Thesis (M.S.)--University of Wisconsin--Madison, 1970. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis - Univ. of Washington. / Vita. Includes bibliographical references.

No description available.

No description available.

Th. univ.--Orléans, 1996. / Bibliogr. p. 279-292. Résumé en français et en anglais.

Th. 3e cycle--Agro-éco-pédol.--Nancy--I.N.P.L., 1979.

Orientador: Edivaldo Domingues Velini / Banca: Carlos Gilberto Raetano / Banca: Dagoberto Martins / Resumo: Este trabalho teve como objetivo estudar o efeito do tamanho do alvo e condições operacionais sobre a uniformidade de deposição de pulverizações em pré-emergência. Duas barras pulverizadoras de mesmo modelo (12 m e espaçamento entre bicos de 0,5 m) sendo uma para cada tipo de bico.Dois tipos de bicos (jato cônico modelo JA- 1,5 e jato plano modelo API 110-02) testados com uma mesma velocidade de aplicação (4km/h). Para o preparo das caldas de pulverização foram utilizados: água, nitrato de potássio, nitrato de cálcio, sulfato de cobre e sulfato de zinco. Os alvos foram construídos de chapa de fórmica, que foram cortadas em placas quadradas com tamanho de 13 x 13 cm. Ao centro de 602 placas foram feitos orifícios de diversos tamanhos de diâmetro: 10,16 cm, 5,8 cm, 2,54 cm, 1,27 cm, 0,63 cm e 0,32 cm. Para cada tamanho de orifício foram feitas 117 repetições. Totalizando 702 placas. Os alvos foram posicionados no piso do terreno de maneira aleatória. Depois da pulverização, estes foram lavados com 25 ml de água deionizada, dando origem as amostras. Estas, depois de filtradas, foram analisadas em espectrofotômetro de plasma. As leituras de concentrações foram transformadas em volume ( l), e este divido pela área de cada círculo correspondente, resultando em dados de depósito em l/cm2. Os dados de depósitos foram transformados em % da média, e realizado os cálculos de freqüências acumuladas para cada tamanho de alvo. O modelo de Gompertz (y = e **(a-e**(-b-c*x))) foi utilizado para ajustar os dados e efetuar as análises de regressão, obtendo os valores de R2 (0,985 a 0,997) e um novo valor de freqüência acumulada para cada curva. Calculou-se os valores de média, mediana, moda, os percentis 1, 2, 5, 10, 20, 40, 60, 80, 90, 95, 98 e 99.e os coeficientes de variação para todos os diferentes tamanhos de alvo para os respectivos bicos... (Resumo completo, clicar acesso eletrônico abaixo). / Abstract: It were studied two types of nozzles. The first one is a conic jet nozzle model JÁ 1,5. The second type is a flat fan nozzle model API 110-02. The application speed was 4km/h. It were used two similar sprayers set with boons 12 m wide and nozzles spaced by 0,5m. The spray solution for the fan jet nozzle was prepared with water, potassium nitrate and copper sulfate. For the conic jet nozzle theses salts were replaced by calcium nitrate and zinc sulfate. The targets were made of formica foils cut into square plates of 13 cm x 13 cm. One hundred of these plates were used to estimate the drift. In all the other 702 plates (117 replications for each type of target) it were made central circular holes of different diameters: 10,16 cm, 5,8 cm, 2,54 cm, 1,27 cm, 0,63 cm and 0,32 cm. The targets were randomly arranged on the ground. After spraying and drying the spray solution, each target was washed with 25 ml of de-ionized water. These water samples were filtered and analyzed in plasma spectrophotometer. The concentrations of the tracers in the final volume of 25 mL allowed to calculate the deposits of both spray solutions (in L/cmø) in each target. These data were converted in to percent of the means for each nozzle type and target size. Frequency distribution curves were fitted to the data. The Gompertz (y=e**(a-e**(-b-c*x))) model provided the highest determination coefficients, ranging from 0,985 and 0,997. In addition to the Relative Standard Deviation (RSD%) it were estimated the values of the mean, the median, the mode and the 1, 2, 5, 10, 20, 40, 60, 80, 90, 95, 98 and 99 percents, using the frequency distribution curves. Among the central tendency measures, the mode, the median and the 1, 2, 5, 10, 20, 40, 60, 80, 90, 95, 98 and 99 percents allowed more precise comparisons of spray deposits of different nozzles in targets of several sizes; the mean is very sensitive... (Complete abstract, click electronic address below). / Mestre

In the present study, two strains of Ectocarpus siliculosus with different pollution histories, LIA4 and Es524, were exposed to three PSII inhibitor herbicides, diuron (DIU), terbuthylazine (TBA) and isoproturon (IPU). Evaluation of their effects on growth and photosynthetic efficiency (Fv/Fm, ΦPSII, qP) have demonstrated negative impacts of all herbicides on both strains. With reference to the 7 d RGR EC50 values; DIU (9.9 - 25 μg L-1); TBA (18 – 28 μg L-1); IPU (257 – 315 μg L-1), the reported environmental concentrations for DIU were higher than the values that exert negative effects to E. siliculosus. However, as for TBA and IPU, the environmental concentrations were below the values which caused detrimental effects to E. siliculosus. Strain Es524, which originated from a Cu-polluted site in Chile, was found to exhibit greater resistance to the herbicides, with higher EC50 values recorded, compared to LIA4. To further elucidate the factors contributing to the relative tolerances of the two strains, responses associated with reactive oxygen species (ROS) were investigated. Measurements of H2O2 concentrations and lipid peroxidation showed significant differences between the strains, with increases in both parameters recorded at lower concentrations in LIA4 than Es524. Activities of antioxidant enzymes (CAT, APX and GR) were significantly (P < 0.05) greater in Es524 than LIA4, and total phenolic content and DPPH scavenging activity were also greater in the more tolerant strain. The rank order of toxicity of the three herbicides was diuron > terbuthylazine > isoproturon in both strains of E. siliculosus. In addition to exposure to individual herbicides, the interactions between binary mixtures were also investigated in both strains using physiological and biochemical biomarkers. All three ways of action (synergistic,additive and antagonistic) were exhibited through different endpoints applied in the present study. Significant differences (P < 0.05) between LIA4 and Es524 were observed for the DIU+TBA and TBA+IPU mixtures, while higher impacts were recorded in LIA4 strain compared to Es524. Further studies showed synergistic interactions were observed in Es524 for the aforementioned mixtures (DIU+TBA, TBA+IPU) on the antioxidative enzyme activities while in LIA4 different interactions were exhibited, which probably contribute to the higher tolerance of Es524 to the mixtures. The presence of TBA together with the phenylureas DIU/IPU was also observed to increase the stimulation of antioxidative enzymes (CAT, APX, GR) in both strains of E. siliculosus. This investigation provides new information on the abiotic stress metabolism in brown algae, and HPLC analysis demonstrates the important role of polyphenols in overcoming the impact of oxidative stress. In conclusion, exposure to the herbicides, singly and in mixtures, caused significant (P < 0.05) changes in the growth, photosynthetic efficiency, and ROM of both strains of E. siliculosus. Strain Es524 was found to be more tolerant than LIA4.

Orientador: Edson Lazarini / Banca: Salatiér Buzetti / Banca: Luiz Carlos Ferreira de Souza / Resumo: No contexto das grandes culturas produtoras de grãos, a soja foi a que mais cresceu em termos percentuais nos últimos 37 anos, tanto no Brasil quanto em nível mundial. O presente trabalho teve por objetivo verificar se há diferença entre variedades de soja transgênica e não transgênica quanto ao desenvolvimento vegetativo e reprodutivo através do acúmulo de matéria seca na parte aérea e dos teores de macronutrientes na matéria seca produzida, quando estas são submetidas à presença de herbicidas específicos para o controle de plantas daninhas. O experimento foi realizado na Fazenda de Ensino, Pesquisa e Extensão da Faculdade de Engenharia/UNESP - Campus de Ilha Solteira, localizada no município de Selvíria - MS. Os tratamentos foram compostos de duas variedades de soja transgênica (BRS Valiosa RR e BRS Favorita RR) e duas variedades convencionais (MGBR 46 - Conquista e MGBR 68 - Vencedora), com controle de plantas daninhas através de uso de herbicidas ou capinas. A semeadura da soja ocorreu no dia 20/11/2009, em um espaçamento de 0,45 m entrelinhas e 15 sementes por metro de sulco. O delineamento experimental utilizado foi o em blocos casualizados com 4 repetições, apresentando as parcelas, 7 linhas com 50 m de comprimento. Avaliaram-se as características agronômicas como: altura de inserção da primeira vagem; altura de plantas; número de ramos por planta; número de vagens por planta; população de plantas; produtividade de grãos; massa de 1000 grãos no estádio R8 da cultura. Também foi avaliado em amostragens quinzenais a partir do 21o dias após a germinação, a matéria seca de folhas, caules, vagens e grãos e o teor de macronutrientes nesta e o estado nutricional das plantas, através de amostragem foliar, no florescimento pleno. Os resultados obtidos perm itiram concluir que: aos 81 dias após emergência, quando as plantas encontram -se no... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: In the context of major grain-producing crops, soybean was grown the most in percentage terms over the past 37 years, both in Brazil and worldw ide. This study aimed to observe the differences between varieties of GM and non GM soya on the vegetative and reproductive development through the dry matter accumulation in shoots and macronutrient content in dry matter yield when they are subjected to t he presence of herbicides for weed control. The experiment was conducted at Faculdade de Engenharia/UNESP - Ilha Solteira, located in Selvíria county. The treatments consisted of two transgenic soybeans varieties (BRS Favorita and BRS Valiosa) and two conventional varieties (MGBR 46 - Conquista and MGBR 68 - Vencedora), with control of weeds through the use of herbicides or weeding. The sowing of soybean was performed in 11/20/2009, at a spacing of 0.45 m between rows and 15 seeds per meter of furrow. The experimental design was a randomized block with 4 replicates, with plots at seven lines to fifty meter long. We evaluated the agronomic characteristics such as height of first pod, plant height, number of branches per plant, number of pods per plant, plant population, yield, 1000 grain weight of the R8 stage of culture. Was also assessed in biweekly samples from the 21 th day after germination, the dry matter of leaves, stems, pods and grains and content of macronutrients and nutritional status of this plant, by sampling leaves in full bloom. The results showed that: at 81 days after emergence, when plants are in the initial stage R5, it is gotten the highest total dry matter in transgenic and conventional varieties of soybeans, there is a greater concentration of N, P and K in the grains as they are approaching maturity, contrary to that observed for stems, leaves and pods, there is a significant... (Complete abstract click electronic access below) / Mestre

Made available in DSpace on 2014-06-11T19:29:41Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-09-02Bitstream added on 2014-06-13T20:19:50Z : No. of bitstreams: 1 oliveira_jag_me_ilha.pdf: 1190345 bytes, checksum: 504c267fff22f154d98acce9d50bee89 (MD5) / No contexto das grandes culturas produtoras de grãos, a soja foi a que mais cresceu em termos percentuais nos últimos 37 anos, tanto no Brasil quanto em nível mundial. O presente trabalho teve por objetivo verificar se há diferença entre variedades de soja transgênica e não transgênica quanto ao desenvolvimento vegetativo e reprodutivo através do acúmulo de matéria seca na parte aérea e dos teores de macronutrientes na matéria seca produzida, quando estas são submetidas à presença de herbicidas específicos para o controle de plantas daninhas. O experimento foi realizado na Fazenda de Ensino, Pesquisa e Extensão da Faculdade de Engenharia/UNESP - Campus de Ilha Solteira, localizada no município de Selvíria – MS. Os tratamentos foram compostos de duas variedades de soja transgênica (BRS Valiosa RR e BRS Favorita RR) e duas variedades convencionais (MGBR 46 – Conquista e MGBR 68 – Vencedora), com controle de plantas daninhas através de uso de herbicidas ou capinas. A semeadura da soja ocorreu no dia 20/11/2009, em um espaçamento de 0,45 m entrelinhas e 15 sementes por metro de sulco. O delineamento experimental utilizado foi o em blocos casualizados com 4 repetições, apresentando as parcelas, 7 linhas com 50 m de comprimento. Avaliaram-se as características agronômicas como: altura de inserção da primeira vagem; altura de plantas; número de ramos por planta; número de vagens por planta; população de plantas; produtividade de grãos; massa de 1000 grãos no estádio R8 da cultura. Também foi avaliado em amostragens quinzenais a partir do 21o dias após a germinação, a matéria seca de folhas, caules, vagens e grãos e o teor de macronutrientes nesta e o estado nutricional das plantas, através de amostragem foliar, no florescimento pleno. Os resultados obtidos perm itiram concluir que: aos 81 dias após emergência, quando as plantas encontram -se no... / In the context of major grain-producing crops, soybean was grown the most in percentage terms over the past 37 years, both in Brazil and worldw ide. This study aimed to observe the differences between varieties of GM and non GM soya on the vegetative and reproductive development through the dry matter accumulation in shoots and macronutrient content in dry matter yield when they are subjected to t he presence of herbicides for weed control. The experiment was conducted at Faculdade de Engenharia/UNESP – Ilha Solteira, located in Selvíria county. The treatments consisted of two transgenic soybeans varieties (BRS Favorita and BRS Valiosa) and two conventional varieties (MGBR 46 - Conquista and MGBR 68 - Vencedora), with control of weeds through the use of herbicides or weeding. The sowing of soybean was performed in 11/20/2009, at a spacing of 0.45 m between rows and 15 seeds per meter of furrow. The experimental design was a randomized block with 4 replicates, with plots at seven lines to fifty meter long. We evaluated the agronomic characteristics such as height of first pod, plant height, number of branches per plant, number of pods per plant, plant population, yield, 1000 grain weight of the R8 stage of culture. Was also assessed in biweekly samples from the 21 th day after germination, the dry matter of leaves, stems, pods and grains and content of macronutrients and nutritional status of this plant, by sampling leaves in full bloom. The results showed that: at 81 days after emergence, when plants are in the initial stage R5, it is gotten the highest total dry matter in transgenic and conventional varieties of soybeans, there is a greater concentration of N, P and K in the grains as they are approaching maturity, contrary to that observed for stems, leaves and pods, there is a significant... (Complete abstract click electronic access below)