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| Registros recuperados: 40 | |
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| Menezes,Heitor R. de; Almeida,Brivaldo G. de; Almeida,Ceres D. G. C. de; Bennett,John M.; Silva,Emanuelle M. da; Freire,Maria B. G. dos S.. |
| ABSTRACT This research studied threshold electrolyte concentration (TEC) of irrigation water and its effect on the infiltration rate of two contrasting soils from Pernambuco state, Brazil. The experiment was conducted in the Soil Chemistry and Salinity Laboratory of Federal Rural University of Pernambuco. Each soil was packed in five Buchner funnels, where one funnel from each soil was submitted to treatment with solution of electrical conductivity (EC) of 0.5, 1.0, 2.0, 4.0 or 8.0 dS m-1. For each funnel containing soil, an increasing ratio of NaCl to CaCl2 was applied in a treatment solution to achieve 10 increasing values of sodium adsorption ratio (SAR) from 0 to 100. These solutions were applied through a Mariotte bottle, with a constant hydraulic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Electrical conductivity; Saturated hydraulic conductivity; SAR. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662014001300053 |
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| Mantovani,José R.; Bernardes,Jéssica da S.; Landgraf,Paulo R. C.. |
| ABSTRACT In biodiesel production, vegetable press cake is obtained as waste, and a suitable destination for jatropha press cake would be the use in agriculture as organic fertilizer. This study aimed to evaluate the effect of jatropha press cake on soil fertility attributes and on lettuce production and accumulation of nutrients in the shoots. The experiment was conducted in pots in a greenhouse, in a randomized block design with eight treatments and five replicates. The treatments consisted of doses of jatropha press cake equivalent to 0, 0.5, 1.0, 2.0, 4.0, 8.0, 16.0 and 32.0 t ha-1. Portions of 5.5 dm3 of soil received limestone, phosphate fertilizer and the doses of jatropha press cake, and remained incubated for 30 days. After incubation, soil samples... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Organic waste; Organic fertilization; Nutrient; Electrical conductivity. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016001201089 |
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| Carneiro,Marcio A.; Lima,Augusto M. N.; Cavalcante,Ítalo H. L.; Cunha,Jailson C.; Rodrigues,Marcos S.; Lessa,Thiago B. da S.. |
| ABSTRACT Irrigated fruit crops have an important role in the economic and social aspects in the region of the Sub-middle São Francisco River Valley. Thus, the aim of this study was to evaluate soil salinity and the productive aspects of the mango crop, cv. Tommy Atkins, fertigated with doses of potassium chloride (KCl) and potassium sulfate (K2SO4) during two crop cycles (from January to March 2014 and from January to March 2015). The experiment was carried out in a strip-split-plot design and five potassium doses (50, 75, 100, 125 and 150% of the recommended dose) as plots and two potassium sources (KCl and K2SO4) as subplots, with four replicates. Soil electrical conductivity (EC), exchangeable sodium (Na+) and potassium (K+) contents and pH were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Electrical conductivity; Plant nutrition; Mangifera indica L.; Semi-arid region. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000500310 |
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| Ferraz,Rener L. de S.; Magalhães,Ivomberg D.; Beltrão,Napoleão E. de M.; Melo,Alberto S. de; Brito Neto,Jósé F. de; Rocha,Maria do S.. |
| ABSTRACTThe castor bean crop plays an important social, environmental and economic role, especially due to possibility of its use as feedstock for the generation of clean energy. Thus, this study aimed to evaluate the contents of photosynthetic pigments, cell membrane extrusion and the relative water content in the leaves of the castor bean cultivar ‘BRS Energia’ under silicon and salinity levels. The experiment was carried out at Embrapa Cotton, in a completely randomized design, in a 4 x 4 factorial scheme, and the treatments consisted of four silicon levels (0, 100, 200 and 300 mg L-1) and four water salinity levels of (ECw 0, 2, 4 and 6 dS m-1), with three replicates. The gradual increase in salinity levels reduced the concentration of photosynthetic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ricinus communis L.; Chlorophyll; Electrolyte leakage; Electrical conductivity; Leaf fertilization. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015000900841 |
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| Santana Júnior,Edvaldo B.; Coelho,Eugênio F.; Gonçalves,Karoline S.; Cruz,Jailson L.. |
| ABSTRACT The purpose of the study was to evaluate the effect of salinity levels of irrigation water on physiology and growth of banana cultivars during the vegetative stage. The experiment was carried out following a completely randomized design in split plots, with four levels of salinity in irrigation water (0.5, 2.0, 3.0 and 4.0 dS m-1) and four banana cultivars (Pacovan, Prata Anã, BRS Platina and Princesa) with three repetitions. Stomatal conductance, transpiration, relative water content, leaf water potential and proline concentration were evaluated at 150 days after transplanting (DAT), besides plant height, stem diameter and leaf area. All variables showed sensitivity to the increase of salinity level of irrigation water. The results of soil water... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Musa spp.; Relative transpiration; Electrical conductivity; Drip irrigation. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662020000200082 |
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| Silva,Rodrigo J. da; Ferreira Junior,José M.; Silva,Flavia A.; Santos,Antonio C. M. dos; Lima,Saulo de O.; Silva,Rubens R. da. |
| ABSTRACT The development and survival of Eucalyptus urograndis plants may be influenced by products based on humic fractions of the organic matter, purified MAP and soil conditioners, such as hydrogel. Thus, the present study aimed to evaluate the effect of the commercial products Fertiactyl®, based on humic substances, purified MAP and hydrogel on the post-planting development and survival of Eucalyptus urograndis. The experiment was conducted in a randomized block design, with 25 treatments and four replicates, each of which consisted of 6 plants. The immersion of the tubes in solution with doses of Fertiactyl® and purified MAP promoted the increase in the development and survival of the plants. In the preparation of the hydrogel, the use of solution... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Electrical conductivity; Hydration; Immersion. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000700625 |
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| Matias,Janete R.; Torres,Salvador B.; Leal,Caio C. P.; Leite,Moadir de S.; Carvalho,Sara M. C.. |
| ABSTRACT Sunflower is a species with multiple potentialities and its yield can be affected by the presence of soluble salts in the soil, which is common in arid, semi-arid and irrigated regions. The objective of this study was to evaluate the effect of hydropriming as inducer of salinity tolerance in seeds and seedlings of sunflower, hybrid MG305CP. The germination tests were set with four replicates of 50 seeds per treatment, maintained in germinator at 30 ºC for ten days. To simulate salinity, sodium chloride diluted in distilled water was used at electrical conductivities of 0 (control), 4, 8, 12 and 16 dS m-1. On the tenth day, the number of normal seedlings was counted and the length and dry matter of shoots and roots were determined. Seedling fresh... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Helianthus annuus; Asteraceae; Physiological conditioning; Abiotic stress; Electrical conductivity. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000400255 |
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| Sousa,Alan B. O. de; Duarte,Sérgio N.; Sousa Neto,Osvaldo N. de; Souza,Ana C. M.; Sampaio,Pedro R. F.; Dias,Carlos T. dos S.. |
| ABSTRACT The purpose of this study was to evaluate the salt tolerance of mini watermelon (cv. Smile). The experiment was carried out in the greenhouse of the Department of Biosystems Engineering of ESALQ/USP. The experimental design was randomized blocks. The plants were irrigated with five levels of salinity (S1 = 1.0; S2 = 2.0; S3 = 3.0; S4 = 4.0 and S5 = 5.0 dS m-1). At 85 days after the beginning of the experiment, the plants and the physical and chemical variables of the fruit were evaluated. Salinity negatively affected the variables: length of the main stem, stem diameter, number of leaves, number of branches, leaf area, fresh and dry matter. Regarding the physical and chemical characteristics of fruits, salinity reduced the mass, diameter and the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Salt stress; Electrical conductivity; Cucurbitaceae. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016001000897 |
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| Ponciano,Isaac de M.; Miranda,Jarbas H. de; Cooke,Richard A.; Grah,Vanessa de F.; Silva,Alisson J. P. da. |
| ABSTRACT Despite the growing use of the time domain reflectometry (TDR) technique to monitoring ions in the soil solution, there are few studies that provide insight into measurement error. To overcome this lack of information, a methodology, based on the central limit theorem error, was used to quantify the uncertainty associated with using the technique to estimate potassium ion concentration in two soil types. Mathematical models based on electrical conductivity and soil moisture derived from TDR readings were used to estimate potassium concentration, and the results were compared to potassium concentration determined by flame spectrophotometry. It was possible to correct for random and systematic errors associated with TDR readings, significantly... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Central limit theorem; Instrumentation; Electrical conductivity. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000400343 |
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| Matthews,S.. |
| In comparisons of six seed lots of different F1 hybrid cultivars of cauliflower with similarly high laboratory germinations (above 90%) separation in germination was achieved after controlled deterioration (C.D.) at 24% moisture content (m.c.) and 45 0C for 24 hours. This measure of vigour was related to the position of the lots on the seed survival curve and was highly predictive of the longevity of the lots when stored at 15% m.c. and 20 0C for 12 and 16 weeks. When each seed lot was deteriorated at 24% m.c. for increasing times (from 0 to 36 hours) a reduction in the subsequent percentage germination was seen, which, using probit transformed percentages, was significantly and linearly related to the leakage of electrolytes into seed soak water over 24... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cauliflower; Controlled deterioration; Leakage; Electrical conductivity; Storage. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500011 |
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| Oliveira,Itamar Pereira de; Asher,Colin J.; Edwards,David G.; Santos,Renato S. Mota dos. |
| Magnesium applications (MgS0(4).7H(2)0) to achieve 8 and 16 mmol c/cm3 of Mg (324 and 1284 kg of MgS0(4) ha-1) were made on one Ultisol from Australia Northeast to correct Mg deficiency in plants and to verify the optimum level of Mg to grow common bean (Phaseolus vulgaris L). Magnesium was applied together with lime, N, K, Cu, Zn, B, and Mo as calcium carbonate, ammonium nitrate, potassium phosphate, cupric and zinc sulphate, boric acid and sodium molybdate respectively a month before planting and P as phosphoric acid at the planting. The pH reached the equilibrium after six weeks of incubation. Higher electrical conductivity (EC) was observed in soil where Mg was applied to reach 8 mmol c/cm3 in the absence of common bean and 16 mmol c/cm3 when the plant... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Magnesium; Plant height; Soil pH; Electrical conductivity. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100025 |
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| Vieira,R.D.; Minohara,L.; Carvalho,N.M. de; Bergamaschi,M.C.M.. |
| The relationship of black layer and milk line development on maize seed maturity was evaluated under tropical conditions. Seed moisture (g.kg-1), standard germination - SG (7 days, 25°C), and vigor, using accelerated aging-AA (96 hours, 42°C and 100% of RH), cold test-CT only in 1991/92 (7 days at 10°C and 7 days at 25°C) and electrical conductivity-EC (four 50-seed samples, 24 hours imbibition at 25°C) and milk line and black layer formation (using a five-stage rating system) were determined at 3 to 4 days intervals, using two genotypes (hybrid CX 133 and variety IAC 100) during the crop seasons of 1990/91 and 1991/92. The results showed that physiological maturity was reached before stage 4, based on seed germination and vigor (AA and CT) values, which... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Germination; Vigor; Accelerated aging; Cold test; Electrical conductivity. |
| Ano: 1995 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100023 |
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| Soares,Frederico Antônio Loureiro; Gheyi,Hans Raj; Viana,Sergio Batista Assis; Uyeda,Claudio Augusto; Fernandes,Pedro Dantas. |
| Considering the lack of information on salt tolerance of passion fruit (Passiflora edulis) seedlings, a study was carried out to evaluate the effects of water salinity on the vigor and initial growth in a completely randomized design with 8 levels of electrical conductivity of irrigation water (ECw), varying from 1.0 to 8.0 dS m-1. Salinity delayed the germination process, but relative reduction was observed only above ECw 4.43 dS m-1. Seedling vigor and growth decreased with increasing salinity, however, water at 4 dS m-1 resulted in 85% of vigor and seedlings with more than 50% growth in comparison to the lowest salinity treatment. Based on soil salinity, the passion fruit may be considered as 'moderately tolerant' to salinity during the initial phase. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Passiflora edulis; Salinity tolerance; Electrical conductivity. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300013 |
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| Carneiro,Paulo Torres; Fernandes,Pedro Dantas; Gheyi,Hans Raj; Soares,Frederico Antônio Loureiro; Viana,Sergio Batista Assis. |
| The cashew crop (Anacardium occiedentale L.) is of great economic and social importance for Northeast Brazil, a region usually affected by water and soil salinity. The present study was conducted in a greenhouse to evaluate the effects of four salinity levels established through electrical conductivity of irrigation water (ECw: 0.7, 1.4, 2.1 and 2.8 dS m-1, at 25ºC), on growth and physiological indexes of five rootstocks of dwarf-precocious cashew varieties CCP06, CCP09, CCP1001, EMBRAPA50, and EMBRAPA51. Plant height, leaf area, dry weight of root, shoot and total; water content of leaves, root/shoot ratio, leaf area ratio, absolute and relative growth rates and rate of net assimilation were evaluated. The majority of the evaluated variables were found to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anacardium occidentale; Electrical conductivity; Clones; Saline stress. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100002 |
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| Asoiro, Felix Uzochukwu; Simeon, Meshack Imologie; Azuka, Chinenye Eberechukwu. |
| The effects of floral location on the physicochemical and thermal parameters of honey samples from Enugu North senatorial zone were evaluated. Floral location had significant effects (P 0.05) on viscosity, electrical conductivity, sugar content, free acidity, ach content, moisture content, density, pH, colour, thermal heat conductivity and thermal heat diffusivity except, F/G ratio and specific heat capacity. Honeys from Igbo-Eze South were more viscose than the rest of the honey samples from other floral locations, with a mean viscosity value at 25 oC (15.58cSt) higher than that at 60 oC (12.63cSt). The electrical conductivity, ash content, moisture content and density ranged between 226.5 - 211.45 µS cm-1, 0.06 - 0.57%, 16.59 – 22.55% and 0.82 – 1.25 g... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Moisture content; Fructose; Free acidity; Density; Thermal heat diffusivity; Viscosity; Electrical conductivity. |
| Ano: 2022 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/7343 |
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| Peinado-Guevara,Héctor; Green-Ruíz,Carlos; Herrera-Barrientos,Jaime; Escolero-Fuentes,Oscar; Delgado-Rodríguez,Omar; Belmonte-Jiménez,Salvador; Ladrón de Guevara,María. |
| Soils in arid or semi-arid areas often have salinity problems, so the quality of irrigation water plays an important role in agricultural production. Groundwater quality analysis includes the determination of chloride ions, which are toxic to plants in high concentrations. A total of 1358 groundwater samples were collected and analyzed in the period 1980-2008. Water electrical conductivity [EC] and chloride ion concentration values were related by the linear equation [Cl-] = 4.928 EC (R> 0.94), to estimate the concentration of chloride ions as a function of the electrical conductivity of water in the study area. A geophysical survey was conducted through 34 Vertical Electrical Soundings (VESs) to calculate the water electrical conductivity from the... |
| Tipo: Journal article |
Palavras-chave: Archie's Law; Chlorides; Electrical conductivity; Resistivity; Vertical electrical sounding (VES). |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000100020 |
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| Meira,Messulan Rodrigues; Martins,Ernane Ronie; Resende,Luciane Vilela. |
| ABSTRACT: Lippia rotundifolia is a native species of the Cerrado, endemic to the chain backbone and highly aromatic, whose essential oil has medicinal properties of high pharmacological value, but because it is a non-domesticated species, little is known about its spread. Due to its importance, the objective was to evaluate the effect of the osmotic conditioning on the physical and physiological quality of seeds. The experimental design was completely randomized with four replications of 100 seeds, being treatments consisted of two kinds of seeds (with and without tegument) subjected to ten days of immersion in water (0, 2, 4, 6, 12, 24, 48, 72, 96 and 120 hours). After each period, the seeds were submitted to the electrical conductivity test and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tea-of-pedestrian; Germination; Vigor test; Electrical conductivity. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016001202096 |
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| Novella,Manuel Benito; Andriolo,Jerônimo Luiz; Bisognin,Dilson Antônio; Cogo,Clarissa Melo; Bandinelli,Maurício Guerra. |
| The effect of the nutrient solution concentration on potato plant growth and minituber yield were determined in a sand closed hydroponic system. Minitubers and micropropagated plantlets of the cv. 'Macaca' were used. Treatments were five nutrient solution concentrations at electrical conductivities (EC) of 1.0 (T1), 2.2 (T2), 3.4 (T3), 4.7 (T4) and 5.8dS m-1 (T5). The split plot randomised experimental design was used with three replications. Plants from minitubers produced higher fresh and mean weight of minitubers, shoot dry mass and leaf area index than the micropropagated ones. However, higher dry mass of minitubers was found with micropropagated plantlets compared to minitubers. The concentration of the nutrient solution did not affect minituber... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Solanum tuberosum; Plantlets; Plant propagation; Electrical conductivity. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782008000600006 |
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| Registros recuperados: 40 | |
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