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| Registros recuperados: 2.625 | |
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| Hellmann,Liliane; Schmitz,Ana P. de O.; Módenes,Aparecido N.; Hinterholz,Camila L.; Antoniolli,Camila de A.. |
| ABSTRACT In this work, the potential of peach pit biosorption in the removal of the drug metformin hydrochloride from water is evaluated. Experiments are carried out in a closed batch system to evaluate the effect of the solution pH (2–10), temperature (25, 35 and 45 °C), stirring (100, 150 and 200 rpm) and chemical treatments. During the study, biosorbent characterization, kinetic tests, equilibrium tests and thermodynamic parameter calculations are performed. The operating conditions that show the best results for both the raw biosorbent and the biosorbent submitted to acid, basic and acid followed by basic treatments with removal capacities of 3.17, 10.83, 18.10 and 49.14 mg g−1, respectively, are pH 7, 25 °C and 100 rpm, which result in an equilibrium... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biosorption; Metformin hydrochloride; Peach pit; Kinetic modeling; Equilibrium modeling. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162021000200181 |
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| Tsytsiura,Yaroslav. |
| ABSTRACT This article generalises the peculiarities and efficiency of the use of three software packages, Digimizer image analysis software (v. 4.2), ImageJ2 version 2.0.0-rc-64 and WipFrag 3.3.14.0. These packages were used in studying the fractional composition of oilseed radish seeds for scanning in the mode of single-layer inseparable placement. The generalisation of the main caveats and features of the effective use of each of the software packages is made on the basis of detailed analysis of the features of each of package in the use to the features of the scan and the obtained scanned image The above-mentioned aspects are illustrated in detail and reservations about the options for the effective use of each package are represented. The efficiency... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fractional composition; Image analysis; Oilseed radish; Scanning; Seeds. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162021000200161 |
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| Zheng,Ming; Bai,Yungang; Zhang,Jianghui; Liu,Hongbo; Ding,Ping. |
| ABSTRACT In grape, high temperatures and low humidity prolong midday depression of foliar photosynthesis and dramatically reduce fruit yield. In this study, we explored the effects of various mist micro-spray treatments on grape photosynthesis at a test site in Shanshan County (N, 42.91°; E, 90.30°), Turpan, Xinjiang, China. We tested four different mist micro-spray durations including 1 h (WP1), 2 h (WP2), 3 h (WP3), and 0 h (CK). WP1, WP2, and WP3 affected canopy air temperature and humidity for 5 h, 7 h, and 9 h, respectively. At 12:30, WP1, WP2, and WP3 had the strongest cooling effect and altered temperature by −5.12 °C, −5.09 °C, and −5.17 °C respectively. The relative chlorophyll content was higher in the upper than the lower canopy leaves. There... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Air temperature; Chlorophyll; Photosynthesis; Stomatal conductance; Transpiration rate. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162021000100039 |
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| Ferreira,Fernanda L. V.; Rodrigues,Lineu N.; Silva,Demetrius D. da; Teixeira,David B. de S.; Almeida,Laura T. de. |
| ABSTRACT Detecting trends in streamflow and rainfall series can have great significance for proper water resource management. Thus, the objective of this study was to analyze the trends of historical streamflow and rainfall series using nonparametric statistical tests. A historical series of pluviometric and fluviometric gauges, which belong to the hydrometeorological network of the Brazilian Water National Agency in the Santo Antônio River Basin, Brazil, from 1985 to 2014 were used. By applying statistical tests, it was found that the time series are independent and random, and from the total 24 rainfall gauges evaluated, 12 presented nonstationary behavior, exhibiting mostly decreasing trends. Based on the six fluviometric gauges used for the annual... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Stationarity; Run test; Mann Kendall test; Pettitt test. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162021000100047 |
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| Thomson, Carolina Rios; Borsatto, Ricardo Serra; Bergamasco, Sonia Maria Pessoa Pereira. |
| As of 2003, the Brazilian government implemented the National Policy for Technical Assistance and Rural Extension (Pnater) that established a new governance format to provide public agricultural extension services, in which public and private agents share responsibilities. Within this new format, the funding, coordination, and regulation of the rural extension system is State's responsibility, while the execution of services relies on both public institutions and private outsourced entities. The research presented here explored the labor conditions of extension workers hired by private agents executing the Pnater, based on the hypothesis that the governance model establishes precarious conditions in extension work. To this end, semi-structured interviews... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Governança; Pluralismo Institucional; Pnater; Governance; Institutional Pluralism; Pnater. |
| Ano: 2021 |
URL: http://periodicos.ufsm.br/extensaorural/article/view/64910 |
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| Moreira, Uelton Silva; Gomes, Almiralva Ferraz; Araújo, Uajará Pessoa. |
| The housing deficit is still part of the brazilian reality. However, the My House My Life and the National Rural Housing Program (PNHR) were created with the objective of reducing this deficit and stimulating the socioeconomic development of the low-income population. In Anagé, interior of Bahia, the project was built through the PNHR, which benefited twenty one families. Through a case study and exploratory-descriptive research, this article aims to analyze the challenges faced by the Association of Small Farmers of Southwest Bahia (APASBA), responsible for the management and execution of the project. The data for analysis were collected through forms to the beneficiaries of the Project and interviews directed to the managers of APASBA, entity organizing... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Déficit habitacional; Políticas públicas; Programa Nacional de Habitação Rural; Public policy; National Rural Housing Program; House deficit. |
| Ano: 2021 |
URL: http://periodicos.ufsm.br/extensaorural/article/view/43090 |
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| Verruma-Bernardi,Marta R; Pimenta,Daniella M; Levrero,Gabriel RR; Forti,Victor A; Medeiros,Simone DS de; Ceccato-Antonini,Sandra Regina; Covre,Elizabete A; Ferreira,Marcos D; Moret,Raissa; Bernardi,Alberto CC; Sala,Fernando C. |
| ABSTRACT Kale is a vegetable that has high nutrition content, and balanced fertilization is essential to ensure high yield and quality of agricultural products. Curly kale, less known than regular leaf kale, is a new possibility for consumption. However, little is known about the influence of the type of fertilization on nutritional characteristics. This study aims to evaluate the influence of using organic fertilizers on the productivity, microbiological, and physico-chemical characteristics of Darkibor hybrid curly kale. The treatments consisted of three sources of organic fertilizers, one of organomineral fertilizer, and the control (without fertilization). The highest productivity was observed for kale that was treated with fertilizer in the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brassica oleracea var. acephala; Minerals; Post-harvest; Color; Weight loss. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362021000100112 |
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| Silveira,Bruna de S; Torres,José Luiz R; Orioli Júnior,Valdeci; Favaro,João Henrique de S; Costa,Luciene L; Charlo,Hamilton César de O. |
| ABSTRACT Intensive conventional tillage cultivation of both green and sweet corn can contribute to soil degradation when compared to no-till systems. This study aimed to assess the agronomic characteristics and physicochemical quality of green and sweet corn grains grown under succession planting using different cover crops. Two experiments were conducted, one with green corn and the other sweet corn, using a randomized block design consisting of seven treatments: brachiaria (B); Pearl millet (PM); showy crotalaria (SC); SC+B; PM+B; PM+SC and PM+SC+B, with four repetitions. The fresh (FW) and dry weight (DW) of the cover crops and decomposition of their residue were assessed, in addition to the agronomic performance and bromatological quality of green and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays; Specialty corn; Plant residues; Productivity; Physicochemical characteristics. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362021000100094 |
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| Ribeiro,Edenilson B; Castellani,Maria Aparecida; Andrade,Daniel Júnior de; Prado,Renato de M; Souza,Larissa Adelita SC; Freire,Daniel S; Savi,Patrice Jacob. |
| ABSTRACT Silicon is an inducer of plant resistance to arthropod pests, being a promising strategy for integrated management. The aim of this study was to evaluate the effect of silicon on biological, reproductive and population aspects of parental and F1 generations of the two-spotted spider mite on strawberry plants. Potassium silicate, nanosilica and water were applied to the plants. Two-spotted spider mite females were confined to strawberry leaf disks for oviposition and, after hatching, larvae were observed until the emergence of adults. Once adults had been obtained, couples were formed in order to evaluate pre-oviposition, oviposition, longevity and fertility, with an estimated net reproduction rate, intrinsic rate of increase, finite rate of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tetranychus urticae; Nanosilica; Induced resistance; Potassium silicate. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362021000100005 |
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| Correia,Núbia Maria. |
| ABSTRACT American black nightshade (Solanum americanum) is one of the main weeds for tomato crops. However, no herbicide approved for this crop in Brazil is effective for the control of this species and selective to tomato plants. Therefore, the objective of the present study was to evaluate the selectivity of the herbicide oxadiazon to plants of three processing tomato hybrids and the control of American black nightshade plants. Four trials were installed: one under greenhouse and three under field conditions. The greenhouse trial was conducted in a completely randomized design with four replications, using a 2x5 factorial arrangement consisting of preemergence and postemergence applications of five oxadiazon rates (75, 125, 250, 375, and 500 g ha-1) to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Solanum lycopersicum; Solanum americanum; Chemical control; Phytotoxicity.. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362021000100032 |
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| Azevedo,Alcinei M; Silva,Derly José H da; Seus,Rogério; Freitas,Elis Marina de; Afonso,Daniel F; Gomes,Cristiane L; Aspiazú,Ignácio. |
| ABSTRACT Kale has a long vegetative cycle, requiring a lot of labor, due to the need for tutoring, thinning and multiple harvests, leading to difficulties in the maintenance and evaluation of experiments. Thus, the objective was to estimate the minimum number of evaluations for the assertive selection of half-sib progenies of kale by means of a repeatability study by Bayesian approach. Twenty four half-sib progenies were evaluated in a randomized block design with four replicates and five plants per plot. The number of shoots, number of marketable leaves, fresh mass of marketable leaves and fresh mass per leaf were measured throughout 15 harvests. All traits showed high estimates of the repeatability, indicating high regularity in the expression of the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brassica oleracea var. acephala; Repeatability; Genetic improvement; Production of leaves. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362021000100020 |
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| Silva,Paulo TP; Oliveira,Gustavo E; Peloia,Paulo R; Carvalho,Regis C; Gonçalves,Flávia Maria A. |
| ABSTRACT The objective of this study was to propose models based on the harvest of specific fruit clusters to estimate the plot yield of trials containing fresh market tomato hybrids. Three experiments were conducted at the Experimental Station of Syngenta Crop Protection in the municipality of Holambra, state of São Paulo, Brazil, in 2016 and 2017. The experimental design was randomized complete blocks with 12 genotypes (experiments 1 and 3) and 13 genotypes (experiment 2), with 4 replicates and 10 plants per plot. Multiple linear regression models were fitted (stepwise method) with experiment 1 data (cross-validation), the best models were selected (higher adjusted R²) and then tested with experiments 2 and 3 data by mean of absolute percentage error... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Solanum lycopersicum; Tomato breeding; Linear regression. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362021000100058 |
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| Viana,Jonathan dos S; Palaretti,Luiz Fabiano; Sousa,Vinicius M de; Barbosa,José de A; Bertino,Antonio Michael P; Faria,Rogério T de; Dalri,Alexandre B. |
| ABSTRACT Collard is a vegetable widely consumed in Brazil. However, the quality and production of this vegetable depend on the supply and quality of water. Water stress and saline stress can make it impossible to grow. The objective of this study was to evaluate the performance of morphophysiological characteristics of collard cv. Georgia under irrigation levels and saline indices after the first defoliation.The experiment was conducted in a greenhouse, under random blocks design, and the treatments consisted of combinations of five water electrical conductivities (CEi in dS m-1: C1 =0.80; C2 =1.30; C3 = 1.80; C4 = 2.30; C5 = 2.80) and four irrigation levels based on the vase capacity (PwC: L1 = 55%; L2 = 70%; L3 = 85%; L4 = 100%), with four replications.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brassica oleracea var. acephala; Leafy vegetable; Brackish water; Irrigation management. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362021000100079 |
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| Ribeiro,Stéfanny Aparecida; Coneglian,Regina Celi C; Silva,Beatriz C da; Deco,Thayane A de; Prudêncio,Edlene R; Dias,Anelise. |
| ABSTRACT Peach palm heart (Bactris gasipaes) is a highly perishable product and, therefore, studies on extending its shelf life are quite necessary. Considering the high demand of this vegetable, this study aimed to evaluate the influence of using different plastic packages in order to extend the shelf life of the peach palm heart in natura. Stipes were collected from plants grown on family farms located in the municipality of Seropédica-RJ. Stipes were peeled, sanitized and packed at the Post-harvest Laboratory in Universidade Federal Rural do Rio de Janeiro (UFRRJ). In this experiment, the following treatments were applied: a control without package (C), unperforated polyethylene bag (UPB), perforated polyethylene bag (PPB), microperforated polyethylene... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bactris gasipaes; Storage; Modified atmosphere; Postharvest; Quality. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362021000100026 |
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| Sampaio,Italo MG; Silva Júnior,Mário L; Bittencourt,Ricardo FPM; Santos,Gabriel AM dos; Nunes,Fiama KM; Costa,Vivian CN. |
| ABSTRACT In the last years, jambu has become popular and greatly appreciated, due to its remarkable taste. Thus, hydroponically cultivated jambu is promising, since it achieves better yield and production quality. The aim of this study was to evaluate the effect of ionic concentration in nutrient solution on growth, productivity and gas exchange of jambu. The experimental design was completely randomized, with five treatments and four replicates. The treatments consisted of variations of ionic concentration using the nutrient solution proposed by Hoagland & Arnon (25, 50, 75, 100 and 125%). The length of the main stem, stem diameter, number of inflorescence, leaf area, fresh and dry biomass (shoot, root and inflorescence), photosynthesis, stomatal... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Acmella oleracea; Ionic concentration; Fresh and dry mass. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362021000100065 |
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| Oliveira,Camila S de; Maciel,Gabriel M; Fraga Júnior,Eusímio F; Peixoto,Joicy Vitória M; Assunção,Vitor B; Marques,Douglas José. |
| ABSTRACT The selection of genotypes with agronomic potential associated with drought tolerance is considered of high complexity. An alternative could be the use of selection indexes that can evaluate multiple characteristics simultaneously. This study aimed to select tomato genotypes with agronomic potential and drought tolerance by selection indexes. The experiment was conducted in a randomized block design with three replications. Ten treatments were evaluated: seven genotypes F2RC3, donor genitor (Solanum pennellii), recurrent genitor (UFU-040), and cv. Santa Clara. The irrigation was suspended until the substrate reached a matric potential of ≤-25 kPa for water stress simulation during the tomato cycle at 45, 60, 80 and 100 days after sowing. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Solanum lycopersicum; Abiotic stress; Selection gains; Backcross; Water deficit. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362021000100102 |
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| Registros recuperados: 2.625 | |
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