Made available in DSpace on 2014-06-11T19:28:29Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-06-30Bitstream added on 2014-06-13T19:37:05Z : No. of bitstreams: 1 bachega_lps_me_jabo.pdf: 586643 bytes, checksum: 0204b73a016c82b09faff210c7f4a653 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / O presente trabalho foi conduzido com o objetivo de se determinar os períodos de interferência das plantas daninhas na cultura do quiabo cv. “Santa Cruz 47” e seus efeitos no acúmulo de macronutrientes da cultura. Os tratamentos consistiram em períodos crescentes de convivência e controle das plantas daninhas: aos 7, 14, 21, 28, 35, 42, 49, 63, 77, 91 e 105 dias após a emergência (DAE), totalizando vinte e dois tratamentos, dispostos em blocos casualizados, com três repetições cada. As principais espécies de plantas daninhas responsáveis pela interferência na cultura foram Portulaca oleracea, Eleusine indica e Nicandra physaloide. A convivência do quiabeiro com as plantas daninhas por todo o ciclo de cultivo reduziu a produtividade da cultura em 95%. O período anterior à interferência foi de 57 DAE, enquanto o período total de prevenção à interferência foi de 14 DAE. Não houve período crítico de prevenção à interferência, sendo que um único controle das plantas daninhas entre 14 e 57 DAE é suficiente para prevenir a interferência na cultura do quiabo. A competição com plantas daninhas reduziu drasticamente o acúmulo de matéria seca pela cultura, assim como o acúmulo de macronutrientes / The experiment was carried out to determine the critical periods of interference of the weeds on the okra crop cv. “Santa Cruz 47” and the effects on macronutrients uptake. The treatments were weedy and weed-free increased weekly periods: at 7, 14, 21, 28, 35, 42, 49, 63, 77, 91 and 105 days after emergence (DAE), totaling twenty two treatments, arranged in a randomized block design, with three replications. The main weed species responsible for interference in culture were Portulaca oleracea, Eleusine indica and Nicandra physaloides. Coexistence of okra crop and weeds throughout the season reduced crop yield by 95%. Period before interference was 57 DAE, while total period of interference prevention was 14 DAE. There was no critical period of interference prevention, so that a single weed control between 14 and 57 DAE is sufficient for interference prevention in okra crop. The competition with weeds reduced the dry matter accumulation in culture, as well as the accumulation of nutrients

Submitted by (lucia.rodrigues@ufrpe.br) on 2017-03-10T15:46:17Z No. of bitstreams: 1 Frederick Mendes Aguiar.pdf: 412210 bytes, checksum: 4f5f91c02dea9d844bac53a51c2cafa0 (MD5) / Made available in DSpace on 2017-03-10T15:46:17Z (GMT). No. of bitstreams: 1 Frederick Mendes Aguiar.pdf: 412210 bytes, checksum: 4f5f91c02dea9d844bac53a51c2cafa0 (MD5) Previous issue date: 2011-02-24 / Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq / Okra is a vegetable crop with high nutritional value, being a rich source of vitamins and mineral salts. Fusarium wilt (caused by Fusarium oxysporum f. sp. vasinfectum – FOV) is one of the major field diseases of okra in tropical areas. In the present work, 53 okra accessions and the commercial cultivar Santa Cruz 47 were evaluated aiming to identify sources of resistance to Brazilian FOV isolates and to study the resistance stability of the selected accessions to different pathogen isolates. An initial screening was carried out with only one FOV isolate (Fus-194). In the second assay, thirty-three accessions identified in the first screening were re-evaluated in two assays (in two different seasons) using two FOV isolates (Fus-194 and Fus-201). The resistance evaluation was carried out with 21 day-old plantlets, using the root-dipping inoculation procedure, utilizing a spore suspension of 1x106 conidia/mL. The evaluation was done using a disease severity grade system with grades ranging from 0 to 4. These grades were used to generate a disease index that was employed for clustering the accessions according to their reaction to FOV. In the evaluation carried out in August (average temperature of 19,8°C) only 12 out the 32 accessions (i.e. 37%) were rated as having high to intermediate resistant response to Fus-194 isolate. Only 28% of the accessions were classified within the high to intermediate resistance cluster when using the Fus-201 isolate. In the assay carried out in October (higher temperatures) 72% of the accessions were classified as resistant and intermediate resistant to Fus-194 isolate, whereas 32% were resistant to isolate Fus-201. Our results indicated that the Fus-201 isolate was more aggressive than Fus-194. Comparative analysis of the assays indicated that the overall aggressiveness of the isolates was higher in August than in October assay. The accessions BR-2399 and BR-1449 as well as the commercial cultivar Santa Cruz 47 were the most promising accessions displaying higher levels of stable resistance against the two Brazilian FOV isolates.Okra is a vegetable crop with high nutritional value, being a rich source of vitamins and mineral salts. Fusarium wilt (caused by Fusarium oxysporum f. sp. vasinfectum – FOV) is one of the major field diseases of okra in tropical areas. In the present work, 53 okra accessions and the commercial cultivar Santa Cruz 47 were evaluated aiming to identify sources of resistance to Brazilian FOV isolates and to study the resistance stability of the selected accessions to different pathogen isolates. An initial screening was carried out with only one FOV isolate (Fus-194). In the second assay, thirty-three accessions identified in the first screening were re-evaluated in two assays (in two different seasons) using two FOV isolates (Fus-194 and Fus-201). The resistance evaluation was carried out with 21 day-old plantlets, using the root-dipping inoculation procedure, utilizing a spore suspension of 1x106 conidia/mL. The evaluation was done using a disease severity grade system with grades ranging from 0 to 4. These grades were used to generate a disease index that was employed for clustering the accessions according to their reaction to FOV. In the evaluation carried out in August (average temperature of 19,8°C) only 12 out the 32 accessions (i.e. 37%) were rated as having high to intermediate resistant response to Fus-194 isolate. Only 28% of the accessions were classified within the high to intermediate resistance cluster when using the Fus-201 isolate. In the assay carried out in October (higher temperatures) 72% of the accessions were classified as resistant and intermediate resistant to Fus-194 isolate, whereas 32% were resistant to isolate Fus-201. Our results indicated that the Fus-201 isolate was more aggressive than Fus-194. Comparative analysis of the assays indicated that the overall aggressiveness of the isolates was higher in August than in October assay. The accessions BR-2399 and BR-1449 as well as the commercial cultivar Santa Cruz 47 were the most promising accessions displaying higher levels of stable resistance against the two Brazilian FOV isolates. / O quiabo é uma hortaliça de alto valor alimentício e uma importante fonte de vitaminas e sais minerais. Dentre os problemas fitossanitários que ocorrem no quiabeiro, a murcha-de-fusário, causada pelo fungo Fusarium oxysporum f. sp. vasinfectum (FOV) é uma das mais importantes por proporcionar grandes perdas na produção. Este trabalho objetivou avaliar, em condições de casa de vegetação, a cultivar comercial Santa Cruz 47 e uma coleção de 53 acessos de quiabeiro, visando identificar fontes de resistência a FOV e analisar a estabilidade da resistência de acessos promissores a diferentes isolados do patógeno. Inicialmente foi conduzida uma triagem utilizando um único isolado de FOV (Fus-194). Em uma segunda etapa, trinta e dois acessos obtidos na primeira etapa, foram reavaliados para resistência ao FOV utilizando dois isolados (Fus-194 e Fus-201), em duas épocas do ano. A inoculação foi realizada em mudas com 21 dias após semeadura, pela imersão das raízes em suspensão de conídios (1x106 conídios/mL) do patógeno. A avaliação da severidade da doença foi realizada usando uma escala de notas, variando de 0 a 4. As notas foram transformadas em índice de doença (ID) e agrupadas em classes de acordo com a reação da doença. Na segunda etapa do trabalho realizado no mês de agosto de 2010 (temperatura média de 19,8°C), dos 32 acessos avaliados, 12 (37%) foram considerados altamente resistentes a medianamente resistentes ao Fus-194. Para o isolado Fus-201 apenas 28% foram classificados dentro dessas duas classes. No ensaio realizado no mês de outubro (temperatura média de 25°C) referente à segunda etapa desse trabalho, 72% dos acessos foram considerados medianamente a altamente resistentes ao Fus-194. Neste ensaio, 32% dos acessos foram resistentes ao isolado Fus-201. Os resultados demonstraram uma maior agressividade do isolado Fus-201 em relação ao isolado Fus-194. Os níveis de agressividade dos isolados testados foram maiores no ensaio realizado no mês de agosto do que em outubro. Os acessos BR-2399, BR-1449 e a cultivar Santa Cruz 47 apresentaram resistência estável aos dois isolados do patógeno tanto na etapa preliminar, quanto nas duas épocas de avaliação da segunda etapa do trabalho.

Submitted by Jorge Silva (jorgelmsilva@ufrrj.br) on 2017-09-21T17:43:12Z No. of bitstreams: 1 2013 - Felipe Latini de Oliveira.pdf: 634634 bytes, checksum: eea400d37e0548a7475eeece7ce8bfe7 (MD5) / Made available in DSpace on 2017-09-21T17:43:12Z (GMT). No. of bitstreams: 1 2013 - Felipe Latini de Oliveira.pdf: 634634 bytes, checksum: eea400d37e0548a7475eeece7ce8bfe7 (MD5) Previous issue date: 2013-03-25 / This work aimed to study an organic production system of okra, grown during autumn-winter period, at the conditions of Fluminense Lowland. It was evaluated the effect of leaf spraying with liquid biofertilizer, obtained by fermented compost extract, and of dressing organic fertilization, in order to increase income for farmers of the region. The treatment were: okra (cv. Santa Cruz 47) sprayed or not with liquid biofertilizer, subjected to two doses of organic fertilization with castor cake (equivalent to 100 and 200 Kg of N-total ha-l), which were applied monthly or bimonthly, and started at 30 days after sowing. Okra was sown at double rows, with a spacing of 0.80 m inside the double row and 1.60 m between the double rows. Fruits were harvested with the size of 10 to 14 cm, according to the preference of national market. There were evaluated weight and number of produced fruits, as well as the yield estimated by the results of dry weight of fruits. Cv. Santa Cruz 47 is adapted to organic management, with mean yield of 16 Mg.ha-1. There were not detected significant differences among the evaluated treatments. This result indicates that the utilization of biofertilizer and the dressing fertilization applied monthly, in relation to bimonthly application, did not promote benefits to okra, according to the evaluated parameters. Considering edaphoclimatic conditions, the organic cultivation of okra in the autumn-winter period is viable, showing possibility to increase the income for farmers of the region. / Com objetivo de obter resultados que proporcionem alternativas vi?veis de incremento na renda dos agricultores, o presente trabalho estudou um sistema de produ??o org?nica do quiabeiro, cultivado nas esta??es de outono-inverno nas condi??es da Baixada Fluminense, avaliando-se o efeito da pulveriza??o foliar com biofertilizante l?quido, obtido a base de extrato de composto fermentado, e da aduba??o org?nica de cobertura, de forma a possibilitar uma oportunidade de renda aos agricultores da regi?o. Os tratamentos consistiram de: quiabeiro (cv. Santa Cruz 47) pulverizado ou n?o com biofertilizante l?quido, e submetidos a duas doses de aduba??o org?nica, com torta de mamona, (equivalentes a 100 e 200 Kg de N-tota.ha-l) com aplica??o mensal e bimensal, iniciada ap?s 30 dias da semeadura. A cultura foi disposta em fileiras duplas, adotando-se um espa?amento de 0,80 m dentro da fileira dupla e de 1,60 m entre as fileiras duplas. Os frutos foram colhidos ao atingirem a faixa de 10 a 14 cm, padr?o preconizado por mercados exigentes em ?mbito nacional. Foram considerados, nas avalia??es, par?metros de produtividade, como o peso e o n?mero de frutos produzidos, sendo a produtividade estimada a partir dos resultados de peso seco dos frutos.. A Cultivar Santa Cruz 47 mostrou-se adaptada ao manejo org?nico, com produtividade m?dia pr?xima de 16 Mg.ha-1. N?o foram detectadas diferen?as devido aos tratamentos avaliados. Desse modo, a utiliza??o do biofertilizante n?o surtiu qualquer efeito ben?fico ? cultura, tendo em vista as vari?veis quantificadas, assim como a aduba??o mensal em cobertura da torta de mamona, n?o acarretou benef?cio superior ao obtido com a aplica??o bimensal. Considerando as condi??es edafoclim?ticas, o cultivo org?nico do quiabeiro no per?odo de outono inverno mostrou-se vi?vel, o que evidencia possibilidades de gera??o de renda para os agricultores da regi?o.