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| Registros recuperados: 40 | |
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| Hernández Flores, Benjamín. |
| México ocupa el onceavo lugar a nivel mundial como productor de jitomate (Lycopersicon esculentum Mill.), con una producción de 2.15 millones de toneladas (1.7% del total mundial), sin embargo es el segundo comercializador del producto en el mundo con aproximadamente 895,126 toneladas métricas, solo después de España que exporta 1,023,028 toneladas métricas. En México, el jitomate es una de las hortalizas de mayor importancia por el valor de su producción y superficie cultivada. Según cifras del SIAP-SAGARPA la superficie total cosechada durante el año de 2004 fue de 71,502.3 hectáreas y una producción total de 2.3 millones de toneladas, con un valor de la producción de 14,375.6 millones de pesos. En México los principales productores son: Sinaloa, Baja... |
| Tipo: Tesis |
Palavras-chave: M. incognita; M. arenaria; M. javanica; M. hapla; Textura de suelos; Materia orgánica; PH; Conductividad eléctrica; Meloidogyne spp.; Distribución espacial; Maestría; Fitopatología; Soil texture; Organic matter; Electrical conductivity; Spatial distribution. |
| Ano: 2007 |
URL: http://hdl.handle.net/10521/1584 |
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| Lorin,Higor E. F.; Costa,Mônica S. S. de M.; Chiarelotto,Maico; Santos,Francielly T. dos; Costa,Luiz A. de M.. |
| ABSTRACT The recovery of waste from the broiler production chain (BPC) is consistent with the principles of a circular economy. Besides turning waste into organic compost, its use as substrate for the production of vegetable seedlings further increases its economic value. However, it is necessary to adapt its characteristics to enable its use as substrate. To this end, the addition of boiler remnant charcoal wastes (BCW), another type of waste generated in the BPC, to the organic compost resulting from the composting of BPC waste with different bulking agents (BAs) was studied. The addition of BCW to agro-industrial compost reduced the electrical conductivity (EC) of substrates. Multiple linear regression showed that, of the 13 variables (physical,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Electrical conductivity; Circular economy; Easiness of removal of clod from tray; Seedling quality index; Salinity. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000600753 |
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| Megda,Michele Xavier Vieira; Mariano,Eduardo; Leite,José Marcos; Megda,Marcio Mahmoud; Trivelin,Paulo Cesar Ocheuze. |
| Abstract: The objective of this work was to evaluate the effect of the application of ammonium chloride as a nitrogen source for sugarcane (Saccharum sp.) on the development of the crop’s shoot and roots during two consecutive cycles. The experiment was conducted on a Typic Hapludox in the first and second sugarcane ratoons. The treatments consisted of four N doses (50, 100, 150, and 200 kg ha-1) applied as ammonium chloride (NH4Cl), besides a control, without the application of N. The increase in the NH4Cl dose increased in up to three times soil electrical conductivity in the layer of 0.0-0.2 m, with a consequent increase in the concentration of chlorine in leaves. In the second cycle, the contents of chlorine increased in 1,900 mg kg-1 in the leaf with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum; Electrical conductivity; Nitrogen fertilization; Root system; Stalk productivity. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000102100 |
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| Szareski,Vinícius Jardel; Carvalho,Ivan Ricardo; Kehl,Kassiana; Levien,Alexandre Moscarelli; Nardino,Maicon; Dellagostin,Simone Morgan; Demari,Gustavo Henrique; Lautenchleger,Francine; Villela,Francisco Amaral; Pedó,Tiago; Souza,Velci Queiróz de; Aumonde,Tiago Zanatta. |
| Abstract: The objective of this work was to evaluate the adaptability and multi-trait stability of wheat (Triticum aestivum) genotypes according to the phenotypic index of seed vigor (PIV). Thirty wheat genotypes were grown in seven environments in the state of Rio Grande do Sul, Brazil, during one crop season. In each environment, a randomized complete block design with three replicates was used. The PIV was elaborated from the following traits: first germination count, germination percentage, accelerated aging, and electrical conductivity. The evaluated phenotypic index makes it possible to define macroenvironments for the production of wheat seeds with high physiological potential and to understand the implications of the genotype x environment... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Triticum aestivum; Accelerated aging; AMMI; Electrical conductivity; Mixed models; Seed quality. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000600727 |
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| Trezzi,M.M; Vidal,R.A; Kruse,N.D; Gustman,M.S; Xavier,E; Rosin,D; Dedordi,G.F. |
| The action of herbicides that affect the integrity of cell membranes and cause leakage, like PPO-inhibitors, can be detected by measuring the electric conductivity (EC) of a solution in which the plant tissue target is incubated in the presence of herbicide. The objectives of this work were to confirm PPO resistance in a new Euphorbia heterophylla (EPHHL) biotype, and to compare the electrolyte leakage from R and S to PPO-inhibitors biotypes, using two different methods of incubation in a solution containing herbicides. One experiment was carried in greenhouse and three in laboratory, with a completely randomized design. In the greenhouse experiment, four biotypes of EPHHL were sprayed with seven rates of fomesafen to confirm resistance in suspected... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cell disruption; Electrical conductivity; Herbicide absorption; Resistance mechanism; Wild poinsettia. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582011000300020 |
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| Fraga,Thiago Isquierdo; Carmona,Felipe de Campos; Anghinoni,Ibanor; Marcolin,Elio. |
| In the State of Rio Grande do Sul, Brazil, flooded rice fields using Patos Lagoon as the source of water for irrigation are subject to be damaged by salinity, since this source is bound to the sea on its southern end. The sensitivity of rice is variable during plant development, being higher in the seedling and reproductive periods. However, there is not enough information about the behavior of plants under salt stress during the course of its development, especially in the vegetative stage. This study evaluated the effect of different levels of salinity of irrigation water on the salinity of soil solution over time and on some plant attributes, during the vegetative stage of rice. The study was conducted in a greenhouse, where seeds of the variety IRGA... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Electrical conductivity; Tillering; Vegetative growth; Oryza sativa L. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000400005 |
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| Heck,R. J.; Tiessen,H.; Santos,M. C.; Salcedo,I. H.; Alves,R. J. T.. |
| This study compares the chemical composition of the solution and exchange complex of soil in a 3-year-old irrigated vineyard (Vitis vinifera L., Red Globe cultivar) with that of adjacent clearing in the native hyperxerophyllic 'caatinga' vegetation. The soils are classified as Plinthic Eutrophic Red-Yellow Argisol; according to Soil Taxonomy they are isohyperthermic Plinthustalfs. Detailed physiographic characterization revealed an impermeable gravel and cobble covering the crystalline rocks; the relief of this layer was more undulating than the level surface. Significant higher concentrations of extractable Na, K, Mg and Ca were observed within the vineyard. Lower soil acidity, higher Ca/Mg ratios, as well as lower sodium adsorption and Na/K ratios... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vineyard; Physiography; Moisture content; Exchangeable cations; Electrical conductivity; Soluble cations; Sodicity; Acidity. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832002000100020 |
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| Carmo,Davi Lopes do; Silva,Carlos Alberto; Lima,José Maria de; Pinheiro,Gabriela Lúcia. |
| ABSTRACT Soil solution samplers may have the same working principle, but they differ in relation to chemical and physical characteristics, cost and handling, and these aspects exert influence on the chemical composition of the soil solution obtained. This study was carried out to evaluate, over time, the chemical composition of solutions extracted by Suolo Acqua, with the hydrophilic membrane (HM) as a standard, using soils with contrasting characteristics, and to determine the relationship between electrical conductivity (EC) and concentration of ions and pH of soil solution samples. This study was carried out under laboratory conditions, using three soils samples with different clay and organic matter (OM) contents. Soil solution contents of F−, Cl−,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Electrical conductivity; Water soluble carbon; Soil liquid phase; Soil solution extraction methods. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100405 |
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| Maia,Celsemy Eleutério; Rodrigues,Kelly Kaliane Rego da Paz. |
| One way of classifying water quality is by means of indices, in which a series of parameters analyzed are joined a single value, facilitating the interpretation of extensive lists of variables or indicators, underlying the classification of water quality. The objective of this study was to develop a statistically based index to classify water according to the Irrigation Water Quality Index (IWQI), to evaluate the ionic composition of water for use in irrigation and classify it by its source. For this purpose, the database generated during the Technology Generation and Adaptation (GAT) program was used, in which, as of 1988, water samples were collected monthly from water sources in the states of Paraíba, Rio Grande do Norte and Ceará. To evaluate water... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Salinity; Electrical conductivity; Ionic composition. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000300013 |
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| Machado,Flavia Cristina; Montanari,Rafael; Shiratsuchi,Luciano Shozo; Lovera,Lenon Henrique; Lima,Elizeu de Souza. |
| Brazilian soils have natural high chemical variability; thus, apparent electrical conductivity (ECa) can assist interpretation of crop yield variations. We aimed to select soil chemical properties with the best linear and spatial correlations to explain ECa variation in the soil using a Profiler sensor (EMP-400). The study was carried out in Sidrolândia, MS, Brazil. We analyzed the following variables: electrical conductivity - EC (2, 7, and 15 kHz), organic matter, available K, base saturation, and cation exchange capacity (CEC). Soil ECa was measured with the aid of an all-terrain vehicle, which crossed the entire area in strips spaced at 0.45 m. Soil samples were collected at the 0-20 cm depth with a total of 36 samples within about 70 ha. Classical... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Precision agriculture; Electrical conductivity; Management zones. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000401112 |
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| Carmona,Felipe de Campos; Anghinoni,Ibanor; Holzschuh,Marquel Jonas; Andrighetti,Marcelo Hoerbe. |
| Salinity levels in soils of the Outer Coastal Plain of Rio Grande do Sul, Brazil, can be high, due to excess of Na in the irrigation water, evapotranspiration and soil development from marine sediments. The cultivation of irrigated rice could be an alternative, since ion uptake as well as leaching by the establishment of a water layer could mitigate the effects of soil salinity. This study aimed to evaluate the dynamics of basic cations in the solution of Albaqualf soils with different salinity levels growing irrigated rice. The plow layer contained exchangeable Na percentages (ESP) of 5.6, 9.0, 21.2 and 32.7 %. The plant stand, dry matter, Na, K and Ca + Mg uptake at full flowering and grain yield were evaluated. The levels of Na, K, Ca + Mg and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Exchangeable sodium percentage; Potassium; Calcium; Magnesium; Electrical conductivity. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000600009 |
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| Bezerra,Idelfonso L.; Nobre,Reginaldo G.; Gheyi,Hans R.; Souza,Leandro de P.; Pinheiro,Francisco W. A.; Lima,Geovani S. de. |
| ABSTRACT The aim of this study was to evaluate the growth of grafted guava cv. ‘Paluma’ subjected to different concentrations of salts in irrigation water and nitrogen (N) fertilization. The plants were transplanted to 150 L lysimeters and under field conditions at the Science and Agri-food Technology Center of the Federal University of Campina Grande, in the municipality of Pombal - PB. The experiment was conducted in randomized block design in a 5 x 4 factorial scheme, with three replicates, and the treatments corresponded to five levels of electrical conductivity of irrigation water - ECw (0.3; 1.1; 1.9; 2.7 and 3.5 dS m-1) and four N doses (70, 100, 130 and 160% of the N dose recommended for the crop). The doses equivalent to 100% corresponded to 541.1... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Psidium guajava L.; Electrical conductivity; Nitrogen. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000100032 |
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| Lima,Nadielan da S.; Morais,Marciana B. de; Silva,Ênio F. de F. e; Camara,Terezinha R.; Willadino,Lilia. |
| ABSTRACT This study aimed to evaluate the effect of salt stress on production and antioxidative defense metabolism of two bell pepper cultivars (Capsicum annuum L.) grown hydroponically. The experimental design was in randomized blocks, with treatments arranged in a 5 x 2 factorial scheme with five replicates. The treatments consisted of five salinity levels of the nutrient solution (2.0, 3.5, 4.5, 5.5 and 6.5 dS m-1) with two bell pepper cultivars, ‘Bruno’ and ‘Rúbia’. Biomass and yield were reduced with increasing salinity. The contents of chlorophyll a, b and total decreased with increasing salinity. There was an increase in proline content and activity of superoxide dismutase (SOD), catalase (CAT) and ascorbate peroxidase (APX), showing the activation... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Electrical conductivity; Photosynthetic pigment; Antioxidant enzymes. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017001000675 |
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| Registros recuperados: 40 | |
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