scholarly journals AVALIAÇÃO DE UM CONJUNTO LISIMÉTRICO NA DETERMINAÇÃO DA DEMANDA HÍDRICA DE MILHO CULTIVADO NO OUTONO-INVERNO

Irriga ◽  
2018 ◽  
Vol 23 (2) ◽  
pp. 204-219
Author(s):  
Éder Comunello ◽  
Paulo Cesar Sentelhas ◽  
Carlos Ricardo Fietz ◽  
Danilton Luiz Flumignan ◽  
Gessi Ceccon
Keyword(s):  
Water Demand ◽  
Crop Coefficient ◽  
Maize Crop ◽  
Number Of Factors ◽  
Phase 0 ◽  
Crop Water Demand ◽  
Surrounding Areas ◽  
Crop Coefficients ◽  
E Mail ◽  
Reliable Methods

AVALIAÇÃO DE UM CONJUNTO LISIMÉTRICO NA DETERMINAÇÃO DA DEMANDA HÍDRICA DE MILHO CULTIVADO NO OUTONO-INVERNO     ÉDER COMUNELLO1; PAULO CESAR SENTELHAS2; CARLOS RICARDO FIETZ1; DANILTON LUIZ FLUMIGNAN1 E GESSI CECCON1   1Embrapa Agropecuária Oeste, Rodovia BR 163, km 253,6, Cx. Postal 449, CEP 79804-970, Dourados, MS, Brasil. Fone:(67) 3416-9700. E-mail(s): {eder.comunello, carlos.fietz, danilton.flumignan, gessi.ceccon}@embrapa.br 2Departamento de Engenharia de Biossistemas, Escola Superior de Agricultura Luiz de Queiroz (USP/Esalq), Av. Pádua Dias, 11, CEP 13418-900, Piracicaba, SP, Brasil. Fone:(19) 3429-4283. E-mail: [email protected]     1 RESUMO   O conhecimento da evapotranspiração é fundamental para a determinação da demanda hídrica dos cultivos e a lisimetria está entre os métodos mais confiáveis para sua determinação. Uma série de fatores ligados à construção e operação dos lisímetros pode interferir na confiabilidade das medidas tomadas, de modo que o presente trabalho buscou avaliar se ligeiras diferenças nesses fatores seriam suficientes para gerar diferenças estatisticamente significativas entre as séries obtidas de três lisímetros similares. O trabalho experimental foi implantado em março de 2014, em Dourados, MS, com o conjunto lisimétrico disposto em uma área de 0,49 ha, cultivada com um híbrido de milho superprecoce irrigado (125 dias). Variáveis fitotécnicas avaliadas demonstraram a homogeneidade de condições entre os lisímetros e entorno. Não havendo diferenças significativas entre séries, estabeleceu-se um coeficiente de cultivo (Kc) médio. Partindo de 0,54 na fase inicial (0-15 DAE), houve incremento linear dos valores de Kc, atingindo 1,37 no pendoamento (50 DAE). Desse ponto, houve redução gradual dos valores, chegando a 0,80 na maturação fisiológica (110 DAE) e 0,40 na colheita. A demanda hídrica calculada para todo ciclo foi de 475 mm. A análise complementar do saldo de radiação e temperatura do ar foram fundamentais para interpretação dos resultados.   Palavras-chave: coeficientes de cultura, lisímetros de pesagem, milho safrinha.     COMUNELLO, E.; SENTELHAS, P. C.; FIETZ, C. R.; FLUMIGNAN, D. L. E CECCON, G. EVALUATION OF A SET OF LYSIMETERS FOR DETERMINING WATER DEMAND OF AUTUMN-WINTER MAIZE CROP     2 ABSTRACT   Evapotranspiration is a key variable to determine crop water demand, and lysimetry is among the most reliable  methods for its determination. A number of factors related to lysimeters construction and operation can interfere with the reliability of measurements. Thus, this study aimed at assessing whether slightly differences could result in significant differences among the series of three similar lysimeters. The experiment was started in March, 2014, in Dourados county, MS, Brazil, with the lysimetric set located in an area of 0.49 ha where a short cycle maize hybrid (125 days) was cropped with irrigation. Plant measurements showed homogeneity conditions among lysimeters and their surrounding areas. With no significant differences among the series, an average crop coefficient (Kc) was used. The value of 0.54 was obtained in the initial phase (0-15 DAE). Right after, Kc values presented linear increment, reaching 1.37 in the tasseling stage (50 DAE). From this point, there was gradual decrease in values,  reaching 0.80 at physiological maturity (110 DAE) and 0.40 at harvest. Water demand calculated for the entire cycle was 475 mm. A complementary analysis of net radiation and air temperature was important to evaluate the results obtained.   Keywords: crop coefficients, weighing lysimeters, off-season maize.

scholarly journals DEMANDA HÍDRICA DO MARACUJAZEIRO AMARELO (Passiflora edulis Sims f. flavicarpa Deg.)

Irriga ◽  
2002 ◽  
Vol 7 (3) ◽  
pp. 185-190
Author(s):  
Ana Alexandrina Gama da Silva ◽  
Antonio Evaldo Klar
Keyword(s):  
Water Demand ◽  
Crop Coefficient ◽  
Passion Fruit ◽  
Crop Water ◽  
Passiflora Edulis ◽  
Crop Water Demand ◽  
Passiflora Edulis Sims ◽  
E Mail ◽  
Fruit Formation ◽  
Yellow Passion Fruit

DEMANDA HÍDRICA DO MARACUJAZEIRO AMARELO (Passiflora edulis Sims f. flavicarpa Deg.)   Ana Alexandrina Gama da SilvaEmbrapa Tabuleiros Costeiros, CP 44, CEP 49025-040, Aracaju, SE. E-mail: [email protected] Evaldo KlarDepartamento de Engenharia Rural, Faculdade de Ciências Agronômicas, Universidade Estadual Paulista, CP 237, CEP 18603-970, Botucatu, SP. E-mail: [email protected] Científico do CNPq   1 RESUMO  Determinou-se à demanda hídrica e o coeficiente de cultivo (Kc) do maracujá amarelo (Passiflora edulis Sims f. flavicarpa Deg.), seleção Sul-Brasil, cultivado sob irrigação localizada, no município de Botucatu-SP (22o 51’ S,  48o 26’ W). A evapotranspiração máxima da cultura (ETc) e a evapotranspiração de referência (ETo) foram medidas em lisímetros de nível de lençol freático constante, durante o período de 29 de setembro de 2000 a 20 de julho de 2001. Os valores da ETc e ETo foram de 954,98 mm e  1.069,21 mm, respectivamente, durante todo o período medido. Os valores de Kc variaram de 0,42 a 1,12, com os valores máximos registrados entre 150 e 210 dias após o transplantio das mudas no campo (DAT), período correspondente aos estádios fenológicos de florescimento e formação dos frutos.  UNITERMOS: Passiflora edulis, evapotranspiração, coeficiente de cultivo (Kc).   SILVA, A.A.G. da, KLAR, A.E.  YELLOW PASSION FRUIT (Passiflora edulis Sims f. flavicarpa Deg.) CROP: WATER DEMAND.   2 ABSTRACT  Crop water demand and crop water coefficient (Kc = ETc/ETo) of yellow passion fruit were evaluated in constant level lysimeters under drip irrigation from September 21, 2000 to July 31, 2001 in Botucatu-SP. The maximum crop water demand (ETc) and the Reference Evapotranspiration (ETo), measured by lysimeters, were 954.98 mm and 1,069.21 mm, respectively, during all period measured. The values of Kc varied from 0.42 to 1.12  with maximum values registered from 150 to 210 days following transplanting during flowering and fruit formation  phases.  KEYWORDS: Passiflora edulis, evapotranspiration, crop coefficient (Kc). 

Computing Maize Crop Coefficients in the Port Harcourt area, Nigeria, using a Class a Pan Evaporimeter

1997 ◽  
Vol 26 (3) ◽  
pp. 185-189 ◽  
Author(s):  
J.M. Ayotamuno ◽  
A.J. Akor ◽  
S.C. Teme ◽  
E.W.U. Essiet ◽  
N.O. Isirimah ◽  
...  
Keyword(s):  
Potential Evapotranspiration ◽  
Crop Coefficient ◽  
Grain Filling ◽  
Maize Crop ◽  
Class A ◽  
Port Harcourt ◽  
The Mean ◽  
Crop Coefficients ◽  
Tropical Climates ◽  
Class A Pan

Farmers in hot tropical climates know the importance of irrigation, but for irrigation to be used effectively the water requirement of the crop must be known. This is computed as the product of the potential evapotranspiration (PET) and the crop coefficient (Kc). While the PET can easily be obtained through various methods, including pan evaporimeters, the Kc in the Port Harcourt area for maize and other crops was not known. The main objective of this research, therefore, was to obtain maize crop coefficients at different stages of growth using non-weighing water table lysimeters and a class A pan. The estimated mean maize evapotranspiration (ET) values for the establishment, vegetative, pollination, and grain-filling stages were 29,98,84 and 98 mm, respectively. Values ranging from 0.18 to 1.08 were calculated for the mean crop coefficients for 10-day periods.

scholarly journals Validation of Crop Coefficients and Water Requirement of Maize Crop in the Temperate Climatic Region of India

2020 ◽  
Vol 8 (5) ◽  
pp. 5132-5138
Keyword(s):  
Water Balance ◽  
Reference Evapotranspiration ◽  
Crop Coefficient ◽  
Growth Period ◽  
Water Requirement ◽  
Balance Method ◽  
Growth Stages ◽  
Maize Crop ◽  
Water Balance Method ◽  
Crop Coefficients

The field study was conducted on Lysimeter by employing the soil water balance method to compute the water requirement and Crop coefficient of Maize in the temperate climatic zone of India. Non-weighing type lysimeters (drainage type) of 2 × 1.5 × 2 m was installed to compute the irrigation requirement, actual crop evapotranspiration (ETc) and actual crop coefficient of maize by water balance method. The water requirement of maize was found 410.4 mm using lysimeter data. The mean daily reference evapotranspiration (ETo) of maize ranged from 0.91 mm/day in the starting growth period to 5.29 mm/day at midseason. The peak ETo of Maize was found 6.3mm/day. The computed crop coefficient (Kc) values of Maize for diffrent crop growth stages were 0.53 for intial, 0.93 for development , 1.05 for mid-season, and 0.78 for late season .A Correlation was also established between Penman-Monteith (P-M) and four other reference Evapotranspiration methods.

scholarly journals WATER DEMAND, CROP COEFFICIENT AND UNCOUPLING FACTOR OF COWPEA IN THE EASTERN AMAZON

2017 ◽  
Vol 30 (1) ◽  
pp. 190-200 ◽  
Author(s):  
VIVIAN DIELLY DA SILVA FARIAS ◽  
◽  
MARCUS JOSÉ ALVES DE LIMA ◽  
HILDO GIUSEPPE GARCIA CALDAS NUNES ◽  
DENIS DE PINHO SOUSA ◽  
...  
Keyword(s):  
Water Demand ◽  
Irrigation Management ◽  
Gaussian Model ◽  
Crop Coefficient ◽  
Climatic Conditions ◽  
Degree Days ◽  
Local Conditions ◽  
Area Index ◽  
Crop Coefficients ◽  
Accumulated Degree Days

ABSTRACT Cowpea has great socioeconomic importance in the northeastern part of Pará state. However, in order to provide suitable irrigation management during the dry period this region requires solid information regarding water demand by regional crops. This research aims to determine the water demand, the crop coefficient (Kc) and the uncoupling factor during the different development stages of cowpea in the northeast of Pará. The crop evapotranspiration (ETc) was measured by drainage lysimeters. This information was coupled to the reference evapotranspiration (ETo) to obtain the crop coefficients, which were used to adjust the model function of accumulated degree-days and the leaf area index (LAI). The uncoupling factor was estimated to indicate the factors that control evapotranspiration. The ETc values reached a cumulative total of 267.73 mm ± 10.21 mm during the cowpea cycle. The average value of the uncoupling factor was 0.66. This indicates that the cowpea crop does not fully uncouple from the atmosphere underneath the climatic conditions in northeast Pará. The cowpea Kc values presented averages of 0.8, 1.4 and 0.8 in the vegetative phase, reproductive phase and final stage, respectively. The Gaussian model showed an excellent fit for the estimation of Kc values based on accumulated degree days and the LAI. These amounts differ from others found in the literature. Therefore, it reinforces the necessity for an assessment of crop coefficients under local conditions and for the employment of more precise methods.

scholarly journals COEFICIENTES DE CULTURA DA CHICÓRIA (Cichorium endivia L.)

Irriga ◽  
2002 ◽  
Vol 7 (2) ◽  
pp. 65-80
Author(s):  
Aquiles Sandanielo ◽  
Dalva Martinelli Cury Lunardi
Keyword(s):  
Irrigation Management ◽  
Crop Coefficient ◽  
Agricultural Science ◽  
Transparent Plastic ◽  
Mato Grosso ◽  
De Se ◽  
Cichorium Endivia ◽  
Science College ◽  
Crop Coefficients ◽  
E Mail

COEFICIENTES DE CULTURA DA CHICÓRIA (Cichorium endivia L.)  Aquiles SandanieloDepartamento de Solos e Engenharia Rural, Universidade Federal de Mato Grosso,CEP 78060-900, Cuiabá – MT, Fone (0xx65) 615-8602Dalva Martinelli Cury LunardiDepartamento de Recursos Naturais, Faculdade de Ciências Agronômicas, Universidade Estadual Paulista, CEP 18603-970, Botucatu – SP, E-mail: [email protected]   1 RESUMO  O conhecimento do coeficiente de cultura (Kc) permite a estimativa das necessidades hídricas de uma cultura, sendo fundamental para o manejo da irrigação. Nesta pesquisa, conduzida na área experimental do Departamento de Recursos Naturais da Faculdade de Ciências Agronômicas – FCA/UNESP, Campus de Botucatu, utilizou-se, para medida da evapotranspiração da cultura (ETc), 4 evapotranspirômetros de nível freático constante. Desses, 2 foram cobertos com plástico transparente rente ao solo, a fim de se evitar a evaporação. A evapotranspiração de referência (ETo) foi estimada pelo método de Penman-Monteith, sendo o coeficiente de cultura da chicória (Cichorium endivia L.) dado pela relação: , em suas diversas fases de desenvolvimento. Os valores de (Kc) obtidos evidenciaram um comportamento crescente durante todo o período vegetativo, com a influência da cobertura plástica na fase inicial quando a evaporação do solo representa uma fração considerável da evapotranspiração  da cultura .  UNITERMOS: evapotranspiração, coeficiente de cultura, Cichorium endivia L.   SANDANIELO, A., LUNARDI, D.M.C. CROP COEFFICIENTS OFENDIVE (Cichorium endivia L.)   2 ABSTRACT  The crop coefficient (Kc) is very important for irrigation management programs. This research carried out at the experimental area of the Natural Resource Department of the Agricultural Science College – FCA/UNESP has used  4 constant level evapotranspirometers to determine crop evapotranspiration (ETc) and crop coefficient (Kc) of endive. The soil evaporation was obstructed by a transparent plastic cover over 2 of the evapotranspirometers. The reference evapotranspiration was estimated by Penman-Monteith method. The crop coefficient Kc, during all vegetative crop period was obtained by kc=ETc/Eto. The kc values increased from transplanting to harvest showing   influence of the plastic cover especially in the initial phase.  KEYWORDS: evapotranspiration, crop coefficient, Cichorium endivia L.

Future Climatic Patterns and Sustainability of Current Cropping Patterns in a Water-Scarce River Basin of Eastern India 

2021 ◽  
Author(s):  
Smaranika Mahapatra ◽  
Madan Kumar Jha
Keyword(s):  
Water Demand ◽  
Agricultural Sector ◽  
Monsoon Rainfall ◽  
Baseline Period ◽  
Eastern India ◽  
Crop Water ◽  
Cropping Patterns ◽  
Water Demands ◽  
Crop Water Demand ◽  
Water Scarce

<p>Agricultural sector, being the largest consumer of water is greatly affected by climatic variability and disasters. Most parts of the world already face an enormous challenge in meeting competitive and conflicting multi-sector water demands. Climate change has further exacerbated this challenge by putting the sustainability of current cropping patterns and irrigation practices in question. For ensuring climate-resilient food production, it is crucial to examine the patterns of the projected climate and potential impacts on the agricultural sector at a basin scale. Hence, this study was carried out for an already water-scarce basin, Rushikulya River basin (RRB), located in the coastal region of eastern India. The bias-corrected NorESM2-MM general circulation model of Coupled Model Intercomparison Project-6 (CMIP6) was used in this study under four shared socioeconomic pathway (SSPs) scenarios, namely SSP126, SSP245, SSP370 and SSP585. The projected climatic parameters and crop water demands of the basin were analyzed assuming existing cropping pattern in the future. Analysis of the results reveals a significant and rapid increase in the temperature at a rate of 0.02-0.5ºC/year during 2026-2100 under all SSPs except SSP126, whereas the rainfall is expected to increase slightly during 2026-2100 as compared to the baseline period (1990-2016), especially in the far future (2076-2100) under all the SSPs. In contrast, monsoon rainfall is predicted to decrease under SSP245 and SSP370, while a slight increase in the monsoon rainfall is evident under SSP126 and SSP585. Although the rainy days will decrease slightly in the future 25-year time window, the number of heavy rainfall events is predicted to increase by two to three times. Also, retrospective analysis of rainfall and evapotranspiration suggested an existence of rainfall deficit (rainfall-evapotranspiration) in the basin throughout the year, except during July to September. The rainfall deficit in the basin during 2026-2100 is found to remain more or less same in the non-monsoon season, except for the month of October under SSP245, SSP370 and SSP585 scenarios where deficit increases by two folds. Rainfall is expected to be in surplus by 4 to 5 times higher under all SSPs except for SSP245. As to the evapotranspiration, an insignificant increasing trend is observed under future climatic condition with only 2 to 4% rise in the crop water demand compared to the baseline period. As the basin is already water stressed during most months in a year under baseline and future climatic conditions, continuing the current practice of monsoon paddy dominant cultivation in the basin will further aggravate this situation. The results of this study will be helpful in formulating sustainable irrigation plans and adaptation measures to address climate-induced water stress in the basin.</p><p><strong>Keywords:</strong> Climate change; CMIP6; SSP; Monsoon rainfall; Temperature; Crop water demand.</p>

scholarly journals STATISTICAL EQUATIONS OF MAIZE CROP COEFFICIENT (Kc)

2020 ◽  
Vol 34 (1) ◽  
pp. 87-102
Author(s):  
S.A.A. El-Raires, ◽  
T.A Aboul Defan, ◽  
A. Sh .A. Osman,
Keyword(s):  
Crop Coefficient ◽  
Maize Crop

scholarly journals Determining Water Use and Crop Coefficients of Five Woody Landscape Plants

2006 ◽  
Vol 24 (3) ◽  
pp. 160-165 ◽  
Author(s):  
G. Niu ◽  
D.S. Rodriguez ◽  
R. Cabrera ◽  
C. McKenney ◽  
W. Mackay
Keyword(s):  
Leaf Area ◽  
Water Use ◽  
Culture System ◽  
Growth Parameters ◽  
Growth Index ◽  
Crop Coefficient ◽  
Nerium Oleander ◽  
Culture Systems ◽  
Unit Leaf ◽  
Crop Coefficients

Abstract The water use and crop coefficient of five woody landscape species were determined by growing the shrubs both in 56-liter (15 gal) drainage lysimeters and in above-ground 10-liter containers (#3). Water use per plant, crop coefficient and overall growth parameters differed by species and culture system. Of the five species tested, Buddleia davidii ‘Burgundy’ and Nerium oleander ‘Hardy Pink’ had higher water use per plant in the lysimeters than in the containers. Water use per plant for Abelia grandiflora ‘Edward Goucher’, Euonymus japonica and Ilex vomitoria ‘Pride of Houston’ was the same for the two culture systems. Crop coefficient and growth index of A. grandiflora, E. japonica, and I. vomitoria was similar between the two systems. The growth index of B. davidii and N. oleander was much higher in the lysimeters than in the containers. Abelia grandiflora and E. japonica had more growth in the containers than in the lysimeters while I. vomitoria had slightly larger leaf area in the lysimeters than in the containers. The culture system did not affect the water use per unit leaf area of all species. Therefore, our results indicated that by quantifying the leaf area, the plant water use in the two culture systems is exchangeable.

Sign in / Sign up

Export Citation Format

Share Document