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| Registros recuperados: 4.682 | |
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| Picoli,Michelle C. A.; Lamparelli,Rubens A. C.; Sano,Edson E.; Rocha,Jansle V.. |
| Some models have been developed using agrometeorological and remote sensing data to estimate agriculture production. However, it is expected that the use of SAR images can improve their performance. The main objective of this study was to estimate the sugarcane production using a multiple linear regression model which considers agronomic data and ALOS/PALSAR images obtained from 2007/08, 2008/09 and 2009/10 cropping seasons. The performance of models was evaluated by coefficient of determination, t-test, Willmott agreement index (d), random error and standard error. The model was able to explain 79%, 12% and 74% of the variation in the observed productions of the 2007/08, 2008/09 and 2009/10 cropping seasons, respectively. Performance of the model for the... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Synthetic aperture radar; L-band; Modeling; Remote sensing. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000600019 |
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| Campos,Patrick F.; Alves Júnior,José; Casaroli,Derblai; Fontoura,Patricia R.; Evangelista,Adão W. P.. |
| O Estado de Goiás é o segundo maior produtor de cana-de-açúcar do Brasil. Entretanto, ainda apresenta baixa produtividade, devido principalmente à falta de variedades adaptadas a esta região e ao déficit hídrico típico. Assim, objetivou-se avaliar o desempenho de dezesseis variedades de cana-de-açúcar submetidas à irrigação suplementar no Cerrado. O experimento foi conduzido em Goianésia-GO, em um Latossolo Vermelho-Amarelo Distrófico, de textura argilosa de abril de 2011 a maio de 2012. O delineamento foi em blocos casualizados (Bifatorial 16x5), com 16 tratamentos (variedades): CTC2, CTC4, CTC9, CTC11, CTC15, CTC18, IAC87-3396, IAC91-1099, IACSP94-3046, IACSP94-2094, IACSP94-2101, IACSP95-5000, RB857515, RB92579, RB966928 e SP86-0042; e cinco tempos de... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Saccharum officinarum; Déficit hídrico; Manejo da irrigação; Aspersão. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000600010 |
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| Bomfim,Guilherme V. do; Manzano,Juan; Azevedo,Benito M. de; Vasconcelos,Denise V.; Viana,Thales V. de A.. |
| The purpose of this research was to evaluate the K2O distribution uniformity by surface drip irrigation at Universitat Politecnica de Valencia, Valencia, Spain (39º 29′ N, 0º 23′ W, 20 m). The irrigation was performed by drip lines with not-compensated emitters, spaced 0.3 m. The fertigation was realized using a fertilizer injector pump of electric action with injection of 0.25 h. The experimental design used completely randomized blocks with five treatments and four replications. The treatments consisted of injection in five distances, located at 10; 20; 30; 40; 50 m of the first drip line. Samples were collected in emitters located at the start, at 1/3, at 2/3 and at the end of the drip lines. The nutrient concentration was determined by flame... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Uniformity; Chemigation; K2O. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000600011 |
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| Kuczman,Osvaldo; Tavares,Maria H. F.; Gomes,Simone D.; Guedes,Luciana P. C.; Grisotti,Geovane. |
| The cassava starch industries generate a large volume of wastewater effluent that, stabilized in ponds, wastes its biogas energy and pollutes the atmosphere. To contribute with the reversion of this reality, this manipueira treatment research was developed in one phase anaerobic horizontal pilot reactor with support medium in bamboo pieces. The reactor was excavated into the ground and sealed with geomembrane in HDPE, having a volume equal to 33.6 m³ and continuous feeding by gravity. The stability indicators were pH, volatile acidity/total alkalinity ratio and biogas production. The statistical analyses were performed by a completely randomized design, with answers submitted to multivariate analysis. The organical loads in COD were 0.556; 0.670; 0.678 and... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Biodigester; Biogas; Anaerobic digestion; Cassava; Cassava wastewater. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000600021 |
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| Coelho,Eugênio F.; Andrade Neto,Torquato M. de; Barros,Damiana L.. |
| The Fertigation is the combined application of water and nutrients to a crop. It can be adapted to all types of agricultural crops. The objective of this study was to evaluate the effect of urea concentration in irrigation water on electrical conductivity of the soil solution and saturation extract along the first cycle of banana cv. Terra Maranhão. The experiment followed a completely randomized design with six treatments and ten replications. Treatments regarded for using three urea concentrations (1.0; 2.5 and 4.0 g L-1) in irrigation water applied by two micro irrigation systems (microsprinkler and drip). Results showed that there was a linear elevation of electrical conductivity of saturation extract and soil solution with the increase on... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Urea; Salinity; Fertirrigation. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000600007 |
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| Cardoso,Gabriel G. de G.; Klar,Antônio E.. |
| O objetivo deste artigo é apresentar um estudo envolvendo uma relação entre a perda de carga localizada em conexões de emissores em tubulações, com diferentes diâmetros, utilizados em irrigação localizada, com a geometria dos conectores de emissores "online", que permite a fácil quantificação dessas perdas de carga, uma vez conhecida a dimensão dos conectores. O experimento foi conduzido para Números de Reynolds no intervalo de fluxo turbulento, obtidos pela variação da vazão nos tubos a uma temperatura constante da água. Para os tubos considerados, os resultados da investigação indicaram que o fator de atrito da equação de Darcy-Weisbach pode ser estimado pela Equação de Blasius com os coeficientes b = 0,300 e m = 0,25 para a determinação da perda de... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Perda de carga localizada; Equação de Blasius; Número de Reynolds. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000600008 |
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| Petrini,Maria A.; Rocha,Jansle V.. |
| In Brazil, the State of Goiás is one of sugarcane expansion's frontiers to meet the growing demand for biofuels. The objective of this study was to identify the municipalities where there were replacement of annual crops (mainly grains) by sugarcane in the state of Goiás, as well as indicate correlations between the sugarcane expansion and the family farming production, in the period between 2005 and 2010. For this purpose, grains crop mask and sugarcane crop mask, obtained from satellite images, were intersected using geoprocessing techniques. It was also used IBGE data of sugarcane production and planted area, and data of family farming production linked with the National Food Acquisition Program (PAA), in relation to the number of cooperatives and... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Geoprocessing; Ethanol; National Food Acquisition Program (PAA). |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000600023 |
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| Curi,Thayla M. R. de C.; Vercellino,Rimena do A.; Massari,Juliana M.; Souza,Zigomar M.; Moura,Daniella J. de. |
| O sistema de ventilação e de resfriamento utilizado em instalações para frangos de corte desempenha um papel importante no controle ambiental, possibilitando que a ave expresse seu potencial máximo de produção. Nesse sentido, o objetivo deste trabalho foi avaliar, por meio da geoestatística, a influência do sistema de ventilação e das diferentes tipologias construtivas em relação ao ambiente térmico e aéreo em aviários de frangos de corte na fase final de criação. Os aviários avaliados com sistema de ventilação artificial de pressão negativa, por meio de exaustores, foram: Blue House com nebulizadores na entrada de ar e vedação de cortinas; Dark House com painel evaporativo (tijolo cerâmico) e vedação de cortinas e Solid Wall com painel evaporativo... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Avicultura; Conforto térmico; Qualidade do ar; Sistema de ventilação. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000600004 |
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| Bezerra,Francicso M. L.; Freitas,Cley A. S. de; Silva,Alexandre R. A. da; Mota,Suetônio de B.; Aquino,Boanerges F. de. |
| The objective of this study was to evaluate the productive performance of sunflower plants irrigated with different levels of domestic treated sewage and groundwater well with different doses of nitrogen. It was used randomized blocks design in split-split plots with four replications. In the plots, we evaluated the effect of two types of irrigation water, in the subplots we evaluated the five irrigation levels expressed as 25, 50, 75, 100 and 125% of the Class A pan Evaporation (CAE), and in the sub subplots, we evaluated the effect of four different doses of nitrogen (25, 50, 75 and 100 kg ha-1). The irrigation of sunflower with domestic sewage produced greater yield potential of grain and oil. The use of water from treated wastewater can replace up to... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Helianthus annuus; Recycle; Drip irrigation; Nitrogen fertilization. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000600014 |
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| Registros recuperados: 4.682 | |
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