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  • 1
    Online Resource
    Online Resource
    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
    Abstract: 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.
    Type of Medium: Online Resource
    ISSN: 1413-7054
    URL: Article
    DOI: 10.1590/S1413-70542005000400006
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2005
    detail.hit.zdb_id: 2021028-0
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  • 2
    Online Resource
    Online Resource
    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
    Abstract: 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%.
    Type of Medium: Online Resource
    ISSN: 1415-4366
    URL: Article
    DOI: 10.1590/1807-1929/agriambi.v3n1p18-25
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 1999
    detail.hit.zdb_id: 2164420-2
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  • 3
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    Online Resource
    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-
    Abstract: 〈 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 〉
    Type of Medium: Online Resource
    ISSN: 1981-8203
    URL: Article
    DOI: 10.18378/rvads.v11i2.4569
    Language: Unknown
    Publisher: Grupo Verde de Agroecologia e Abelhas
    Publication Date: 2016
    detail.hit.zdb_id: 2406280-7
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  • 4
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    Online Resource
    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
    Abstract: 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 
    Type of Medium: Online Resource
    ISSN: 1808-8546 , 1413-7895
    URL: Issue
    URL: Article
    DOI: 10.15809/irriga.2009v14n4
    DOI: 10.15809/irriga.2009v14n4p481-491
    Language: Unknown
    Publisher: Brazilian Journal of Irrigation and Drainage - IRRIGA
    Publication Date: 2009
    detail.hit.zdb_id: 2410931-9
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  • 5
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    AVALIAÇÃO DAS CARACTERÍSTICAS HIDRÁULICAS DO TUBO PERFURADO SANTAPE
    FapUNIFESP (SciELO) ; 1999
    In:  Revista Brasileira de Engenharia Agrícola e Ambiental Vol. 3, No. 3 ( 1999-12), p. 316-321
    Details
    In: Revista Brasileira de Engenharia Agrícola e Ambiental, FapUNIFESP (SciELO), Vol. 3, No. 3 ( 1999-12), p. 316-321
    Abstract: ABSTRACT The hydraulic characteristics of the Santape were determined, which is a perforated flexible polyethylene linear tube, of low density, with orifices made by laser rays. The discharge-pressure relationship, the manufacturing variation coefficient of the orifices, the inner diameters of tube and its wall rupture as a function of pressure variation, the reach and height of the water jet, and the discharge as a function of the tube length were evaluated. The emitters presented mean value for the manufacturing variation coefficient equal to 4.10% and a turbulent regime (discharge exponent of 0.5646). An increase in the inner diameter of the tube was verified as the pressure increased and the rupture of the wall occurred at 169.30 kPa pressure. The discharge as a function of the tube length varied from 11.25 to 7.09 L h-1 m-1, data obtained experimentally for tube lengths from 10 to 200 m and pressure equal to 80 kPa.
    Type of Medium: Online Resource
    ISSN: 1415-4366
    URL: Article
    DOI: 10.1590/1807-1929/agriambi.v3n3p316-321
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 1999
    detail.hit.zdb_id: 2164420-2
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  • 6
    Online Resource
    Online Resource
    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-
    Abstract: 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.
    Type of Medium: Online Resource
    ISSN: 1916-9760 , 1916-9752
    URL: Article
    DOI: 10.5539/jas.v10n7p317
    Language: Unknown
    Publisher: Canadian Center of Science and Education
    Publication Date: 2018
    detail.hit.zdb_id: 2501913-2
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  • 7
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    Online Resource
    Crescimento da cana-de-açúcar com e sem irrigação complementar sob diferentes níveis de adubação de cobertura nitrogenada e potássica
    INOVAGRI ; 2009
    In:  Revista Brasileira de Agricultura Irrigada Vol. 3, No. 1 ( 2009-06-20), p. 03-12
    Details
    In: Revista Brasileira de Agricultura Irrigada, INOVAGRI, Vol. 3, No. 1 ( 2009-06-20), p. 03-12
    Type of Medium: Online Resource
    ISSN: 1982-7679
    URL: Issue
    URL: Journal
    URL: Article
    DOI: 10.7127/rbai.v3n1
    DOI: 10.7127/suffix
    DOI: 10.7127/rbai.v3n100012
    Language: Unknown
    Publisher: INOVAGRI
    Publication Date: 2009
    detail.hit.zdb_id: 2931097-0
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  • 8
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    Online Resource
    FUNÇÕES DE RESPOSTA DO CAPIM BUFFEL AO USO DA ÁGUA E ÉPOCA DE CORTE
    Brazilian Journal of Irrigation and Drainage - IRRIGA ; 1999
    In:  IRRIGA Vol. 4, No. 3 ( 1999-04-27), p. 107-112
    Details
    In: IRRIGA, Brazilian Journal of Irrigation and Drainage - IRRIGA, Vol. 4, No. 3 ( 1999-04-27), p. 107-112
    Abstract: FUNÇÕES DE RESPOSTA DO CAPIM BUFFEL AO USO DA ÁGUA E ÉPOCA DE CORTE   José Dantas NetoHamilton Medeiros de AzevedoCarlos Alberto Vieira de AzevedoHugo Orlando Carvallo GuerraUFPB - CCT - Departamento de Engenharia AgrícolaFone: (083) 310 -1318; fax : (083) 310 - 1011CEP 58109 - 970, Campina Grande - PB    1 RESUMO   O experimento teve como objetivo encontrar as funções de respostas do capim Buffel, em níveis de água e época do primeiro corte, para obtenção de alternativas que promovam melhores condições de manejo dessa forrageira. O delineamento experimental foi em blocos ao acaso com seis repetições. Os tratamentos constaram da combinação de  cinco  lâminas totais de água  (W1=118; W2=140; W3=199;  W4=373 e W5=470 mm) e seis épocas de corte (E1=35; E2=50; E3=65; E4=80; E5=95 e  E6=110 dias ). As lâminas foram aplicadas com um sistema de aspersão em linhas. Com um  manejo adequado do capim buffel obtêve-se  excelentes rendimentos anuais de matéria seca.  O modelo de superfície de resposta ajustado apresentou um coeficiente de determinação igual a 0,89. O ponto de máximo rendimento de matéria seca estimada (4498 kg/ha) ocorreu para uma lâmina de irrigação de 345 mm e uma época de corte de 88 dias. Observou-se  uma maior influência das lâminas totais aplicadas, no rendimento de matéria seca, que a época do primeiro corte.   UNITERMOS: irrigação, produtividade, manejo.   DANTAS NETO, J., AZEVEDO, H. M., AZEVEDO, C. A. V., CARVALLO, H. O. Response functions of the buffel grass to the use of irrigation and cutting time   2 ABSTRACT  The experiment had the purpose of finding the response functions of the Buffel grass, to different levels of irrigation and first cutting period, seeking for alternatives that would establish better management strategies for this crop. The experiment were subjected to a random statistical design with six replications. The treatments consisted of combining five water depths (W1=118, W2=140, W3=199, W4=373, and W5=470 mm) and six cutting periods (E1=35, E2=50, E3=65, E4=80, E5=95, and E6=110 days).  The water depths were applied by a  line source sprinkler system.  The fitted surface response model presented a determination coefficient equal to 0,89.  The maximum yield point of estimated dry matter (4498 kg/ha) occurred for an irrigation depth equivalent to 345 mm and a 88-day cutting time.  It was verified that the applied water depths had more effect on the dry matter yield than at the first cutting period.   KEYWORDS: irrigation, yield, management
    Type of Medium: Online Resource
    ISSN: 1808-8546 , 1413-7895
    URL: Issue
    URL: Article
    DOI: 10.15809/irriga.1999v4n3
    DOI: 10.15809/irriga.1999v4n3p107-112
    Language: Unknown
    Publisher: Brazilian Journal of Irrigation and Drainage - IRRIGA
    Publication Date: 1999
    detail.hit.zdb_id: 2410931-9
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  • 9
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    Online Resource
    PERFORMANCE HIDRÁULICA E PERFIL DE DISTRIBUIÇÃO DE ÁGUA DO MICROASPERSOR NAAN 7110, SOB DIFERENTES CONDIÇÕES DE VENTO
    FapUNIFESP (SciELO) ; 1997
    In:  Revista Brasileira de Engenharia Agrícola e Ambiental Vol. 1, No. 1 ( 1997-12), p. 57-61
    Details
    In: Revista Brasileira de Engenharia Agrícola e Ambiental, FapUNIFESP (SciELO), Vol. 1, No. 1 ( 1997-12), p. 57-61
    Abstract: ABSTRACT The main purpose of testing equipments used in trickle irrigation systems consists of determining its hydraulic characteristics and analyzing its performance. Aiming to supply subsidies for an adequate design of trickle irrigation systems, a research was developed under laboratory and field conditions, in area belonging to the Irrigation and Drainage Engineering Laboratory at the of Paraíba, Federal University, in order to evaluate the performance of the microsprinkler NAAN 7110. In field, the emitter was tested for the wind speeds in the strips of 0-2, 2-4, 4-6 and 6-8 km/h. The tests sought the determination of the following parameters: manufacturing variation coefficient; characteristic equation of the relationship between pressure and discharge; and the average effective wetted diameter in laboratory and field. The analysis showed that the microsprinkler NAAN 7110 presents an excelente manufacturing uniformity, with a manufacturing variation coefficient (CVF) equal to 0,049. The best fitness for the pressure and discharge relationship was performed by the potential model, which presented a determination coefficient equal to 0,99. Under the conditions in which the tests were performed, there was not differentiation between the values of the average wetted diameter obtained in laboratory (5.7 m) and in field (5,7 m). However, the effective wetted diameter was larger in field (5.7 m) then in laboratory (4.5 m).
    Type of Medium: Online Resource
    ISSN: 1415-4366
    URL: Article
    DOI: 10.1590/1807-1929/agriambi.v1n1p57-61
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 1997
    detail.hit.zdb_id: 2164420-2
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  • 10
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    USO DA PROGRAMAÇÃO LINEAR PARA ESTIMAR O PADRÃO DE CULTURA DO PERÍMETRO IRRIGADO NILO COELHO
    FapUNIFESP (SciELO) ; 1997
    In:  Revista Brasileira de Engenharia Agrícola e Ambiental Vol. 1, No. 1 ( 1997-12), p. 9-12
    Details
    In: Revista Brasileira de Engenharia Agrícola e Ambiental, FapUNIFESP (SciELO), Vol. 1, No. 1 ( 1997-12), p. 9-12
    Abstract: ABSTRACT The irrigation district managers must plan early how available water should be used, given its large demand. It is known that a relationship between demand and water availability exists, because the crop patterns have the tendency to adjust to the water availability. The purpose of this research was to study the crop pattern for the Nilo Coelho, PE irrigation district, using a linear programming model. The linear programming technique has been widely used for representing this kind of production system, mainly for planning purposes in new areas or for improving the irrigation projects already in operation. The studied model is a traditional linear programming formulation, in which the objective function consisted into maximizing the net income of the project using the most cultivated crops in the area, under irrigation conditions. The restrictions to the objective function were the monthly and annual water volume, land and marketing. The maximization of profits in the colonization area of the Nilo Coelho project, given by the linear programming model, was equal to US$ 22,634.044, for the following crop pattern: beans (714 ha); watermelon (714 ha); green pepper (714 ha); tomato (428 ha); onion (357 ha); and banana (818 ha). The annual water availability presented an opportunity cost equal to 0.28 (US$.m-3) and was the strongest restriction, contrary to the monthly availabilities.
    Type of Medium: Online Resource
    ISSN: 1415-4366
    URL: Article
    DOI: 10.1590/1807-1929/agriambi.v1n1p9-12
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 1997
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