Abstract There are no records of autochthonous cases of canine visceral leishmaniasis in the city of Curitiba, Paraná state, Brazil. In 2020, a male French bulldog (CW01), approximately 2 years old was taken by its owners to a private veterinarian clinic. The suspicion of CVL was confirmed by means of a serology test (ELISA/IFAT reagent), rapid chromatographic immunoassay (DPP®) (ELISA - Biomanguinhos®), parasitological culture and quantitative polymerase chain reaction (qPCR). The animal routinely frequented parks in Curitiba and was taken on several trips to the municipalities of Bombinhas and Balneário Camboriú (Santa Catarina) and to Matinhos (Paraná) where CVL had not previously been reported. Treatment was initiated orally with Milteforan™ which resulted in a significant reduction in the parasitic load. The suspicion of autochthony was investigated through entomological research. A total of 10 traps were installed, one at the animal’s home, seven in adjacent city blocks and two in a forest edge. No sandflies were trapped in the dog’s home and adjacent houses. The traps in the forest edge caught one Migonemyia migonei female and five Brumptomyia spp. females. This case serves as a warning of the possible introduction of CVL in the city of Curitiba.

Resumo Não há registros de casos autóctones de leishmaniose visceral canina (LVC) no município de Curitiba, Paraná, Brasil. Em 2020, um "bulldog" francês macho (CW01), com aproximadamente 2 anos de idade, foi levado por seus donos a uma clínica veterinária particular. A suspeita de LVC foi confirmada por meio de teste sorológico (reagente ELISA/IFAT), imunoensaio cromatográfico rápido (DPP®) (ELISA - Biomanguinhos®), cultura parasitológica e reação quantitativa em cadeia da polimerase (qPCR). O animal frequentava, rotineiramente, parques de Curitiba e foi levado em diversas viagens para Bombinhas e Balneário Camboriú (Santa Catarina) e para Matinhos (Paraná), onde a LVC não havia sido relatada anteriormente. O tratamento foi iniciado por via oral com Milteforan™ (Virbac) o que resultou em redução significativa da carga parasitária. A suspeita de autóctone foi investigada por meio de pesquisa entomológica. Foram instaladas 10 armadilhas, uma na casa do animal, sete em quarteirões adjacentes e duas na borda da mata. Nenhum inseto foi capturado na casa do proprietário do animal e nas casas adjacentes. As armadilhas na borda da mata capturaram uma fêmea de Migonemyia migonei e cinco Brumptomyia spp. fêmeas. Este caso serve de alerta para a possível introdução da LVC na cidade de Curitiba.

ABSTRACT Construction waste (CW) is currently one of the biggest problems in urban areas, and the proper management of this material is a challenge for most Brazilian municipalities. In this context, intermunicipal consortia emerge as an alternative for project feasibility, based on the principle that the search for partnerships can be a more attractive and economical option. Thus, this work aimed to evaluate the economic viability of three different scenarios for the implementation of CW management and recycling infrastructures for the formation of an intermunicipal consortium in the municipalities belonging to the Baixo Pardo/Grande Watershed (UGRHI 12). Through visits and interviews with public managers, it was found that none of the municipalities of UGRHI 12 has adequate infrastructure for the management of generated construction waste. Economic feasibility analyses showed that sharing a CW recycling plant, a transshipment and sorting area, and a landfill, without showing the most advantageous scenario, resulting in an TIR of 78.79% and a VPL of R$ 29,094,983.16, and a payback of 1 year and 7 months. However, in the three scenarios analyzed, it was found that the shared management of construction waste can be viable and profitable, and can bring cost reduction and scale gain.

RESUMO Os resíduos da construção civil (RCC) constituem atualmente um dos maiores problemas das áreas urbanas, sendo a gestão adequada desse material um desafio para grande parte dos municípios brasileiros. Nesse contexto, os consórcios intermunicipais surgem como uma alternativa de viabilização de projetos, com base no princípio de que a busca de parcerias pode ser uma opção mais atrativa e econômica. Dessa forma, este trabalho teve como objetivo avaliar a viabilidade econômica de três cenários diferentes para a implantação de infraestruturas de gerenciamento e reciclagem de RCC para formação de um consórcio intermunicipal nos municípios pertencentes à Bacia Hidrográfica do Baixo Pardo/Grande (UGRHI 12). Por meio das visitas e entrevistas com gestores públicos, constatou-se que nenhum dos municípios da UGRHI 12 possui infraestrutura adequada para o gerenciamento dos RCC gerados. As análises de viabilidade econômica mostraram que o compartilhamento de uma usina de reciclagem de RCC, uma área de transbordo e triagem e um aterro se mostrou o cenário mais vantajoso, resultando em uma taxa interna de retorno de 78,79%, um valor presente líquido de R$ 29.094.983,16 e payback de um ano e sete meses. Entretanto, nos três cenários analisados, viu-se que a gestão compartilhada dos RCC pode ser viável e lucrativa, podendo trazer redução de custos e ganho de escala.

RESUMO Objetivo: Traduzir para o português brasileiro e realizar adaptação transcultural do questionário “Injury Report Form for Rugby Union”. Métodos: Estudo transversal, nível de evidência II, etapas seguidas: tradução; síntese; retrotradução; revisão pelo comitê de especialistas e versão pré-final; pré-teste para verificar a compreensão; elaboração da versão final do instrumento e aplicação clínica. Resultados: No processo de tradução e adaptação as duas versões não apresentaram grandes diferenças entre si. A versão pré-final foi preenchida por 23 jogadores de rugby do sexo masculino, três questões não foram compreendidas por 40%, 27% e 82,5% dos jogadores, respectivamente, convocando-se nova reunião com o comitê multidisciplinar de especialistas. As modificações foram realizadas, sendo necessária nova aplicação. A nova versão foi preenchida por 25 jogadores de rugby do sexo masculino, com idade entre 29,44± 5,90 anos; sendo que 56% possuíam nível de escolaridade superior completo; finalizando o processo de adaptação transcultural. Conclusão: O questionário “Formulário para Notificação/Avaliação de Lesão em Jogadores de Rugby” foi traduzido e adaptado transculturalmente para o português brasileiro. Nível de Evidência II, Estudos diagnósticos - Investigação de um exame para diagnóstico.

ABSTRACT Objective: To translate into Brazilian Portuguese and conduct the cross-cultural adaptation of the “Injury Report Form for Rugby Union” questionnaire. Methods: This is a cross-sectional study, level of evidence II, with following the steps: translation; synthesis; back-translation; review by a committee of experts and pre-final version; pre-test to verify comprehension; elaboration of the final version of the instrument and clinical application. Results: The two versions resulting from the translation and adaptation process did not show great differences. The pre-final version was filled by 23 male rugby players; three questions were not understood by 40%, 27% and 82.5% of the players, respectively, which required a new meeting with a multidisciplinary committee of experts. The modifications were made, requiring then a new application. The new version was filled by 25 male rugby players, aged 29.44 ± 5.90 years; of which 56% had complete higher education; finalizing the process of cross-cultural adaptation. Conclusion: The questionnaire “Formulário para Notificação/Avaliação de Lesão em Jogadores de Rugby” was translated and transculturally adapted into Brazilian Portuguese. Level of Evidence II, Diagnostic Studies - Investigating a Diagnostic Test.

THE USE OF HYBRID OR NANOCOMPOSITE MATERIALS AS STEEL ANTICORROSIVE COATINGS. The search had as the goal to present and reflect the hybrid materials as an alternative for anticorrosive coatings of metallic surfaces, such as steel. For comparison purposes, different types of anti-corrosion coatings capable of protecting metallic surfaces, such as steel, from oxidation action were presented. Steel is a metallic material widely used by industry in different types of segments, and its corrosion is a pathology responsible for its functional loss, causing losses in its use. Through a qualitative, bibliographic and exploratory research, based on academic works, it was presented that hybrid materials or nanocomposites prove to be efficient as anticorrosive coatings capable of protecting steel against oxidation.

Resumo: O objetivo deste trabalho foi avaliar os efeitos dos fertilizantes nitrogenados na dinâmica do N e na produtividade de arroz (Oryza sativa) inundado em áreas úmidas tropicais Brasileiras. O experimento foi realizado em delineamento de blocos ao acaso, com seis tratamentos: ureia comum e protegida; doses de N (30, 70 e 150 kg há-1) em cobertura; e controle, sem fertilização com N. Foram quantificados emissões de N-N2O, potencial de aquecimento global (pGWP), fatores de emissão (EF) para fertilizantes minerais, rendimento de grãos, intensidade de emissão, nitrato, amônio, pH e potencial redox. As amostragens foram realizadas em duas safras e na entressafra do arroz. Durante o período de inundação das duas safras, os fluxos de N-N2O não excederam 862,41μg m2h1; no período de entressafra, os fluxos variaram de -52,95 a 274,34 μg m-2h-1 N-N2O. Observaram-se picos de emissão consistentes na drenagem do solo, antes da colheita, quando a dose mais alta de ambas as fontes de N foi utilizada, e também no controle na entressafra. A ureia protegida não reduz as emissões de N2O ou EF. O nitrogênio aumenta o rendimento de grãos. A ureia protegida não afeta o pGWP. As concentrações de NO3- e NH4+ no solo não estão relacionadas aos fluxos de N2O.

Abstract: The objective of this work was to evaluate the effects of nitrogen fertilizers on the N dynamics and grain yield in flooded rice (Oryza sativa) cultivation in Brazilian tropical wetland. The experiment was carried out in a randomized complete block design with six treatments, as follows: common and protected urea; topdressing application of N doses (30, 70, and 150 kg ha-1); and one control treatment, without N fertilization. Emissions of N2O-N, global warming potential (pGWP), emission factors (EF) for mineral fertilizers, grain yield, emission intensity, nitrate, ammonium, pH, and potential redox were quantified. Gas sampling was carried out in two crop seasons of rice cultivation and in one off-season. During the flooded period of the two crop seasons, N2O fluxes did not exceed 862.41 μg m-2 h-1 N2O-N; in the off-season, the fluxes varied from -52.95 to 274.34 μg m-2 h-1 N2O-N. Consistent emission peaks were observed in soil draining before harvest, when the highest rate of both N sources was used, and also in the control treatment in the off-season. Protected urea does not reduce N2O emissions or EF. Nitrogen increases the grain yield. Protected urea does not have any effect on the pGWP. The concentrations of NO3- and NH4+ in the soil are not related to N2O fluxes.

RESUMO A migrânea é uma condição dolorosa crônica com fisiopatologia complexa. Apesar de disfunções imunológicas já terem sido ligadas à migrânea, poucas foram as tentativas, na literatura, de se avaliar a possibilidade da rinite alérgica como um fator agravante da migrânea em adultos, tornando a questão ainda não esclarecida. Objetivo Esta pesquisa visou comparar a incapacidade da migrânea em adultos com e sem rinite alérgica. Métodos Este estudo transversal incluiu 118 adultos com migrânea consecutivamente atendidos em uma clínica ambulatorial. Após o exame neurológico usual, os participantes foram avaliados com relação à incapacidade gerada pela cefaleia com o Migraine Disability Assessment (MIDAS), assim como para a presença atual de rinite alérgica, rinoconjuntivite alérgica e rinite alérgica sazonal de acordo com o questionário do International Study of Asthma and Allergies in Childhood (ISAAC). Resultados Não houve diferença nos escores do MIDAS entre migranosos com e sem alérgica, rinoconjuntivite alérgica e rinite alérgica sazonal. A incapacidade causada pelos sintomas alérgicos também não influenciou os escores do MIDAS dos pacientes com rinite alérgica. A frequência de dias com cefaleia durante os últimos 3 meses foi maior no subgrupo de pacientes sem rinite alérgica (mediana e intervalo interquartil 12 [8–19,2] vs. 8 [4–14]; p = 0,03). Conclusões Os resultados sugerem que rinite alérgica, rinoconjuntivite alérgica e rinite alérgica sazonal não estão relacionadas à incapacidade por cefaleia em pacientes adultos com migrânea episódica.

ABSTRACT Migraine is a chronic condition with complex pathophysiology. Although immunologic disturbances have been linked to migraine, only few attempts have been made to assess the possibility of allergic rhinitis as a worsening factor of migraine in adults. Objective This survey aimed to compare migraine disability between adult migraineurs with and without current allergic rhinitis. Methods This cross-sectional study comprised 118 adult migraineurs who were consecutively assisted at an outpatient clinic. After ordinary neurological evaluation, participants were evaluated for headache disability using the Migraine Disability Assessment (MIDAS). The presence of current allergic rhinitis, allergic rhinoconjunctivitis and seasonal allergic rhinitis was scored for each participant according to the International Study of Asthma and Allergies in questionnaire. Results There was no significant difference between the MIDAS scores of those with current allergic rhinitis, allergic rhinoconjunctivitis, or seasonal allergic rhinitis and nonatopic migraineurs. The disability caused by allergic symptoms also did not influence the MIDAS scores of patients with allergic rhinitis. The frequency of headache days during the last three months was higher in the subset of patients without allergic rhinitis (median and interquartile range 12 [8–19.2] vs. 8 [4–14]; p = 0.03). Conclusions Our results suggest that current allergic rhinitis, allergic rhinoconjunctivitis, and seasonal allergic rhinitis are not related to headache disability in adults with episodic migraine.

Abstract This study aimed to evaluate different concentrations of growth and differentiation factor-9 (GDF-9) on the development and maintenance of equine preantral follicle morphology during short-term in vitro culture. Ovaries (n=5) from five mares were collected from a local slaughterhouse and transported to the laboratory, where nine fragments (5x5x1mm) were procured from each ovary. One fragment from each was immediately fixed and submitted for histological analysis (control group; D0). The other eight fragments were cultured in situ for two (D2) or six (D6) days in MEM+ or MEM+ supplemented with GDF-9 at different concentrations (i.e., 50, 100 and 200 ng/mL the GDF-9). After culturing with different concentrations of GDF-9 for 2 or 6 days, the fragments were processed for histological analysis. After two days of cultivation, we observed an increase in the percentage of developing follicles for 0 (MEM+), 50, 100 and 200 ng/mL GDF-9 compared to control (D0; P<0.05). When we evaluated all treatments that preserved follicular integrity, the GDF-9 concentration of 100 ng/mL presented results superior to those of the other cultures (P<0.05). While, at six days of culture, the concentration of 200 ng/mL of GDF-9 appeared to be more efficient in providing development compared to MEM+ (P<0.05). The percentage of morphologically intact follicles in the 6 days culture samples treated with 50 ng/mL of GDF-9 indicated that this concentration was effective in maintaining the integrity of the follicle (P<0.05). We conclude, therefore, that graduated GDF-9 addition to the medium ensure follicular development and is sufficient maintain the architecture.

BACKGROUND The influence of Plasmodium spp. infection in the health of Southern brown howler monkey, Alouatta guariba clamitans, the main reservoir of malaria in the Atlantic Forest, is still unknown. OBJECTIVES The aim of this study was to investigate the positivity rate of Plasmodium infection in free-living howler monkeys in an Atlantic Forest fragment in Joinville/SC and to associate the infection with clinical, morphometrical, haematological and biochemical alterations. METHODS Molecular diagnosis of Plasmodium infection in the captured monkeys was performed by Nested-polymerase chain reaction (PCR) (18S rRNA and coxI). Haematological and biochemical parameters were compared among infected and uninfected monkeys; clinical and morphometrical parameters were also compared. FINDINGS The positivity rate of Plasmodium infection was 70% among forty captured animals, the highest reported for neotropical primates. None statistical differences were detected in the clinical parameters, and morphometric measures comparing infected and uninfected groups. The main significant alteration was the higher alanine aminotransferase (ALT) levels in infected compared to uninfected monkeys. MAIN CONCLUSIONS Therefore, Plasmodium infection in howler monkeys may causes haematological/biochemical alterations which might suggest hepatic impairment. Moreover, infection must be monitored for the eco-epidemiological surveillance of malaria in the Atlantic Forest and during primate conservation program that involves the animal movement, such as translocations.

Abstract We report an Acanthamoeba keratitis case associated with the use of contact lens in a 28-year-old female from Brasília, Brazil. Samples from corneal scraping and contact lens case were used for culture establishment, PCR amplification, and partial sequencing (fragments of ~400kb) of small subunit rDNA; both culture and PCR were positive. The sequence analyses of the cornea and of isolates from the contact lens case showed similarity with the T4 genotype. To the best of our knowledge, this is the first report of T4 Acanthamoeba keratitis case from the Midwest region of Brazil.

RESUMO No presente estudo avaliou-se a remoção de demanda bioquímica de oxigênio (DBO), nitrogênio total (NT) e fósforo total (PT) da água residuária de suinocultura (ARS) em sistemas alagados construídos (SACs) de escoamento horizontal subsuperficial, além da contribuição das espécies vegetais cultivadas: Polygonum punctatum (erva-de-bicho) e Chrysopogon zizanioides (capim-vetiver). Foram implantados três SACs, utilizando-se argila expandida como meio suporte, sendo um cultivado com P. punctatum (SACE), outro cultivado com C. zizanioides (SACV) e um mantido como controle, sem cultivo (SACC). Para um tempo de retenção hidráulica nominal (τ) de 3,2 dias, observou-se remoção de DBO, NT e PT, ao longo do período experimental, com eficiências médias de 85, 38 e 51% (SACC), 89, 48 e 69% (SACE) e 81, 36 e 45% (SACV), respectivamente. O melhor desempenho foi observado no SACE. Foram obtidas, em termos de matéria seca, produtividades de 2,79 e 1,91 g m-2 d-1 e remoções de NT de 1,54 e 1,01% e de PT de 0,81 e 1,19%, da carga aplicada, para a erva-de-bicho e o capim-vetiver, respectivamente.

ABSTRACT The objective of this study was to evaluate the pollutant removal of swine wastewater in horizontal-flow constructed wetlands (CW) and the contribution of vegetable species Polygonum punctatum (smartweed) and Chrysopogon zizanioides (vetiver grass). Three CW's were implanted with expanded clay as support bed, one cultivated with P. punctatum (CWE), another cultivated with C. zizanioides (CWV) and one without cultivation, used as control (CWC). Using a nominal hydraulic retention time (τ) of 3.21 days, theaverage removal efficiencies of BOD, NT and PT obtained were 85, 38 e 51% (CWC), 89, 48 e 69% (CWE) and 81, 36 e 45% (CWV), respectively. The best performance was observed on CWE. The dry mass productivities were 2.79 and 1.91 g m-2 d-1. NT removals were 1.54 and 1.01% and PT removals were 0.81 and 1.19%, respectively for Polygonum punctatum and Chrysopogon zizanioides .

Abstract This work aimed at introducing the characteristics of the passion fruit cultivar UENF Rio Dourado, developed from three cycles of recurrent selection, to the scientific community. The cultivar presents yield of 25 tons ha-1, mean values of 250 for number of fruits and 175g for fruit weight, providing a percentage increase in yield, number of fruits and fruit weight of 36%, 25% and 3%, respectively, when compared to the standard cultivar tested.

O trabalho objetivou avaliar a biocompatibilidade, a osteocondução e a osseointegração de um compósito pastoso de hidroxiapatita (20%) e lignina (80%) como promotor de integração entre implante metálico e tecido ósseo. Um pino intramedular de Schanz foi implantado em ambas as tíbias de quinze cadelas. Na tíbia esquerda, o pino foi coberto com o biomaterial no momento da cirurgia. A cavidade medular também foi preenchida com o biomaterial. O membro direito não recebeu o biomaterial, constituindo assim o grupo controle. As tíbias foram coletadas de cinco animais aos oito, 60 e 150 dias após a cirurgia, sendo três encaminhadas para avaliação histológica e biomecânica e as duas restantes, para difração de raios X. Os resultados revelaram biocompatibilidade do material, com propriedades de osteocondução e osseointegração. As análises histológicas e os difratogramas mostraram presença da hidroxiapatita no tecido em todos os períodos avaliados, embora a presença de material orgânico de baixa cristalinidade tenha sido variável. Não houve diferença estatística na força necessária para remoção do pino intramedular entre os tempos ou tratamentos. Embora o biomaterial tenha apresentado biocompatibilidade, osteocondutividade e osseointegração, ele não foi capaz de promover uma melhor ancoragem do pino intramedular.

The study aimed to evaluate biocompatibility, osteoconduction and osseointegration of a pasty composite of hydroxyapatite (20%) and lignin (80%) as a promoter of metal implant and bone tissue integration. An intramedullary Schanz pin was implanted in both tibias of fifteen bitches. In the left tibia, the pin was coated with the biomaterial at the time of surgery. Marrow cavity was also filled with the biomaterial. Right limb did not receive the biomaterial, then constituting the control group. Tibias were harvested from five animals at 8, 60 and 150 days after surgery; three of them were analyzed by histological and biomechanical assessment and the two remaining tibias by X-ray diffraction. Results showed that the biomaterial is biocompatible, with osteoconductivity and osseointegration properties. Histological analysis and diffractograms showed the presence of hydroxyapatite in samples in all periods, although the presence of organic material of low crystallinity was variable. There was no statistical difference in the forces required for removal of the biocompatibility, osteoconductivity and osseointegration, it was not able to promote a better intramedullary pin anchorage.

Resumo A infecção de sítio cirúrgico (ISC) tem sido apontada como a terceira causa mais comum de infecção nosocomial. Este estudo objetivou determinar o perfil epidemiológico da ISC e sua associação aos fatores de risco descritos. Trata-se de um estudo transversal, realizado no Hospital São João Batista de Viçosa-MG e na Clínica Cirúrgica de Cães e Gatos do Hospital Veterinário da Universidade Federal de Viçosa-MG, no período de setembro de 2012 a fevereiro de 2013. As taxas globais de ISC foram de 0,7% no hospital humano e 3,46% no veterinário. No hospital veterinário, a taxa de ISC não mostrou relação com o potencial de contaminação, apresentando a maior taxa nos procedimentos classificados como limpos. Quanto ao tipo de cirurgia, as ortopédicas são as mais comuns em ambos os hospitais e também as que apresentam maior taxa de ISC. Cirurgias com duração maior que 120 minutos corresponderam a 15,25% do total de procedimentos no hospital humano e são ainda menos comuns no veterinário, com 1,26%. A taxa de ISC não parece estar relacionada à duração da cirurgia nesta estratificação. As bactérias isoladas das feridas cirúrgicas foram multirresistentes e os dados levantados indicam que não houve critério quanto ao emprego da antibioticoprofilaxia, principalmente nas cirurgias limpas. Este cenário mostra que é de extrema relevância a atuação de uma comissão de controle de infecção hospitalar, a fim de garantir obtenção de dados fidedignos, para que se possa avaliar a qualidade do serviço prestado e assim promover a redução dos riscos de complicações pós- operatórias.

Abstract Surgical site infection (SSI) has been indicated as the third cause of nosocomial infection. The present study aimed to determine the epidemiological profile of SSI and its association with the risk factors. It is a transversal study done at the São João Batista Hospital of Viçosa-MG and at the Surgery Service of the Small Animals Veterinary Hospital of the Universidade Federal de Viçosa-MG, from September 2012 to February 2013. Global SSI rates were 0.7% at the human and 3.46% at the veterinary hospitals. At the veterinary hospital, SSI rates were not related to contamination potential, with clean procedures presenting the greater rates. As for the type of surgery, orthopedic ones are the most common in both hospital and also the ones presenting the greater SSI rates. Surgeries during more than 120 minutes were 15.25% of the total of procedures at the human hospital and are even less common in the veterinary, with 1.26%. Rate of SSI does not seem to be related to surgery duration in this classification. Bacteria isolated from surgical wounds were multi-resistant and the obtained data indicated that no criteria of antibiotic prophylaxis existed, mainly for clean surgeries. This scenario shows that the action of a commission to control nosocomial infection are extremely relevant in order to guarantee reliable data so that the quality of service may be evaluated and thus, promoting a decrease the risk of in post-operative complications.

Sugarcane (Saccharum spp.) is one of the most important crops cultivated in the tropics and subtropics and plays a significant economic and environmental role in Brazil. Twentyfour new clones were evaluated in different locations as potential models for recommendation as new varieties. The mixed model methodology, using the harmonic mean of the relative performance of genetic values (MHPRVG), facilitated the analysis of genotypic stability and adaptability, culminating in the recommendation of clones for each location. MHPRVG ranked clones RB92579, RB867515, SP81-3250, RB947520 and RB931530 as the best five, and, additionally, clones with greater genotypic potential were identified for each test in the six localities.

Os solos utilizados para a cultura de arroz irrigado por alagamento no Estado do Rio Grande do Sul são oriundos de diferentes materiais de origem e estão sujeitos às variações temporais das condições de oxidação e redução. Essas condições contribuem para as variações nos teores totais e na crista-linidade de óxidos de Fe e de Mn, as quais estão relacionadas aos processos de sorção e dessorção, afetando a disponibilidade de P para a cultura de arroz irrigado. Com o objetivo de verificar a sorção de P e a sua disponibilidade para o arroz em solos oriundos de diferentes materiais de origem, foram desenvolvidos dois estudos: o primeiro para determinar os teores totais de Fe e de Mn e a capacidade máxima de adsorção de P (CMAP) pelas isotermas de Langmuir; além disso, foram associados a CMAP e os teores totais de Fe e de Mn, na razão FeOx6/Fe dit, razão MnOx6/Mn dit argila e da matéria orgânica. O segundo estudo foi para quantificar a sorção de P durante quatro períodos de alagamento do solo. Os solos oriundos de sedimento de basalto (Luvissolo, Vertissolo e Chernossolo) apresentaram maior CMAP do que os oriundos de sedimento de granito e arenito (Planossolos e Gleissolos), devido aos maiores teores totais de Fe e também às razões de Fe extraído por oxalato de amônio a pH 6 (Fe ox6)/ferro extraído por ditionito (Fe dit) e Mn extraído por oxalato de amônio a pH 6 (Mn ox6)/Mn dit. A razão Fe ox6/Fe dit apresentou a maior associação com a CMAP em todos os solos utilizados. O Planossolo teve menor sorção de P do que os solos oriundos de sedimento de basalto em todos os períodos de alagamento.

The soils used for irrigated rice by flooding in the state of Rio Grande do Sul, Brazil, are derived from different source material and are subjected to temporal variations in oxidation and reduction conditions. These conditions contribute to variations in total concentrations and crystallinity of iron oxides and manganese, which are related to sorption and desorption processes, affecting P availability to irrigated rice. With the objective of verifying P sorption and availability to rice in soils from different parent materials, two studies were conducted. In the first, the total content of Fe and Mn and maximum P adsorption capacity (MPAC) by the Langmuir Isotherm were determined, and associated with the MPAC, the total contents of Fe and Mn, FeOx6/Fe dit ratio MnOx6/Mn dit ratio, clay and organic matter. In the second study, P sorption was quantified in four flooding periods. In the soils derived from basalt sediment (Luvisolo, Vertisolo and Chernosolo), MPAC was higher than in soils derived from granite and sandstone sediment (Planosolos and Gleisolos), due to higher total of Fe and Mn contents and FeOx6/Fe dit and FeOx3/Fe dit ratios. The association with MPAC was highest with FeOx6/Fe dit in all soils. P sorption was lower in the Planossolo than in soils derived from basalt sediment in all flooding periods.