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Search Results: 1 - 10 of 111803 matches for " Madal?o "
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Susceptibilidade de espécies de plantas com potencial de fitorremedia o do herbicida sulfentrazone Selection of plants tolerant to sulfentrazone and potential for phytoremediation
Jo?o Carlos Madalo,Fábio Ribeiro Pires,Alberto Cargnelutti Filho,Alex Favaro Nascimento
Revista Ceres , 2013,
Abstract: Dentre as novas tecnologias, a fitorremedia o é op o para a descontamina o de áreas que receberam intensas aplica es de herbicidas. Este trabalho foi desenvolvido com o objetivo de selecionar espécies com potencial para a fitorremedia o de solos contaminados com o herbicida sulfentrazone. As espécies testadas foram: Calopogonium mucunoides, híbrido de sorgo (Sorghum bicolor x Sorghum sudanense), Crotalaria breviflora, Crotalaria juncea, Canavalia ensiformis, Dolichos lablab, Stizolobium deeringianum e Stizolobium aterrimum, cultivadas em cinco doses do sulfentrazone (0, 200, 400, 800 e 1.600 g ha-1). O experimento foi instalado em casa de vegeta o, utilizando-se vasos com capacidade para 6 L, preenchidos com amostras de solo coletadas na profundidade de 0-20 cm. Foram avaliadas a fitotoxicidade do herbicida, a altura de plantas e a massa de matéria seca da parte aérea e de raízes. As espécies que manifestaram os menores sintomas de fitotoxicidade e os maiores índices de altura e matéria fresca e seca foram C. juncea, C. ensiformis e D. lablab, sendo selecionadas como tolerantes ao herbicida sulfentrazone e com potencial para fitorremedia o. Among the new technologies, phytoremediation is considered as an option for the decontamination of areas that thave undergone intense herbicide applications. This work aimed to select species with potential to the phytoremediation of soils contaminated with the herbicide sulfentrazone. The tested species were Calopogonium mucunoides, hybrid Sorghum (Sorghum bicolor x Sorghum sudanense), Crotalaria breviflora, Crotalaria juncea, Canavalia ensiformis, Dolichos lablab, Stizolobium deeringianum e Stizolobium aterrimum. The experiment was conducted in a greenhouse, using 6 dm3 vases filled with soil samples collected at a depth of 20 cm. The experimental design was the randomized blocks in a factorial scheme of 8 x 5, with four repetitions, which were composed by the eight plant species, and five doses of sulfentrazone (0, 200, 400, 800 and 1,600g ha-1). We evaluated the phytotoxicity of the herbicide, plant height and dry weight of shoots and roots. The species showing the least symptoms of phytotoxicity and the highest rates of height and fresh and dry biomass were C. juncea, C. ensiformis and D. lablab, which were selected as tolerant to the herbicide sulfentrazone and with potential for phytoremediation.
Selection of species tolerant to the herbicide sulfentrazone with potential for phytoremediation of contaminated soils Sele o de espécies tolerantes ao herbicida sulfentrazone com potencial para a fitorremedia o de solos contaminados
Jo?o Carlos Madalo,Fábio Ribeiro Pires,Alberto Cargnelutti Filho,Alex Favaro Nascimento
Semina : Ciências Agrárias , 2012,
Abstract: This paper aimed to select species with potential for phytoremediation of soils contaminated with the herbicide sulfentrazone. Eight species were evaluated: Arachis pintoi, Eleusine coracana, Crotalaria spectabilis, Crotalaria ochroleuca, Cajanus cajan, Leucaena leucocephala, Stizolobium cinereum, and Raphanus sativus. The experiment was set-up inside a greenhouse, using pots with a capacity of 6dm3 filled with soil samples collected at a depth of 0-20cm. The experimental design was arranged into randomised blocks in a factorial scheme (8 × 5) with four replications, which consisted of the combination between the species and five doses of sulfentrazone (0, 200, 400, 800, and 1,600g ha-1). The herbicide phytotoxicity, plant heights, and dry masses of shoots and roots were evaluated. The species Cajanus cajan and Leucaena leucocephala had a higher tolerance to sulfentrazone up to a dose of 400g ha-1, showing minor symptoms of phytotoxicity and smaller decreases in plant heights and in dry matter accumulation, both in the shoots and roots, when compared to the control treatment, indicating, thus, the potential to be used for further studies on phytoremediation of sulfentrazone in soil. Este trabalho teve como objetivo selecionar espécies com potencial para a fitorremedia o de solos contaminados com o herbicida sulfentrazone. Foram avaliadas oito espécies: Arachis pintoi, Eleusine coracana, Crotalaria spectabilis, Crotalaria ochroleuca, Cajanus cajan, Leucaena leucocephala, Stizolobium cinereum e Raphanus sativus. O experimento foi instalado em casa de vegeta o, com a utiliza o de vasos com capacidade para 6 dm3 preenchidos com por es de solo coletadas na profundidade de 0-20 cm. O delineamento experimental foi o de blocos casualizados em esquema fatorial 8 × 5, com quatro repeti es, composto pela combina o entre as espécies e cinco doses do sulfentrazone (0, 200, 400, 800 e 1.600 g ha-1). Foram avaliadas a fitotoxicidade do herbicida, a altura de plantas e a massa da matéria seca da parte aérea e de raízes. As espécies Cajanus cajan e Leucaena leucocephala apresentaram maior tolerancia ao sulfentrazone até a dose de 400 g ha-1, mostrando menores sintomas de fitotoxicidade e menores redu es na altura de plantas e no acúmulo de matéria seca, tanto na parte aérea como nas raízes, em rela o ao tratamento controle, indicando, com isso, potencial de utiliza o para posteriores estudos de fitorremedia o de sulfentrazone em solo.
Uso de leguminosas na fitorremedia??o de solo contaminado com sulfentrazone
Madalo, Jo?o Carlos;Pires, Fábio Ribeiro;Chagas, Kristhiano;Cargnelutti Filho, Alberto;Procópio, Sergio Oliveira;
Pesquisa Agropecuária Tropical , 2012, DOI: 10.1590/S1983-40632012000400001
Abstract: residual sulfentrazone may remain in the soil for around two years, being a source of groundwater contamination and preventing the growth of susceptible plants. so, phytoremediation may represent an option for decontaminating areas which were highly affected by applications of this herbicide. this study aimed at evaluating the potential of crotalaria juncea, canavalia ensiformis, cajanus cajan and cajanus cajan (dwarf) for remediation of soil contaminated with sulfentrazone, using millet (pennisetum glaucum) as a bioindicator plant. the experiment was installed in a greenhouse and treatments consisted of the four species already mentioned, plus a control, and four sulfentrazone doses (0 g a.i. ha-1, 200 g a.i. ha-1, 400 g a.i. ha-1 and 800 g a.i. ha-1). plants height, phytotoxicity to sulfentrazone and fresh and dry matter were evaluated. when p. glaucum was grown after c. juncea, the fresh and dry matter, as well as plant height, were higher, while the phytotoxicity symptoms were less evident. c. juncea showed the best results for phytoremediation of soils contaminated with sulfentrazone.
Nutritional analysis of eucalyptus seedlings subject to the application of sewage sludge
Giovanni de Oliveira Garcia,Ivo Zution Gon?alves,Jo?o Carlos Madalo,Aline Azevedo Nazário
Engenharia Ambiental : Pesquisa e Tecnologia , 2009,
Abstract: In order to evaluate the application of doses of sewage sludge on mineral nutrition of seedlings in an experiment was conducted from August to October 2007 in the Study and Dissemination of Technology in Forest, Water Resources and Sustainable Agriculture in 50 L containers filled with an Oxisol. The experiment was riding in a completely randomized design in a 5 × 5 (five treatments and five periods of incubation) with four replications. The treatments consisted of application of five doses of sewage sludge (0, 25, 50, 75 and 100 ton.ha-1) and the incubation periods of 0, 20, 40, 60 and 80 days. In each period of incubation was performed a nutritional analysis which was withdrawn a plan being forwarded to the laboratory for determination of a nutritional analysis. Considering the specific case of sludge characterized in the present work, the implementation of the amounts shown increased concentrations of N, P, K, Zn and Cu decrease the levels of Mg, Bo, and the remaining Fe foliar Mn constant. Furthermore the incubation period established has not provided any changes in foliar nutrient studied.Key Words – Biosolids, Mineral nutrition, Eucalyptus grands.
Crescimento do Cafeeiro Conilon Irrigado com água Salina
Aline Azevedo Nazário,Giovanni de Oliveira Garcia,Ivo Zution Gon?alves,Jo?o Carlos Madalo
Engenharia Ambiental : Pesquisa e Tecnologia , 2010,
Abstract: In order to evaluate the initial growth of the Robusta variety Conilon Capixaba under irrigation with saline water was an experiment in a greenhouse in a completely randomized in a factorial 5x5 with five treatments (one irrigated with fresh water and saline water with four concentrations of 1.0, 2.0, 3.0 and 4.0 dS m-1), five evaluation periods (0, 60, 120, 180 and 240 days after planting) with four replications. The effects of irrigation with saline water on the initial growth of the coffee was made through an analysis of growth. With these results the irrigation with saline water compared with fresh water, within a period of evaluation, reduced the dry matter of shoots, roots and all, beyond the relative growth rate and the ratio shoot / root followed increasing the ratio of leaf area and leaf area. On the other hand the increase in soil salinity resulting from irrigation with saline water reduced the dry matter of shoots, roots and all, the total leaf area from 180 days after planting, followed by reduction in leaf area ratio and the ratio shoot / root after 60 days after planting.
Tolerance to salinity of chicory plants grown in hydroponics
Andriolo, Jer?nimo Luiz;Madalóz, José Carlos Cazarotto;Godoi, Rodrigo dos Santos;Janisch, Djeimi Isabel;Barros, Cláudia Alessandra Peixoto de;
Ciência Rural , 2008, DOI: 10.1590/S0103-84782008000400038
Abstract: chicory plants, cv. 'amarelo' and 'p?o de a?úcar', were grown hydroponically under four nacl concentrations in the nutrient solution to determine its tolerance to salinity. sowing was made in rows placed 0.05m apart, on a 0.15m deep sand growing bed placed over fibber cement tiles. after emergence, plants were thinned to a plant density of 1,600plants m-2. a standard nutrient solution was used, with the main composition of, in mmol l-1, 13.5 no3-; 2.5 nh4+; 1.5 h2po4-; 1.5 so4--; 7.5 ca++; 10.0 k+ and 1.5 mg++. the control (t1) was the standard nutrient solution, without addition of nacl. four salinity levels were compared, by adding 0.697 (t2), 1.627 (t3), 2.556 (t4) and 3.485 (t5)g l-1 of nacl. the nutrient solution was delivered to plants four times a day, in a closed system. a completely split plot randomised experimental design was used, with four replications. plants were harvested at 31 days after sowing, by cutting the shoot at 0.02m height. fresh and dry mass of both cultivars decreased linearly by effect of salinity. for similar values of electrical conductivity, the decrease in fresh mass was stronger in plants of the amarelo cultivar. adding nacl to the nutrient solution is a technique that may be used to reduce the water content of chicory plants grown hydroponically.
Crescimento e produtividade do almeir?o em concentra??es de N total contendo NH4+ na solu??o nutritiva
Godoi, Rodrigo dos Santos;Andriolo, Jer?nimo Luiz;Madalóz, José Carlos Cazarotto;Janisch, Djeimi Isabel;Barros, Cláudia Alessandra Peixoto de;
Ciência Rural , 2007, DOI: 10.1590/S0103-84782007000400043
Abstract: chicory plants, cv. amarela and p?o de a?úcar, were hidroponically grown to determine growth and yield under five ammonium and nitrate n concentrations in the nutrient solution. sowing was made in rows placed 0.05m apart, over a 0.15m deep sand growing bed supported by fibber cement tiles. after emergency, plants were thinned to a plant density of 1,600plants m-2. a standard nutrient solution was used, with the composition of, in mmol l-1, 11.0 de no3-; 1.5 h2po4-; 6.5 so4-2; 7.5 ca+2; 10.0 k+ and 1.5 mg+2, and, in mg l-1, 0.42 mn; 0.26 zn; 0.05 cu; 0.50 b; 0.04 mo, and 4.82 chelated fe. treatments were total n concentrations of 11.0; 16.0; 21.0; 26.0 and 31.0mmol l-1 in the nutrient solution, containing nh4+ concentrations of zero; 2.5; 5.0; 7.5 and 10.0mmol l-1, respectively. the nutrient solution was delivered to plants four times a day. a completely randomised split plot experimental design was used, with four replications. plants were harvested at 35; 59; 76 and 97 days after sowing, by cutting the shoot at 0.02m height, and fresh and dry mass was determined. maximum yield was reached using the nutrient solution with 16mmol l-1 of total n, containing 2.5mmol l-1 of nh4+.
Stress Loops Effect in Ductile Failure of Mild Steel  [PDF]
O.O. Oluwole
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2009, DOI: 10.4236/jmmce.2009.84026
Abstract: A simulation study of effect of stress on mild steel microstructure has revealed stress loops at areas of stress application which are believed to be the root cause of the ductile failure morphology (cup and cone) in ductile alloys under plane strain conditions. The areas of concentration of these stress loops were observed to be that of subsequent instability (or necking) observed in mild steel and other materials of low friction (flow) stress. Shear stress loops with angular bearing of 450 to the tensile axis were observed to instigate both the failure site and shear morphology in these materials. In plane stress conditions, shear was seen to be that of a wave shape running obliquely to area of stress application resulting in oblique necking observed in thin mild steel sheets.
Boundary Value Problem for an Operator-Differential Riccati Equation in the Hilbert Space on the Interval  [PDF]
O. O. Pokutnyi
Advances in Pure Mathematics (APM) , 2015, DOI: 10.4236/apm.2015.514081
Abstract: The paper is devoted to obtaining the necessary and sufficient conditions of the solvability of weakly perturbed boundary-value problems for the nonlinear operator-differential Riccati equation in the Hilbert space on the interval and whole line with parameter ?. We find the solution of the given boundary value problem which for ε = 0 turns in one of the solutions of generating boundary value problem. Solution of the generating problem is constructed with the using generalized operator in analytical form. Iterative process for finding of solutions of weakly nonlinear equation with quadratic error is constructed.
Vertex-transitive maps on a torus
O. Such
ACTA MATHEMATICA UNIVERSITATIS COMENIANAE , 2011,
Abstract: We examine FVT (free, vertex transitive) actions of wallpaper groups on semiregular tilings. By taking quotients by lattices we then obtain various families of FVT maps on a torus, and describe the presentations of groups acting on the torus. Altogether there are 29 families, 5 arising from the orientation preserving wallpaper groups and 2 from each of the remaining wallpaper groups. We prove that all vertex-transitive maps on torus admit an FVT map structure.
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