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Registros recuperados: 13
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Alcohol production from sweet potato (Ipomoea batatas (L.) Lam.) genotypes in fermentative medium Acta Agron. (Palmira)
Cantos-Lopes,Amanda; Vilela-de Resende,Juliano Tadeu; Machado,José; Perez-Guerra,Edson; Vilela-Resende,Nathalia.
Abstract Ethanol is one of the most promising fuels in Brazil, but its production is centralized in sugarcane cultivation, and is currently in search for other sources alcohol producing biomass to replace sugarcane monoculture. The aim of this study was to study fermentation process variables such as fermentation time (72 and 96 hours), addition of nutrients (with and without addition) and yeasts (dry and fresh organic yeast), employed in ethanol production from two sweet potato (Ipomoea batatas (L.) Lam.) genotypes: UGA 05 and UGA 77. Alcohol evaluation content in °GL was performed in a completely randomized design according to two factorial schemes (22 and 23), and results obtained were analyzed using Design Expert® software version 8. Results of the...
Tipo: Journal article Palavras-chave: Biofuel; Ethanol production; Fermentation; Saccharification; Starch; Water content.
Ano: 2018 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000200231
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Avaliação hídrica de um latossolo vermelho submetido a sistemas de manejo. Repositório Alice
PEREIRA, F. S.; ANDRIOLI, I.; MARTINS, A. L. S..
O conteúdo de água em sistemas de preparo do solo são essenciais para avaliar a sustentabilidade agrícola. O objetivo deste estudo foi avaliar os efeitos do teor de água em um Latossolo Vermelho distrófi co sob diferentes sistemas de manejo: 1) Crotalária (Crotalaria juncea), em sistema de semeadura direta (SDC); 2) Milheto (Pennisetum americanum sin. Tiphoydes), em sistema de semeadura direta (SDM); 3) Lablabe (Dolechus lablab), em sistema de semeadura direta (SDL); 4) Semeadura convencional após uma gradagem aradora e duas niveladoras (SSC) e 5) pousio. A propriedade física do solo foi avaliada nas camadas 0,5-0,10 m e 0,15-0,20 m . A curva de retenção de água foi mais influenciada pelo SDM na camada 0,5-0,10 m.
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Curva de retenção de água no solo; Sustentabilidade; Plantio direto; Latossolo vermelho; Oxisols; Tillage; Water content.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1002763
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Desenvolvimento e calibração de uma guia de onda para TDR. Repositório Alice
ANDRADE, C. L. T.; OR, D.; COSTA, E.L.; COUTO, L.; ALBUQUERQUE, P. E. P..
A medicao da umidade do solo e crucial para pesquisa e manejo de irrigacao. Entre os metodos mais recentes de determinacao de umidade esta o da TDR ("time domain reflectometry") que se baseia na correlacao entre a propriedade dieletrica do solo e a sua umidade. A obtencao do perfil de umidade do solo requer a utilizaco de um grande numero de guias de onda, cujo custo ainda e elevado. Por outro lado, as curvas de calibracao relacionando umidade com constante dieletrica do solo foram desenvolvidas para solos de paises temperados. Os objetivos desse trabalho foram construir uma guia de onda com materiais facilmente encontrados no mercado nacional e calibra-la para solos tropicais. As curvas de calibracao para areia quartzosa e latossolo vermelho escuro sao...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Solo; Umidade; Irrigacao; Instrumentacao; Soil; Water content; Irrigation; Instrumentation.
Ano: 2001 URL: http://www.alice.cnptia.embrapa.br/handle/doc/485175
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Distribución espacial del amonio en fiordos y canales comprendidos entre Puerto Montt y Laguna San Rafael en período de primavera OceanDocs
Prado-Fiedler, R..
An oceanographic expedition was carried out between October 18th and November 15th 1995 in the inlets region and fjords located between Puerto Montt (41° 20’S and San Rafael Lagoon (46° 40’ S) in Southern Chile. The main purpose of the present work is to characterise the spatial distribution of ammonium and its concentration range in the studied region during spring onset. Water samples were collected from a total of 101 oceanographic stations of the expedition Cimar-Fiordo 1. The main part of the water body showed concentrations lower than 1 µmol/L. The higher ammonium concentrations were found in the continental fjords, specially in the area situated south of the narrows of Meninea island, where subsurface maximums greater than 2 µmol/L were found. The...
Tipo: Journal Contribution Palavras-chave: Fjords; Water properties; Ammonia; Water content; Channels; Water analysis; Water sampling; Surface layers; Core layers (water); Sea water; Fjords; Water content; Ammonia; Water analysis; Sea water; Http://aims.fao.org/aos/agrovoc/c_16314; Http://aims.fao.org/aos/agrovoc/c_15852; Http://aims.fao.org/aos/agrovoc/c_349; Http://aims.fao.org/aos/agrovoc/c_16064; Http://aims.fao.org/aos/agrovoc/c_6903.
Ano: 2000 URL: http://hdl.handle.net/1834/1576
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Estudio del crecimiento del maíz bajo condiciones de temporal mediante la captación de agua de lluvia Colegio de Postgraduados
Torres Suárez, Sandra Luz.
El trabajo de investigación fue conducido en el campo experimental del campus Montecillo del Colegio de Postgraduados. Cuyo objetivo principal fue observar si existe afectación en el contenido de agua presente en el suelo, debida a una conformación diferente de surcos y la colocación de contras a lo largo de los mismos. La variedad de semilla utilizada fue San Josecito, sembrada el día 2 de junio de 2006. El diseño experimental fue el de Bloques Completos con Tratamientos Aleatorizados, con 4 repeticiones, disponiéndose de una superficie total de 1500 m2. Los tratamientos probados consistieron en: Arada pacial con contras a cada 3 m (Trat A), surco tipo Anaya (inclinado) con contras a cada 3 m (Trat B), Surco normal con contras a cada 3 m (Trat C)...
Tipo: Tesis Palavras-chave: Maíz; Microcuencas; Termporal; Contenido de humedad; Maestría; Hidrociencias; Corn; Micro-basins; Rainfed; Water content.
Ano: 2008 URL: http://hdl.handle.net/10521/1520
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Etude preliminaire des equilibres de distribution de l'eau et des ions au cours de l'ovogenese de Solea solea ArchiMer
Gallis, J; Lemenn, F; Lebrun, A; Nunez, R.
During oogenesis of Solea solea L., gonadal changes in water, Na super(+) and K super(+) ions seem to be related to yolk protein incorporation by the oocyte. The decrease in oocyte water accumulation, associated with an increase in pericellular water accumluation and a decrease in K super(+) concentration occurs when vitellogenin enters the oocyte. Na super(+) concentration decreases in the oocyte at the end of the exogenous vitellogenesis when the first stages of the oocyte maturation take place. Water accumulation in the pericellular space during vitellogenesis allows the rapid transfer of water from this compartment into the oocyte during the terminal phase of maturation. However the total amount of gonadal water remains stable.
Tipo: Text Palavras-chave: Solea solea; Soleidae; Pisces; Hydration; Water content; Ion accumulation; Sexual maturity; Ovaries; Oogenesis; Solea; Maturation ovocytaire; Ovogenèse; Eau; Ions.
Ano: 1983 URL: http://archimer.ifremer.fr/doc/1983/acte-1231.pdf
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Exploratory Repositório Alice
FIGUEIREDO, M. A. de; COELHO, S. V. B.; ROSA, S. D. V. F. da; VILELA, A. L.; SILVA, L. C..
Cryopreservation is a viable option for conservation of coffee germplasm. However, for this technique to be completely successful, it is of fundamental importance to carry out studies that ensure maintenance of cell integrity before and after immersion in liquid nitrogen (LN). Therefore, the aim in this study was to investigate the water content, cooling rate, and final temperature most suitable for cryopreservation of Coffea arabica L. seeds. The seeds were dried by silica gel to water contents of 5, 10, 15, 20, 30 and 40 % wb, subjected to slow cooling treatments at speeds of -1, -3 and -5 °C min.-1 to final temperatures of -40, -50 and -60 °C and then directly immersed in LN. After storage, seeds were rewarmed at 40 °C for two minutes. The survival rate...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Coffee; Slow cooling; Liquid nitrogen; Sílica gel; Teor de água; Resfriamento lento; Nitrogênio líquido; Café; Silica gel; Water content.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1081992
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Field Performance of a Winged Scarifier as a Function of Soil Compaction and Water Content Chilean J. Agric. Res.
Cholaky,Carmen; Cisneros,José M; Balbuena,Roberto.
Initial soil conditions, operational aspects, and tool shape affect the efficiency of soil decompaction. The objective of this study was to evaluate the performance of a winged scarifier as a function of soil compaction and edaphic water content. The experiment was carried out in a typical Hapludoll. Treatments considered two soil compaction levels: high (HC) and low compaction (LC); and three soil water contents: wet (WS), humid (HS), and dry (DS) with 9, 14, and 19% gravimetric water content, respectively. A split-plot randomized block design was applied. Tractive effort, disturbed area, tillage depth, specific resistance, and power were evaluated. Results showed that tractive effort was 17% greater in HC than LC, and in both cases HS was greater than WS...
Tipo: Journal article Palavras-chave: Agricultural engineering; Winged scarifier; Bulk density; Water content; Compaction.
Ano: 2010 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000100016
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Geoelectric method applied in correlation between physical characteristics and electrical properties of the soil. Repositório Alice
SILVA FILHO, A. M.; SILVA, C. L. B.; OLIVEIRA, M. A. A.; PIRES, T. G.; ALVES, A. J.; CALIXTO, W. P.; NARCISO, M. G..
This paper presents the study of the relationship between electrical properties and physical characteristics of the soil. Measures of apparent electrical resistivity of the soil were made for different types of soil, varying moisture content gradually while maintaining a constant compaction, and then varying the compaction and relating it to a constant humidity. Development of a correlation surface is proposed in order to identify granulometry of the soil from moisture and compaction measurements. For the study of spatial variability, two areas were chosen to allow the change of moisture content and compaction in order to verify the measurement capacity of apparent electrical resistivity of the soil as methodology to identify change in soil dynamics....
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Apparent electrical resistivity; Geoelectric prospecting; Water content; Soil compaction; Soil properties.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1078731
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Nitrogen and phosphorus species of Lake Burullus Water (Egypt) OceanDocs
Okbah, M.A..
Water samples collected from Lake Burullus were analyzed to investigate temporal and spatial variations of phosphorus and nitrogen species during the period from January to October 2003. The concentrations of dissolved inorganic nitrogen (DIN), dissolved organic nitrogen (DON), particulate nitrogen (PN) and total nitrogen (TN) were in the ranges of 4.10-107.51mole l-1 ; 7.43-170.10mole l-1; 9.33-209.4mole l-1 and 51.40-259.0 mole l-1 respectively. DIN, DON and PN species represent 19%, 34% and 47% of the total nitrogen content, respectively. Significant variations for the concentrations of the phosphorus forms have been found in this study. Concentrations of reactive phosphate (PO4), dissolved organic phosphorus (DOP), particulate phosphorus (PP) and...
Tipo: Journal Contribution Palavras-chave: Water samples; Water content; Nitrogen; Nutrients; Phosphorus; Http://aims.fao.org/aos/agrovoc/c_5192; Http://aims.fao.org/aos/agrovoc/c_5274; Http://aims.fao.org/aos/agrovoc/c_5804.
Ano: 2005 URL: http://hdl.handle.net/1834/1263
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Temporal and spatial variability of structure dependent properties of a volcanic ash soil under pasture in southern Chile Chilean J. Agric. Res.
Dec,Dorota; Dörner,José; Balocchi,Oscar.
Prairies are a main source for livestock feeding in southern Chile. The aim of this research was to define how grazing events and natural wetting and drying cycles (WD) affect the spatial and temporal variability of the soil’s structural properties. The investigation was conducted in a Duric Hapludand, Valdivia Series. Penetration resistance (PR) and volumetric water content (WC), measured in situ, were used to prepare maps which show i) temporal (1383 to 3047 kPa for 46 to 16% WC) and spatial changes, and ii) grazing events as an important factor influencing spatial changes in PR (differences of 3421 kPa between max and min values). Grazing and WD cycles induced changes in the soil’s mechanical stability and pore functions, which indicate that...
Tipo: Journal article Palavras-chave: Penetration resistance; Water content; Mechanical strength; Porous system; Andisol.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000200015
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WATER REQUIREMENTS AND WATER USE EFFICIENCY OF CARROT UNDER DRIP IRRIGATION IN A HAPLOXERAND SOIL J. Soil Sci. Plant Nutr.
Quezada,C; Fischer,S; Campos,J; Ardiles,D.
Water management efficiency is a key issue for sustainable agriculture development, since it is necessary to get a higher biomass production per unit of applied water. This study aimed to determine both water requirements and water use efficiency (WUE) and their effect on yield and quality parameters in carrots (Daucus carota L.), during the 2006 - 2007 growing season in Chilian, Chile (36° 35' 43.2" S, 72° 04' 39" W, 140 m altitude). The water treatments applied were 25, 50, 75, 100 and 125 % pan evaporation (Epan) in a Haploxerand soil under drip irrigation. The results showed that the highest crop yield was obtained with 100% Epan treatment. However, the highest WUE was found in the 75% Epan treatment equivalent to 3864 m³ ha-1, which is the recommended...
Tipo: Journal article Palavras-chave: Water content; Roots quality; Water stress; Andisols.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162011000100002
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熱風乾燥處理對宜蘭白蒜種蒜品質與發芽之影響 Taiwan Agricultural Research Institute
王怡玎; Yee-Ting Wang.
[[abstract]]`宜蘭白蒜'種蒜球分別以25°、30°、35°或40℃熱風乾燥0、10、20或30日,然後比較各處理對種蒜球品質與發芽之影響。以40℃乾燥10日導致種蒜球大幅升高呼吸率及失重率,並使其外膜重度凹陷,蒜肉軟化呈水浸狀透明,喪失發芽能力。種蒜球以25°、30°或35℃乾燥10日即可使蒜膜及梗盤乾燥,球體硬實,呼吸率降低。以25℃乾燥20或30日,或以30°、35℃乾燥10、20或30日皆有促使種蒜球在20℃定溫箱中播植後提早1週發芽,提高發芽率與發芽整齊度及加速芽伸長的效果。各種處理比較,以35℃乾燥處理30日效果最好,30℃ 乾燥30日或35℃乾燥10日或20日的效果也相當接近,至於25℃乾燥之效果則較差。以35℃乾燥處理10、20或30日,或以30℃乾燥30日皆可使種蒜球播植後提早3至4週達到(或接近)100%發芽,而且使發出的芽較快速伸長,應可應用於必須採用剛收穫的種蒜球栽培青蒜的生產。
Palavras-chave: 熱風乾燥 呼吸率 含水率 芽長比 發芽率 Hot-air drying; Respiration rate; Water content; Length ratio of bud vs. clove; Germination percentage [[classification]]6.
Ano: 2003
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