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| Registros recuperados: 35 | |
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| Guerra E., Guillermo A.; Aguilar Valdes, Alfredo; Cabral Martell, Agustin; Alvarado Martinez, Luis Felipe; Alvarado Martinez, Tomas Everardo; Arras Vota, Ana Maria; Moreno Medina, Salomon. |
| For decades, food security has been a worldwide problem affecting the poorest in order to find a possible solution to this dilemma that not only continues, but constantly grows with the increase in population. Agriculture, as the main food supplier, has evolved and increased its productivity, and has expanded its agricultural frontiers, since previous decades, in its attempts to solve this problem. If predominant conventional agriculture (mainly dedicated to productivity) is complemented with substantial increase of transgenic, organic, agroecological, greenhouse and hydroponic crops, it will be more feasible to avoid the loss of forest, the damage and loss of soils and at the same time diminish food insecurity. Within this context, the agribusiness... |
| Tipo: Journal Article |
Palavras-chave: Food security; Transgenic; Organics; Agro ecological; Hydroponics; Greenhouse; Agribusiness manager.; Agribusiness. |
| Ano: 2011 |
URL: http://purl.umn.edu/99477 |
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| Soares,Hammady R.; Silva,Ênio F. de F. e; Silva,Gerônimo F. da; Pedrosa,Elvira M. R.; Rolim,Mario M.; Santos,Alexandre N.. |
| The qualitative aspects of water, such as the preparation or replenishment of the nutrient solution, are critical to the success of hydroponic crops. Therefore, the aim of this study was to evaluate the behavior of “Americana” lettuce (cv. Tainá) under increasing levels of saline stress (0.2 - control, 1.2, 2.2, 3.2, 4.2 and 5.2 dS m-1), replenishing the evapotranspiration with brackish water in Experiment I and supply water (0.2 dS m-1) in Experiment II, both used in the preparation of the nutrient solution. In both experiments, the treatments were arranged in a randomized block design, with six treatments and four replicates. Shoot fresh matter, shoot dry matter and leaf area in Experiment I suffered reductions of 15.22, 12.67 and 15.6% per unit increase... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lactuca sativa L.; Hydroponics; Salinity. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015000700636 |
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| Silva,Diana S. N. da; Venturin,Nelson; Rodas,Cleber L.; Macedo,Renato L. G.; Venturin,Regis P.; Melo,Lucas A. de. |
| ABSTRACT This study analyzed the initial growth of baru in nutrient solutions with individualized omission of mineral nutrients in greenhouse. The experimental design was completely randomized with 13 treatments and four replicates: Complete Hoagland & Arnon solution and with individualized omissions of N, P, K, Ca, Mg, S, B, Cu, Fe, Mn, Mo and Zn. At 60 days the following morphological characteristics were evaluated: height, root collar diameter, number of leaves and number of leaflets. In addition, the Dickson quality index and root/shoot ratio were calculated and root dry matter, shoot dry matter and the contents and accumulations of nutrients in the shoots of the seedlings were analyzed. Analysis of variance of the collected data was performed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Native forest species; Hydroponics; Lacking nutrient technique. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016001201101 |
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| Soares,Hammady R. e; Silva,Ênio F. de F. e; Silva,Gerônimo F. da; Cruz,Adiel F. da S.; Santos Júnior,José A.; Rolim,Mário M.. |
| ABSTRACT The use of brackish water in hydroponic crops represents an alternative for vegetable production. In this context, two experiments were conducted to evaluate the effect of using brackish water to prepare the nutrient solution and replace the evapotranspired depth, applied at different flow rates, on cauliflower biometrics in NFT (nutrient film technique) hydroponic system. In both experiments, the experimental design was completely randomized with four repetitions, in a 6 x 2 factorial scheme: six levels of water electrical conductivity (ECw) in interaction with two flow rates of nutrient solution application in the hydroponic channels (1.5 and 2.5 L min-1). In Experiment I, brackish waters with different EC (1.5, 2.5, 3.5, 4.5 and 5.5 dS m-1),... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brassica oleracea var. botrytis L.; Hydroponics; Horticulture; Brackish water. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662020000400258 |
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| Cruz,Adiel F. da S.; Silva,Gerônimo F. da; Silva,Ênio F. de F. e; Soares,Hammady R. e; Santos,Jenyffer da S. G.; Lira,Raquele M. de. |
| ABSTRACT The tolerance of crops to salinity is greater in hydroponic systems due to the low contribution of the matric potential to the total potential of the water. The objective of this study was to evaluate the use of brackish water, to prepare the nutrient solution and replace the evapotranspired volume, and rates of application of this solution on the water stress index, water potential, leaf succulence and water consumption of cauliflower cv. ‘Piracicaba Precoce’. The experimental design was completely randomized in a 6 x 2 factorial scheme, with six salinity levels used to prepare the nutrient solutions (0.2, 1.5, 2.5, 3.5, 4.5 and 5.5 dS m-1) and two application rates of these solutions (1.5 and 2.5 L min-1), with four replicates. Water stress... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water relations; Hydroponics; Salinity. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000900622 |
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| Miranda,Fabio Rodrigues de; Silva,Valsérgio Barros da; Santos,Francisco Sérgio Ribeiro dos; Rossetti,Adroaldo Guimarães; Silva,Christiana de Fatima Bruce da. |
| The objective of this work was to evaluate yield and average fruit weight of strawberry cultivars Albion, Camarosa, Festival and Oso Grande, in two closed hydroponic systems (gutters and grow bags), using coconut fibre as substrate. The experimental design was of randomised blocks, divided into strips, with five replications. The hydroponic systems did not differ significantly as to yield, with advantages, such as savings in water and fertilizer and reduced environmental impact, over open systems. The most productive cultivar was Festival, followed by Oso Grande, with average yields of 6.99 kg m-2 and 5.56 kg m-2 respectively. The cultivars with the greatest fruit weight were Oso Grande and Albion, having averages of 11.8 and 11.1 g respectively, with the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fragaria x ananassa; Hydroponics; Fertigation. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902014000400022 |
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| Andrade,Sara Adrián López de; Jorge,Renato Atílio; Silveira,Adriana Parada Dias da. |
| The effect of cadmium (Cd) on mycorrhizal association and on shoot and root Cd concentration was investigated in jackbean plants under hydroponic conditions. The treatments consisted of the inoculation of three different species of arbuscular mycorrhizal fungi (AMF), Glomus etunicatum, G. intraradices and G. macrocarpum, and a non-inoculated control, two Cd (0 and 5 µmol L-1) and two P (1 and 10 mg L-1) levels in the nutrient solution. Mycorrhizal colonization, length of AMF extraradical mycelium, guaiacol peroxidase activity in roots, plant growth and root and shoot Cd and P concentrations were determined. Mycorrhizal status did not promote jackbean growth but in most of the cases mycorrhization increased root and shoot Cd concentrations. Cd ions were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Peroxidase; Cd accumulation; Extraradical mycelium; Phytoremediation; Hydroponics. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000400013 |
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| Silva,Daiana Alves da; Esteves,José Antônio de Fátima; Messias,Ueliton; Teixeira,Aurélio; Gonçalves,João Guilherme Ribeiro; Chiorato,Alisson Fernando; Carbonell,Sérgio Augusto Morais. |
| Common bean (Phaseolus vulgaris L.) is frequently grown in weathered soils with low phosphorus (P) availability, and this is one of the main limitations on its production. This study aimed to assess 20 common bean genotypes in a hydroponic system to select the best P concentration for inducing nutritional deficiency and to classify the genotypes in terms of nutrient utilization efficiency. The concentrations of P applied were 8.00, 4.00, 2.00 and 0.05 mg L¹. At 21 days, in the plot subjected to an application of the most severe stress, the 0.05 mg L¹ dose of P, had smaller plant size and early leaf abscission was observed. The 4.00 mg L¹ dose of P was the most efficient in inducing stress for discrimination of cultivars in terms of efficiency of use of P.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phaseolus vulgaris L.; Phosphorus nutrition; Classification of genotypes for P; Hydroponics; P deficiency. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000300008 |
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| Strassburger, André Samuel; Universidade Federal de Pelotas; Peil, Roberta Marins Nogueira; Universidade Federal de Pelotas; Fonseca, Leandro Andrade da; Universidade Federal de Pelotas; Aumonde, Tiago Zanatta; Universidade Federal de Pelotas; Mauch, Carlos Rogério; Universidade Federal de Pelotas. |
| O objetivo deste trabalho foi quantificar os índices de crescimento, a produção e a distribuição de matéria seca da cultura da abobrinha italiana cultivada em substrato de casca de arroz in natura com solução nutritiva recirculante, em duas épocas de cultivo: primavera-verão de 2005 e verão-outono de 2006, caracterizadas, respectivamente, como períodos de alta e baixa disponibilidades de radiação solar. Cada tratamento correspondeu a uma época de amostragem, sendo a produção de matéria seca quantificada aos 0, 18, 32, 46 e 68 dias após o transplante (DAT) no cultivo de primavera-verão, e aos 0, 15, 29, 43 e 55 DAT no cultivo de verão-outono. A produção de matéria seca foi maior quando a disponibilidade de radiação solar foi mais elevada. Nessa situação... |
| Tipo: Pesquisa de Campo |
Palavras-chave: 5.00.00.00-4; 5.01.00.00-9 Cucurbita pepo L.; Produção de matéria seca; Hidroponia; Área foliar; Radiação solar; Análise de crescimento 5.01.03.00-8 Cucurbita pepo L.; Dry matter production; Hydroponics; Leaf area; Solar radiation; Growth analysis. |
| Ano: 2011 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/5952 |
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| Backes, Fernanda Alice Antonello Londero; UNC; Barbosa, José Geraldo; UFV; Martinez, Hermínia Emília Prieto; UFV; Backes, Rogério Luiz; EPAGRI; Finger, Fernando Luiz; UFV. |
| O diagnóstico nutricional é fundamental para determinar as exigências das plantas quanto aos nutrientes, de forma a se proceder a um manejo adequado, de acordo com a espécie. Assim, para determinar as concentrações e conteúdos nutricionais adequados à produção e qualidade de plantas de lisianto em cultivo hidropônico, instalou-se um experimento onde as plantas foram cultivadas em sistema NFT, em diferentes soluções nutritivas. O experimento foi conduzido, segundo delineamento experimental em blocos casualizados, em esquema fatorial 4x3, totalizando 12 tratamentos, com três repetições. Os tratamentos foram compostos de quatro cultivares (Echo Champagne, Mariachi Pure White, Balboa Yellow e Ávila Blue Rim) e três soluções nutritivas (Teste, Steiner... |
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Palavras-chave: 5.01.00.00-9 Agronomia Eustoma grandiflorum; Hidroponia; Estado nutricional. Eustoma grandiflorum; Hydroponics; Nutritional supply. |
| Ano: 2008 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/5304 |
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| Steidle Neto, Antonio José; Departamento de Engenharia Agrícola, Universidade Federal de Viçosa, Viçosa, Minas Gerais; Zolnier, Sérgio; Departamento de Engenharia Agrícola, Universidade Federal de Viçosa, Viçosa, Minas Gerais; Marouelli, Waldir Aparecido; Centro Nacional de Pesquisa de Hortaliças, Empresa Brasileira de Pesquisa Agropecuária, Brasília, Distrito Federal. |
| O objetivo deste trabalho foi avaliar a influência da transpiração do tomateiro na fração lixiviada e na condutividade elétrica (CE) da solução nutritiva percolada no substrato de areia, em cultivo realizado sob condições de casa-de-vegetação. Foram utilizadas duas técnicas de fertirrigação, sendo uma denominada de sistema de controle convencional e outra, de sistema de controle computadorizado. No sistema de controle convencional, a solução nutritiva foi aplicada em intervalos de tempo fixos entre eventos de fertirrigação. No outro sistema, a aplicação ocorreu de acordo com estimativas de transpiração que foram realizadas pelo algoritmo de controle do sistema computadorizado. Em dias nublados, a CE da solução nutritiva drenada diminuiu em ambos os... |
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Palavras-chave: 5.03.02.00-0 Lycopersicon esculentum; Hidroponia; Cultivo sem solo; Fertirrigação; Casa-de-vegetação Engenharia de Água e Solo Lycopersicon esculentum; Hydroponics; Soilless cultivation; Fertigation; Greenhouse. |
| Ano: 2010 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/3246 |
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| Janisch,Djeimi Isabel; Andriolo,Jerônimo Luiz; Toso,Vinícius; Santos,Kamila Gabriele Ferreira dos; Souza,Jéssica Maronez de. |
| The objective of this research was to determine growth and dry matter partitioning among organs of strawberry stock plants under five Nitrogen concentrations in the nutrient solution and its effects on emission and growth of runner tips. The experiment was carried out under greenhouse conditions, from September 2010 to March 2011, in a soilless system with Oso Grande and Camino Real cultivars. Nitrogen concentrations of 5.12, 7.6, 10.12 (control), 12.62 and 15.12 mmol L-1 in the nutrient solution were studied in a 5x2 factorial randomised experimental design. All runner tips bearing at least one expanded leaf (patent requested) were collected weekly and counted during the growth period. The number of leaves, dry matter (DM) of leaves, crown and root,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fragaria x ananassa; Hydroponics; Propagation; Fertigation. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052012000300012 |
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| Registros recuperados: 35 | |
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