|
|
|
| Registros recuperados: 19 | |
|
| |
|
|
| Bilibio, Carolina; Hensel, Oliver. |
| Evapotranspiration covers are key to minimizing water percolation in waste systems. On potash tailings piles, evapotranspiration covers are important because they may decrease the leaching of brines generated from precipitation erosion. Considering this, the water deficit of four different potash tailings piles covering materials were evaluated using the CropWat model. This study was based on a lysimeter experiment carried out in Heringen, Germany. The experiment consisted of 4 different technogenic substrates made of municipal incineration wastes and coal combustion residues covered with a mixture of perennial grasses. By using the FAO CropWat model, the effective precipitation, crop evapotranspiration, actual evapotranspiration and the water deficit were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Effective precipitation; Drought; Perennial ryegrass; Lysimeters; Crop coefficient. |
| Ano: 2021 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6327 |
| |
|
|
| Andrade,Irineu P. de S.; Carvalho,Daniel F. de; Almeida,Wilk S. de; Silva,Jonathas B. Gonçalves; Silva,Leonardo D. B. da. |
| This work aimed to study the effect of drip irrigation management on growth and yield of the 'Roxo de Valinhos' fig tree (Ficus carica L.), at three years old, and to determine crop coefficients (Kc) and its water requirement (ETc) under Baixada Fluminense climate and soil conditions, state of Rio de Janeiro, Brazil. The study was carried out in the experimental area of SIPA (Sistema Integrado de Produção Agroecológica) in Seropédica, Rio de Janeiro State, from July 2011 to May 2012. The experimental area was divided in two blocks, named B1 (sandy clay loam texture) and B2 (loamy sand texture). In each block, irrigation frequencies (IF) of two (T1) and four days (T2) were evaluated, as well as the irrigation absence (T3). Irrigation management and water... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Crop coefficient; Ficus carica L.; TDR; Irrigation frequency; Water balance. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000100003 |
| |
|
| |
|
|
| Rolim,João; Navarro,Ana; Vilar,Pedro; Saraiva,Cátia; Catalao,Joao. |
| ABSTRACT Accurate crop data are essential for reliable irrigation water requirements (IWR) calculations, which can be acquired during the crop growth season for a given region using earth observation (EO) satellite time series. In addition, a relationship between crop coefficients and the NDVI can be established to allow for crop evapotranspiration estimation. The main objective of the present work was to develop a methodology, and its implementation in an application software, to extract crop parameters from EO image time series for a set of parcels of different types of crops, to be used as input data for a soil water balance model to compute IWR. The methodology was tested at two distinct test sites, the Vila Franca de Xira (site I) and Vila Velha de... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Remote sensing; Irrigation; Software; NDVI; Crop phenology; Crop coefficient. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000300380 |
| |
|
| |
|
| |
|
|
| RODRIGUES, L. N.; AZEVEDO, J. A. de; SOCCOL, O. J.; SILVA, E. M. da. |
| ABSTRACT: Among the several methods used to manage irrigation, the ones based on the calculation of crop water consumption or evapotranspiration are the most common. From those, the one presented by Doorenbos e Pruitt (1977) is the most used. Based on this method, the crop evapotranspiration is calculated multiplying a crop reference evapotranspiration by a crop coefficient. Applying this methodology in some situations is not convenient, for instance, in the estimative of crop water use efficiency. Besides of this, a good estimative of crop coefficient is difficult and should be done for each region, once is site specific. Options to this method are the models that calculate the evaporation and transpiration separately. Among those, the one presented by... |
| Tipo: Folhetos |
Palavras-chave: Coeficiente de cultura; Evapotranspiração; Manejo de Água; Irrigação; Crop coefficient; Evapotranspiration; Irrigation; Water management. |
| Ano: 2005 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/569838 |
| |
|
| |
|
|
| A Embrapa Mandioca e Fruticultura, situada em Cruz das Almas, Bahia, em parceria com a Embrapa Semiárido, localizada em Petrolina, Pernambuco, tem o prazer de entregar aos produtores de mandioca do clima Semiárido, um sistema de produção para a cultura. Essa zona climática ocupa 18% da área do País, sendo a mandioca uma das culturas relevantes no mesmo. O Sistema de Produção de Mandioca no Semiárido traz todas as informações técnicas necessárias ao cultivo da mandioca, enfocando as fases de estabelecimento da cultura, tratos culturais, controle de pragas e doenças, manejo da colheita e da pós-colheita e uso da mandioca na alimentação humana. Espera-se que a publicação aqui disponibilizada possa contribuir significativamente como instrumento para a melhoria... |
| Tipo: Livros |
Palavras-chave: Importância econômica; Coeficiente técnico; Processamento da mandioca; Região Semiárida; Mandioca; Sistema de Produção; Manejo do Solo; Adubação; Praga; Doença; Pós-Colheita; Mercado; Comercialização; Sistema de Cultivo; Cassava; Postharvest systems; Product system; Cultivars; Crop coefficient; Crop management. |
| Ano: 2020 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1131110 |
| |
|
| |
|
|
| GUERRA, A. F.; RODRIGUES, G. C.; ROCHA, O. C.; EVANGELISTA, W.. |
| RESUMO: Este trabalho objetivou determinar a necessidade hídrica e os coeficientes de cultura em feijão, trigo, milho e arroz irrigados por aspersão do tipo pivô-central, visando ao manejo da água com tanque classe A. O feijão e o trigo foram cultivados na época da seca com plena irrigação enquanto o milho e o arroz, no período das chuvas, com suplementação hídrica. A evapotranspiração real foi medida por lisímetro de pesagens, com 3 m de comprimemento, 2 m de largura e 1,2 m de altura, instalado na parte central da área irrigada. Os dados de evaporação do tanque Classe A foram medidos em uma estação meteorológica localizada a 150 m da área experimental. Os resultados da evapotranspiração e dos coeficientes de cultura foram 30% superiores aos sugeridos na... |
| Tipo: Folhetos |
Palavras-chave: Cultura anual; Coeficiente de cultura; Grain; Cerrado; Evapotranspiração; Grão; Irrigação por Aspersão; Irrigação; Manejo de Água; Annuals; Crop coefficient; Evapotranspiration; Irrigation; Sprinkler irrigation; Water management. |
| Ano: 2003 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/568970 |
| |
|
|
| Fenner,William; Dallacort,Rivanildo; Faria Junior,Cleonir A.; Freitas,Paulo S. L. de; Queiroz,Tadeu M. de; Santi,Adalberto. |
| ABSTRACT The evapotranspiration process is critical to studies on the water balance and water demand of crops and can be determined by several methods. A widely-used method, despite its high installation costs, is weighing lysimeters, which consists of a box over a balance connected to a load cell that monitors variations in the soil-water-plant-atmosphere system. The aim of this study was to develop and calibrate six weighing lysimeters (with dimensions of 1.5 x 1.5 x 1.2 m each) by high precision load cells, testing their ability to measure water mass changes in field conditions and cultivated with common bean (Phaseolus vulgaris L.), in the city of Tangará da Serra, in the state of Mato Grosso, Brazil. All lysimeters showed coefficients of determination... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Crop coefficient; Water balance; Lysimetry; Water soil engineering. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000400297 |
| |
|
| |
|
|
| Carvalho,Daniel F. de; Ribeiro,Eduardo C.; Gomes,Daniela P.. |
| ABSTRACT The objectives of this study were to obtain the onion crop coefficients and evaluate the influence of different irrigation depths (0, 22, 45, 75 and 100% of crop evapotranspiration) on marketable yield and quality of onion bulbs cultivated with and without mulch of elephant grass. The experiment was carried out in Seropédica, RJ, Brazil, from May to September 2012, in a Red Yellow Argisol. The experimental design was in randomized blocks in split plots, with 10 treatments and seven replicates. Irrigation management was performed through soil water balance using the Time Domain Reflectometry technique, with probes installed horizontally at 7.5 and 22.5 cm depths. The use of mulch allowed the application of smaller irrigation depths, leading to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Crop coefficient; Water requirement; Allium cepa L.; Vegetable grass residues. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000200107 |
| |
|
|
| Klar,A.E.; Fernandes,M.A.. |
| A study of water use by bean winter crop (Phaseolus vulgaris, L., cv. Carioca) was carried out in a Red Yellow Latosol, clay texture. A furrow irrigation system maintained soil water potentials higher than -40 KPa. Two broadcast nitrogen treatments (0 and 30 kg N/ha) were applied 25 days after planting. The major objectives were to study the nitrogen and evapotranspiration interaction and measure the crop coefficients (Kc). The maximum average evapotranspiration (ETm) was 1.71 mm/day, or 157.16 mm over 92 days of observations; the ETm values for the vegetative (1), flowering (2) and pod formation (3) phases were 1.48, 2.35, and 1.50 mm/day, respectively, for the 30 kg/ha nitrogen treatment, and 1.48, 1.88 and 1.45 mm/day for the no nitrogen treatment. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Evapotranspiration; Crop coefficient; Irrigation. |
| Ano: 1997 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000200004 |
| |
|
| |
|
| |
|
| |
| Registros recuperados: 19 | |
|
|
|
