scholarly journals EVAPOTRANSPIRAÇÃO DE REFERÊNCIA EM FUNÇÃO DOS EXTREMOS DA TEMPERATURA DO AR NO ESTADO DO RIO DE JANEIRO

Irriga ◽  
2018 ◽  
Vol 21 (3) ◽  
pp. 449 ◽  
Author(s):  
Anderson Amorim Rocha Santos ◽  
Gustavo Bastos Lyra ◽  
Guilherme Bastos Lyra ◽  
Evaldo Paiva Lima ◽  
José Leonaldo De Souza ◽  
...  
Keyword(s):  
Air Temperature ◽  
Rio De Janeiro ◽  
Reference Evapotranspiration ◽  
Global Radiation ◽  
The State ◽  
Southeastern Brazil ◽  
Temperature Extremes ◽  
Empirical Methods ◽  
And Performance ◽  
E Mail

EVAPOTRANSPIRAÇÃO DE REFERÊNCIA EM FUNÇÃO DOS EXTREMOS DA TEMPERATURA DO AR NO ESTADO DO RIO DE JANEIRO  ANDERSON AMORIM ROCHA SANTOS1; GUSTAVO BASTOS LYRA2; GUILHERME BASTOS LYRA3; EVALDO PAIVA LIMA4; JOSÉ LEONALDO DE SOUZA5 E RAFAEL COLL DELGADO2 1 Engenheiro Agrônomo, Mestre em Engenharia de Biossistemas, Escola de Engenharia, Universidade Federal Fluminense – UFF, Campus da Praia Vermelha, 24210-240, Niterói, Rio de Janeiro, Brasil, e-mail: [email protected] Meteorologistas, Professores Doutores do Departamento de Ciências Ambientais, Instituto de Florestas, Universidade Federal Rural do Rio de Janeiro – UFRRJ, Campus UFRRJ, 23897-000, Seropédica, Rio de Janeiro, Brasil, e-mail: [email protected]; [email protected] Engenheiro Agrônomo, Professor Doutor do Centro de Ciências Agrárias, Universidade Federal de Alagoas – UFAL, BR-104, 57100-000, Rio Largo, Alagoas, Brasil, e-mail:[email protected]  4 Meteorologista, Pesquisador do Centro Nacional de Pesquisa de Solos, Empresa Brasileira de Pesquisa Agropecuária – EMBRAPA, Rua Jardim Botânico 1024, 22460-000, Rio de Janeiro, Rio de Janeiro, Brasil, e-mail: [email protected] Meteorologista, Professor Doutor do Centro de Ciências Agrárias, Universidade Federal de Alagoas – UFAL, BR-104, 57100-000, Rio Largo, Alagoas, Brasil, e-mail: [email protected]  1 RESUMO A aplicação do método de Penman-Monteith FAO56 (PM-FAO56) para estimativa da evapotranspiração de referência (ETo) requer observações de diversos elementos meteorológicos. A maior parte das estações meteorológicas não realiza medidas de todos os elementos, o que restringe a aplicação do PM-FAO56. O objetivo foi avaliar o desempenho dos métodos empíricos de Thornthwaite, Camargo, Hargreaves-Samani, Jensen-Haise e Makkink na estimativa de ETo em função dos extremos de temperatura do ar no estado do Rio de Janeiro (RJ). Foram utilizadas séries meteorológicas entre oito e 34 anos de 10 estações convencionais pertencentes ao Instituto Nacional de Meteorologia localizadas no RJ. As estimativas decendiais e mensais de ETo pelos métodos empíricos foram comparadas com ETo determinada por PM-FAO56 (padrão) para se avaliar a exatidão (Erro Padrão de Estimativa - EPE e Índice de Willmott - d), precisão (coeficiente de determinação - R²) e o desempenho (índice c de Camargo e Sentelhas) dos métodos. Independente da escala de tempo avaliada, o método de Makkink mostrou estimativas com maior exatidão (d > 0,82 e EPE < 0,68 mm d-1), precisão (R² > 0,88) e desempenho (índice c > 0,85) nas estações caracterizadas com clima úmido, subúmido, subúmido seco com pequeno excedente hídrico. Nas demais estações, clima subúmido seco com excedente nulo e semiárido, o método de Hargreaves-Samani teve melhor desempenho (índice c > 0,85). Os métodos de Thornthwaite e Camargo apresentaram estimativas com exatidão (d > 0,90 e EPE < 0,72 mm d-1) e desempenho (índice c > 0,76) entre os melhores e podem ser usados para estimativa de ETo no RJ. As menores exatidões (d < 0,73 e EPE > 1,38 mm d-1) e desempenhos (0,51 < índice c < 0,75) das estimativas foram proporcionadas por Jensen-Haise para todas as estações e escalas de tempo, não sendo recomendado sua aplicação no estado do RJ. Os métodos de Hargreaves-Samani, Jensen-Haise e Makkink devem ser ajustados às condições climáticas do RJ. Palavras-Chave: Penman-Monteith, radiação solar global, amplitude térmica   SANTOS, A. A. R.; LYRA, G.B.; LYRA, G.B.; LIMA, E. P.; SOUZA, J. L.; DELGADO, R. C.ESTIMATES OF THE REFERENCE EVAPOTRANSPIRATION USING AIR TEMPERATURE EXTREMES IN THE STATE OF THE RIO DE JANEIRO, SOUTHEASTERN BRAZIL 2 ABSTRACT The use of the Penman-Monteith FAO56 method (PM-FAO 56) to estimate reference evapotranspiration (ETo) requires several weather elements. However, most weather stations don’t measure all the elements, which restricts the application of PM-FAO 56. The aim of this article was to evaluate the performance of five empirical methods (Thornthwaite, Camargo, Hargreaves-Samani, Jensen-Haise and Makkink) to estimate ETo using air temperature extremes in the state of the Rio de Janeiro (RJ). Times series of weather elements between eight and 34 years from 10 conventional stations of the Brazilian National Institute of Meteorology located in RJ were used. The ten-day and monthly estimates of ETo by empirical methods were compared to ETo determined by PM-FAO 56 (default) to evaluate the accuracy (Standard Error of the Estimate - SEE and Willmott index - d), precision (coefficient of determination - R²) and performance (Camargo and Sentelhas – c Index) of the methods. Independent of the time scale, the Makkink method showed the highest accuracies (d > 0.82 and SEE < 0.68 mm d-1), precision (R² > 0.88) and performance (c Index > 0.85) on the stations, characterized with humid, sub-humid, dry sub-humid with small water surplus. For the other stations, semiarid and dry sub-humid climate with no surplus, the Hargreaves-Samani method had the best performance (c Index > 0.85). The Thornthwaite and Camargo methods presented accuracy (d > 0.90 and SEE < 0.72 mm d-1) and performance (Index c > 0.76) between the top and can be used to estimate ETo in RJ. For all stations and time scales, the worst accuracies (d < 0.73 and SEE > 1.38 mm d-1) and performance (0.51 < Index c < 0.75) estimates were provided by the Jensen-Haise method, so it is not recommended its application in RJ state. The Hargreaves-Samani, Jensen-Haise and Makkink methods should be fitted to the climatic conditions of RJ. Keywords: Penman-Monteith, solar global radiation, temperature amplitude

scholarly journals Assessment of monthly global solar irradiation estimates using air temperature in different climates of the state of Rio de Janeiro, Southeastern Brazil

2019 ◽  
Vol 1 (9) ◽  
Author(s):  
Allana Oliveira Lima ◽  
Gustavo Bastos Lyra ◽  
José Leonaldo de Souza ◽  
Guilherme Bastos Lyra ◽  
José Francisco de Oliveira-Júnior ◽  
...  
Keyword(s):  
Air Temperature ◽  
Rio De Janeiro ◽  
The State ◽  
Solar Irradiation ◽  
Southeastern Brazil ◽  
Global Solar Irradiation ◽  
Different Climates

scholarly journals Assessment of empirical methods for estimation of reference evapotranspiration in the Brazilian Savannah

2019 ◽  
pp. 1094-1104
Author(s):  
Lucas da Costa Santos ◽  
Guilherme Henrique Terra Cruz ◽  
Frank Freire Capuchinho ◽  
Jeffersom Vieira José ◽  
Elton Fialho dos Reis
Keyword(s):  
Air Temperature ◽  
Standard Method ◽  
Reference Evapotranspiration ◽  
Meteorological Data ◽  
Reference Method ◽  
The State ◽  
Coefficient Of Determination ◽  
Mean Bias Error ◽  
Bias Error ◽  
Empirical Methods

Evapotranspiration can be sufficiently estimated when meteorological data are available to implement robust models such as Penman-Monteith (PM). However, due to data scarcity, alternative approaches are necessary. In this context, this study aims to compare the reference evapotranspiration (ETo) obtained from the PM standard method with eight empirical equations to identify the simplest method that can be alternative to the reference method (Penman Monteith method) for ten places in state of Goiás (located in west-central Brazil, Brazilian Savanna). To estimate the ETo, air temperature and relative humidity air, wind speed, sunshine and solar radiation data, which were obtained from the data platform National Institute of Meteorology and the Meteorological and Hydrological System of the State of Goiás, were used. For comparison of empirical methods with PM standard method, we used the following statistical indicators: slope and intercept coefficients (β0 and β1) of regressions equations, the coefficient of determination (r²), Pearson's correlation (r), mean bias error (MBE), root mean square error (RMSE) concordance index refined (dr) and performance index (Pi). Our results indicated that the Turc method is the best option for the state of Goiás when meteorological data are not suffeciently available to use the standard PM method. On the other hand, the method of Romanenko did not present acceptable performance in nine of the ten studied localities. Therefore, its use is advised only in the municipality of the Itumbiara. Among evaluated methods the Hargreaves-Samani method is the best alternative, when there is only air temperature data.

Suitable environmental areas for commercial timber in the state of Rio de Janeiro, Southeastern Brazil

2021 ◽  
Author(s):  
Marinna Lopes F. Gomes ◽  
Dayanne de Oliveira Prado ◽  
Tamires Partélli Correia ◽  
Gustavo Bastos Lyra ◽  
Emanuel José Gomes de Araújo ◽  
...  
Keyword(s):  
Rio De Janeiro ◽  
The State ◽  
Southeastern Brazil

scholarly journals Diet and helminths of Enyalius brasiliensis (Lacertilia, Iguania, Leiosauridae) in an Atlantic Rainforest remnant in southeastern Brazil

2014 ◽  
Vol 74 (1) ◽  
pp. 199-204 ◽  
Author(s):  
TA Dorigo ◽  
T Maia-Carneiro ◽  
M Almeida-Gomes ◽  
CC Siqueira ◽  
D Vrcibradic ◽  
...  
Keyword(s):  
Rio De Janeiro ◽  
The State ◽  
Atlantic Rainforest ◽  
Southeastern Brazil ◽  
Helminth Parasites

Our study aimed to add information about the diet and endoparasites of Enyalius brasiliensis from an Atlantic Rainforest remnant in the state of Rio de Janeiro, southeastern Brazil. Regarding diet, E. brasiliensis consumed arthropods, with caterpillars and beetles being the most important preys. Regarding helminth parasites, overall prevalence was low (9.5%), with 238 nematodes of the genus Physaloptera found in the stomach of one specimen and one nematode of the genus Rhabdias inside the lung of another. Our results corroborate the observations of previous studies that indicate that lizards of the genus Enyalius tend to feed mainly on relatively large-bodied arthropods and to harbour depauperate endoparasite fauna.

scholarly journals Reference evapotranspiration for Londrina, Paraná, Brazil: performance of different estimation methods

2017 ◽  
Vol 38 (4Supl1) ◽  
pp. 2363
Author(s):  
Rodrigo Dlugosz da Silva ◽  
Marcelo Augusto de Aguiar e Silva ◽  
Marcelo Giovanetti Canteri ◽  
Juliandra Rodrigues Rosisca ◽  
Nilson Aparecido Vieira Junior
Keyword(s):  
Reference Evapotranspiration ◽  
Meteorological Data ◽  
Global Radiation ◽  
Alternative Methods ◽  
Estimation Methods ◽  
Performance Indices ◽  
Excellent Performance ◽  
Study Region ◽  
Temperature Radiation ◽  
And Performance

Aiming at assessing the performance of alternative methods to Penman-Monteith FAO56 for estimating the reference evapotranspiration (ETo) for Londrina, Paraná, Brazil, the methods temperature radiation, Hicks-Hess, Hargreaves-Samani (1982), Turc, Priestley-Taylor, Tanner-Pelton, Jensen-Haise, Makkink, modified Hargreaves, Stephens-Stewart, Abtew, global radiation, Ivanov, Lungeon, Hargreaves-Samani (1985), Benavides-Lopez, original Penman, Linacre, Blaney-Morin, Romanenko, Hargreaves (1974), McCloud, Camargo, Hamon, Kharrufa, McGuiness-Bordne, and Blaney-Criddle were compared to that standard method recommended by FAO. The estimations were correlated by linear regression and assessed by using the Person’s correlation coefficient (r), concordance index (d), and performance index (c) using a set of meteorological data of approximately 40 years. The methods modified Hargreaves, Stephens-Stewart, Abtew, global radiation, Ivanov, Lungeon, Hargreaves-Samani (1985), Benavides-Lopez, original Penman, and Linacre should be avoided, as they did not present excellent results. The methods McCloud, Camargo, Hamon, Kharrufa, McGuinness-Bordne, Blaney-Criddle, Hargreaves (1974), Romanenko, and Blaney-Morin were classified as very bad, not being recommended. In contrast, the methods temperature radiation, Hicks-Hess, Hargreaves-Samani (1982), Turc, Priestley-Taylor, Tenner-Pelton, Jensen-Haise, and Makkink presented excellent performance indices and can be applied in the study region.

scholarly journals Reference evapotranspiration for Londrina, Paraná, Brazil: performance of different estimation methods

2017 ◽  
Vol 38 (4Supl1) ◽  
pp. 2363
Author(s):  
Rodrigo Dlugosz da Silva ◽  
Marcelo Augusto de Aguiar e Silva ◽  
Marcelo Giovanetti Canteri ◽  
Juliandra Rodrigues Rosisca ◽  
Nilson Aparecido Vieira Junior
Keyword(s):  
Reference Evapotranspiration ◽  
Meteorological Data ◽  
Global Radiation ◽  
Alternative Methods ◽  
Estimation Methods ◽  
Performance Indices ◽  
Excellent Performance ◽  
Study Region ◽  
Temperature Radiation ◽  
And Performance

Aiming at assessing the performance of alternative methods to Penman-Monteith FAO56 for estimating the reference evapotranspiration (ETo) for Londrina, Paraná, Brazil, the methods temperature radiation, Hicks-Hess, Hargreaves-Samani (1982), Turc, Priestley-Taylor, Tanner-Pelton, Jensen-Haise, Makkink, modified Hargreaves, Stephens-Stewart, Abtew, global radiation, Ivanov, Lungeon, Hargreaves-Samani (1985), Benavides-Lopez, original Penman, Linacre, Blaney-Morin, Romanenko, Hargreaves (1974), McCloud, Camargo, Hamon, Kharrufa, McGuiness-Bordne, and Blaney-Criddle were compared to that standard method recommended by FAO. The estimations were correlated by linear regression and assessed by using the Person’s correlation coefficient (r), concordance index (d), and performance index (c) using a set of meteorological data of approximately 40 years. The methods modified Hargreaves, Stephens-Stewart, Abtew, global radiation, Ivanov, Lungeon, Hargreaves-Samani (1985), Benavides-Lopez, original Penman, and Linacre should be avoided, as they did not present excellent results. The methods McCloud, Camargo, Hamon, Kharrufa, McGuinness-Bordne, Blaney-Criddle, Hargreaves (1974), Romanenko, and Blaney-Morin were classified as very bad, not being recommended. In contrast, the methods temperature radiation, Hicks-Hess, Hargreaves-Samani (1982), Turc, Priestley-Taylor, Tenner-Pelton, Jensen-Haise, and Makkink presented excellent performance indices and can be applied in the study region.

scholarly journals Amphibians of the Parque Nacional da Restinga de Jurubatiba, a sandy coastal environment in southeastern Brazil

2019 ◽  
Vol 19 (2) ◽  
Author(s):  
Luiz Fernando Carmo ◽  
Ingrid Ribeiro Miguel ◽  
Pedro H. Pinna ◽  
Daniel Silva Fernandes ◽  
Manoela Woitovicz-Cardoso
Keyword(s):  
Rio De Janeiro ◽  
Coastal Environment ◽  
The State ◽  
Southeastern Brazil ◽  
Detailed Knowledge ◽  
Coastal Environments ◽  
Accurate Knowledge ◽  
First Time ◽  
Long Term Studies

Abstract: We provide an inventory checklist of the amphibians from Parque Nacional da Restinga de Jurubatiba (PNRJ), a sandy coastal environment in southeastern Brazil. As a result of three years of surveys, from August 2013 to June 2016, a total of 36 amphibians species were recorded - one Gymnophiona (Typhlonectidae) and 35 species of five anuran families: Bufonidae (2 species), Craugastoridae (1), Hylidae (21), Leptodactylidae (8), and Microhylidae (3). One specie is reported for the first time for the restinga ecosystem (Chthonerpeton braestrupi) and 24 species were recorded for the first time to the PNRJ. This result reinforces the importance of long-term studies for accurate knowledge of the biodiversity. Considering that the biodiversity of the fragments of the sandy coastal environments in the state of Rio de Janeiro is poorly known, the present study provided a more detailed knowledge about different aspects of the biodiversity in the PNRJ, contributing to the preservation of this threatened ecosystem.

scholarly journals Precipitação e temperatura do ar simuladas pelo modelo ETA/CPTEC - HADCM3 para o estado do Rio de Janeiro

2020 ◽  
Vol 13 (5) ◽  
pp. 2037
Author(s):  
FERNANDA DA SILVA PINHEIRO ◽  
EDNALDO OLIVEIRA DOS SANTOS ◽  
GUSTAVO BASTOS LYRA ◽  
GILBERTO FERNANDO FISCH ◽  
HENDERSON SILVA WANDERLEY
Keyword(s):  
Air Temperature ◽  
Performance Index ◽  
Rio De Janeiro ◽  
Climate Model ◽  
Coefficient Of Determination ◽  
Grid Points ◽  
And Performance ◽  
Hadcm3 Model ◽  
Climatic Series ◽  
Janeiro State

O trabalho avaliou simulações de precipitação e temperatura do ar do modelo Eta-CPTEC para o Rio de Janeiro de 1961-1990. Nas simulações, considerou-se resolução espacial de 40 km para uma grade que compreendeu a América do Sul, com o Eta-CPTEC inicializado com o modelo HadCM3. As séries climáticas observadas das variáveis estudadas foram obtidas de estações meteorológicas do INMET distribuídas no estado do Rio de Janeiro. Estas séries foram comparadas com aquelas extraídas dos pontos de grade do modelo mais próximas das estações. Nas avaliações considerou-se o coeficiente de determinação (r²) da regressão linear simples entre dados observados e simulados; o índice de concordância de Willmott (d), o índice de desempenho (c) e a Raiz do Quadrado Médio do Erro (RQME) e seus componentes sistemático (RQMEs) e não sistemático (RQMEu). As simulações de precipitação apresentaram r² menores do que 0,32, o que indicou baixa precisão, enquanto que a exatidão (d) foi superior a 0,50, com exceção de Bangu (0,16). A baixa precisão comprometeu o desempenho (c) das simulações, com 0,07 <= c <= 0,42, classificados entre “péssimo” e “ruim”. A RQME variou entre 76,2 e 133,4 mm, que correspondeu a um erro de 78,1 e 115,5% em relação à precipitação média. As simulações de temperatura do ar mostraram desempenho melhor do que a precipitação, com maior precisão (0,39 <= r² <= 0,53), exatidão (0,50 <= d <= 0,79) e desempenho (0,36 <= c <= 0,52). A RQME ficou entre 1,9 e 5,7oC, representando 9 e 26% da média da temperatura do ar. Na maior parte das estações, o RQMEs se sobressaiu em relação ao RQMEu, indicando que as simulações podem ser corrigidas usando técnicas estatísticas. Precipitation and air temperature numerical simulations through ETA/CPTEC - HADCM3 model in Rio de Janeiro A B S T R A C TThe present study evaluated the precipitation and air temperature simulations of the Eta-CPTEC model for Rio de Janeiro state in 1961-1990. In the simulations, a spatial resolution of 40 km was considered for a grid that comprised South America, with Eta-CPTEC initialized with HadCM3 model. The observed climatic series of the studied variables were obtained from INMET meteorological stations distributed at Rio de Janeiro state. These series were compared with those extracted from the grid points of the model near to the stations. The coefficient of determination (r²) of the simple linear regression between observed and simulated, Willmott's index of agreement (d), performance index (c), Root Mean Square Error (RQME) and their systematic (RQMEs) and unsystematic (RQMEu) components were considered in the evaluations. The precipitation simulations showed r² less than 0.32, which indicated low precision, while the accuracy (Willmott's d) was greater than 0.50, except for Bangu station. The low precision compromised the performance (index “c”) of the simulations, with 0,07 £ c £ 0,42, classified as "terrible" and "bad". The RQME varied between 76.2 and 133.4 mm, which corresponded error of 78.1 and 115.5% in relation to mean precipitation. The simulations of air temperature showed better performance than precipitation, with greater precision (0.39 £ r² £  0.53), accuracy (0.50 £ d £ 0.79) and performance (0.36 £ c £ 0.52). The RQME was between 1.9 and 5.7oC, which represented respectively 9 and 26% for average of air temperature. In most stations, RQMEs were higher than the RQMEu, which indicated that simulators can be fitted using statistical techniques.Keywords: climate model, meteorological dataset, downscaling

scholarly journals EVAPOTRANSPIRAÇÃO E COEFICIENTES DA CULTURA DO REPOLHO EM SISTEMA ORGÂNICO

Irriga ◽  
2019 ◽  
Vol 24 (1) ◽  
pp. 98-108
Author(s):  
Mário Sérgio Paiva de Araújo ◽  
Elias Fernandes de Sousa ◽  
Daniel Fonseca de Carvalho ◽  
Vinicius Rocha Pereira
Keyword(s):  
Brassica Oleracea ◽  
Water Use ◽  
Rio De Janeiro ◽  
Reference Evapotranspiration ◽  
Crop Evapotranspiration ◽  
Organic System ◽  
Use Efficiency ◽  
Crop Coefficients ◽  
E Mail ◽  
Weighing Lysimeter

EVAPOTRANSPIRAÇÃO E COEFICIENTES DA CULTURA DO REPOLHO EM SISTEMA ORGÂNICO*     MÁRIO SERGIO PAIVA DE ARAUJO1; ELIAS FERNANDES DE SOUSA2; DANIEL FONSECA DE CARVALHO3 E VINICIUS ROCHA PEREIRA4   1Centro de Ciências e Tecnologias Agropecuárias, Laboratório de Engenharia Agrícola, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Av. Alberto Lamego, 2000, Parque Califórnia, CEP: 28013-602 - Campos dos Goytacazes, RJ – Brasil. E-mail: [email protected] 2Centro de Ciências e Tecnologias Agropecuárias, Laboratório de Engenharia Agrícola, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Av. Alberto Lamego, 2000, Parque Califórnia, CEP: 28013-602 - Campos dos Goytacazes, RJ – Brasil. E-mail [email protected] 3 Instituto de Tecnologia, Departamento de Engenharia, Universidade Federal Rural do Rio de Janeiro, Rodovia BR-465, km 7, CEP: 23897000 - Seropédica, RJ – Brasil. E-mail: [email protected] 4Graduando em Engenharia Agrícola e Ambiental, Universidade Federal Rural do Rio de Janeiro, Rodovia BR-465, km 7, CEP: 23897000 - Seropédica, RJ – Brasil. E-mail: [email protected] *Extraído da dissertação de Mestrado do primeiro autor, defendida pelo Programa de Pós-Graduação em Engenharia Agrícola e Ambiental da Universidade Federal Rural do Rio de Janeiro     1        Resumo    Objetivou-se estimar a evapotranspiração da cultura (ETc) e os coeficientes de cultivo (Kc) para as fases de desenvolvimento do repolho Fuyutoyo, utilizando lisímetro de pesagem. O experimento foi realizado de 17/07 a 26/10/2015, em área cultivada com repolho Fuyutoyo sobre a palhada de milho, no município de Seropédica-RJ. Utilizou o método Penman-Monteith FAO-56 para estimar a evapotranspiração de referência (ETo), e os valores de Kc foram determinados pela razão entre ETc, determinada por lisimetria de pesagem, e ETo. A ETc total do ciclo do repolho foi 411,55 mm e os valores de Kc para o repolho foram: 1,02 (I); 1,03 (II);1,05 (III) e 1,01 (IV), e se diferenciaram dos valores apresentados pela FAO, para cultivo convencional. A produtividade do repolho cultivado em sistema orgânico foi de 34,76 Mg ha-1, com uma eficiência do uso da água de 8,45 kg m-3.   Palavras-chave: brassica oleracea, lisímetro de pesagem, cultivo sobre palhada de milho     ARAÚJO, M. S. P; SOUSA, E. F.; CARVALHO, D. F; PEREIRA, V. R. EVAPOTRANSPIRATION AND CROP COEFFICIENTS OF CABBAGE IN AN ORGANIC SYSTEM     2        AbstraCt   The study was carried out in order to estimate crop evapotranspiration (ETc) and crop coefficients (Kc) for the stages of “Fuyutoyo” cabbage, using weighing lysimeter. The field trial occurred in 2015, from July 17 to October 26, in areas cultivated with “Fuyutoyo” cabbage planted on a straw of corn, in the municipality of Seropédica, RJ, Brazil. The FAO-56 Penman-Monteith method was used to estimate reference evapotranspiration (ETo) and Kc values ​​were determined by the ratio of ETc, determined by weighing lysimetry, and ETo. The total ETc of the cabbage cycle was 411.55 mm and Kc values obtained were: 1.02 (I); 1.03 (II); 1.05 (III) e 1.01 (IV), which were different from the values presented by FAO. The productivity of cabbage was 34.76 Mg ha-1, with water use efficiency of 8.45 kg m-3.   Keywords: brassica oleracea, weighing lysimeter, cultivation on straw of corn

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