been conducted on these. Onion plants (Allium cepa L. cv. Norstar) were inoculated with Glomus aggregatum Schenck & Smith, Glomus clarum Nicolson & Schenck, Glomus fasciculatum Gerdemann & Trappe, Glomus intraradix Schenck & Smith and Glomus versiforme (Karst.) Berch and grown in the field and under controlled conditions to evaluate their efficiency in newl

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11

Sprinkle, Amy Lyn. "Nutrient management on golf courses in Delaware." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 1.01Mb, 155 p, 2005. http://wwwlib.umi.com/dissertations/fullcit/1428197.

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12

Kilgour, Douglas William. "Potential negative effects of adding phosphate-based fertilizers to lead in metal-contaminated soils." Auburn, Ala., 2007. http://repo.lib.auburn.edu/07M%20Theses/KILGOUR_DOUGLAS_2.pdf.

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13

Ochwoh, Victor Akangah. "The dynamics of phosphorus extractability, adsorption, and desorption rates as influenced by phosphorus applications and incubation times." Thesis, University of Pretoria, 2002. http://hdl.handle.net/2263/28636.

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In a study to investigate the fate of the applied P in soils, a red-sandy clayey soil (Ferric Luvisols) from Rustenburg (high P fixing) and a red-sandy loam soil (Ferric Acrisols) from Loskop (low P fixing) were used. Sequential P fractionations were used to determine the content of the different P pools to show which pool the applied P was transformed to. The soils treatments consisted of different Prates (0, 25, 50, 100, 150, and 200 mg kg-1), and incubation periods (1, 60, 120, 180, and 240 days) under a laboratory conditions. The sequential P fractionation procedure consisted of extraction

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14

Mengesha, Abi Taddesse. "Characterizing phosphate desorption kinetics from soil: an approach to predicting plant available phosphorous." Pretoria : [s.n.], 2008. http://upetd.up.ac.za/thesis/available/etd-01212009-094137.

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15

More, Ketseemang. "Response of cabbage (Brassica Oleracea Var Capitata) transplants to nitrogen, phosphorus and potassium nutrition." Diss., Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-09212007-133240.

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16

Unuofin, Frank Oshioname. "Optimization of the vermidegradation of cow dung – waste paper mixtures." Thesis, University of Fort Hare, 2014. http://hdl.handle.net/10353/d1021276.

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Vermicomposting is an eco-friendly waste management strategy. Its successful performance necessitate that key functioning parameters like earthworm stocking density, nutrient enrichment be established for each target waste/waste mixture. One main target waste mixture in South Africa, and in the University of Fort Hare in particular is waste paper mixed with cow dung and rock phosphate (RP) for phosphorus (P) enrichment. This study was carried out to address the following specific objectives, to determine (i) the effect of Eisenia fetida stocking density on the bioconversion of cow dung waste p

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17

Barnett, G. M. (Gordon M. ). "Feed additives and animal waste phosphorous reactions." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41322.

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Organic phosphorus (P$ sb{ rm o}$) in farm animal wastes must be mineralized to inorganic P for subsequent plant use. This study was conducted to determine if feed additives affect P$ sb{ rm o}$ mineralization, manure decomposition, and plant growth. Feed additives in aqueous systems affected the P mineralization of inositol hexaphosphate by phytase and of adenosine monophosphate by alkaline phosphatase. Pronounced effects were produced by bacitracin and both enzymes and by neomycin on phytase. Feed additives in dairy cattle (Bos taurus L.) manure produced effects on microbial activity as meas

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18

Norrish, Shane. "Soil and water interactions controlling wheat crop response to phosphorus fertiliser in north-western New South Wales." View thesis, 2003. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20051013.115006/index.html.

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19

Андрієнко, Ніна Ігорівна, Нина Игоревна Андриенко, Nina Ihorivna Andriienko, Сергій Васильович Вакал, Сергей Васильевич Вакал та Serhii Vasylovych Vakal. "Использование алжирских фосфоритов в качестве сырья для производства фосфорных минеральных удобрений". Thesis, Издательство СумГУ, 2004. http://essuir.sumdu.edu.ua/handle/123456789/23589.

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20

Mpabanga, Nkosi. "The effect of phosphorus fertilizer application on growth, biomass and nutritive value of Pigeon pea (Cajanus cajan (L.) Millsp.) varieties in Alice, South Africa." Thesis, University of Fort Hare, 2017. http://hdl.handle.net/10353/6180.

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Low soil fertility has been identified to be among the major causes of low pasture quantity and quality. Scarcity of high quality forage mainly during the dry season threatens animal productivity in some areas of South Africa, thus the need for identifying livestock feed alternatives. Pigeon pea is a woody legume that has continually been an important shrub in agroforestry and can provide protein-rich livestock feed during times of shortage. Soil fertility to support the production of pigeon pea can be enhanced by application of fertilisers. Therefore, this study was carried out firstly, to de

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21

Conceição, Fabiano Tomazini da. "Comportamento geoquímico de radionuclídeos e metais pesados em solos da Bacia do Rio Corumbataí (SP) /." Rio Claro : [s.n.], 2004. http://hdl.handle.net/11449/103021.

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Orientador: Daniel Marcos Bonotto<br>Banca: Marta Silvia Maria Mantovani<br>Banca: Sonia Maria Barros de Oliveira<br>Banca: Gilberto José Garcia<br>Banca: Jairo Roberto Jiménez-Rueda<br>Resumo: Este trabalho visou estudar o comportamento geoquímico de radionuclídeos e metais pesados em solos de uso agrícola na bacia do Rio Corumbataí (SP). A concentração e variabilidade natural em rochas sedimentares na bacia do Rio Corumbataí segue a tendência Ca > Mg > K > Na, com baixa concentração natural de metais pesados e radionuclídeos. A distribuição das taxas de dose nos solos mostra que ocorre uma m

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22

Bernd-Steffes, Dawn E. "Effects of phosphorus fertilization on growth and survival of Liatris pycnostachya, Physostegia virginiana, and Sporobolus heterolepis seedlings in a prairie restoration project." Virtual Press, 2000. http://liblink.bsu.edu/uhtbin/catkey/1189407.

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The effects of phosphorus fertilization on the growth and survival of Liatris pycnostachya, Physostegia virginiana, and Sporobolus heterolepis seedlings were examined in a prairie restoration project. Treatment included fertilizing once at the time of planting. Plant responses were measured on two soil types, Bono (very high phosphorus levels, lower and flatter) and Morley (very low phosphorus levels, on a slight hill with some slope). P fertilization did not increase the growth of any species on either soil type, although results may have been limited by the effects of surrounding plant compe

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23

Conceição, Fabiano Tomazini da [UNESP]. "Comportamento geoquímico de radionuclídeos e metais pesados em solos da Bacia do Rio Corumbataí (SP)." Universidade Estadual Paulista (UNESP), 2004. http://hdl.handle.net/11449/103021.

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Made available in DSpace on 2014-06-11T19:32:21Z (GMT). No. of bitstreams: 0 Previous issue date: 2004-03-08Bitstream added on 2014-06-13T18:43:40Z : No. of bitstreams: 1 conceicao_ft_dr_rcla.pdf: 3191625 bytes, checksum: acbc3e9009e76a6712eb2befd4d5dc95 (MD5)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>Este trabalho visou estudar o comportamento geoquímico de radionuclídeos e metais pesados em solos de uso agrícola na bacia do Rio Corumbataí (SP). A concentração e variabilidade natural em rochas sedimentares na bacia do Rio Corumbataí segue a tendência Ca > Mg > K >

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24

Sigrist, Andrew B. (Andrew Bernard). "Influence of incubating liquid hog manure and monocalcium phosphate on phosphorus availability and fractionation." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=69518.

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Incubation mixtures of liquid hog manure (LHM), with and without monocalcium phosphate (MCP) were added to an Ormstown silty clay loam and a Ste. Rosalie clay. Ryegrass (Lolium multiflorum Lam.) was cultivated in a pot study in order to determine yield, total P uptake and soil P content as affected by various P and manure treatments.<br>Aeration of LHM with MCP was successful in reducing ammonia volatilization by 62.4%. However, for both soils, neither of the treatments; LHM amended and aerated with MCP and applied at 32 t ha$ sp{-1}$ LHM containing 513 kg $ rm P sb2O sb5 ha sp{-1}$ from MCP n

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25

Rose, Terry. "Deep-placed phosphate fertiliser improves phosphorus uptake and seed yield of canola (Brassica napus L.) in a Mediterranean-type climate." University of Western Australia. Dept. of Soil Science and Plant Nutrition, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0237.

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In Mediterranean-type climates, topsoil frequently dries out during spring. Problems associated with reduced nutrient (P, K) availability in dry topsoil may be overcome by placing fertilisers deeper in the soil, where the soil is more likely to remain moist for longer periods as opposed to conventional fertiliser placement. Deep-P placement has resulted in significant yield improvements for lupin crops in Mediterranean environments because lupin crops generally require soil P supply during spring (throughout the flowering stage); in contrast, wheat yields have seldom improved with deep P place

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26

Landry, Christine. "Phosphorus fertilization and mycorrhizae influence soil phosphorus dynamics, corn nutrition and yield under reduced-tillage practices." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=115705.

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Grain corn (Zea mays L.) production occupies more farmland than any other annual crop in Quebec and is expanding demand from the livestock sector and the emerging bioethanol industry. Corn production requires high nutrient inputs and intensive tillage (IT). Many producers have thus switched to conservation tillage systems like ridge-tillage (RT) to overcome soil compaction and erosion problems that are common in IT systems. However, fertilizer guidelines developed for IT soils are used in RT although RT adoption greatly modifies phosphorus (P) dynamics. Lower fertilizer P requirements are expe

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27

Sommerville, David W. "Phosphorus fertilization : effects on asparagus yield, and soil microbial parameters." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=80876.

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Asparagus (Asparagus officinalis) is a perennial crop well suited to grow in Quebec. Despite high demand for this crop, asparagus production is declining because of asparagus root rot disease that is caused by Fusarium spp. Phosphorus is one of the most important nutrients for the production of healthy asparagus roots that may resist infection by Fusarium. The objective of this study was to determine the effects of phosphorus (P) applications on asparagus yield and soil microbial parameters. Plots receiving 0 to 200% of the P recommendation, based on the Centre de reference en agricultu

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28

Xie, Rongjing. "Ortho- and pyrophosphate sorption effects on zinc transformations in three Quebec soils." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75928.

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Crop-available zinc is affected by P-Zn interactions in soils. Orthophosphate (OP) additions may decrease or have no effect, while pyrophosphate (PP) may increase or have no effect on Zn solubility. Mechanisms involved in the interactions are not well understood and need to be quantified on agricultural soils subjected to P fertilization.<br>Top and sub-samples from three Quebec agricultural soils were equilibrated with OP or PP solutions, then with Zn solutions, and finally with solutions containing neither P nor Zn. The first equilibration evaluated P sorption effects on soil cation exchange

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29

Gichangi, Elias Maina. "Enhancing phosphorus availability in some phosphate fixing soils of the Transkei region, South Africa using goat manure." Thesis, University of Fort Hare, 2007. http://hdl.handle.net/10353/80.

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Low availability of soil phosphorus (P) caused by strong sorption of P is a major constraint to agricultural production in most South African soils, particularly those from the high rainfall areas. The aim of this study was therefore to investigate whether combined addition of goat manure with inorganic P fertilizers could enhance P availability in some P fixing soils of the Transkei region, South Africa. The study addressed the following specific objectives (i) to assess P sorption capacities and requirements of selected soils and their relationship with selected soil properties and single po

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30

Derkintis, Tadas. "Sertifikuotų ekologiškų fosforo trąšų įtaka dirvožemio ir žemės ūkio augalų elektrocheminėms savybėms." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2009. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2009~D_20090615_115155-18806.

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Darbo tikslas – nustatyti fosforo trąšų įtaką dirvožemio elektrocheminių parametrų kaitai bei miežių grūdų kokybės parametrams. Darbo uždaviniai: o nustatyti sertifikuotų ekologiškų fosoforo trąšų fosforitmilčių įtaką dirvožemio elektrocheminėms savybėms; o nustatyti sertifikuotų fosforo trąšų įtaką žemės ūkio augalų grūdų elektrocheminėms savybėms. Darbo objektas – Lietuvos žemės ūkio universiteto Agroekologijos centro ekologinės gamybos ūkio dirvožemis bei jame auginti vasariniai miežiai. Darbo rezultatai. Lietuvos žemės ūkio universiteto Agroekologijos centro ekologinės gamybos ūkyje at

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31

Lukhele, Nomagugu Precious. "Site-specific environmental risk assessment for phosphorus runoff." Thesis, University of Limpopo, 2014. http://hdl.handle.net/10386/1291.

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Thesis (MSc. Agriculture (Soil Science)) -- University of Limpopo, 2014<br>Phosphorus (P) runoff from agricultural sites and the subsequent loading into surface water bodies contribute to eutrophication. Environmental concerns associated with P loading in soil have motivated the need for the development of a proper tool that will allow farmers to identify agricultural areas or management practices that have the greatest potential to accelerate eutrophication. The objective of the study was to determine the spatial variability of soil test P, soil loss potential of the farm, P application

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32

Fan, Mingxiang. "Urea and acidic phosphate interactions in fertilizer microsites and their effect on corn (Zea mays L.) yield and nutrient use efficiency." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41334.

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Fertilizer applications of urea and triple superphosphate (TSP) suffer from low efficiency for corn production. Band or broadcast application of urea with acidic-P fertilizers may increase fertilizer efficiency. Urea and acidic-P fertilizer interactions in soil-fertilizer microsites were investigated using two Quebec soils. Adding acidic phosphates such as TSP and monoammonium phosphate (MAP) to urea reduced pH in microsites, urea hydrolysis, NH$ sb3$ volatilization, and increased soil NH$ sb4$- and NO$ sb3$-N contents. Ammonia loss decreased as P$ rm sb2O sb5$: urea-N ratios increased. Adding

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33

Yusiharni, Baiq Emielda. "An evaluation of chicken litter ash, wood ash and slag for use as lime and phosphate soil amendments." University of Western Australia. Faculty of Natural and Agricultural Sciences, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0078.

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[Truncated abstract] Standard AOAC methods of chemical analysis have been used to characterize and evaluate the industrial byproducts; partly burnt chicken litter ash (CLA), totally burnt chicken litter ash (CLAT), wood ash (WA) and iron smelting slag for use as a combined liming agent and phosphate fertilizer. Rock phosphate has this function and was included for comparison purposes. All the byproducts had pH values above 9 and a liming capacity above 90% of pure lime, as a result, these materials will be effective as liming agents. Total P concentrations for CLA, CLAT, slag, and WA were 3.6%

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Lucas, P. W. "Fertilizer phosphate-ammonium interactions in soil." Thesis, University of York, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374186.

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Митова, И. И., Ю. А. Ахмед та Р. Чутуркова. "Оценка факторов рабочей среды при производстве фосфорных удобрений". Thesis, Сумский государственный университет, 2013. http://essuir.sumdu.edu.ua/handle/123456789/48081.

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Сделана оценка факторов рабочей среды при производстве фосфорных удобрений в "Агрополихиме" АД – в цехе "Фосфорная кислота" и в цехе "Тройной фосфат". Ведущее место по своей выраженности занимают химические вредные факторы. Кроме этого, внимание направлено на физико- химический фактор пыли и физический фактор шума.

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Shandyba, A. B., D. M. Shpetny, and A. V. Vasilushenko. "Production of environmental fertilizers by Ukrainian phosphate industry." Thesis, Sumy State University, 2016. http://essuir.sumdu.edu.ua/handle/123456789/46861.

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The fertilizer industry uses a wide range of production technologies, which are considered under engineering and environmental aspects. The traditional composition ration of N, P, K had changed to more using the additional microcomplex and organic components. The objective of this study was to evaluate agronomic and environmental effectiveness of the new mineral-organic generation fertilizers by comparing it with the other fertilizers such as the super phosphate (as P source) or ammophos of traditional trade marks.Technical feasibility of the phosphate fertilizer industry has been demonstrated

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37

Braga, Graziela. "Eficiência de fosfatos com solubilidade variável em água em solos com capacidade de fixação de fósforo induzida." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/11/11140/tde-29062006-114403/.

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O presente trabalho constou de dois experimentos, ambos realizados em casa de vegetação do Departamento de Solos e Nutrição de Plantas da ESALQ/USP com delineamento experimental de blocos ao acaso, nos quais utilizaram-se amostras de um Latossolo Amarelo adicionando-se ou não um gel de ferro (Fe), estabelecendo assim condições distintas de capacidade de fixação de fósforo (CFF) para um mesmo solo. As fontes de P testadas foram: (i) fosfato monocálcio p.a. (FMC), que foi utilizado como fonte padrão, (ii) superfosfato simples com baixa solubilidade em água (low-grade SSP, LG SSP), (iii) multif

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38

Benedito, Daniela da Silva. "Eficiência agronômica de fontes alternativas de fósforo e modelo de predição do uso de fosfatos naturais." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/11/11140/tde-08112007-095724/.

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Os fertilizantes fosfatados (FF) mais utilizados na agricultura são solúveis em água, e requerem enxofre elementar e concentrados apatíticos de elevada qualidade para produção, conduzindo à subutilização dos depósitos de fosfato (perdas elevadas de P no beneficiamento). Conseqüentemente, é necessário estudar as fontes alternativas de P. Neste trabalho foram estudadas quanto à: (i) revisão de literatura que tenta mostrar a situação atual no Brasil e no mundo; (ii) produção alternativa de fonte de P que integra matéria orgânica e RF (Humifert); e (iii) utilização de software para predizer a efic

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39

Compaoré, Emmanuel N. "Contribution à la caractérisation et à la gestion de la fertilité phosphatée des sols ferrugineux tropicaux." Vandoeuvre-les-Nancy, INPL, 1996. http://www.theses.fr/1996INPL115N.

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La fertilité phosphorique du sol est une contrainte majeure à l'établissement d'une production agricole soutenue dans les sols ferrugineux tropicaux d'Afrique de l'ouest. Cette étude est consacrée à l'amélioration du statut phosphaté des sols ferrugineux tropicaux les plus représentatifs de cette zone. Quatre vingt quatre échantillons de terre, prélevés au Burkina Faso sont utilisés pour cette étude. La fertilité phosphorique des terres a été caractérisée par trois méthodes d'analyse chimique et par la méthode des cinétiques d'échanges isotopiques. L’efficacité agronomique des phosphates natur

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40

Francois, A. Joyce. "Composting phosphorus fertilizer with organic wastes to stablize the fertilizer against fixation by phosphate-fixing soils." Thesis, University of Oxford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236297.

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Kulay, Luiz Alexandre. "Uso da análise de ciclo de vida para a comparação do desempenho ambiental das rotas úmida e térmica de produção de fertilizantes fosfatados." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-26102017-112209/.

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Dada sua importância para o crescimento de diversas culturas, o fósforo encontra uso regular na produção de fertilizantes. Entretanto, o fato desse elemento apresentar-se na natureza em uma forma não assimilável pelos vegetais, fez com que a indústria de fertilizantes fosse forçada a desenvolver processos para sua dissolução. Esses processos costumam, em geral, ser agrupados segundo duas grandes rotas: a rota úmida e a rota térmica. Os processos que constituem a rota úmida caracterizam-se por promover a digestão do mineral de fósforo por meio de ácidos minerais tais como o sulfúrico e o fosfór

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42

Woldetsadik, 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.

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Van, der Merwe Petrus. "Phosphorus phyto-availability and fertilizer value of petrochemical and municipal wastewater sludges." Diss., University of Pretoria, 2014. http://hdl.handle.net/2263/46060.

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A growing population, urbanization and an increase in the number of industries is causing an increase in sewage sludge (SS) that needs to be either beneficially used or disposed of. Application of SS to agricultural lands is a well-known practice but the plant available phosphate and phosphate fertilizer value of SS has been of concern. This is especially due to the wide variety of soils that SS is applied to and the different phosphate removal processes that sewage waste water undergoes at the water care works and the source used to produce SS. Phosphate phyto-availability and phospha

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44

McKean, S. J. "Phosphate desorption characteristics of some tropical soils." Thesis, University of Reading, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234447.

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45

Ottman, Mike, Jason Rovey, Ayman Mostafa, and Worku Burayu. "Phosphorus Fertilizer Rate Effect on Alfalfa Yield and Soil Test P, Buckeye, 2014." College of Agriculture, University of Arizona (Tucson, AZ), 2015. http://hdl.handle.net/10150/560411.

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10 pp.<br>Phosphorus is the primary fertilizer nutrient needed by alfalfa in Arizona. The objective of this study is to determine the effect of P fertilizer rate on alfalfa yield and soil test P. A phosphorus fertilizer rate study was conducted with alfalfa in Buckeye, AZ where 11-52-0 was applied at 0, 200, 400, and 800 lb fertilizer/acre in February, 2014 after the first cutting. Alfalfa hay yield was increased by phosphorus fertilizer application up to the cutting on July 30, but not thereafter. No differences in yield were found among the fertilizer rates of 200,400, and 800 lb 11-52-0/acr

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Gao, Lu. "Phosphorus Reclamation from Municipal Wastewater Sludge for Fertilizer Production." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36712.

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The increasing population with its associated rising food demand requires more agricultural fertilizers to maintain the harvest for food security. However, the natural calcium carbonate phosphate mineral (carbonate apatite) used to produce phosphorus (P) fertilizer is a non- renewable ore. Therefore, in this study, the objective is to extract the inorganic polymeric phosphate (polyphosphate: polyP) P-component in waste activated sewage sludge (WAS) from Ottawa’s municipal wastewater plant (ROPEC). Once extracted, the goal was to break down the polyP to inorganic phosphate (Pi) to produce carbo

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Harmassi, Mehrez. "Valorization of phosphate from industrial and domestic effluents as by-products for fertilizers production." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/398248.

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Phosphorus in wastewater is mainly present as inorganic phosphate forms and is commonly removed through chemical co-precipitation using Al(III) and Fe(III) salts. However, precipitation is expensive and generates a waste to be disposed. If the recovery of phosphorus is the target objective the solution could be based on the integration of specific chemical processes or physico-chemical treatment process to recover phosphorous as pure mineral phases or supported onto low-cost inorganic sorbents. Recovery of phosphate from diluted streams has been evaluated by integration of a pre-concentration

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SILVA, Fernando Bruno Vieira da. "Inputs of heavy metals and rare earth elements in soils via phosphate fertilizers and correctives." Universidade Federal Rural de Pernambuco, 2018. http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/7319.

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Submitted by Mario BC (mario@bc.ufrpe.br) on 2018-07-03T12:33:34Z No. of bitstreams: 1 Fernando Bruno Vieira da Silva.pdf: 2951669 bytes, checksum: 66617183e704a4a70786da7c556e26e5 (MD5)<br>Made available in DSpace on 2018-07-03T12:33:34Z (GMT). No. of bitstreams: 1 Fernando Bruno Vieira da Silva.pdf: 2951669 bytes, checksum: 66617183e704a4a70786da7c556e26e5 (MD5) Previous issue date: 2018-01-08<br>Phosphate fertilizers and corrective are significant sources of soil contamination by heavy metals and rare earth elements, and long-term cultivated soils can accumulate heavy metals above the max

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Mancarella, Silvia <1990&gt. "Sewage sludge hydrolysates and organic waste as alternative phosphate fertilizers in a circular economy strategy." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amsdottorato.unibo.it/8654/1/Mancarella_Silvia_tesi.pdf.

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Phosphorus (P) is one of the main plant nutrients, but it has very low solubility due to strong bonds with Al and Fe in acidic soils and with Ca and Mg in alkaline soils. The higher food demands has led to an increase of the use of phosphate fertilizers, mainly derived from phosphate rocks, which are predicted to be depleted in the next decades. Thus, there is the improving need to close the P cycle in order to reduce the P input from mineral source, recycling P rich organic products such as animal manure and human excreta. The aim of this work was to study the P availability for plants in cal

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Tejos, Dante Pinochet. "The residual effect of applications of phosphate fertilizer measured by the Olsen method." Thesis, University of Reading, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308579.

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