Determination of evapotranspiration and basal crop coefficient of alfalfa with a weighing lysimeter

2006 ◽  
Vol 81 (3) ◽  
pp. 358-370 ◽  
Author(s):  
Bogachan Benli ◽  
Suleyman Kodal ◽  
Adem Ilbeyi ◽  
Haluk Ustun
Keyword(s):  
Crop Coefficient ◽  
Weighing Lysimeter

scholarly journals Growth-stage-specific crop coefficient and consumptive use of Capsicum chinense using hydraulic weighing lysimeter

2018 ◽  
Vol 203 ◽  
pp. 179-185 ◽  
Author(s):  
O.D. Raphael ◽  
K. Ogedengbe ◽  
J.T. Fasinmirin ◽  
D. Okunade ◽  
I. Akande ◽  
...  
Keyword(s):  
Growth Stage ◽  
Crop Coefficient ◽  
Capsicum Chinense ◽  
Consumptive Use ◽  
Weighing Lysimeter

scholarly journals Determination of Crop Co-efficient Values of Soybean (Glycine max [L.] Merrill) by Lysimeter Study

2017 ◽  
Vol 14 (2) ◽  
pp. 14-23
Author(s):  
A J Mila ◽  
A R Akanda ◽  
K K Sark
Keyword(s):  
Climatic Condition ◽  
Agricultural Research ◽  
Local Level ◽  
Crop Coefficient ◽  
Regional Level ◽  
Crop Evapotranspiration ◽  
Agricultural Research Institute ◽  
Initial Development ◽  
Crop Variety

Local level calibration of crop coefficient (Kc) values is critical for regional level planning and allocation of water resources for irrigation. In this regard, an experiment was conducted at the Irrigation and Water Management Division of Bangladesh Agricultural Research Institute (BARI), Gazipur, in order to estimate crop coefficient values of soybean under the local climatic condition. An improved crop variety- BARI Soybean-6 was used in this experiment. The crop was grown under four irrigation treatments, allowing irrigation at an interval of 10, 15, 20 and 25 days. The treatments were so designed that drainage was allowed between the consecutive irrigations. Irrigation at 15 days interval produced the highest seed yield of 1.26 t/ha and was considered to be suitable for estimating seasonal crop evapotranspiration (ETc) and Kc values. The seasonal highest cumulative ETc was 308.43 mm under this treatment. The Kc values of soybean at initial, development, mid-season and late season stages were found as 0.67, 1.46, 1.59 and 0.62, respectively.The Agriculturists 2016; 14(2) 14-23

Determination of a crop coefficient for evapotranspiration in a sparse sorghum field

2006 ◽  
Vol 55 (2) ◽  
pp. 165-175 ◽  
Author(s):  
Tomomichi Kato ◽  
Makio Kamichika
Keyword(s):  
Crop Coefficient

scholarly journals DESEMPENHO DE UM LISÍMETRO DE PESAGEM HIDRÁULICA COM DIFERENTES SISTEMAS DE LEITURA

Irriga ◽  
2018 ◽  
Vol 1 (01) ◽  
pp. 232 ◽  
Author(s):  
Antonio Henrique Cardoso do Nascimento ◽  
Suzana Maria Gico Lima Montenegro ◽  
Joao Audifax Cézar de Albuquerque Filho ◽  
Ênio Farias de França e Silva ◽  
NADIELAN DA SILVA LIMA
Keyword(s):  
Measurement Errors ◽  
Reference Method ◽  
Automated System ◽  
Coefficient Of Determination ◽  
Hydraulic Systems ◽  
Para Determinar ◽  
Reading System ◽  
E Mail ◽  
Weighing Lysimeter

DESEMPENHO DE UM LISÍMETRO DE PESAGEM HIDRÁULICA COM DIFERENTES SISTEMAS DE LEITURA  ANTÔNIO HENRIQUE CARDOSO DO NASCIMENTO1; SUZANA MARIA GICO LIMA MONTENEGRO2; JOÃO AUDIFAX CÉSAR DE ALBUQUERQUE FILHO3; ÊNIO FARIAS DE FRANÇA E SILVA3 E NADIELAN DA SILVA LIMA3 1Unidade Acadêmica de Serra Talhada – UAST. Avenida Gregório Ferraz Nogueira, S/N Bairro: José Tomé de Souza Ramos CEP: 56909-535 - Serra Talhada / PE. E-mail: [email protected] de Engenharia Civil/UFPE, Av. Acadêmico Hélio Ramos, s/n. Cidade Universitária. CEP 50.740-530. Recife, PE. Fone: (81) 2126 7216. E-mail: [email protected] de Engenharia Agrícola/UFRPE. R. Dom Manoel de Medeiros, s/n, Dois Irmãos, CEP 52.171-900, Recife, PE. Fone: (81) 3320-6264. E-mails: [email protected]; [email protected]; [email protected]  1 RESUMO A lisimetria de pesagem é reconhecidamente a melhor técnica para determinar a evapotranspiração das culturas, sendo adotada como metodologia padrão para servir de referência na avaliação de outros métodos e para calibrar modelos de estimativa da evapotranspiração em diferentes culturas. Neste sentido, objetivou-se com o trabalho analisar o desempenho de lisímetro de pesagem hidráulica por meio de calibrações ao longo de um ano e através de estimativas de erros de medidas utilizando dois sistemas de pesagem: um sistema automatizado e o outro com sistema de leitura manual. O trabalho foi conduzido em Recife, no campus da Universidade Federal Rural de Pernambuco, no litoral de Pernambuco. A metodologia empregada na instalação e na calibração do lisímetro foi adequada, com coeficiente de determinação de 0,99 na equação de calibração. A relação entre a variação de massa e resposta na voltagem da célula de carga e/ou leitura no manômetro do lisímetro é descrita adequadamente por modelo linear com mínima histerese. O lisímetro de pesagem hidráulica, independente do sistema de leitura, obteve excelente estabilidade, sensibilidade, resolução e exatidão, ao longo de um ano, detectando variações de massa devido à chuva, irrigações e evapotranspiração nos momentos de calibração e durante o ano, mostrando-se adequado para a estimativa de demanda hídrica. Palavras-chave: evapotranspiração de referência, leitura manual, leitura automática.  NASCIMENTO, A. H. C; MONTENEGRO, S. M. G. L.; ALBUQUERQUE FILHO, J. A. C.; SILVA, E. F. F.; LIMA, N. S.ANNUAL PERFORMANCE OF A weighing lysimeter HYDRAULIC SYSTEMS WITH DIFFERENT READING  2 ABSTRACT The weighing lysimeter is recognized as the best technique to estimate evapotranspiration of crops, being adopted as standard reference method in the evaluation of other methods and to calibrate models to estimate evapotranspiration from different crops. In this sense, the objective of the present work is to analyze lysimeter performance through calibrations over a year and through estimates of measurement errors using hydraulic weighing lysimeters with two weighing systems: an automated system and another system with manual reading. The work was conducted in Recife, in the Federal Rural University of Pernambuco ( 8°01'05" south latitude, 34°56'48" west longitude, at an altitude of 6,4m).The methodology used in the lysimeter installation and calibration was adequate, resulting in a coefficient of determination of 0.99 in the calibration equation. The relationship between weight change and response to the load voltage and / or reading on the lysimeter cell gauge  is adequately described by a linear model with minimal hysteresis. The hydraulic weighing lysimeter, independent of the reading system showed excellent stability, sensitivity , resolution and accuracy over a year having detected variations in mass due to rain, irrigation and evapotranspiration , being suitable for the estimation of water demand. Keywords: reference evapotranspiration, manual reading, automatic reading.

scholarly journals Micrometeorological modeling and water consumption of tabasco pepper cultivated under greenhouse conditions

2021 ◽  
pp. 21-36
Author(s):  
Sérgio Weine Paulino Chaves ◽  
Rubens Duarte Coelho ◽  
Jéfferson De Oliveira Costa ◽  
Sergio André Tapparo
Keyword(s):  
Water Consumption ◽  
Crop Coefficient ◽  
Outdoor Environment ◽  
Production Cycle ◽  
Class A ◽  
Outdoor Environments ◽  
Irrigated Crops ◽  
Total Crop ◽  
The University

Micrometeorological variables of tabasco pepper cultivated under greenhouse and drip irrigated conditions have not been presented to date in literature, especially the water consumption of these plants, in terms of crop evapotranspiration (ETc) and crop coefficient (Kc). The determination of these variables is extremely important for the application of the correct amount of water to irrigated crops in these environments because PM FAO (56) standard methodology was idealized for outdoor environments. The objective of this work was to develop models of estimation of micrometeorological variables in greenhouse conditions and to determine the water demand, in terms of evapotranspiration (ET) and Kc, of the pepper (Capsicum frutescens L.), cv. Tabasco McIlhenny, drip irrigated using drainage lysimeters. The research was carried out in an experimental area located at the University of Sao Paulo (USP) in Piracicaba, SP, Brazil. The following micrometeorological variables were monitored: air temperature, air relative humidity (digital thermohygrometer) and evaporation (mini-pan) (EMT). Drainage lysimeters were used to obtain the ETc and the reference evapotranspiration (ETo) was estimated outside the greenhouse by the Penman Monteith (EToPM), Hargreaves and Samani (EToHS) methods and the class “A” pan method (ECA). It was concluded that the total value of mini-pan evaporation (EMT) inside the greenhouse was practically equal to EToPM, 5% lower than EToHS and 31% higher than ECA in the outdoor environment. ET values ranged from 0.28 to 2.42 mm day-1 and total crop ET was 446.43 mm. The Kc values for the first pepper production cycle were: 0.17 in the initial phase, 0.76 in the flowering and fruiting phase and 0.39 in the harvest phase, for the second production cycle, the value of Kc was 0.50 at the harvest phase.

scholarly journals Evaluation of Crop Coefficient, Cumulative and Dynamic Evapo-Transpiration of Winter Wheat under Deficit Irrigation Treatments in Weighing Lysimeter in Beijing, China

2017 ◽  
Vol 1 (1) ◽  
pp. 38 ◽  
Author(s):  
Mohamad Hesam Shahrajabian ◽  
Ali Soleymani ◽  
Peter Oko Ogbaji ◽  
Xuzhang Xue
Keyword(s):  
Winter Wheat ◽  
Precision Agriculture ◽  
Growth Yield ◽  
Crop Coefficient ◽  
Weather Data ◽  
Flowering Stage ◽  
Daily Weather Data ◽  
Irrigation Treatments ◽  
Jointing Stage ◽  
Weighing Lysimeter

<p><em>The availability of water plays an important role in plant growth, yield and quality of crops In 2012-2013 experiment, Irrigation treatments were (1): Irrigation before sowing (60 Liter), (2): Irrigation before sowing (30 Liter) + before freezing (30 Liter); (3): before sowing (30 Liter) + before freezing (30 Liter) + in the beginning of erecting stage (60 Liter) + at flowering stage (60 Liter); (4): before sowing (30 Liter) + before freezing (30 Liter) + at booting stage (60 Liter) + at flowering stage (60 Liter). The weighing lysimeter system is located in National Precision Agriculture Demonstration Station in Xiaotangshang Town of Beijing. The maximum evapotranspiration value in March, April and May was obtained for lysimeter 10 (I2) (558.70 kg), lysimeter 11 (I3) (467.25 kg), and lysimeter 10 (I2) (488.68 kg), respectively. Knowledge about changes of soil water changes during successive growing seasons from planting to final ripening is a necessary tool for an effective planning of irrigation programs, in order to improve both quality and quantity of crop. From October to June, evapo-transpiration trends increased steadily, especially in last four months, in which the lysimeter fields were covered by winter wheat completely. In 2013-2014 experiment, Irrigation treatments were (1) no irrigantion, (2) irrigation only at jointing stage (60L), (3) irrigation at jointing (60L) and flowering stage (60L), (4) at jointing stage (April 8th, 60L), 100% flowering stage (April 30th, 60L), and grain filling period (May 10th, 60L) before irrigation, crop coefficient (KC) was low and exactly after irrigation, it increased and then it decreased gradually day by day. R2 between evapotranspiration which is on the basis of hourly weather data and daily weather data with measured ET in big lysimter was 0.962 and 0.953, respectively. Evapotranspiration and crop coefficient almost exactly match according to R2 of the regression. In conclusion, evapotranspiration and KC give a closer idea of the value of research on relationship between evapotranspiration and crop coefficient.</em></p>

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