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| Registros recuperados: 11 | |
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| Campos Júnior,José E.; Santos Júnior,José A.; Silva,Ênio F. de F. e; Martins,Juliana B.; Rolim,Mário M.. |
| ABSTRACT The need to use strategies for using brackish water in agriculture, especially in semi-arid conditions, is evident. Based on this information, this study was developed with the aim of evaluating the consumption, efficiency and water content, as well as the dry mass of the arugula plants (cv. Broad Leaf) exposed to brackish nutrient solutions as a function of replacement strategies and circulation frequencies. The treatments consisted of six salinity levels of the nutrient solution (1.5, 3.0, 4.5, 6.0, 7.5 and 9.0 dS m-1) and two circulation frequencies (twice a day 8 a.m. and 4 p.m., and three times a day at 8 a.m., 12 p.m. and 5 p.m.). In Experiment I, the evapotranspiration line was replaced with the respective brackish water used in the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Eruca sativa; Cultivation without soil; Salinity. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000600885 |
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| Santos Júnior,José A.; Gheyi,Hans R.; Cavalcante,Antônio R.; Dias,Nildo da S.; Medeiros,Salomão de S.. |
| RESUMO Em face de características relacionadas à infraestrutura, situação edáfica, hídrica e social, peculiares do semiárido brasileiro, é precípua a utilização de sistemas de cultivo alternativos que considerem tais características, inclusive a qualidade da água disponível. Dentro desta lógica, o objetivo do presente trabalho foi avaliar os efeitos do estresse salino sobre as variáveis de produção e pós-colheita de flores de girassóis cultivadas em um sistema hidropônico alternativo de baixo custo. Utilizou-se de delineamento experimental inteiramente casualizado, analisado em esquema fatorial 4 x 3, com três repetições; os tratamentos consistiram na utilização de quatro níveis de salinidade da solução nutritiva (1,7 – testemunha; 4,3; 6,0 e 9,0 dS m-1)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Floricultura; Salinidade; Agricultura familiar. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000300420 |
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| Cavalcante,Antônio R.; Santos Júnior,José A.; Furtado,Guilherme de F.; Chaves,Lúcia H. G.. |
| ABSTRACT Gas exchanges and chlorophyll a fluorescence are ways to physiologically analyze the response of plants to salt stress. In this context, the present work was conducted between August and November 2016 in a greenhouse at the Federal University of Campina Grande (7°12’52” S, 35°54’24” W, mean altitude of 550 m), using bell pepper plants cv. All Big, exposed to levels of nutrient solution electrical conductivity (1.7, 3.7, 5.7, 7.7, 9.7 and 11.7 dS m-1) and cultivated in hydroponic system, spaced by 0.2 and 0.3 m, focusing on the analysis of gas exchanges and photochemical efficiency. The experimental design was completely randomized, in a 6 x 2 factorial scheme, with five replicates. Plant density influenced the sensitivity of the gas exchanges to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Capsicum annuum L.; Low-cost hydroponics; Photosynthesis. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000100003 |
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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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| Santos Júnior,José A.; Gheyi,Hans R.; Dias,Nildo da S.; Medeiros,Salomão de S.; Filho,Doroteu H. G.. |
| O aproveitamento do potencial hídrico e nutricional da água residuária é uma alternativa viável para incrementar a oferta de água, principalmente em regiões semiáridas. Dentro desta lógica, o objetivo deste estudo foi avaliar o comportamento do crescimento de plantas de girassol (Helianthus annuus L.) cv. Embrapa 122-V2000 para fins ornamentais, cultivadas em sistema semi-hidropônico utilizando-se diferentes substratos e água residuária em lugar da solução nutritiva. O delineamento estatístico utilizado foi o inteiramente casualizado, analisado em esquema fatorial 4 x 3, com três repetições, totalizando 36 unidades experimentais. Testaram-se quatro intervalos de tempo de renovação/substituição da água residuária (diariamente, a cada dois, três e quatro... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Qualidade de água; Semiárido brasileiro; Floricultura. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662014000800002 |
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| Martins,Juliana B.; Santos Júnior,José A.; Bartusch,Victor P.; Gheyi,Hans R.; Bezerra Neto,Egídio; Silva,Manassés M. da. |
| ABSTRACT The analysis of plant response to the cationic variability of the waters, in addition to the osmotic component, is indispensable in the context of salt stress. Thus, between October 2017 and February 2018, in Recife, PE, Brazil (8° 1’ 7” S and 34° 56’ 53” W, and altitude of 6.5 m), the present study was carried out to evaluate the water relations of parsley plants (Petroselinum crispum), cv. Graúda Portuguesa, cultivated in brackish nutrient solutions (electrical conductivities of 1.7, 2.7, 3.7, 4.7, 5.7 and 6.7 dS m-1) prepared in waters with different cationic natures (NaCl, CaCl2, KCl and MgCl2). The experimental design was completely randomized, in a 6 x 4 factorial scheme, with five repetitions, and five plants per plot. Two experiments were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Petroselinum crispum; Soilless cultivation; Water content. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000900662 |
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| Andrade Filho,Jerônimo; Dias,Nildo da S.; Batista,Rafael O.; Santos Júnior,José A.; Santos,Anne G. D.; Lima,Ana L. F.. |
| ABSTRACT The relevance of using technology for the rational destination of waste from a wide range of human activities is imminently paramount. In this context, between September 2014 and January 2015, in Mossoró, RN, Brazil (5º 11' 31" S; 37º 20' 40" W), the present work was conducted to evaluate strategies for the utilization of landfill leachate as source of water and nutrients in agriculture. For this, castor bean plants (Ricinus communis L.), cv. BRS Energia, cultivated in eutrophic Red Yellow Argisol, were subjected to irrigation depth application strategies, namely: initial application of leachate corresponding to 20, 40, 60 and 80% of the irrigation depth and subsequent application of the remaining water depth percentage using public-supply water,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Waste disposal; Irrigation; Oilseed crops. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000600378 |
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| Santos Júnior,José A.; Gheyi,Hans R.; Cavalcante,Antônio R.; Medeiros,Salomão de S.; Dias,Nildo da S.; Santos,Delfran B. dos. |
| ABSTRACT The increase of water use efficiency in crop production is a clear need in areas with restricted access to this resource and, in these cases, the adoption of forms of cultivation contextualized to local conditions are essential. Thus, the implications of the variation in the amount of seeds per cell (0.5, 1.0, 1.5 and 2.0 g) and spacing between cells (7.0, 10.0 and 15.0 cm) on variables related to consumption and water use efficiency for the production of coriander (cv. Tabocas) in a low-cost hydroponic system, an alternative for semiarid regions, were evaluated. A completely randomized experimental design, analysed in 4 x 3 factorial scheme with three replicates, was adopted, and the data were subjected to analysis of variance at 0.05 probability... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brazilian semiarid region; Coriandrum sativum L.; Prototype validation. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015001201152 |
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| Lira,Raquele M. de; Silva,Ênio F. de F. e; Simões Neto,Djalma E.; Santos Júnior,José A.; Lima,Breno L. de C.; Silva,Jucicléia S. da. |
| ABSTRACT The objective was to evaluate the growth and yield of sugarcane irrigated with brackish water and leaching fractions. A completely randomized experimental design was used, in a 5 x 2 factorial scheme, with four replicates. The treatments consisted of five irrigation water salinity levels (0.5, 2.0, 3.5, 5.0 and 6.5 dS m-1) and two leaching fractions (0 and 0.17), corresponding to 100 and 120% of the crop evapotranspiration. The irrigation management was performed daily. Irrigation water salinity levels were obtained by adding NaCl and CaCl2 to the public-supply water, in order to obtain a molar ratio between Na:Ca of 1:1. The following measurements were taken: height and stem diameter; number of tillers; number of leaves and leaf area with monthly... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum spp.; Salt management; Irrigation; Lysimeters. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000300170 |
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| Santos Júnior,José A.; Souza,Cassiana F. de; Pérez-Marin,Aldrin M.; Cavalcante,Antônio R.; Medeiros,Salomão de S.. |
| A necessidade precípua de estudos que abordem o aproveitamento de resíduos líquidos na irrigação de culturas em condições semiáridas, é evidente. Buscou-se, com o presente trabalho, analisar a viabilidade do aproveitamento da urina humana diluída em efluente doméstico (0; 1,5; 3,0 e 4,5%) na irrigação de plantas de milheto cultivadas em três solos (Luvissolo, Neossolo e Planossolo) oriundos de áreas degradadas do Núcleo de Desertificação dos Cariris, PB. Esses tratamentos foram distribuídos em um delineamento inteiramente casualizado, analisado em esquema fatorial 4 x 3 + 6, ou seja, quatro diluições de urina em efluente doméstico, três tipos de solo e seis testemunhas (utilizando-se água de abastecimento municipal na irrigação das plantas com e sem... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Reúso; Irrigação; Desertificação. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015000500456 |
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| Silva Júnior,Fernando J. da; Santos Júnior,José A.; Silva,Manassés M. da; Silva,Ênio F. de F. e; Souza,Edivan R. de. |
| ABSTRACT Hydroponic cultivation using saline waters is an alternative for agricultural production, especially in the cultivation of vegetables. Therefore, the present work was conducted with the objective of evaluating the water consumption, water use efficiency and water content, as well as dry matter partitioning of chives (Allium schoenoprasum), cv. Todo Ano Evergreen – Nebuka exposed to six levels of nutrient solution salinity (1.5, 3.0, 4.5, 6.0, 7.5 and 9.0 dS m-1), applied at two circulation frequencies (twice a day at 8 and 16 h; and three times a day - at 8, 12 and 16 h). The level in the nutrient solution reservoir, which decreased according to the water consumption by plants, was replaced with the respective saline water (Experiment I) and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Allium schoenoprasum; Cultivation of vegetables; Soilless cultivation. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000500359 |
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| Registros recuperados: 11 | |
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