Academic literature on the topic 'Potassic enrichment'
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Journal articles on the topic "Potassic enrichment"
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Dyulgerov, Momchil. "Potassic syenite from Shipka, Central Balkan Mts, Bulgaria: characterization and insight into the source." Geologica Balcanica 40, no. 1-3 (December 2011): 3–12. http://dx.doi.org/10.52321/geolbalc.40.1-3.3.
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Petrographic, mineralogical and whole-rock chemistry data from a new outcrop of peralkaline potassic syenite of presumed Variscan age near the town of Shipka, are presented here. The syenites exhibit peralkaline chemistry and very potassic character which markedly differs from nearby situated potassic monzonites, known as Shipka pluton. In spite of the close spatial association of these two bodies, genetic link between them can hardly be supposed. The syenites are composed of K-feldspar, diopside, mica and late interstitial amphibole. Mineral composition reflects the agpaitic conditions of crystallization with formation of sodic amphibole and K-feldspars with important Sr and Ba contents. These rocks have peralkaline wholerock chemistry, very high potassic content and extreme enrichment in LILE, LREE, Th and U. Their trace element signature and isotope characteristics are in favour of derivation from metasomaticaly enriched mantle source.
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Dyulgerov, Momchil, and Tanya Stoylkova. "Mineralogical and geochemical characteristics of the Sedemte Prestola potassic alkaline pluton." Geologica Balcanica 51, no. 3 (December 30, 2022): 57–69. http://dx.doi.org/10.52321/geolbalc.51.3.57.
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The Sedemte Prestola pluton is an intermediate to acid plutonic body of Variscan age (308.7 ± 9.1 Ma). Despite its small size, several petrographic varieties are present: syenites, quartzsyentes and granites. It is composed of potassium feldspar, quartz, sodic-calcic amphibole; biotite, when present, is often rimmed by amphibole or strongly altered; zircon, titanite, apatite and ilmenite are the accessory phases. The rocks display pronounced potassic character with up to 10.4 wt% K2O, peralkaline tendency, and significant trace element enrichment for REE, Zr, Th, U, and Ba. The rocks also show enriched isotopic characteristic with 87/86Sri between 0.7107 and 0.7111, and 143/144Ndi between 0.51193 and 0.51182. The geochemical features of the Sedemte Prestola pluton imply orogenic geodynamic setting of formation as a product of more primitive magma fractionation. Isotopic characteristics and high LILE, Th and U contents support the derivation from enriched mantle source – phlogopite-bearing peridotites in the spinel stability field.
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Rogers, N. W. "Potassic magmatism as a key to trace-element enrichment processes in the upper mantle." Journal of Volcanology and Geothermal Research 50, no. 1-2 (April 1992): 85–99. http://dx.doi.org/10.1016/0377-0273(92)90038-f.
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ΒΟΥΔΟΥΡΗΣ, Π. "Mineral composition of mafic minerals and ore deposition from the Kassiteres (Sappes) and Pagoni Rachi ( Kirki) porphyry Cu-Mo prospects / W. Thrace." Bulletin of the Geological Society of Greece 34, no. 3 (January 1, 2001): 1005. http://dx.doi.org/10.12681/bgsg.17138.
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The porphyry Cu-Mo mineralizations at Kassiteres and Pagoni Rachi are genetically related with dioritic to dacitoandesitic subvolcanic rocks that were and preliminary microthermometric data indicate that the hypogene mineralizations were introduced during albitic / potassic alteration of the intrusives and temperatures about 400°C from boiling magmatic-hydrothermal fluids. Electron microprobe major element analyses are presented for magmatic and hydrothermal biotites and amphiboles from both occurences. Hydrothermal biotites in the albitic / potassic zones are more magnesian than their magmatic counterparts and therefore close to phlohopite end - member composition. The amphiboles from Kassiteres range from magnesio - hornblende to actinolite, commonly within the same grain. Moreover the chemical data in both magmatic and hydrothermal biotites and amphiboles from the above two occurences indicate a Mg - and Si - enrichment and a Ti - depletion during crustallization and cooling from magmatic to late magmatic - early hydrothermal conditions. It is likely that an increase in oxyzen fugacity accompanied their chemical evolution. This oxidation trend is associated with the fluid exsolution of the magmas resulting in the development of the studied porphyry type mineralizations. Elements, which are also depleted from Mg - rich (more oxidized) amphiboles and biotites (K, Na, Fe and Ti) are partitioned in the magmatic - hydrothermal fluid phase and are responsible for the albitic / potassic altaration of both occurences.
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Jeffery, A. J., R. Gertisser, R. A. Jackson, B. O'Driscoll, and A. Kronz. "On the compositional variability of dalyite, K2ZrSi6O15: a new occurrence from Terceira, Azores." Mineralogical Magazine 80, no. 4 (June 2016): 547–65. http://dx.doi.org/10.1180/minmag.2016.080.018.
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AbstractThe rare potassium zirconium silicate dalyite has been identified for the first time on Terceira, Azores, within syenitic ejecta of the Caldeira-Castelinho Ignimbrite Formation. New quantitative analyses of this dalyite were combined with the small number of published analyses from various locations worldwide to evaluate the mineral's compositional variability. Additionally, solid-state modelling has been applied to assess the site allocations of substituting elements. The new analyses yield the average formula (K1.84Na0.15)∑=1.99(Zr0.94Ti0.012Hf0.011Fe0.004)∑=0.967Si6.03O15. Model results predict the placement of substituting Hf and Ti in the octahedral site, and highlight the overall complexity in the incorporation of Fe, Mg and Ba. The combined dataset reveals that dalyite found within peralkaline granites and syenites is generally defined by higher Na↔K substitution and lower Ti↔Zr substitution relative to dalyite from highly potassic rocks. The Terceira dalyite exhibits a bimodal variation in the degree of Na↔K substitution which is attributed to a K-enrichment trend induced by late-stage pore wall crystallization and albitization, coupled with the control of pore size upon the degree of supersaturation required to initiate nucleation of dalyite in pores of varying size.
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AKAL, CÜNEYT. "K-richterite–olivine–phlogopite–diopside–sanidine lamproites from the Afyon volcanic province, Turkey." Geological Magazine 145, no. 4 (April 24, 2008): 570–85. http://dx.doi.org/10.1017/s0016756808004536.
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AbstractMiddle Miocene volcanic activity in the Afyon volcanic province (eastern part of Western Anatolia) is characterized by multistage potassic and ultrapotassic alkaline volcanic successions. The volcanism is generally related to the northward subduction of the African plate beneath the Eurasian Plate. In Afyon, the Middle Miocene volcanic products consist of melilite leucitite, tephriphonolite, trachyte, basaltic–trachyandesite, phonolite, phonotephrite, tephriphonolite and lamproite rocks. Near-surface emplacement and relatively quiescent subaerial eruptions of lamproitic magma produced different emplacement forms such as dome/plug-shaped bodies and lava flows, showing variation in volume and texture. The mineralogical constituents of the lamproites are sanidine, olivine (77 < Mg no. < 81), phlogopite (74 < Mg no. < 78), K-richterite, clinopyroxene (74 < Mg no. < 78), with accessory apatite, calcite and opaque minerals. Afyon lamproites resemble Mediterranean-type Si-rich lamproites. Their compositional range is 50–52 wt% SiO2, 4–8 wt% MgO, and they display a typical lamproitic affinity. Chondrite-normalized REE patterns exhibit enrichment in LREE relative to HREE ((La/Yb)CN=15.3–17.0). They show extreme enrichment in LILE relative to primitive mantle values and troughs of Nb and Ti. The lamproites give a range of high initial87Sr/86Sr ratios and low143Nd/144Nd ratios. The geochemical and isotopic characteristics suggest that lamproitic magma is derived from highly metasomatized mantle. The enrichment history may include metasomatic events related to subduction, as in other active orogenic areas of the Mediterranean.
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Rogers, N. W., C. J. Hawkesworth, R. J. Parker, and J. S. Marsh. "The geochemistry of potassic lavas from Vulsini, central Italy and implications for mantle enrichment processes beneath the Roman region." Contributions to Mineralogy and Petrology 90, no. 2-3 (July 1985): 244–57. http://dx.doi.org/10.1007/bf00378265.
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do Nascimento, Aline C., Davis C. de Oliveira, Luciano R. da Silva, and Raquel Sacramento. "Magnetic Petrology of Crust- and Mantle-Derived Mesoarchean Ourilândia Granitoids, Carajás Mineral Province, Brazil." Canadian Mineralogist 60, no. 4 (July 1, 2022): 597–624. http://dx.doi.org/10.3749/canmin.2100026.
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ABSTRACT This paper presents a detailed study of magnetic petrology in crust- and mantle-derived Mesoarchean granitoids (2.92–2.88 Ga) from the Ourilândia do Norte area, which is situated in the midwestern Carajás Mineral Province, southeastern Amazonian Craton (northern Brazil). The textural aspects of opaque minerals and their relation to magnetic susceptibility (MS) were combined with the results of previous works that involve whole-rock geochemistry and mineral chemistry data to discuss the formation conditions and to correlate the MS values and opaque mineral content with the crustal input related to the source of these rocks. The Ourilândia granitoids can be divided into the following three lithological associations: (1) potassic granites represented by biotite monzogranites and high-Ti granodiorites, which both host tonalite-trondhjemite-granodiorite (TTG) affinity tonalitic xenoliths; (2) sanukitoids formed by granodiorites (equi- to heterogranular and porphyritic), with minor occurrences of tonalite, quartz monzodiorite, quartz diorite, and mafic microgranular enclaves; and (3) TTG-affinity porphyritic trondhjemite, which is represented by a small, slightly deformed stock. The cumulative frequency curve from the MS data defines three main magnetic populations as follows: (1) population A is characterized by low MS values (0.05 × 10–3 to 0.59 × 10–3 SI) formed by sanukitoid and trondhjemite rocks, which contain rare opaque minerals; (2) population B is defined by moderate MS values (0.70 × 10–3 to 1.24 × 10–3 SI) wherein sanukitoids predominate over the potassic granites while ilmenite prevails in relation to magnetite; (3) population C is represented by high MS values (1.33 × 10–3 to 17.0 × 10–3 SI) in which potassic granites and high-Ti granodiorites are predominant, in addition to the porphyritic and heterogranular sanukitoids. The Fe/(Fe + Mg) ratios in whole rock, biotite, and amphibole indicate high redox conditions for the sanukitoids and potassic granites, which are mostly above the nickel-nickel oxide (NNO) buffer (+0.5 < NNO < +1.9) and at or slightly below the NNO for the TTG-affinity trondhjemite (–0.5 < NNO < +1.0). The variation in the opaque mineral content (especially magnetite) explains in the first instance the magnetic behavior of these rocks. Furthermore, our results not only suggest that the oxidation states recorded in these granitoids are associated with the nature of their sources, but also suggest that unlike the depleted mantle (reduced in nature), the continental crust (monzogranite source) and subcontinental lithospheric mantle (the source of the sanukitoids and high-Ti granodiorite) are oxidized, while the oceanic crust (trondhjemite source) is moderately oxidized. The low MS values and the scarcity of magnetite reported for the equigranular sanukitoids and trondhjemite can be attributed to the variations in crustal input (crustal anatexis and/or mantle enrichment) in magmas that can change the overall fO2 and thereby promote differences in the Fe-Ti oxide mineral assemblage. The frequent presence of magnetite and high MS in the porphyritic sanukitoid reinforces the differences in the enrichment degree of their source in relation to other sanukitoids. The Ourilândia granitoids provided temperatures between 959 and 738 °C, with a higher water content in the sanukitoids (>5%) than in the potassic granites (<4%) and TTG-affinity granitoids (<4%). Except for the TTG-affinity trondhjemite, which returned higher emplacement depths (580–263 MPa), the studied granitoids were emplaced under high redox conditions in the upper crust (297–80 MPa). The textural aspects of the Fe-Ti oxide minerals suggest cooling temperatures of 620 to 550 °C, as indicated by the subsolidus textures in magnetite and ilmenite (trellis ilmenite, external and internal composite ilmenite lamellae, and titanite to ilmenite and pyrite to goethite replacement) in the tardi- to postmagmatic stages.
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Farzaneh Farahi, Saeed Taki, and Mojgan Salavati. "Petrogenesis and tectonomagmatic setting of gabbroic rocks in the Gisel area (northern Iran)." Journal of Pharmaceutical Negative Results 13, no. 4 (October 10, 2022): 583–92. http://dx.doi.org/10.47750/pnr.2022.13.04.077.
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The Alborz-Azerbaijan magmatic zone in northern Iran is one of the important zones of magmatic activity in the Cenozoic. Lithologically, this complex consists of olivine gabbro, monzogabbro, dolerite, and gabbro with granular, intergranular, and porphyritic textures. The main phenocrysts of these rocks are clinopyroxene, plagioclase, and sometimes iddingsitized olivine. The rocks producing magma has potassic and shoshonitic nature. Enrichment in large-ion lithophile elements (LILEs), i.e., Ba, Rb, and Th, and depletion of high-field strength elements (HFSEs), i.e., Ti and Nb, in the spider diagrams are of the characteristics of subduction and active continental margin rocks. Also, these diagrams show enrichment in the light rare earth elements (LREEs) compared to heavy rare earth elements (HREEs). This feature also is representative of the rocks of subduction zones and active continental margins. The geochemical and petrogenetic studies indicate unique origin of the intrusive rocks in the study area and the role of fractional crystallization with simultaneous crustal assimilation (AFC) and magma contamination with crustal rocks in the evolution of the magma forming these rocks. This magma is obtained from the low-degree partial melting of an enriched mantle source beneath the continental lithosphere with garnet lherzolite composition at a depth of 100 to 110 km in a post-collision extensional basin.
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Förster, Michael W., Stephan Buhre, Bo Xu, Dejan Prelević, Regina Mertz-Kraus, and Stephen F. Foley. "Two-Stage Origin of K-Enrichment in Ultrapotassic Magmatism Simulated by Melting of Experimentally Metasomatized Mantle." Minerals 10, no. 1 (December 31, 2019): 41. http://dx.doi.org/10.3390/min10010041.
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The generation of strongly potassic melts in the mantle requires the presence of phlogopite in the melting assemblage, while isotopic and trace element analyses of ultrapotassic rocks frequently indicate the involvement of subducted crustal lithologies in the source. However, phlogopite-free experiments that focus on melting of sedimentary rocks and subsequent hybridization with mantle rocks at pressures of 1–3 GPa have not successfully produced melts with K2O >5 wt%–6 wt%, while ultrapotassic igneous rocks reach up to 12 wt% K2O. Accordingly, a two-stage process that enriches K2O and increases K/Na in intermediary assemblages in the source prior to ultrapotassic magmatism seems likely. Here, we simulate this two-stage formation of ultrapotassic magmas using an experimental approach that involves re-melting of parts of an experimental product in a second experiment. In the first stage, reaction experiments containing layered sediment and dunite produced a modally metasomatized reaction zone at the border of a depleted peridotite. For the second-stage experiment, the metasomatized dunite was separated from the residue of the sedimentary rock and transferred to a smaller capsule, and melts were produced with 8 wt%–8.5 wt% K2O and K/Na of 6–7. This is the first time that extremely K-enriched ultrapotassic melts have been generated experimentally from sediments at low pressure applicable to a post-collisional setting.
Dissertations / Theses on the topic "Potassic enrichment"
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Schenck, Charles. "Pollution saline de l'eau souterraine et de l'air liee aux activites economiques en haute alsace : incidences agronomiques." Université Louis Pasteur (Strasbourg) (1971-2008), 1987. http://www.theses.fr/1987STR13220.
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De par ses caracteristiques physiques, la vallee de l'ill en haute alsace est particulierement sensible a la pollution. Dans cette region a vocation industrielle et agricole la contazmination du milieu se traduit par une forte mineralisation de l'eau souterraine et des retombees atmospheriques solubles, diluees mais acides. La composition naturelle: bicarbonatee calcique de l'eau de la nappe phreatique est modifiee par une charge chloro-sodique et nitrique non negligeable. Quant aux retombees, elles provoquent au sol, des apports d'elements mineraux parmis lesquels predominent les chlorures, les sulfates, les nitrates, le calcium, le potassium et le sodium
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Redden, G. "Textural and compositional variation of tuff marker beds at the Mount Isa and George Fisher deposits; implications for origin and mineralisation." Thesis, 2018. https://hdl.handle.net/2440/133459.
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This item is only available electronically.World-class resources of Cu, Pb and Zn are deposited at Mount Isa Mines and George Fisher Mine, North West Queensland, hosted within the Urquhart Shale unit (1655 Ma) of the Proterozoic Mount Isa Inlier. Numerous beds of tuffaceous metasediments are also intercalated within the carbonaceous units and have been relied on for constraining sequence stratigraphy. Tuff Marker Beds (TMBs) are described as cherty beds with cross-fractures at a high angle to bedding, and as having a highly potassic composition (Croxford, 1964). They provide the only indication of proximal volcanism associated with sedimentation; a line of evidence used to support a syngenetic sedimentary exhalative model of ore formation. The origin of potassic enrichment has previously been interpreted to be related to the composition of the original detrital sediments (including possible ash-fall tephra) and an unconstrained hydrothermal or diagenetic component. TMB samples for this study, collected from Mount Isa Copper Operations (MICO) and George Fisher Mine (GFM), indicate potassic enrichment is not confined to TMBs. Additionally, characteristic fining-upwards sequences were not observed, which is consistent with the interpretation that some of the potassic enrichment is a hydrothermal alteration product, formed either as part of the diagenesis or from later mineralisation-related fluid events. TMB mineralogical and geochemical compositions are closely related to base metal sulphide mineralisation with textural evidence of several episodes of fluid migration, including potassic enrichment. Results indicate that the K-feldspar rich beds identified at MICO are not genuine air-fall tuffs. Textural investigations of mineralised TMBs support a post-sedimentation and deformation paragenesis of ore emplacement of the Urquhart Shale, providing further evidence for an epigenetic Cu and Pb-Zn mode of ore formation at Mount Isa and George Fisher. It is proposed that TMBs record volcanogenic sedimentation and provide a record of potassic and mineralisation-related alteration events but are unrelated to ore genesis.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2018
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Hoyos, Juan C. "Effects of CO₂ enrichment and potassium supply on growth and inorganic nutrition of chrysanthemum (Dendranthema grandiflora Tzvelev)." Thesis, 1992. http://hdl.handle.net/2429/2581.
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Beyond the effects of photosynthesis, plant responses to CO₂ enrichment are modified by secondary environmental factors and internal processes, including mineral relations and carbon partitioning. Leaf abnormalities sometimes develop under long-term CO₂ enrichment, and previous research has correlated them with altered nutrient requirements and distribution.
To explore the roles of CO₂ enrichment on the development of leaf abnormalities, three experiments were performed on chrysanthemum (Dendranthema grandiflora Tzvelev) plants cv 'Envy'. CO₂ enrichment and K+ supply effects on growth, carbon partitioning, and the inorganic nutrient contents in plants were studied.
CO₂ enrichment increased plant dry mass, mainly due to increased leaf dry mass. In CO₂ enriched plants, increased leaf area of branch leaves resulted in an increase in total leaf area. There was no significant further increase above 1200A L L⁻¹ CO₂. Leaf starch concentration was increased by CO₂ enrichment, although there was no evidence of excessive starch accumulation. CO₂ enrichment did not have a significant effect on the leaf concentrations of sucrose, glucose, fructose or protein. Total leaf content of inorganic nutrients was not changed by CO₂ enrichment. CO₂ enrichment decreased the starch-corrected concentrations of some nutrients in leaves borne on main stems. That change was significant for K, Ca and Mn, and also for the ratio of Mn to Zn. In leaves borne on the lower part of branches, CO₂ enrichment induced a slight reduction in N concentration. Interactions between CO₂ enrichment and K supply on the nutrient relations of plants were seldom detected.
Increasing K limited leaf dry mass accumulation and leaf area production, reduced nutrient concentrations, and induced leaf chlorosis. The interpretation of K effects was restricted by the possible detrimental effect of acetic acid. This negative effect was probably enhanced by daily drifts in the pH of nutrient solutions. Both acetic acid additions and the size of pH drifts increased with increasing K supply. A possible beneficial effect of Na, when K supply was low, further confounded the interpretation of K supply effects.
Interveinal chlorosis appeared on both the upper most leaves of main stems and the lower leaves borne on branches, after one week of CO₂ enrichment. It was more pronounced in the latter. Leaf chlorosis decreased toward the bottom of main stems, and toward the top of branches. Increasing K supply enhanced chlorosis in both CO₂ enriched and unenriched plants. No relationship was detected between leaf chlorosis and leaf starch concentration or leaf temperature. Reduced leaf concentration of Mn coupled with alterations in the Mn to Zn ratio, and the appearance and distribution of symptoms, suggest that Mn deficiency played a role in the induction of chlorosis by CO₂ enrichment. However, other nutrients, such as K or N, or non-nutritional factors could be involved in the disorder.
These studies confirmed that CO₂ enrichment reduces leaf nutrient concentration and makes plants more susceptible to nutrient stresses. The importance of inorganic nutrition in the regulation of plant responses to CO₂ enrichment was also verified.
Book chapters on the topic "Potassic enrichment"
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Müller, Daniel, and David I. Groves. "Primary Enrichment of Precious Metals in Potassic Igneous Rocks." In Potassic Igneous Rocks and Associated Gold-Copper Mineralization, 77–96. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-23051-1_5.
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Müller, Daniel, and David I. Groves. "Primary Enrichment of Precious Metals in Potassic Igneous Rocks." In Potassic Igneous Rocks and Associated Gold-Copper Mineralization, 63–82. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-662-00920-8_5.
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Müller, Daniel, and David I. Groves. "Primary Enrichment of Precious Metals in Potassic Igneous Rocks." In Potassic Igneous Rocks and Associated Gold-Copper Mineralization, 67–86. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-642-59665-0_5.
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Müller, Daniel, and David I. Groves. "Primary Enrichment of Precious Metals in Potassic Igneous Rocks." In Potassic Igneous Rocks and Associated Gold-Copper Mineralization, 101–25. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-92979-8_5.
Full textConference papers on the topic "Potassic enrichment"
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Salam, Abdul Kadir, N. Sriyani, S. K. Dewi, and M. Utomo. "The soil available-potassium enrichment by several potential tropical weeds." In THE 5th INTERNATIONAL CONFERENCE ON AGRICULTURE AND LIFE SCIENCE 2021 (ICALS 2021): “Accelerating Transformation in Industrial Agriculture Through Sciences Implementation”. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0116362.
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Goncharenko, О. P., and I. L. Lashina. "ENVIRONMENT OF POTASSIUM-MAGNESIUM SALT FORMATION IN THE UPPERPERMIAN KALININGRAD-GDANSK BLOCK OF THE CENTRAL EUROPEAN HALOGEN BASIN (FROMEXAMINATIONOFINCLUSIONSINMINERALS)." In Проблемы минералогии, петрографии и металлогении. Научные чтения памяти П. Н. Чирвинского. Пермский государственный национальный исследовательский университет, 2021. http://dx.doi.org/10.17072/chirvinsky.2021.25.
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Examination of inclusions in minerals makes the basis for analyzing the peculiarities of salt crystallizationin the Kaliningrad-Gdansk halogen block of the Central- European evaporite basin. Most of the studied sections are composed of fine – medium- grained rock made of halite impregnated with polyhalite, kieserite, carnallite and kainite. Threesystemsofmicro-inclusionsmaybedistinguishedamongthe wide diversity of inclusions: 1) inclusions of mineral-forming mediums; 2) inclusions of surrounding mediums; 3) solid inclusions captured by minerals during their growth from marine solutions. Thedead-endpositionofthestudybasinaccounts for the solutions enrichment in potassium and magnesium arriving from the neighboring German-Polish halogen- bearing areas. Theinflowingbrinewas desalinated by continental waters enriched in calcium and sulfate ions. Thisusedtoresultincreating conditions for polyhalite precipitation. Thepresenceofflatboat-shapedstructuresin halite and in kainite grains is most probably indicative of surficial crystallization of potassium and potassium-magnesium minerals. Carnalliteandbischofiteimpregnationsarerecordedinhalite, whichis indicative of theeutonicstagein the basin development and of manifestations of bottom crystallization of minerals and, accordingly, of the brine probable stratification. Therefore, at the moment of crystallization of potassium and potassium-magnesium minerals, the basin was peculiar foravailabilityoftwo-layeredbrine.
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Karklina, Ilze, Zaiga Anna Zvaigzne, and Jelena Stola. "Chemical properties of needles as an indicator of nutrient status of fertilized coniferous stands." In Research for Rural Development 2020. Latvia University of Life Sciences and Technologies, 2020. http://dx.doi.org/10.22616/rrd.26.2020.012.
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Enhanced forest growth may respond to demand of woody resources and contribute to the climate change mitigation. Forest soil treatment with fertilizers, as well as drainage and thinning enhance forest growth. The analysis of needles is an established method in forest science to identify the nutrient status in the forest stand and need for forest soil enrichment with fertilizers. The aim of this research is to estimate the efficiency of forest soil enrichment with wood ash and ammonium nitrate in order to eliminate nutrient deficiency in forest stands. Forest soil was enriched with wood ash fertilizer or ammonium nitrate in 2016–2017. The current year needles were collected from fertilized and control plots, from three trees in each plot. The samples were collected in the period 2018–2019. Total nitrogen (g kg-1), calcium (g kg-1), magnesium (g kg-1), and potassium (g kg-1) were analyzed in the collected samples. The chemical properties of collected needles were compared at the individual object level to estimate the impact of fertilizer on forest stand. A statistically significant increase in the concentrations of potassium and phosphorus was detected in some plots treated with wood ash and ammonium nitrate. In addition, a correlation analysis conducted between the variables of chemical properties of needles and soil showed few significant correlations between nutrient content in needles and in soil samples.
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Di´ez, Luis I., Cristo´bal Corte´s, Mariano Berdusa´n, and Eduardo Ferrer. "Ash Fouling Under Co-Firing in a Pulverized Fuel Combustion Rig." In ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95748.
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Co-firing of coal and biomass in existing coal-fired power stations is a cost-effective method to reduce CO2 emissions in energy generation. Nevertheless, the introduction of biomass has to be carefully considered since it could significantly modify combustion and heat transfer phenomena and enhance fouling and corrosion inside the boiler. This paper investigates the effect of substituting a fraction of coal by biomass on the heat transfer and ash deposition rates, by performing pilot tests under different operating conditions in a pulverized fuel combustion rig. Fouling rates have been characterized by means of air-cooled deposition probes installed at one tube bank, reproducing the performance of a large-scale superheater. Heat transfer has been simulated coupling thermal radiation models with semi-empirical approaches for the tube bank behaviour. Ash samples compiled from the wind- and the lee-side of the probe has been collected and analysed by SEM (Scanning Electron Microscopy). Low-to-moderate fouling rates have been typically observed for the tested coal and coal + biomass blends, but with somewhat potassium enrichment at the lee-side deposits when biomass is introduced. As a matter of fact, sootblowing manoeuvres in utility boilers should not be affected when co-firing the tested fuels. Furthermore, chlorine-induced corrosion on heat transfer surfaces is not expected to be significant since the concentration of chlorine in the sampled deposits has been always found to be negligible.
Reports on the topic "Potassic enrichment"
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Shtienberg, Dan, William Fry, Amos Dinoor, Thomas Zitter, and Uzi Kafkafi. Reduction in Pesticide Use in Plant Disease Control by Integration of Chemical and Non-Chemical Factors. United States Department of Agriculture, May 1995. http://dx.doi.org/10.32747/1995.7613027.bard.
Full textAbstract:
The long term goal of this research project was to improve control efficiency of Alternaria diseases while reducing fungicide use, by integration of chemical and non-chemical factors. Non-chemical factors were genotype resistance, age-related resistance and fertilizers. The Specific objectives were: 1) To quantify changes in resistance among genotypes and over time in terms of disease development and specific phases of the disease cycle; 2) To quantify the effects of fertilizers applied to the foliage alone, or in combination with a fungicide, on disease development; 3) To quantify the relative contribution of genotype resistance, age-related resistance and fungicide type to the reduction of disease development; 4) To develop a strategy for integration of chemical and non-chemical factors which will achieve optimal disease suppression. The influence of physiological age of cotton plants and of the individual leaves, on disease incidence and on the rate of lesion expansion of A. macrospora was examined on leaves sampled from the field. Both parameters increased with the physiological age of individual leaves but were not affected by the age of the whole plant. The hypothesis that enrichment of the foliage with nitrogen and potassium may enhance host resistance to Alternaria and thus reduce disease severity, was examined for potato and tomato (A. solani ) and for cotton (A. macrospora ). Under controlled environment conditions, application of urea or KNO3 resulted in some reduction in disease development; however, foliar application of both nutrients (8-10 sprays in total) did not affect Alternaria severity in the field. Systemic fungicides against Alternaria (e.g. , tebuconazole and difenoconazole) are more effective than the commonly used protectant fungicides (e.g. mancozeb and chlorothalonil). Concepts for the integration of genotype resistance, age-related resistances and fungicide for the suppression of Alternaria diseases were developed and evaluated. It was found that reduction in host resistance, with age and among genotypes, can be compensated for by adjusting the intensity of fungicide applications, i.e. by increasing the frequency of sprays and by spraying systemic fungicides towards the end of the season. In, moderately resistant cultivars protection can be achieved by spraying at longer intervals than susceptible cultivars. The concepts for integration were evaluated in field trials for cotton, potatoes and tomatoes. By following these concepts it was possible to save up to five sprays out of 8-10 in a growing season.