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Ministry of Agriculture

GovernmentRio de Janeiro, Brazil
About: Ministry of Agriculture is a government organization based out in Rio de Janeiro, Brazil. It is known for research contribution in the topics: Chemistry & Salmonella. The organization has 1153 authors who have published 1189 publications receiving 14442 citations.


Papers
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Journal ArticleDOI
TL;DR: Study about establishment and persistence of fungal conidia in soil, using the colony forming unity (CFU) counts, indicated that the fungus persisted in the soil between two rice crop seasons, up to 216 days after application, when new rice crops were established.
Abstract: The rice stem bug, Tibraca limbativentris Stal, 1860 (Heteroptera: Pentatomidae), is an important pest of rice (Oryza sativa L.) in Brazil, mainly in flooded system of cultivation. The effect of two ways of application (conidia in aqueous suspension and on rice grain) of Metarhizium anisopliae strain 172 for the control of the rice stem bug, was evaluated in three experiments conducted in 1991, 1992 and 1994 in commercial irrigated rice. In 1991, the spraying of conidia suspension and manual distribution of rice grain covered with fungal material at dose of 7.2 x 10(13) conidia.ha-1, on soil and among rice stems, where the bugs were located, reduced significantly the insect natural population with control efficiencies of 52.6 and 61.8%, respectively. Studies about establishment and persistence of fungal conidia in soil, using the colony forming unity (CFU) counts, indicated that the fungus persisted in the soil between two rice crop seasons, up to 216 days after application, when new rice crops were established. The number of CFU was greater in the plots treated with rice grain covered with fungal material. The linear growth of CFU in the control plots showed that the fungus spread to the untreated areas of the rice field. Significant control efficiency was obtained in 1993 for grain and aqueous fungus treatment with 48.2% and 51.8%, respectively. In 1994, the conidial suspension at dose of 5x10(13) conidia.ha-1 resulted in control efficiency of 39.5%. The level of insect mycosis, however, was low in both 1993 and 1994, reaching a maximum of 20% mycosis in 1993. The low numbers of insect with mycosis compared with the level of mortality, may probably reduce the rate of fungal dissemination in rice fields and, consequently, be detrimental to the occurrence of epizootics.

21 citations

Journal ArticleDOI
TL;DR: A caracterizacao micromorfologica de perfis de solos dispostos em topossequencias in areas of rochas do Pre-Cambriano na regiao semi-arida do Brazil, ha poucas informacoes disponiveis sobre a micromoricia and a genese desses solos as mentioned in this paper.
Abstract: Apesar da ocorrencia comum de Luvissolos e Planossolos nas areas de rochas do Pre-Cambriano na regiao semi-arida do Brasil, ha poucas informacoes disponiveis sobre a micromorfologia e a genese desses solos. Objetivou-se com este trabalho realizar a caracterizacao micromorfologica de perfis de solos dispostos em topossequencias nas quais os Luvissolos sao os principais componentes e, com isso, gerar informacoes para subsidiar a interpretacao da sua genese. Doze perfis de solos, sendo 10 de Luvissolos e dois de Planossolos, distribuidos em quatro topossequencias, foram selecionados em areas semi-aridas dos Estados de Pernambuco e da Paraiba. Amostras indeformadas foram coletadas de horizontes selecionados, impregnadas, cortadas e polidas para confeccao das secoes delgadas, que foram analisadas sob microscopio petrografico. A descricao das amostras indicou que nao ha evidencias micromorfologicas que sustentem que a argiluviacao tenha sido um processo efetivo na formacao do gradiente textural dos solos estudados. A remocao preferencial (erosao diferencial) da argila dos horizontes superficiais e apontada como o principal processo atuante na formacao do gradiente textural encontrado na maioria dos solos estudados. As principais pedofeicoes observadas estao relacionadas ao intemperismo dos minerais primarios, notadamente da biotita, a dinâmica de formacao e dissolucao dos compostos de Fe e a reorganizacao da massa do solo em funcao das mudancas de umidade do solo decorrentes das alternâncias entre periodos secos e chuvosos.

21 citations

Journal ArticleDOI
TL;DR: In this paper, it was shown that metallo-oxinates have a remarkable resistance to the action of 3N hydrochloric acid, whereas all other oxinates dissolve immediately.

21 citations

Journal ArticleDOI
TL;DR: In this article, the authors comprehensively reviewed and evaluated the effects of iron-based additive on dark fermentation (DF) and discussed potential mechanisms, including altering metabolic pathways, improving activities of microbes and enzymes, promoting electron delivery, and enriching hydrogen-producing bacteria.

21 citations

Journal ArticleDOI
TL;DR: The sera from 100 ovines from Uruguaiana and Brazil, slaughtered in Braganca Paulista, were examined for the presence of antibodies against Toxoplasma gondii using the Sabin-Feldman dye test and the prevalence of this zoonosis was 39%.
Abstract: The sera from 100 ovines from Uruguaiana (Rio Grande do Sul, Brazil), slaughtered in Braganca Paulista (S. Paulo, Brazil), were examined for the presence of antibodies against Toxoplasma gondii using the Sabin-Feldman dye test. Considering positive those sera with titer ³16, the prevalence of this zoonosis was 39% with titers and percentages of seropositivity of: 16 (66.7%), 64 (23%), 256 (2.6%), 1024 (5.1%) and 4000 (2.6%).

20 citations


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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20238
202253
202157
202063
201951
201874