published_or_final_version / Radioisotope / Master / Master of Science

Multi-element stream sediment reconnaissance in the Hess River region of the Eastern Yukon has outlined an extensive area characterized by anomalously high molybdenum values. An accessible region in the Hess Mountains, within the high molybdenum zone, was selected for detailed study of trace element levels in stream sediment, rock, soil and vegetation. In view of the frequently observed relationship between high forage molybdenum concentrations and the incidence of copper deficiency in cattle, molybdenum concentrations in plant species likely to be consumed by caribou and moose were of particular interest. High sediment molybdenum values are characteristic of catchments underlain by dark shales and less commonly dark limestone. These rocks and associated soils are rich in molybdenum. Concentrations in vegetation growing on anomalous shaly soils are characteristically low, while most plants growing on soils derived predominantly from limestone are molybdenum-rich. The Mo-Cu status of vegetation on limey soils is typically within the range associated with molybdenum induced hypocuprosis in cattle. Low molybdenum uptake by plants on soils derived from shales likely reflects the unavailability of the molybdate anion, resulting from its adsorption onto clay minerals and sesquioxides under acidic conditions prevalent in these soils. In neutral to mildly basic environments, typical of dark limestone soils, molybdenum adsorption is greatly decreased, and therefore molybdenum is relatively available to plants. In the detailed study area soil pH values are typically similar to pH levels in associated stream water. Therefore by combining stream sediment molybdenum concentrations with stream pH data, catchments likely to contain molybdenum-rich vegetation can be predicted. Unfortunately stream pH values were not obtained in the regional survey. In view of the apparent rarity of dark limestone throughout the Eastern Yukon, however, molybdenum-rich vegetation is not likely to be particularily widespread. Wildlife in this area, therefore, is probably not significantly affected by molybdenum induced copper deficiency. / Science, Faculty of / Earth, Ocean and Atmospheric Sciences, Department of / Graduate

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Made available in DSpace on 2015-07-13T12:10:18Z (GMT). No. of bitstreams: 0 Previous issue date: 2015-01-30. Added 1 bitstream(s) on 2015-07-13T12:25:26Z : No. of bitstreams: 1 000835450.pdf: 690946 bytes, checksum: 7e32980e44ef5e92c0826d5259c9d13a (MD5) / Estudos tem mostrado a importância do uso de molibdênio (Mo) na cultua da soja, tendo este micronutriente grande importância no processo de fixação simbiótica do nitrogênio, principalmente por fazer parte da enzima nitrogenase, que é responsável pelo fornecimento de nitrogênio para as plantas de soja. Assim o objetivo do trabalho foi produzir sementes de soja enriquecidas com diferentes doses de Mo e verificar o comportamento destas sementes quanto à qualidade fisiológica e nutricional, além de utilizar estas sementes de soja enriquecida com molibdênio para a semeadura na próxima safra, e analisar seu comportamento quanto à presença e ausência de molibdênio no início da cultura. O experimento foi desenvolvido na Fazenda de Ensino, Pesquisa e Extensão/UNESP - Campus de Ilha Solteira, localizada no município de Selvíria - MS, em um Latossolo Vermelho distrófico de textura argilosa. O experimento foi realizado em dois anos, sendo o cultivar utilizado BRS Valiosa RR. No primeiro ano foram utilizadas três doses de molibdênio (0, 400 e 800 g ha -1 de Mo), com quatro repetições, aplicadas via foliar, metade da dose nos estádios R 3 e outra metade em R 6 . No segundo ano as sementes obtidas no primeiro ano foram semeadas para formação de dois experimentos conduzidos paralelamente, sendo que um experimento foi realizado em blocos casualizados com esquema fatorial 3x3, com três métodos de aplicação (sem aplicação de molibdênio, aplicação de molibdênio no momento da semeadura na dose de 25 g ha -1 de Mo, e aplicação via foliar no estádio V 4 na dose de 25 g ha -1 de Mo) e sementes com três teores de Mo obtidas no ano anterior. O segundo experimento foi em blocos casualizados em esquema fatorial 4 x 4 x 3 (épocas de aplicação x doses x sementes com teores de Mo diferentes), com quatro repetições. As quatro épocas de aplicação foram: V4, no pré florescimento, em R3... / Studies have shown the importance of using molybdenum (Mo) in soybean worships taking this micronutrient great importance in the nitrogen fixation process, especially for being part of the nitrogenase enzyme, which is responsible for supplying nitrogen to the soybean plants. The objective of this study was to produce soybean seeds enriched with different doses of Mo and verify the behavior of these seeds by physiological and nutritional quality, and using these soybeans enriched with molybdenum for sowing next season, and analyze their behavior for the presence or absence of molybdenum at the beginning of the crop. The experiment was conducted at Experimental Station belongs to UNESP - Ilha Solteira, located in Selvíria - MS, in a clayey Oxisol. The experiment was conducted in two years using BRS Valiosa RR cultivar. The first year was used three molybdenum doses (0, 400 and 800 g ha -1 ), with four replicates, applied to the leaves, half the dose in stages R3 and the other half in R6 stage. In the second year the seeds obtained in the first year were sown for the formation of two experiments conducted in parallel. The first experiment was conducted in a randomized block design in a x3 factorial scheme: three application methods (without application of molybdenum, molybdenum application at the time of seeding in a dose of 25 g ha -1 Mo, and foliar application at V4 stage in a dose of 25 g ha -1 Mo) and seeds with three Mo contents obtained in the previous year. To second experiment was used a randomized block design in a factorial scheme 4 x 4 x 3: 4 application times x 4 doses of Mo x seeds with 3 different Mo content, with four replications. The application times were: V4 stage, pre flowering, R3 and R5 stage, and the doses: 0, 25, 50 and 100 g ha -1 Mo, and seeds with three levels of Mo obtained in the previous year. There enrichment of seeds already in the first year at a dose of 400 g ha -1 ...

Orientador: Marco Estáquio de Sá / Co-orientador: Edson Lazarini / Banca: Marcelo Carvalho Minhoto Teixeira Filho / Banca: Gisele Herbst Vazquez / Resumo: Estudos tem mostrado a importância do uso de molibdênio (Mo) na cultua da soja, tendo este micronutriente grande importância no processo de fixação simbiótica do nitrogênio, principalmente por fazer parte da enzima nitrogenase, que é responsável pelo fornecimento de nitrogênio para as plantas de soja. Assim o objetivo do trabalho foi produzir sementes de soja enriquecidas com diferentes doses de Mo e verificar o comportamento destas sementes quanto à qualidade fisiológica e nutricional, além de utilizar estas sementes de soja enriquecida com molibdênio para a semeadura na próxima safra, e analisar seu comportamento quanto à presença e ausência de molibdênio no início da cultura. O experimento foi desenvolvido na Fazenda de Ensino, Pesquisa e Extensão/UNESP - Campus de Ilha Solteira, localizada no município de Selvíria - MS, em um Latossolo Vermelho distrófico de textura argilosa. O experimento foi realizado em dois anos, sendo o cultivar utilizado BRS Valiosa RR. No primeiro ano foram utilizadas três doses de molibdênio (0, 400 e 800 g ha -1 de Mo), com quatro repetições, aplicadas via foliar, metade da dose nos estádios R 3 e outra metade em R 6 . No segundo ano as sementes obtidas no primeiro ano foram semeadas para formação de dois experimentos conduzidos paralelamente, sendo que um experimento foi realizado em blocos casualizados com esquema fatorial 3x3, com três métodos de aplicação (sem aplicação de molibdênio, aplicação de molibdênio no momento da semeadura na dose de 25 g ha -1 de Mo, e aplicação via foliar no estádio V 4 na dose de 25 g ha -1 de Mo) e sementes com três teores de Mo obtidas no ano anterior. O segundo experimento foi em blocos casualizados em esquema fatorial 4 x 4 x 3 (épocas de aplicação x doses x sementes com teores de Mo diferentes), com quatro repetições. As quatro épocas de aplicação foram: V4, no pré florescimento, em R3... / Abstract: Studies have shown the importance of using molybdenum (Mo) in soybean worships taking this micronutrient great importance in the nitrogen fixation process, especially for being part of the nitrogenase enzyme, which is responsible for supplying nitrogen to the soybean plants. The objective of this study was to produce soybean seeds enriched with different doses of Mo and verify the behavior of these seeds by physiological and nutritional quality, and using these soybeans enriched with molybdenum for sowing next season, and analyze their behavior for the presence or absence of molybdenum at the beginning of the crop. The experiment was conducted at Experimental Station belongs to UNESP - Ilha Solteira, located in Selvíria - MS, in a clayey Oxisol. The experiment was conducted in two years using BRS Valiosa RR cultivar. The first year was used three molybdenum doses (0, 400 and 800 g ha -1 ), with four replicates, applied to the leaves, half the dose in stages R3 and the other half in R6 stage. In the second year the seeds obtained in the first year were sown for the formation of two experiments conducted in parallel. The first experiment was conducted in a randomized block design in a x3 factorial scheme: three application methods (without application of molybdenum, molybdenum application at the time of seeding in a dose of 25 g ha -1 Mo, and foliar application at V4 stage in a dose of 25 g ha -1 Mo) and seeds with three Mo contents obtained in the previous year. To second experiment was used a randomized block design in a factorial scheme 4 x 4 x 3: 4 application times x 4 doses of Mo x seeds with 3 different Mo content, with four replications. The application times were: V4 stage, pre flowering, R3 and R5 stage, and the doses: 0, 25, 50 and 100 g ha -1 Mo, and seeds with three levels of Mo obtained in the previous year. There enrichment of seeds already in the first year at a dose of 400 g ha -1 ... / Mestre

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Legume establishment is difficult on many moderately acid, infertile soils in the humid northeastern United States. Legume seedling vigor as influence by P, S, and Mo fertilization was studied in order to determine fertilizer needs for improved establishment. A Gilpin silt loam was fertilized with 0, 22, 67, and 201 mg P kg⁻¹ in combination with 0, 22, 67, and 201 μg Mo kg⁻¹ in a greenhouse experiment in 1983. Legumes studied in this experiment were red clover (<i>Trifolium pratense</i>), white clover (<i>T. repens</i>), and birdsfoot trefoil (<i>Lotus corniculatus</i>). Field experiments with red clover, birdsfoot trefoil, and flatpea (<i>Lathyrus sylvestris</i>) were initiated in the spring of 1983 and 1984 using 0, 50, 150, and 450 kg P ha⁻¹, 0 and 60 kg S ha⁻¹, and 0 and 874 g Mo ha⁻¹. Seedling vigor as measured by plant height, trifoliate leaf count, dry weight, and trifoliate leaf area increased the greatest in the greenhouse using 22 mg P kg⁻¹ relative to the higher rates of P fertilization. Seedling vigor without applied P was poor, which clearly indicated the essential need for P in the early stages of legume growth. Molybdenum applied at 201 μg kg⁻¹ increased the growth of the greenhouse grown legumes the greatest above the 0 μg Mo kg⁻¹ rate within each added P treatment. Seedling vigor however, was not enhanced with Mo fertilization until the P deficiency was corrected. Field established legumes increased in height and dry matter yield the most using 50 kg P ha⁻¹ with respect to the additional increments of applied P, but the increase was not as great as that obtained in the greenhouse using 22 mg P kg⁻¹, This was attributed to a higher extractable P level before fertilization within the field experiments. Sulfur fertilization generally did not enhance seedling vigor in the field studies; although, red clover yield was increased using 60 kg S ha⁻¹ in the 1984 field experiment, Molybdenum applied at 874 g ha⁻¹ increased seedling vigor as measured by plant height and yield in the field experiments with or without P or S fertilization. Phosphorus uptake and Mo concentrations were increased in the plant tissues with either P or Mo fertilization. / Master of Science / incomplete_metadata