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| Registros recuperados: 25 | |
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| Mendonça,Thaís G.; Silva,Marília B. da; Pires,Regina C. de M.; Souza,Claudinei F.. |
| ABSTRACT Agriculture is one of the segments that most uses water and developments have been made to save irrigation water. Deficit irrigation is a technique that can contribute to production and water saving in agriculture. This study aimed to evaluate the viability of deficit irrigation in tomato production irrigated by subsurface drip in a greenhouse and estimate water saving. The experiment was conducted at the CCA/UFSCar, in Araras, São Paulo, Brazil, with grape tomato cultivation. It consisted of three treatments, 100 % water depth and deficit irrigation (75 and 50 % of water depth), with a randomized block design. Irrigation management was performed using mean soil moisture data collected through TDR probes installed in each treatment. Tomato plants... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: TDR; Water resources; Irrigation management; Water content. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000400453 |
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| Corrêa,Paulo Cesar; Baptestini,Fernanda Machado; Zeymer,Juliana Soares; Araujo,Marcos Eduardo Viana de; Freitas,Rita Cristina Pereira de; Leite,Rildo Araujo. |
| ABSTRACT Dehydration of plant products extends its shelf life and reduces its mass and volume, which increases transport and storage efficiency and adds value to food. However, it is an intensive process in energy and time, making necessary the search for more efficient technologies, Thus, this study aimed to investigate the infrared ginger dehydration process by approaching the constant period of dehydration to the theory of mass and heat transfer process to the wet bulb thermometer and the decreasing period of dehydration to liquid diffusion theory. We submitted 5.0 mm thickness and 2.0 cm diameter slices to a dryer with infrared radiation at 50, 60, 70, 80, 90 and 100 °C until constant mass. Heat and mass transfer coefficients, and effective diffusion... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Modified Henderson and Pabis; Radiation; Water content; Zingiber officinale. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542019000100400 |
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| Mansour, Rassoul; Rioual, S.; Lescop, B.; Talbot, P.; Abboud, M.; Farah, W.; Tanné, G.. |
| In this study, a sensor based on the development of a planar antenna immersed in sediments dedicated to water content monitoring in this type of material is proposed and experimentally validated. It is produced by a conventional Printed Circuit Board (PCB) manufacturing process on a double-sided metalized FR4 substrate. The sensitivity of the sensor is ensured by the variation of the real part of the complex dielectric permittivity of sediments with water content at around 1 GHz. As shown, in this frequency range, electrode polarization and Maxwell–Wagner polarization e ects become negligible, leading to only a bulk water polarization sensitivity. The sensor operates in the reflection mode by monitoring the variation of the resonant frequency as a function... |
| Tipo: Text |
Palavras-chave: Resonant sensor; Water content; Dielectric characterization; Microwave; Antenna; Sediments. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00610/72167/70939.pdf |
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| Alkimim,Emilly R.; David,Andréia M. S. de S.; Sousa,Tiago V.; Rodrigues,Cleiton G.; Amaro,Hugo T. R.. |
| ABSTRACT The season of harvest is one of the most important factors influencing seed quality. This study evaluated the effect of different harvesting times on the physiological quality of Coriandrum sativum L. seeds, cv. Palmeira. The experimental design was completely randomized, with six treatments (harvest times) and four replications. The experiment was conducted during the months of April to October 2010. The first moment to harvest seeds was carried out 15 days after full bloom, when approximately 50% of plants were in flowering phase. Other harvests (22, 29, 36, 43 and, 50 days after bloom) were carried out at 7 days intervals until the seeds reached 16.0% of moisture, which occurred in the 6th harvest. Immediately after each harvest, the seeds were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coriandrum sativum L.; Germination; Vigor; Water content. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000200133 |
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| 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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| 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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| Coradi,Paulo C.; Sousa,Alisson H. S. de; Camilo,Lucas J.; Lima,Roney E.; Milane,Lélia V.; Lemes,Ângelo F. C.. |
| ABSTRACT The aim was to evaluate the physical quality of conventional and transgenic corn grains, through drying and wetting processes for marketing. The experimental design was completely randomized in a factorial scheme (7 x 3 x 2), corresponding to seven drying times (0, 20, 40, 60, 80, 100 and 120 min), three temperatures of the drying air (80, 100 and 120 °C) and two hybrids of corn (conventional AG 1051 and transgenic Herculex@ 30S31H). Grain drying was held in convection oven with forced air ventilation while the wetting was done in a B.O.D chamber. The water movement in the grain, the volume and the electrical conductivity were evaluated periodically. The results showed that the transgenic corn grain reduced the negative effects of drying and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: AG 1051; Herculex@ 30S31H; Water content; Temperature. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000900847 |
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| Smiderle,Oscar José; Souza,Aline das Graças; Alves,José Maria Arcanjo; Barbosa,Cylles Zara dos Reis. |
| ABSTRACT The aim of this study was to evaluate physiological quality in the seeds of four cowpea cultivars during nine months of storage. The cowpea cultivars used were BRS Mazagão, UFRR Grão Verde, Pretinho Precoce 1 and BRS Guariba, produced intercropped with cassava in the experimental area of the Centre for Agrarian Science of the Federal University of Roraima, in Boa Vista. After harvest, the seeds were dried, hand cleaned, placed in PET bottles and stored for nine months at a temperature of 23 ºC and a relative humidity of 60% at the Seed Analysis Laboratory of Embrapa Roraima. Data analysis was carried out in a completely randomised design, in a 4 x 4 factorial scheme with eight replications. The physiological quality of the seeds was evaluated at... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vigna unguiculata; Water content; Test for vigour. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000500817 |
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| Moreira,Wagner Henrique; Tormena,Cássio Antônio; Betioli Junior,Edner; Figueiredo,Getulio Coutinho; Silva,Álvaro Pires da; Giarola,Neyde Fabíola Balarezo. |
| The least limiting water range (LLWR) has been used as an indicator of soil physical quality as it represents, in a single parameter, the soil physical properties directly linked to plant growth, with the exception of temperature. The usual procedure for obtaining the LLWR involves determination of the water retention curve (WRC) and the soil resistance to penetration curve (SRC) in soil samples with undisturbed structure in the laboratory. Determination of the WRC and SRC using field measurements (in situ ) is preferable, but requires appropriate instrumentation. The objective of this study was to determine the LLWR from the data collected for determination of WRC and SRC in situ using portable electronic instruments, and to compare those determinations... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Water content; Instrumentation; Critical bulk density; Soil physical quality; Matric potential. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000600012 |
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| Chudasama,Rita S.; Thaker,Vrinda S.. |
| Changes in endogenous gibberellic acid (GA) levels were determined in developing seeds and pods of pigeon pea (Cajanus cajan). Antibodies against GA3 were raised in rabbits and indirect ELISA developed to estimate GA level. Two varieties, black seeded variety (V1) and B.D.N2 (V2), were selected on the basis of their seed index value. The pod length and number of seeds per pod were significantly different for the two varieties. Dry weight, water content (WC), rate of water accumulation, rate of dry matter accumulation (DMA), and GA content in pod and seed were all larger in V1 than in V2. In both varieties, higher GA content was observed during cell elongation and DMA phases, respective to their varietal differences in growth traits. Relationships between... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cajanus cajan; Dry matter accumulation; Endogenous gibberellic acid; Seed development; Water content. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000100005 |
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| Reis,Renata Conduru Ribeiro; Dantas,Bárbara França; Castro,Renato Delmondez de; Antunes,Cimille Gabrielle Cardoso; Silva,Fabrício Francisco Santos da; Pelacani,Claudinéia Regina. |
| Gliricidia sepium is a drought-tolerant species, easily multiplied by seeds, and has been exploited by farmers as a source of forage in the semi-arid region of northeast Brazil. The objective of the present study was to evaluate the effect of seed storage on the mobilization of reserves during imbibition of "Gliricidia" seeds. Freshly-harvested seeds were packed in kraft paper bags and stored for three and six months in the laboratory under ambient conditions (25 º C ± 3 T and 75% ± 3 RH). Cotyledons were isolated from imbibed seeds and macerated for the extraction and quantification of total soluble sugars, reducing sugars, sucrose and starch, as well as of proteins, amino acids and for amylase activity. Storage under these conditions resulted in an... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Macromolecules; Longevity; Viability; Germination; Water content. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-31222011000300018 |
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| ROSTAMI,L.; SADEGHI,H.; HOSSEINI,S.. |
| ABSTRACT Caper (Capparis spinosa) is used as multipurpose and adaptable plant which provides a valuable opportunity to enhance greenery in harsh climatic areas. This plant like the others is affected by drought and sodium chloride stresses as the most common abiotic stresses worldwide. This study was carried out to determine the interaction between drought and different ratios of sodium and calcium chloride on caper. Droughts stress were two levels of 100 and 75% of field capacity and were applied based on the daily weighting method of pots. Salt treatments were four different ratios of calcium chloride: sodium chloride (1:0, 1:1, 1:3, 1:5]. Treatments started when the plants were sown in the pots. Results indicated that higher ratios of calcium chloride... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Salt stress; Chlorophyll index; Water content. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000200259 |
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| Pértile,Patricia; Reichert,José Miguel; Gubiani,Paulo Ivonir; Holthusen,Dörthe; Costa,André da. |
| ABSTRACT Rheological parameters have been used to study the interaction between particles and the structural strength of soils subjected to mechanical stresses, in which soil composition and water content most strongly affect soil resistance to deformation. Our objective was to evaluate the effect of water tension on rheological parameters of soils with different mineralogical, physical, and chemical composition. Surface and subsurface horizons of four Oxisols, two Ultisols, one Alfisol, and one Vertisol were physically and chemically characterized; their rheological parameters were obtained from amplitude sweep tests under oscillatory shear on disturbed soil samples that were saturated and subjected to water tension of 1, 3, 6, and 10 kPa. In these... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil mechanics; Rheometry; Cohesion; Water content; Capillary forces. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100411 |
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| Beutler,Amauri Nelson; Centurion,José Frederico; Silva,Alvaro Pires da. |
| The objective of this study was determine the resistance to penetration (PR), least limiting water range (LLWR) and critical bulk density (Db-crit) for soybean yield in a medium-textured oxisol (Haplustox). The treatments represented the soil compaction by passing a tractor over the site 0, 1, 2, 4, and 6 times, with 4 replications in a randomized experimental design. Samples were collected from 0.02-0.05, 0.07-0.10 and 0.15-0.18 m depths. Soybean (Glycine max cv. Embrapa 48) was sowed in December 2002. Plant height, number of pods, aerial dry matter, weight of 100 seeds, and the yield in 3.6 m² plots were recorded. Soybean yield started reduction at the PR of 0.85 MPa and Db of 1.48 Mg m-3. The LLWR was limited in highest part by water content at field... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Water content; Resistance to penetration; Bulk density. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000800002 |
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| Registros recuperados: 25 | |
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