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  • 1
    Online-Ressource
    Online-Ressource
    Doses de adubação nitrogenada e potássica em cobertura na cultura da cana-de-açúcar, primeira soca, com e sem irrigação
    FapUNIFESP (SciELO) ; 2005
    In:  Ciência e Agrotecnologia Vol. 29, No. 4 ( 2005-08), p. 753-760
    Details
    In: Ciência e Agrotecnologia, FapUNIFESP (SciELO), Vol. 29, No. 4 ( 2005-08), p. 753-760
    Kurzfassung: This research had the objective of evaluating the effect of different manuring levels of N and K2O on the growth and yield of the sugar-cane (Saccharum spp, cultivate SP79 1011) first leaf, cultivated with and without irrigation. The experiment was conducted in the farm of the Miriri distillery, in the municipality of Capim, Paraíba state. The experimental scheme had a factorial type 2 x 4 (with and without irrigation and four levels of manuring of N and K2O) with three replications. The water irrigation depth used, 27.5 mm, was applied in intervals of 12 days. The manurings were composed of the elements N and K2O, in levels based on recommendations of the consultants of the Miriri distillery, equal to AC1 = 44 kg ha-1 of nitrogen and 41 kg ha-1 of potassium, AC2 = 86 kg ha-1 of nitrogen and 81 kg ha-1 of potassium, AC3 =157 kg ha-1 of nitrogen and 148 kg ha-1 of potassium, and AC4 =236 kg ha-1 of nitrogen and 222 kg ha-1 of potassium. When submitted to irrigation, the crop presented better yield in all appraised variables. In the irrigated parcels, the manuring affected significantly, through a positive linear behavior, the production of stems, sugar and alcohol, while in the non-irrigated parcels this effect was shown only for the production of stems. The maximum level of manurring in this work was not enough to get the maximum yield colm peak, using irrigation management or not.
    Materialart: Online-Ressource
    ISSN: 1413-7054
    URL: Article
    DOI: 10.1590/S1413-70542005000400006
    Sprache: Unbekannt
    Verlag: FapUNIFESP (SciELO)
    Publikationsdatum: 2005
    ZDB Id: 2021028-0
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    Online-Ressource
    Online-Ressource
    DESEMPENHO DO SISTEMA DE IRRIGAÇÃO POR ASPERSÃO, TIPO PIVÔ CENTRAL REBOCÁVEL.
    Brazilian Journal of Irrigation and Drainage - IRRIGA ; 2009
    In:  IRRIGA Vol. 14, No. 4 ( 2009-12-18), p. 481-491
    Details
    In: IRRIGA, Brazilian Journal of Irrigation and Drainage - IRRIGA, Vol. 14, No. 4 ( 2009-12-18), p. 481-491
    Kurzfassung: DESEMPENHO DO SISTEMA DE IRRIGAÇÃO POR ASPERSÃO, TIPO PIVÔ CENTRAL REBOCÁVEL.  José Dantas Neto; Jonas Carlos Santino Silva; Maria Sallydelâdia Sobral de Farias; Carlos Henrique de Azevedo de Farias; Carlos Alberto Vieira de Azevedo.Departamento de Engenharia Agrícola, Universidade Federal de Campina Grande, Campina Grande, PB, sally_farias@yahoo.com.br  1 RESUMO O objetivo deste trabalho foi avaliar a performance de um pivô central rebocável em nível de campo, na Fazenda Capim, localizada no município de Capim-PB. Os resultados da avaliação do equipamento nas três bases estudada levaram a concluir que: o equipamento apresentou bons resultados quando analisado como um todo para as base, constatou-se problemas de uniformidade e de eficiência em alguns setores quando a análise foi feita por raio individualmente, indicando setores com déficit e outros com excesso de água, o equipamento apresentou seus piores resultados quando foi avaliado na base 5, verificou-se que existe uma dispersão das lâminas de água aplicadas em relação ao valor médio, em todas as bases estudadas, as pressões de entrada do pivô nas bases, 4 e 5 estão muito abaixo da pressão recomendada o que resultou numa baixa vazão nestas bases. UNITERMOS: irrigação, manejo, variabilidade. DANTAS NETO, J.; SILVA, J. C. S.; FARIAS, M. S. S. de; FARIAS, C. HENRIQUE de A. de; AZEVEDO, C. A. V. de. PERFORMANCE OF TOWABLE CENTER PIVOT TYPE SPRINKLER IRRIGATION SYSTEM  2 ABSTRACT The objective of this work was to evaluate the performance of a towable pivot center in the field on Fazenda Capim in the municipal district of Capim-PB. The results of the equipment evaluation of the three studied bases showed that the equipment presented good results when analyzed as a whole for them. Uniformity and efficiency problems in some sections were analyzed when the analysis was individually made by ratio, indicating sections with deficit and other with excess of water. The equipment presented their worst results when it was evaluated in base 5. It was verified a dispersion of the applied water sheets in relation to the mean value, in all studied bases. The pressures on pivot in bases 4 and 5 are a lot below the recommended pressure and resulted in low flow in these bases.  KEYWORDS: irrigation, management, variability 
    Materialart: Online-Ressource
    ISSN: 1808-8546 , 1413-7895
    URL: Issue
    URL: Article
    DOI: 10.15809/irriga.2009v14n4
    DOI: 10.15809/irriga.2009v14n4p481-491
    Sprache: Unbekannt
    Verlag: Brazilian Journal of Irrigation and Drainage - IRRIGA
    Publikationsdatum: 2009
    ZDB Id: 2410931-9
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  • 3
    Online-Ressource
    Online-Ressource
    Mineral Composition of Lettuce Grown in Hydroponic System With Wastewater
    Canadian Center of Science and Education ; 2018
    In:  Journal of Agricultural Science Vol. 10, No. 7 ( 2018-06-08), p. 317-
    Details
    In: Journal of Agricultural Science, Canadian Center of Science and Education, Vol. 10, No. 7 ( 2018-06-08), p. 317-
    Kurzfassung: The use of treated effluents is not a new practice in agriculture, however, the optimization of wastewater was given with mineral fertilizers to grow lettuce in a hydroponic system, subject that is still barely studied. The objective of this study was to evaluate the mineral composition of three lettuce cultivars (Verônica, Vanda and Thais) in a hydroponic system using wastewater, well water and optimized nutrient solutions. The plants was grown in seven nutrient solutions, as S1 = Furlani solution; S2 = domestic wastewater; S3 = optimized domestic wastewater; S4 = well water; S5 = optimized well water; S6 = wastewater UASB and S7 = optimized UASB wastewater and the sub-plot for three lettuce cultivars. It was verified that the treatments S2, S4 and S6 when compared with the respective optimized solutions S3, S5 and S7 presented lower levels of nitrogen, potassium, calcium, zinc, copper and manganese in the two experiments. Same behavior was not observed for phosphorus and sodium. As for the cultivars, they presented, regardless of the experiment, mineral composition similar to each other when the same nutrient solution was used.
    Materialart: Online-Ressource
    ISSN: 1916-9760 , 1916-9752
    URL: Article
    DOI: 10.5539/jas.v10n7p317
    Sprache: Unbekannt
    Verlag: Canadian Center of Science and Education
    Publikationsdatum: 2018
    ZDB Id: 2501913-2
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  • 4
    Online-Ressource
    Online-Ressource
    Salinity levels in growth and production of curly lettuce (Elba, Cristina and Veneranda) grown in hydroponic system
    Southern Cross Publishing ; 2021
    In:  Australian Journal of Crop Science , No. 15(01):2021 ( 2021-1-2), p. 73-81
    Details
    In: Australian Journal of Crop Science, Southern Cross Publishing, , No. 15(01):2021 ( 2021-1-2), p. 73-81
    Kurzfassung: The objective of this research was to evaluate the different salinity levels on growth and production of three cultivars (Elba, Cristina and Veneranda) of curly lettuce in a hydroponic system using the Nutrient film technique (NFT). The design was randomized blocks in a split plot scheme, in which treatments constituted of nutrition solutions: S1 = Furlani (1.9 dS m-1) and six solutions prepared from Furlani solution in order to present the electrical conductivities of (S2 = 2.4; S3 = 2.9; S4 = 3.4; S5 = 3.9; S6 = 4.4 and S7 = 4.9 dS m-1) with three repetitions. The electrical conductivities were obtained by addition of NaCl. The subplots corresponded to the cultivars Elba, Cristina and Veneranda. The following variables were evaluated: Number of leaves per plant (NLP); Total production (TP); Commercial production (CP); Stem diameter (SD); Fresh leaf mass (FLM), Dry leaf mass (DLM) and Dry stem mass (DSM). Nutritional solutions (S1 and S2) promoted the best results for all variables studied. The highest number of sheets (NS) were found in cultivars Elba and Veneranda when the solutions were used (S1 and S2). The highest yields for (TP) (PC) and (FLM) were found in the cultivar Veneranda with nutrient solutions (S1 and S2). The highest value for dry leaf mass (DLM) and dry stem mass (DSM) was found in the cultivar Veneranda
    Materialart: Online-Ressource
    ISSN: 1835-2693 , 1835-2707
    URL: Issue
    URL: Journal
    URL: Article
    DOI: 10.21475/ajcs.21.15.01
    DOI: 10.21475/ajcs
    DOI: 10.21475/ajcs.21.15.01.2747
    Sprache: Unbekannt
    Verlag: Southern Cross Publishing
    Publikationsdatum: 2021
    ZDB Id: 2413553-7
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  • 5
    Online-Ressource
    Online-Ressource
    Soluções nutritivas salinizadas com cloreto de sódio no cultivo da alface crespa em sistema hidropônico
    Research, Society and Development ; 2021
    In:  Research, Society and Development Vol. 10, No. 14 ( 2021-11-13), p. e515101420437-
    Details
    In: Research, Society and Development, Research, Society and Development, Vol. 10, No. 14 ( 2021-11-13), p. e515101420437-
    Kurzfassung: A pesquisa teve como objetivo a avaliar a produção das três cultivares da alface crespa (Elba, Cristina e Veneranda) cultivadas em sistema hidropônico-NFT utilizando soluções nutritivas salinizadas com cloreto de sódio. O experimento foi conduzido em ambiente protegido, no Centro de Ciências Agrárias e Ambientais-CCAA da Universidade Estadual da Paraíba-UEPB Campus-II, localizado na zona rural do município de Lagoa Seca-PB, com coordenadas geográficas: (7 ° 10 ′ 15 ″ S, 35 ° 51 ′ 14 ″ W). O delineamento foi em blocos casualizados, em esquema de parcelas subdivididas, sendo as parcelas constituídas por soluções nutritivas com diferentes valores de condutividade elétrica (S2-2,4; S3-2,9; S4-3,4; S5-3,9; S6-4,4 e S7-4,9 dS m-1) e as subparcelas por diferentes cultivares de alface crespa (Elba, Cristina e Veneranda), com três repetições. As variáveis analisadas foram: Número de folhas por planta-NFP; Produção Total-PT; Produção Comercial-PC; Diâmetro do Caule-DC; Massa Fresca da Folha-MFF, Massa Seca da Folha-MSF e Massa Seca do Caule-MSC. Independentemente da variável analisada, não houve interação significativa entre as soluções nutritivas e as cultivares. Em relação ao efeito isolado da solução, o maior número de folhas por planta, produção total e comercial e massa fresca de folhas foi obtido com o uso da solução S1. Quanto às cultivares, Veneranda apresentou a maior produção comercial, massa fresca e seca da folha e seca do caule, esta cultivar também apresentou a maior média, mas sem diferir da Elba, quando avaliados o número de folhas e a produção total.
    Materialart: Online-Ressource
    ISSN: 2525-3409
    URL: Article
    DOI: 10.33448/rsd-v10i14.20437
    Sprache: Unbekannt
    Verlag: Research, Society and Development
    Publikationsdatum: 2021
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  • 6
    Online-Ressource
    Online-Ressource
    Qualidade de águas residuárias e salobra utilizadas no cultivo hidropônico de três cultivares de alface crespa
    Grupo Verde de Agroecologia e Abelhas ; 2016
    In:  Revista Verde de Agroecologia e Desenvolvimento Sustentável Vol. 11, No. 4 ( 2016-12-01), p. 19-
    Details
    In: Revista Verde de Agroecologia e Desenvolvimento Sustentável, Grupo Verde de Agroecologia e Abelhas, Vol. 11, No. 4 ( 2016-12-01), p. 19-
    Kurzfassung: 〈 p 〉 O reúso de efluentes tratados não é uma prática nova, no entanto, há um interesse crescente em relação à necessidade de sua reutilização. Objetivou-se avaliar a caraterização das águas residuárias domestica e do reator UASB e água salobra de poço para o cultivo hidropônico de alface crespa. O experimento foi conduzido em ambiente protegido com sistema hidropônico. Delineamento experimental foi em blocos casualizados com esquema fatorial 7 x 3, três repetições sendo, 7 soluções hidropônicase três cultivares de alface. A parcela experimental, S 〈 sub 〉 1 〈 /sub 〉 =solução de Furlani; S 〈 sub 〉 2 〈 /sub 〉 =água residuária domestica; S 〈 sub 〉 3 〈 /sub 〉 =água residuária domestica otimizada; S 〈 sub 〉 4 〈 /sub 〉 =água de poço; S 〈 sub 〉 5 〈 /sub 〉 =água de poço otimizada; S 〈 sub 〉 6 〈 /sub 〉 =água residuária (UASB) e S 〈 sub 〉 7 〈 /sub 〉 =água residuária (UASB) otimizada, subparcela três cultivares de alface. O pH das águas residuárias foram de 7,7 e 7,4 (Poço); 7,4 e 8,0 (Esgoto bruto) e, 7,2 e 8,2 (Extrabes). A (CE) foram 0,957 e 1,002 (Poço); 2,133 e 2,368 (Esgoto bruto) e (Extrabes) 2,502 e 2,4 09 dS m 〈 sup 〉 -1 〈 /sup 〉 . O uso de soluções minerais nutritivas utilizando água residuária é viável quando utilizado em sistemas hidropônicos, sendo indicado para principalmente para região do semiárido brasileiro e quando se faz uso de água de irrigação de qualidade inferior na produção de hortaliças. 〈 /p 〉 〈 p class="Default" align="center" 〉 〈 strong 〉 〈 em 〉 Quality of wastewater and brackish water used in the hydroponic cultivation of three varieties of curly lettuce 〈 /em 〉 〈 /strong 〉 〈 /p 〉 〈 p align="center" 〉 〈 strong 〉 〈 em 〉   〈 /em 〉 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 Abstract 〈 /strong 〉 〈 strong 〉 : 〈 /strong 〉 The reuse of treated wastewater is not a new practice, however, there is a growing interest in the need for re-use. The objective was to evaluate the Characterisation of domestic wastewater and UASB and brackish well for hydroponic lettuce. The experiment was conducted in a protected environment with hydroponically. Experimental design was a randomized block with factorial 7 x 3, three replications and 7 hydroponic solutions and three lettuce cultivars. The experimental portion, S1 = Furlani solution; S2 = domestic wastewater; S3 = domestica optimized wastewater; S4 = well water; S5 = optimized well water; S6 = wastewater (UASB) and S7 = wastewater (UASB) optimized subplot three lettuce cultivars. The pH of wastewater were 7.7 and 7.4 (well); 7.4 and 8.0 (raw sewage) and 7.2 and 8.2 (Extrabes). The (EC) were 0.957 and 1.002 (Wells); 2,133 and 2,368 (raw sewage) and (Extrabes) 2,502 09 and 2.4 dS m 〈 sup 〉 -1 〈 /sup 〉 . The use of nutritional mineral solutions using wastewater is feasible when used in hydroponic systems, is indicated for mainly for the Brazilian semi-arid region and when it makes use of water of poor quality irrigation in vegetable production. 〈 /p 〉
    Materialart: Online-Ressource
    ISSN: 1981-8203
    URL: Article
    DOI: 10.18378/rvads.v11i2.4569
    Sprache: Unbekannt
    Verlag: Grupo Verde de Agroecologia e Abelhas
    Publikationsdatum: 2016
    ZDB Id: 2406280-7
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  • 7
    Online-Ressource
    Online-Ressource
    Ácido ascórbico e pigmentos fotossintéticos na alface crespa cultivada em sistema hidropônico com soluções salinas
    Research, Society and Development ; 2021
    In:  Research, Society and Development Vol. 10, No. 3 ( 2021-03-08), p. e10510313011-
    Details
    In: Research, Society and Development, Research, Society and Development, Vol. 10, No. 3 ( 2021-03-08), p. e10510313011-
    Kurzfassung: O objetivo desta pesquisa foi determinar os teores de clorofila e vitamina-C nas cultivares da alface (Elba, Cristina e Veneranda) cultivadas em sistema hidropônico com soluções nutritivas apresentando diferentes níveis de salinidade. O experimento foi conduzido na Universidade Estadual da Paraíba,UEPB Campus-II, zona rural da cidade de Lagoa Seca-PB, via técnica Fluxo Laminar de Nutrientes-NFT em ambiente protegido. O delineamento experimental foi em blocos casualizados, em esquema de parcelas subdivididas, as parcelas constituídas por sete soluções nutritivas preparadas a partir da metodologia de Furlani de modo que a solução S1 apresentou Condutividade Elétrica-CE (1,9 dS m-1) e as demais soluções os seguintes valores de CE: S2-2,4; S3-2,9; S4-3,4; S5-3,9; S6-4,4 e S7-4,9 dS m-1, com três repetições. As subparcelas foram compostas pelas cultivares Elba, Cristina e Veneranda. As variáveis analisadas foram: teores de clorofila (Chl a e b) total, carotenoides e vitamina-C. As soluções nutritivas apresentaram comportamento linear para todos os tratamentos não deferindo estaticamente entre si. O maior valor para clorofila total foi obtido na cultivar Veneranda. Para as variáveis (Chl b e total) os maiores teores encontrados foi na cultivar Veneranda, cujos valores foram de 35,97 e 52,06 mg/g-1 respectivamente. O tratamento Elba/S3=3,4 dS m-1 proporcionou o maior teor de carotenoides média de 57 mg/g-1, ainda a cultivar Elba apresentou os maiores teores (Chl a) com as soluções nutritivas S2=2,4 e S3=3,9 dS m-1. A cultivar Veneranda promoveu os maiores teores para (Chl b e total). Os maiores teores de vitamina-C foram encontrados nas cultivares Cristina e Veneranda.
    Materialart: Online-Ressource
    ISSN: 2525-3409
    URL: Article
    DOI: 10.33448/rsd-v10i3.13011
    Sprache: Unbekannt
    Verlag: Research, Society and Development
    Publikationsdatum: 2021
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  • 8
    Online-Ressource
    Online-Ressource
    Application of wastewater for production of lettuce (Lactuca sativa) in hydroponic system
    Southern Cross Publishing ; 2019
    In:  Australian Journal of Crop Science , No. 13(10):2019 ( 2019-10-20), p. 1586-1593
    Details
    In: Australian Journal of Crop Science, Southern Cross Publishing, , No. 13(10):2019 ( 2019-10-20), p. 1586-1593
    Kurzfassung: The study aimed to evaluate the agronomic performance of three varieties of lettuce subjected to different treatments of wastewater. The experimental design was a randomized block in a 7 x 3 split-plot with three replicates. The factors were 7 hydroponic and 3 cultivars of crisp lettuce. The solutions were formulated and optimized by considering Furlani solution as reference nutrient. The experimental portion consisted of the nutritive solutions (S). S1 = Furlani solution; S2 = domestic wastewater; S3 = optimized domestic wastewater; S4 = well water; = S5 optimized well water; S6 = wastewater from the UASB reactor and S7 = wastewater optimized from the UASB reactor, the subplot was constituted of three lettuce cultivars (Verônica, Vanda and Thais). The results showed that solutions with domestic wastewater (S2), optimized domestic wastewater (S3), optimized well water (S5) and the solution wastewater from the UASB reactor (S6) promoted the highest number of leaves per plant for the three cultivars. Solutions with enhanced domestic wastewater (S3), optimum water well (S5) and the solution formulated from the wastewater from the UASB reactor (S6) promoted the highest stem diameter in three cultivars. The highest value of total production was obtained from Vanda cultivar, when the wastewater from the UASB reactor (S6) was used as nutritive solution.
    Materialart: Online-Ressource
    ISSN: 1835-2693 , 1835-2707
    URL: Issue
    URL: Journal
    URL: Article
    DOI: 10.21475/ajcs.19.13.10
    DOI: 10.21475/ajcs
    DOI: 10.21475/ajcs.19.13.10.p1752
    Sprache: Unbekannt
    Verlag: Southern Cross Publishing
    Publikationsdatum: 2019
    ZDB Id: 2413553-7
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 9
    Online-Ressource
    Online-Ressource
    Production of lettuce genotypes in hydroponic system using different organo-mineral nutrient solutions
    Southern Cross Publishing ; 2018
    In:  Australian Journal of Crop Science Vol. 12, No. 03 ( 2018-03-20), p. 386-392
    Details
    In: Australian Journal of Crop Science, Southern Cross Publishing, Vol. 12, No. 03 ( 2018-03-20), p. 386-392
    Materialart: Online-Ressource
    ISSN: 1835-2693 , 1835-2707
    URL: Issue
    URL: Journal
    URL: Article
    DOI: 10.21475/ajcs.18.12.03
    DOI: 10.21475/ajcs
    DOI: 10.21475/ajcs.18.12.03.pne761
    Sprache: Unbekannt
    Verlag: Southern Cross Publishing
    Publikationsdatum: 2018
    ZDB Id: 2413553-7
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 10
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    Online-Ressource
    DESUNIFORMIDADE ESPAÇO-TEMPORAL NO DESEMPENHO DO SISTEMA DE IRRIGAÇÃO POR SULCO
    FapUNIFESP (SciELO) ; 1999
    In:  Revista Brasileira de Engenharia Agrícola e Ambiental Vol. 3, No. 1 ( 1999-04), p. 18-25
    Details
    In: Revista Brasileira de Engenharia Agrícola e Ambiental, FapUNIFESP (SciELO), Vol. 3, No. 1 ( 1999-04), p. 18-25
    Kurzfassung: ABSTRACT The purpose of this research was to evaluate the degree of non-uniformity of furrow irrigation system performance generated by spatial and temporal variations in field and operational parameters. At each irrigation event along the crop season, field evaluations were performed in six furrows chosen in such way to comprise most of the spatial variations. Maximum spatial variations in the application efficiency, tailwater ration and deep percolation ration were equal to 33.0, 162.0 and 140.5%. Spatially, for tho same parametrs the maximum temporal variations were 26.3, 78.4 and 233.3%.
    Materialart: Online-Ressource
    ISSN: 1415-4366
    URL: Article
    DOI: 10.1590/1807-1929/agriambi.v3n1p18-25
    Sprache: Unbekannt
    Verlag: FapUNIFESP (SciELO)
    Publikationsdatum: 1999
    ZDB Id: 2164420-2
    Standort Signatur Einschränkungen Verfügbarkeit
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