RESUMO O conforto térmico adequado para o cultivo de plantas em ambientes protegidos está intrinsecamente ligado às propriedades das coberturas translúcidas. Este estudo investigou a influência de três tipos de filmes plásticos (difusor, transparente e leitoso) em três estufas agrícolas em Fortaleza, CE. O objetivo foi analisar as condições de temperatura e umidade relativa do ar, buscando recomendações para otimizar o desempenho das estufas. Dez estações de monitoramento foram distribuídas, três para cada cobertura plástica e uma externa; as leituras foram coletadas a 2 m de altura sendo equipadas com sensores de temperatura e umidade relativa do ar (SHT31). A coleta de dados ocorreu de 11 a 27 de julho de 2023, com leituras a cada 5 min (totalizando 12 leituras por hora), tratadas posteriormente por regressão linear. Diferenças significativas nas madrugadas (1 e 5%) entre as coberturas para temperatura e umidade relativa do ar foram observadas. Comparando os filmes, difusor × transparente e difusor × leitoso mostraram diferenças a 5 e 1%, respectivamente, enquanto transparente x leitoso não apresentaram diferenças. Durante o período das 12 horas, o filme difusor exibiu menores variações de temperatura. Conclui-se que a cobertura difusora proporcionou as menores temperaturas e menores variações ao longo do dia, sendo estatisticamente diferente dos filmes leitoso e transparente nos horários mais quentes. Esses resultados oferecem percepções cruciais para otimizar as condições em estufas agrícolas, contribuindo para práticas eficientes de cultivo protegido.

ABSTRACT Adequate thermal comfort for plant growth in protected environments is associated with properties of translucent coverings. This study investigated the influence of three types of plastic films (diffuser, transparent, and milky) at three agricultural greenhouses in Fortaleza city, CE, Brazil. The objective of this study was to analyze air temperature and relative air humidity conditions, seeking recommendations to optimize plant growth performance in greenhouses. Ten monitoring stations were distributed, three for each plastic covering and one external; readings were taken 2 m above the ground level, using temperature and relative air humidity sensors (SHT31). Data were collected from July 11 to July 27, 2023, with readings every 5 min (totaling 12 readings per hour) and subsequently processed through linear regression. The tested coverings resulted in different temperature and relative air humidity during early morning hours (1 and 5%). The comparison between diffuser and transparent, and diffuser and milky films showed differences at 5 and 1%, respectively, while transparent and milky films did not show differences. The diffuser film exhibited lower temperature variations throughout a 12-hour period. The diffuser covering provided the lowest temperatures and smaller variations throughout the day, which was significantly different from milky and transparent films during warmer hours. These results provide valuable information for optimizing conditions in agricultural greenhouses, contributing to sustainable and efficient practices in protected cultivation.

ABSTRACT The rapid conversion of water-soluble carbohydrates in sorghum (Sorghum bicolor (L.) Moench) into lactic acid causes an abrupt decrease in silage pH, promoting alcoholic fermentation and aerobic deterioration. Despite the use of microbial and chemical additives, the results remain inconsistent. Mixing sorghum with cactus pear (Nopalea cochenillifera (L.) Salm-Dyck) can improve the stability and fermentative characteristics of silage. The aim of this study was to determine the ideal level of cactus pear that provides a good microbiological profile, as well as decreases losses during the ensiling process of mixed silages of cactus pear and sorghum. The treatments were composed of levels of cactus pear in the sorghum ensilage (0%, 25%, 50%, 75% and 100% cactus pear on a natural matter basis in the mixture), with four replicates each. It was found a quadratic effect (p < 0.05) on lactic acid bacteria counts, DM recovery and gas losses, with maximum estimated values of lactic acid bacteria and DM recovery in the levels of 51.8% and 33.5% of cactus pear, respectively, and minimum value of gas losses in the level of 37.9% of cactus pear in the silage. An increasing linear effect (p < 0.05) was observed on silage aerobic stability, contents of ether extract and non-fiber carbohydrates. When using cactus pear in the production of mixed silages with sorghum, it is recommended 50% cactus pear in the mixture, as it optimizes DM recovery and aerobic stability of the silages.

ABSTRACT Early garlic (Allium sativum L.) cultivars are an alternative for growing this vegetable in low-altitude semi-arid regions, due to its lower requirement for mild temperatures and photoperiod. However, it is necessary to identify the cultivars that best adapt to these environmental conditions to improve management and maximize their production characteristics. In this sense, the objective was to evaluate early garlic cultivars’ biometric, yield, and quality characteristics under low altitude conditions in the semi-arid region. Two field trials were carried out in a Brazilian semi-arid region to evaluate 14 early-cycle and virus-free garlic cultivars. The climatic variations between the experiments influenced the performance of some cultivars in terms of biometric, yield, and quality characteristics. ‘Inhumas Casca Roxa’ (65.25 and 57.62 cm; 6.49 and 6.48 t in 2022 and 2023, respectively) and ‘Ugarte’ (61.70 and 55.14 cm; 6.34 and 5.62 t in 2022 and 2023, respectively) showed higher height and total yield. Likewise, ‘Inhumas Casca Roxa’ and ‘Ugarte’ stood out for bulb mass (20.00 and 19.61 g respectively), and percentage of bulbs in classes 5 (30.6% and 32.8%, respectively) and 6 (8.3% and 9.2%). These materials also showed good post-harvest quality characteristics, such as high pungency for fresh consumption and/or processing by industry. It is recommended to cultivate ‘Inhumas Casca Roxa’ and ‘Ugarte’ for garlic production in low-altitude semi-arid conditions.

Resumo Introdução: A galactorreia é um sintoma raro na infância. O diagnóstico diferencial é vasto e é necessária uma investigação cuidada, através de uma história clínica detalhada e um exame objetivo adequado. Descrição do caso: Criança de quatro anos do sexo masculino, com antecedentes de perturbação do comportamento e impulsividade (PCI), medicado com risperidona 0,20 mg/dia há quatro meses. Foi observado em consulta de doença aguda na sua Unidade de Saúde Familiar (USF) por apresentar corrimento mamilar bilateral esbranquiçado com cerca de uma semana de evolução, sem outra sintomatologia associada. Ao exame objetivo observou-se galactorreia bilateral, sem outras alterações. Solicitou-se estudo analítico (EA) que revelou aumento da prolactina e função tiroideia normal. Optou-se pela suspensão da terapêutica, repetição posterior do EA e referenciação para consulta de endocrinologia pediátrica (EP). Após duas semanas da suspensão do fármaco ficou assintomático e manteve-se em vigilância na USF. Em consulta de EP repetiu estudo analítico, que evidenciou valores normais de prolactina. Por manutenção da PCI iniciou paliperidona 3 mg/dia, mas quatro meses depois apresentou novamente galactorreia bilateral. Optou-se pelo incentivo à psicoeducação e suspensão da paliperidona. Comentário: Os autores pretendem alertar que os fármacos antipsicóticos são uma das principais causas de galactorreia, incluindo em idade pediátrica. Apesar da existência de outros diagnósticos diferenciais com maior gravidade, a suspensão de fármacos predisponentes a alterações hormonais pode ser uma prova terapêutica válida, evitando numa primeira fase exames de imagem desnecessários.

Abstract Introduction: Galactorrhea is a rare symptom in childhood. The differential diagnosis is extensive, and further investigation is necessary, aided by a detailed anamnesis and physical examination. Case description: A 4-year-old boy with a history of impulsive behavior had been taking risperidone 0.20 mg/day for four months. He was observed at his primary health care facility (PHCF) due to a bilateral whitish nipple discharge within one week of evolution. No other symptoms were reported. On physical examination, bilateral galactorrhea was observed. The remaining physical examination was normal. A blood test revealed normal thyroid hormone levels but an increased serum prolactin. Risperidone was discontinued, additional blood tests were scheduled, and the patient was referred to a pediatric endocrinology (PE) consultation. He became asymptomatic after two weeks of discontinuing risperidone. He maintained reassessment appointments at his PHCF. At PE consultation, he repeated blood tests which revealed normalized prolactin levels. For the management of persistent impulsive behavior, paliperidone was initiated at a dosage of 3 mg/day. However, after four months, bilateral galactorrhea recurred. Paliperidone was also discontinued and psychoeducation measures were emphasized. Comment: The authors aim to emphasize that antipsychotic drugs are among the main causes of galactorrhea, even in children. Despite the serious differential diagnosis of galactorrhea, suspending imbalance-predisposing hormonal drugs can be a valid therapeutic test, avoiding unnecessary imaging exams in the initial phase of the investigation.

Resumo Objetivo Avaliar o estresse laboral, a satisfação e a motivação para o trabalho de profissionais de enfermagem de bloco operatório no Brasil. Métodos Estudo do tipo open survey nacional, realizado entre os meses de agosto e dezembro de 2023. Utilizou-se Escala de Satisfação no Trabalho - EST, o questionário de Motivação para o trabalho e a Escala de Estresse no Trabalho – EET em um formulário online. Resultados Houve um total de 385 respostas, sendo 160 profissionais (41,6%) técnicos ou auxiliares de enfermagem e 225(58,4%) enfermeiros. Houve elevada parcela de profissionais com níveis de estresse entre moderado e elevado (72,98%), tendo sido significativo o resultado de maior estresse moderado a elevado nos profissionais do turno diurno (p=0,01) e sem diferença por gênero nem faixa etária. Não houve diferença estatisticamente significativa entre as variáveis para técnicos e enfermeiros, nem em função do tipo de vínculo. Ter dois ou mais empregos e trabalhar em horários diurnos está associado a maior percepção de estresse relacionado ao trabalho. Conclusão A elevada proporção de profissionais técnicos de enfermagem e enfermeiros com estresse moderado e elevado merece destaque entre os achados da pesquisa.

Abstract Objective Evaluating job stress, job satisfaction and job motivation among operating room nurses in Brazil. Methods This was a national open-ended survey carried out between August and December 2023. The Work Satisfaction Scale (WSS), the Motivation for Work questionnaire and the Work Stress Scale (WSS) were used in an online form. Results There were a total of 385 responses, of which 160 professionals (41.6%) were nursing technicians or assistants and 225 (58.4%) were nurses. There was a high proportion of professionals with moderate to high levels of stress (72.98%), with a significant result of greater moderate to high stress in day shift professionals (p=0.01) and no difference by gender or age group. There was no statistically significant difference between the variables for technicians and nurses, nor according to the type of employment. Having two or more jobs and working daytime hours is associated with a higher perception of work-related stress. Conclusion The high proportion of nursing technicians and nurses with moderate and high stress deserves to be highlighted among the research findings.

Resumen Objetivo Evaluar el estrés laboral, la satisfacción y la motivación para trabajar de profesionales de enfermería del bloque operatorio en Brasil. Métodos Estudio tipo open survey nacional, realizado entre los meses de agosto y diciembre de 2023. Se utilizó la Escala de Satisfacción Laboral (ESL), el Cuestionario de Motivación para el Trabajo y la Escala de Estrés Laboral (EEL) en un formulario digital. Resultados Hubo un total de 385 respuestas, de las cuales 160 fueron de profesionales (41,6 %) técnicos o auxiliares de enfermería y 225 (58,4 %) enfermeros. Hubo una elevada porción de profesionales con niveles de estrés entre moderado y alto (72,98 %), donde fue significativo el resultado de más estrés de moderado a alto entre los profesionales del turno diurno (p=0,01) y sin diferencia por género ni grupo de edad. No se observó diferencia estadísticamente significativa entre las variables de técnicos y enfermeros, ni en función del tipo de vínculo. El hecho de tener dos o más empleos y trabajar en horarios diurnos se asoció a una mayor percepción de estrés relacionado con el trabajo. Conclusión La elevada proporción de profesionales técnicos de enfermería y enfermeros con estrés de moderado a alto se destaca entre los resultados del estudio.

ABSTRACT Producing grapes for juice has been gaining prominence in the Northeast region of Brazil with diversification of grape cultivars for juice production over the past decade. The aim of this study was to estimate the effect of different vine training systems and rootstocks on the vigor, yield, and morpho-agronomic traits of ‘BRS Cora’ grapes over six production cycles. The experiment was conducted in Petrolina, PE, Brazil, from 2017 to 2020. A randomized block experimental design was used with four replications in split-split plots in time, with evaluation of the espalier, pergola, and lyre training systems combined with the rootstocks IAC 572 and IAC 766. The variables studied were the following: bud fertility index; yield per plant; number of clusters per plant; weight, width and length of cluster and berry; soluble solids (SS); titratable acidity (TA); and ratio SS/TA. The response of the ‘BRS Cora’ vines were different depending on the training system, rootstock, production cycle, or interaction among them. The bud fertility index varied only as a result of the production cycle. The pergola training system increased yield in relation to espalier and lyre systems, also favoring a larger number and size of clusters. The IAC 766 rootstock increased berry size and TA, whereas IAC 572 favored higher sugar/SS content and SS/TA ratio. The fourth production cycle (harvest on 9 May 2019) led to the best agronomic performance of ‘BRS Cora’ grapevines under the conditions of the Submédio do Vale do São Francisco region.

Spondias tuberosa (umbu) has been studied from the perspective of natural product and pharmacology, revealing relevant biological activities. Therefore, from the point of view of chemical and biological studies, deepening knowledge about this species is of great importance. Additionally, the evaluation related to the metabolic variations of the same species during different phenological evolution stages is also an interesting aspect of the research. Thereby, ultra performance liquid chromatography coupled to mass spectrometry (UPLC-QToF-MSE) was used to trace the chemical profile from umbu leaves at different phenological stages, allowing the detection of 40 metabolites, which 16 were annotated, such as phenolics and anacardic acids. Furthermore, the use of chemoinformatics tools allowed obtaining information on phenological development in the three leaves phases: post-flowering (young leaves), full production and senescence. The antiglycation activity assay revealed a potential inhibition of the formation of advanced glycation end-products (AGEs) in the leaves at different phenological stages. The antioxidant activity was satisfactory and in agreement with previously reported results, evidencing the potential for using umbu leaves, currently completely discarded, as an alternative source of antioxidants, which may provide increased added value to the cultivation of umbu, stimulating family farming and the recovery of tree density in degraded areas.

Objetivo analisar a situação vacinal de pessoas com diabetes mellitus tipos 1 e 2 na Atenção Primária à Saúde. Método estudo transversal, analítico, realizado em 25 equipes de Saúde da Família com 274 pessoas com diabetes. Foram avaliadas as variáveis sociodemográficas e clínicas e esquema vacinal completo para cada vacina recomendada pelo Programa Nacional de Imunizações, por meio de análise bivariada e regressão logística. Resultados das pessoas com diabetes mellitus, 69,1% não tinham esquema vacinal completo contra hepatite B; 64,6%, contra difteria e tétano; 74,3%, contra febre amarela; 87,9%, contra pneumococo; 87,9%, contra varicela; 24,5%, contra influenza; e 0,7%, contra a covid-19. Entre os motivos referidos para o esquema incompleto, estão não conhecer a importância de vacinar e não ser informado por profissional de saúde. Houve associação estatística significativa entre o perfil sociodemográfico e clínico em relação ao esquema vacinal completo da vacina da influenza e a idade e renda; covid-19 e idade, tipo de diabetes e tempo convivendo com o diabetes. Conclusão pessoas com diabetes mellitus tipos 1 e 2 apresentaram baixa completude vacinal no contexto da Atenção Primária à Saúde, o que é preocupante devido à situação de maior vulnerabilidade a infecções imunopreveníveis e mortalidade nesse grupo.

Objective to analyze the vaccination status of individuals with type 1 and type 2 diabetes in Primary Healthcare. Method cross-sectional, analytical study conducted in 25 Family Health teams with 274 individuals with diabetes. Sociodemographic and clinical variables were evaluated, as well as the full vaccination schedule for each vaccine recommended by the National Immunization Program, through bivariate analysis and logistic regression. Results among individuals with diabetes mellitus, the following incomplete vaccination rates were found: 69.1% for hepatitis B; 64.6% for diphtheria and tetanus; 74.3% for yellow fever; 87.9% for pneumococcus; 87.9% for varicella; 24.5% for influenza; and 0.7% for COVID-19. The reported reasons for low vaccination rates included not knowing the importance of vaccination and not being informed by healthcare providers. A statistically significant association was found between sociodemographic and clinical profile regarding the full vaccination schedule between the influenza vaccine and age and income; COVID-19 and age, type of diabetes and duration of diabetes. Conclusion individuals with type 1 and type 2 diabetes treated in Primary Healthcare showed low vaccination rates, which is concerning due to increased vulnerability to vaccine-preventable infections and mortality within this group.

Objetivo analizar la situación vacunal de personas con diabetes mellitus tipos 1 y 2 en la atención primaria de salud. Método estudio transversal, analítico, realizado en 25 equipos de Salud de la Familia con 274 personas con diabetes. Se evaluaron las variables sociodemográficas, clínicas y el esquema vacunal completo para cada vacuna recomendada por el Programa Nacional de Inmunizaciones mediante un análisis bivariado y regresión logística. Resultados de las personas con diabetes mellitus, el 69,1% no contaba con el esquema vacunal completo contra la hepatitis B; el 64,6% contra la difteria y el tétanos; el 74,3% contra la fiebre amarilla; el 87,9% contra el neumococo; el 87,9% contra la varicela; el 24,5% contra influenza y el 0,7% contra la COVID-19. Entre los motivos aludidos para el esquema vacunal incompleto, figuran no conocer la importancia de vacunarse y no haber sido informado por el profesional de la salud. Hubo asociación estáticamente significante entre el perfil sociodemográfico y clínico con relación al esquema vacunal completo entre la vacuna contra la influenza y la edad y los ingresos; COVID-19 y edad, tipo de diabetes y tiempo viviendo con diabetes. Conclusión las personas con diabetes mellitus tipos 1 y 2 presentaron baja completitud de las vacunas en el contexto de la Atención Primaria de Salud, lo que es preocupante debido a la situación de mayor vulnerabilidad a infecciones inmunoprevenibles y mortalidad en este grupo.

ABSTRACT Introduction: In the era of the knowledge economy, information management is a challenge for institutions regarding long-term digital preservation, metadata management, and copyright standards for open access. The DSpace repository was created for the management and dissemination of content produced by an institution; however, its implementation requires the involvement of various collaborators and task organization, which can be structured through a business model for complex organizational systems. Objective: To structure a Business Model Canvas for the digital repository of the Federal University of Vale do São Francisco. Methodology: A literature review was conducted on business models and the Business Model Canvas applied to digital repositories, along with an analysis of official documents from public agencies. For the practical execution of the research, the Business Model Canvas method was used, following these steps: 1) identification and understanding of the nine blocks that make up the method; 2) delimitation of the order of filling; 3) gathering of preliminary information; 4) comparison with models applied to digital repositories; 5) adaptation and application to the context of the RIU; 6) structuring of the RIU/Univasf Business Model Canvas. Results: The model is presented as a practical tool to clarify the proposal and understanding of the business, facilitating conceptual communication between managers and stakeholders. Conclusion: It is suggested that the structured Business Model Canvas for the Univasf digital repository be reapplied in the implementation process and validated in subsequent research.

RESUMO Introdução: Na era da economia do conhecimento, o gerenciamento da informação é um desafio para as instituições no que se refere à preservação digital a longo prazo, à gestão de metadados e às normas de direito autoral para acesso aberto. O repositório DSpace foi criado para gestão e difusão de conteúdos produzidos por uma instituição, porém, sua implementação exige atuação de diversos colaboradores e organização de tarefas, e pode ser estruturada por meio de um modelo de negócios para sistemas organizacionais complexos. Objetivo: Estruturar um Modelo de Negócios Canvas para o repositório digital da Universidade Federal do Vale do São Francisco. Metodologia: Foi realizada uma revisão da literatura sobre modelo de negócios e Business Model Canvas aplicada a repositórios digitais e análise de documentos oficiais de órgãos públicos. Para execução prática da pesquisa, utilizou-se o método Business Model Canvas, seguindo-se as etapas: 1) identificação e compreensão dos nove blocos que compõem o método; 2) delimitação da ordem de preenchimento; 3) levantamento de informações prévias; 4) comparação com modelo aplicado a repositórios digitais; 5) adaptação e aplicação ao contexto do RIU; 6) estruturação do Business Model Canvas RIU/Univasf. Resultados: Apresenta-se o modelo como ferramenta prática para clarificar a proposta e o conhecimento do negócio, e facilitar a comunicação conceitual entre os gestores e stakeholders. Conclusão: Sugere-se que o Modelo de Negócios Canvas estruturado para o repositório digital da Univasf seja reaplicado no processo de implantação e validado em pesquisas posteriores.

Abstract A retrospective and cross-sectional study was carried out on blood donors from Piauí State located at Northeastern Brazil to evaluate the prevalence of Hepatitis E Virus (HEV) infection. Serum samples were tested for anti-HEV IgG and IgM using electrochemiluminescence and HEV RNA was tested using real time PCR. A total of 890 individuals were included with median age of 33.4 years and most of them were male and lived at Mid-Northern region of the State. Prevalences of anti-HEV IgG and IgM were 1.35 % and 0.11 %, respectively. None HEV-RNA was detected. This study demonstrated low prevalence of HEV infection in blood donors in this region.

RESUMO OBJETIVO Avaliar a tendência espaço-temporal da mortalidade fetal no Brasil no período de 1996 a 2021. MÉTODOS Estudo ecológico de séries temporais com dados secundários de mortes fetais com idade gestacional (IG) ≥ 20 semanas do Sistema de Informações sobre Mortalidade (SIM) no Brasil, entre 1996 e 2021, pré-pandemia de covid-19 (1996–2019) e anos de 2020 e 2021 da pandemia. Analisou a taxa de mortalidade fetal (TMF) para identificar o risco anual de morte fetal na população específica. Foram calculadas a variação percentual (VP), variação percentual anual (VPA) e variação percentual média anual (VPMA) por meio de regressão Joinpoint, para determinar os padrões de tendência: crescente, decrescente ou estacionária. Utilizou-se os softwares Excel 2019, Stata e Joinpoint Regression. RESULTADOS No Brasil, mortes fetais na IG ≥ 20 semanas representaram 1,14% dos nascimentos e 58% das mortes perinatais no período analisado. Cerca de 93% foram anteparto, 6% intraparto e 1% foram registradas como ocorrido após o parto. A TMF global do período, considerando a IG ≥ 20, ≥ 22 e ≥ 28 semanas, foi de 11,4, 10,7 e 8,6/1.000 nascimentos, respectivamente. Apesar da tendência crescente dos natimortos nas mortes perinatais, desaceleração na redução e aumento durante a pandemia de covid-19, a TMF, nas idades gestacionais avaliadas, diminuiu 20%, 25% e 41%, respectivamente, com VPMA de -1,00, -1,13 e -1,89. CONCLUSÃO A mortalidade fetal apresentou tendência decrescente de longo prazo em âmbito nacional e regional no Brasil, com exceção da região Centro-Oeste, onde a tendência foi estacionária. A pandemia de covid-19 desacelerou a redução e aumentou a medida, no entanto, a tendência decrescente não foi interrompida. No âmbito regional, as TMF mais elevadas e as menores reduções ocorreram no Norte, Nordeste e Centro-Oeste, evidenciando desigualdades regionais.

ABSTRACT OBJECTIVE To evaluate the space-time trend of fetal mortality in Brazil from 1996 to 2021. METHODS Ecological time series study with secondary data on fetal deaths at gestational age (GA) ≥ 20 weeks from the Mortality Information System (SIM) in Brazil, between 1996 and 2021, covid-19 pre-pandemic (1996–2019), and years 2020 and 2021 of the pandemic. It analyzed the fetal mortality rate (FMR) to identify the annual risk of fetal death in the specific population. The percentage change (PC), annual percentage change (APC), and average annual percentage change (AAPC) were calculated using Joinpoint regression to determine the trend patterns: increasing, decreasing, or stationary. Excel 2019, Stata, and Joinpoint Regression software were used. RESULTS In Brazil, fetal deaths at GA ≥ 20 weeks accounted for 1.14% of births and 58% of perinatal deaths in the period analyzed. Around 93% were antepartum, 6% intrapartum, and 1% were recorded as occurring postpartum. The overall FMR for the period, considering GA ≥ 20, ≥ 22, and ≥ 28 weeks, was 11.4, 10.7, and 8.6/1,000 births, respectively. Despite the increasing trend of stillbirths in perinatal deaths, a slowdown in the reduction and an increase during the covid-19 pandemic, the FMR at the gestational ages evaluated decreased by 20%, 25%, and 41%, respectively, with a AAPC of -1.00, -1.13, and -1.89. CONCLUSION Fetal mortality showed a long-term downward trend at the national and regional levels in Brazil, except in the Central-West region, where the trend was stationary. The covid-19 pandemic slowed down the reduction and increased the measure, however, the downward trend was not interrupted. Regionally, the highest FMRs and the smallest reductions occurred in the North, Northeast, and Central-West, showing regional inequalities.

ABSTRACT Due to the important functions of calcium in plant physiology, supplementation of this nutrient may be a viable strategy to increase the tolerance of plants to salinity. Thus, the objective in this study was to evaluate the gas exchange and growth of broad-leaf arugula cultivars cultivated in coconut fiber subjected to salt stress. Four nutrient solutions [(S1 - standard nutrient solution (electrical conductivity of water - ECw of 0.5 dS m-1; S2 - nutrient solution using saline water with NaCl at 3.5 dS m-1; S3 - S2 enriched with Ca(NO3)2 at 50%; S4 - S2 enriched with Ca(NO3)2 at 100%, obtaining values of 2.3, 5.1, 5.5, and 5.9 dS m-1, for S1, S2, S3, and S4, respectively], and two cultivars of arugula (Donatella and Gigante Folha Larga), arranged in a 2 × 4 factorial scheme, with three replicates, were studied. Plants were harvested 40 days after sowing and evaluated for the following variables: plant height, number of leaves, leaf area, total fresh mass, total dry mass, specific leaf area, leaf succulence, relative chlorophyll index, stomatal conductance, CO2 assimilation rate, transpiration rate, internal CO2 concentration, instantaneous water use efficiency, and intrinsic carboxylation efficiency. The cultivar Gigante Folha Larga was more tolerant to salinity of nutrient solution. The use of salinized nutrient solution negatively affected arugula growth and physiology, but the extra addition of Ca(NO3)2 reduced the harmful effects of salinity. Extra addition of 50% of Ca(NO3)2 in the nutrient solution is recommended to reduce the effect of salt stress.

RESUMO Devido às importantes funções do cálcio na fisiologia vegetal, a suplementação deste nutriente pode ser uma estratégia viável para aumentar a tolerância das plantas à salinidade. Assim, o objetivo deste estudo foi avaliar as trocas gasosas e o crescimento de cultivares de rúcula de folhas largas cultivadas em fibra de coco submetidas ao estresse salino. Quatro soluções nutritivas [(S1-solução nutritiva padrão (condutividade elétrica da água - CEa de 0,5 dS m-1; S2- solução nutritiva utilizando água salina com NaCl a 3,5 dS m-1; S3-S2 enriquecida com Ca(NO3)2 a 50%; S4-S2 enriquecido com Ca(NO3)2 a 100%, obtendo valores de 2,3, 5,1, 5,5 e 5,9 dS m-1, para S1, S2, S3 e S4, respectivamente], e duas cultivares de rúcula. (Donatella e Gigante Folha Larga), dispostas em esquema fatorial 2 × 4, com três repetições, foram estudadas. As plantas foram colhidas 40 dias após a semeadura e avaliadas quanto às seguintes variáveis: altura de planta, número de folhas, área foliar, massa fresca total, massa seca total, área foliar específica, suculência foliar, índice relativo de clorofila, condutância estomática, taxa de assimilação de CO2, taxa de transpiração, concentração interna de CO2 e eficiência instantânea do uso da água e eficiência intrínseca de carboxilação. A cultivar Gigante Folha Larga foi mais tolerante à salinidade da solução nutritiva. O uso de solução nutritiva salinizada afetou negativamente o crescimento e a fisiologia da rúcula, mas a adição extra de Ca(NO3)2 reduziu os efeitos nocivos da salinidade. Recomenda-se adição extra de 50% de Ca(NO3)2 na solução nutritiva para reduzir o efeito do estresse salino.

ABSTRACT: The mango tree presents a high level of fruit abscission, which is increased in semiarid regions due to environmental stress. The use of biostimulants and phytoregulators has shown to be a promising strategy to improve fruit setting. Thus, the present study defined the best strategy for setting and development of the fruit, with the application of phytoregulators and biostimulants on the ‘Keitt’ mango tree, cultivated in the São Francisco Valley. Two experiments were performed. In experiment 1, a randomized block design was used, with four treatments T1: control, T2: gibberellic acid (AG3) + 2,4-dichlorophenoxyacetic acid (2,4-D), T3: AG3 + 2,4-D+Benzyladenine, T4: Biostimulant + CoMo® (sources of cobalt and molybdenum). In experiment 2, the factorial scheme (2 ×3 + 1) distributed in randomized blocks was established, corresponding to two forms of potassium fertilization (recommended and adjusted), three gibberellin concentrations (0, 10 and 20 mg L-1) and additional treatment (control - recommended potassium fertilization and no setting strategy). The variables analyzed include the relative number of fruits, the number of fruits for domestic and foreign markets, productive potential, production, productivity, fruit volume, fruit mass, and the yield of peel, pulp and stone. The application of 10 mg L-1 AG3 + 10 mg L-1 2,4-D + 10 mg L-1 Benzyladenine in full flowering of the ‘Keitt’ mango tree, increased the setting and the production of the fruit. Regardless of fertilization, sequential applications at 10 or 20 mg L-1 of AG3 proved to be an effective strategy to produce ‘Keitt’ mango tree. Adjusted potassium fertilization and the application at 10 mg L-1 of AG3 promotes the production of fruits with greater mass and volume.

RESUMO: A mangueira apresenta elevado índice de abscisão de frutos, que é potencializado em regiões semiáridas devido ao estresse ambiental. A utilização de bioestimulantes e fitorreguladores tem demonstrado ser uma estratégia promissora para melhorar a fixação de frutos. Assim, o presente estudo foi realizado com objetivo de definir a melhor estratégia para a fixação e desenvolvimento dos frutos, com a aplicação de fitorreguladores e bioestimulante na mangueira ‘Keitt’, cultivada no Vale do São Francisco. Foram realizados dois experimentos. No experimento 1, foi utilizado o delineamento de blocos casualizados, com quatro tratamentos T1: controle, T2: ácido giberélico AG3 + ácido 2,4-diclorofenoxiacético (2,4-D), T3: AG3+2,4-D+Benziladenina, T4: Bioestimulante + CoMo® (fontes de cobalto e molibdênio). No experimento 2, o esquema fatorial (2 ×3 + 1), correspondendo a duas formas de fertilização de potássio (recomendada e ajustada), três concentrações de giberelina (0, 10 e 20 mg L-1) e um tratamento adicional (controle - fertilização de potássio recomendada e sem estratégia de fixação). As variáveis analisadas incluem o número relativo de frutos, o número de frutos para os mercados doméstico e estrangeiro, o potencial produtivo, a produção, a produtividade, o volume de frutos, a massa dos frutos e o rendimento da casca, polpa e semente. A aplicação de 10 mg L-1 AG3 + 10 mg L-1 2,4-D + 10 mg L-1 de Benziladenina em floração plena da mangueira ‘Keitt’, aumentou a fixação e a produção de frutos. Independentemente da fertilização, as aplicações sequenciais de 10 ou 20 mg L-1 de AG3, mostraram ser uma estratégia eficaz para a produção da mangueira ‘Keitt’. A fertilização potássica ajustada e a aplicação de 10 mg L-1 de AG3 favorece a produção de frutos de maior a massa e o volume.

ABSTRACT The spatial variability of soil attributes in terraced areas is poorly studied in the semi-arid region. Considering that multivariate analysis enhances the diagnosis of spatial variability from geostatistics, soil attributes were studied in different zones between terrace channels in semi-arid region, more precisely in a retention terrace area in Canindé (Ceará, Brazil). Soil samples (n = 100) were collected at depths of 0.0 - 0.1 and 0.1 - 0.2 m for descriptive and geostatistical analysis. For multivariate analysis, samples from three zones relative to the terrace channel (Upper, Middle, and Lower) in the 0.0 - 0.2 m layer were considered, with 30 replicates. There was spatial dependence of soil attributes in the two layers studied. Near the channel, in the respective layers, there was higher clay content (13.7% and 14.7%) and higher degree of flocculation (61.3% and 71.7%) compared to the other zones. Water-dispersible clay was higher in the Upper zone (6.5% and 7.7% in the respective layers), while the Middle zone showed higher potential acidity in the evaluated layers (4.8 and 4.5 cmolc dm-3, respectively) compared to the other zones. In the multivariate analysis, there were highlights for the higher sum of bases in the Upper zone (18.9 ± 0.8 cmolc dm-3), higher sand content in the Middle zone (72.6 ± 0.6%), lower potential acidity (2.1 ± 0.2 cmolc dm-3) and higher phosphorus content (12.8 ± 3.0 mg kg-1) in the Low zone. The zone above the terrace channel loses mainly clay and requires practices to increase water and nutrient retention.

ABSTRACT Exposing seeds to agents that elicit tolerance to abiotic stress, such as phytohormones and organic acids, during hydration and dehydration cycles can determine their response to later stimuli, e.g. exposure to salt stress. The aim of this study was to evaluate the action of priming cycles with different eliciting agents of salt stress tolerance on seeds of the cowpea varieties Sempre Verde and Pingo de Ouro. The seeds were subjected to the following treatments: 0.0 mM NaCl (control); 100 mM NaCl (salt stress); salt stress + three seed-priming cycles (PC) in water; salt stress + PC in gibberellic acid; salt stress + PC in hydrogen peroxide; salt stress + PC in salicylic acid; salt stress + PC in ascorbic acid. The following variables were analysed: germination, growth, dry weight, salt tolerance index, total soluble sugars, total free amino acids and proline. Salt stress (100 mM NaCl) reduced germination, length and biomass accumulation in the Sempre Verde and Pingo de Ouro varieties. These showed the best response to the priming cycles with gibberellic and salicylic acids, which promoted greater germination potential, length and biomass under a salt stress of 100 mM NaCl, affording greater tolerance via osmotic regulation, especially in the Sempre Verde variety.