scholarly journals DETERMINATION OF ACTUAL CROP EVAPOTRANSPIRATION (ETC) AND DUAL CROP COEFFICIENTS (KC) FOR COTTON, WHEAT AND MAIZE IN FERGANA VALLEY: INTEGRATION OF THE FAO-56 APPROACH AND BUDGET

2020 ◽  
Vol 7 (05) ◽  
Keyword(s):  
Crop Evapotranspiration ◽  
Crop Coefficients

scholarly journals MEDIDAS DA EVAPOTRANSPIRAÇÃO (ETc) E COEFICIENTE DE CULTURA (Kc) DO CRAVO-DE-DEFUNTODENTRO E FORA DE AMBIENTE PROTEGIDO.

Irriga ◽  
2005 ◽  
Vol 10 (2) ◽  
pp. 155-165 ◽  
Author(s):  
Millena Ariana Boueri ◽  
Raúl Andres Martinez ◽  
Dalva Martinelli Cury Lunardi
Keyword(s):  
Initial Phase ◽  
Culture Medium ◽  
Crop Coefficient ◽  
Crop Evapotranspiration ◽  
Vegetative Development ◽  
Radiation Reduction ◽  
Development Stages ◽  
Experimental Area ◽  
Crop Coefficients

MEDIDAS DA EVAPOTRANSPIRAÇÃO (ETc) E COEFICIENTE DE CULTURA (Kc) DO CRAVO-DE-DEFUNTODENTRO E FORA DE AMBIENTE PROTEGIDO.  Millena Ariana Boueri; Raúl Andres Martinez; Dalva Martinelli Cury LunardiDepartamento de Ciências Ambientais, Faculdade de Ciências Agronômicas, Universidade Estadual Paulista, Botucatu, SP, [email protected]  1 RESUMO O objetivo deste trabalho foi avaliar o consumo de água do cravo-de-defunto (Tagetes sp.), dentro e fora de ambiente protegido, com uso de lisímetros de lençol freático constante, para determinação da evapotranspiração da cultura (ETc) e dos coeficientes de cultura (Kc) em todos os seus estádios de desenvolvimento. O experimento foi realizado na área experimental do Departamento de Recursos Naturais – Setor Ciências Ambientais da Faculdade de Ciências Agronômicas da Universidade Estadual Paulista, Campus de Botucatu, no período de 21/05/02 a 09/08/02. A área experimental foi constituída de duas áreas de 280m2, sendo uma na condição de campo e a outra em ambiente protegido tipo arco, com cobertura de polietileno de baixa densidade (PEBD), difusor de luz, com 150mm de espessura, tendo nas laterais sombrite com 50% de redução da radiação solar. Os resultados mostraram que a ETc total, para um ciclo de 81 dias, foi de 115 e 119mm, nas condições de ambiente protegido e campo, respectivamente, com médias de 1,4 e 1,5mm d-1. Foram observados valores médios de Kc de 0,48 e 0,71 na fase inicial, 0,87 e 0,93 no desenvolvimento vegetativo, com máximos de 1,15 e 0,85 na floração, e 0,94 e 0,70 no final do ciclo, nas condições de ambiente protegido e campo, respectivamente. UNITERMOS: lisímetro; Tagetes sp.  BOUERI, M. A.; MARTINEZ, R. A.; CURY LUNARDI, D. M. CROP EVAPOTRANSPIRATION (ETc) AND CROP COEFFICIENT (Kc) MEASUREMENTS OF TAGETES, INSIDE AND OUTSIDE GREENHOUSE  2 ABSTRACT The objective of this work was to measure the water consumption of the Tagetes sp. crop, inside and outside of greenhouse, through water table lysimeters, for determination of the crop evapotranspiration (ETc) and crop coefficients (Kc) in all its development stages. The experiment was carried in the experimental area of the Department of Natural Resources - Section Environmental Sciences of the Faculdade de Ciências Agronômicas, UNESP, Botucatu, SP, 21/05/02 to 09/08/02. The experimental area was constituted of two areas of 280m2, being one in the field condition and the other in arch type greenhouse, with polyethylene low density (PEBD) covering, light difusor, with 150mm of thickness, and polypropylene screen with 50% of solar radiation reduction in the lateral. The results showed that the total ETc, for a cycle of 81 days, was of 115 and 119mm, in the conditions of greenhouse and field, respectively, with averages of 1.4 and 1.5mm d-1. The crop coefficient varied in agreement with the stages of development of the culture, medium values of 0.48 and 0.71 having been observed in the initial phase, 0.87 and 0.93 in the vegetative development, with maxima of 1.15 and 0.85 in the blossom, and 0.94 and 0.70 in the end of the cycle, in the conditions of greenhouse and field, respectively. KEYWORDS: lisymeter; Tagetes sp.

scholarly journals Shoot water content and reference evapotranspiration for determination of crop evapotranspiration

2017 ◽  
Vol 25 (4) ◽  
pp. 387
Author(s):  
J.O. Omondi ◽  
N.W. Mungai ◽  
J.P. Ouma ◽  
F.P. Baijukya
Keyword(s):  
Water Content ◽  
Reference Evapotranspiration ◽  
Crop Evapotranspiration

scholarly journals Performance of methods for estimation of table beet water requirement in Alagoas

2018 ◽  
Vol 22 (3) ◽  
pp. 189-193 ◽  
Author(s):  
Daniella P. dos Santos ◽  
Célia S. dos Santos ◽  
Leiliane M. da Silva ◽  
Márcio A. L. dos Santos ◽  
Cícero G. dos Santos
Keyword(s):  
Water Use ◽  
Standard Method ◽  
Water Scarcity ◽  
Performance Index ◽  
Reference Evapotranspiration ◽  
Irrigation Management ◽  
Crop Evapotranspiration ◽  
Abstract Optimization ◽  
Crop Coefficients ◽  
Drainage Lysimeter

ABSTRACT Optimization of water use in agriculture is fundamental, particularly in regions where water scarcity is intense, requiring the adoption of technologies that promote increased irrigation efficiency. The objective of this study was to evaluate evapotranspiration models and to estimate the crop coefficients of beet grown in a drainage lysimeter in the Agreste region of Alagoas. The experiment was conducted at the Campus of the Federal University of Alagoas - UFAL, in the municipality of Arapiraca, AL, between March and April 2014. Crop evapotranspiration (ETc) was estimated in drainage lysimeters and reference evapotranspiration (ETo) by Penman-Monteith-FAO 56 and Hargreaves-Samani methods. The Hargreaves-Samani method presented a good performance index for ETo estimation compared with the Penman-Monteith-FAO method, indicating that it is adequate for the study area. Beet ETc showed a cumulative demand of 202.11 mm for a cumulative reference evapotranspiration of 152.00 mm. Kc values determined using the Penman-Monteith-FAO 56 and Hargreaves-Samani methods were overestimated, in comparison to the Kc values of the FAO-56 standard method. With the obtained results, it is possible to correct the equations of the methods for the region, allowing for adequate irrigation management.

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

Water requirements of olive orchards–II: determination of crop coefficients for irrigation scheduling

2005 ◽  
Vol 24 (2) ◽  
pp. 77-84 ◽  
Author(s):  
F. Orgaz ◽  
L. Testi ◽  
F.J. Villalobos ◽  
E. Fereres
Keyword(s):  
Irrigation Scheduling ◽  
Water Requirements ◽  
Crop Coefficients

Determination of growth-stage-specific crop coefficients (KC) of maize and sorghum

2009 ◽  
Vol 96 (12) ◽  
pp. 1698-1704 ◽  
Author(s):  
Giovanni Piccinni ◽  
Jonghan Ko ◽  
Thomas Marek ◽  
Terry Howell
Keyword(s):  
Growth Stage ◽  
Crop Coefficients

scholarly journals Determination of Growth Stage-Specific Crop Coefficients (Kc) of Sunflowers (Helianthus annuus L.) under Salt Stress

Water ◽  
2017 ◽  
Vol 9 (3) ◽  
pp. 215 ◽  
Author(s):  
Minghai Hong ◽  
Wenzhi Zeng ◽  
Tao Ma ◽  
Guoqing Lei ◽  
Yuanyuan Zha ◽  
...  
Keyword(s):  
Salt Stress ◽  
Helianthus Annuus ◽  
Growth Stage ◽  
Helianthus Annuus L ◽  
Crop Coefficients

scholarly journals Evapotranspiration and crop coefficients of Moringa oleifera under semi-arid conditions in Pernambuco

2017 ◽  
Vol 21 (12) ◽  
pp. 840-845 ◽  
Author(s):  
Célia S. dos Santos ◽  
Abelardo A. de A. Montenegro ◽  
Márcio A. L. dos Santos ◽  
Elvira M. R. Pedrosa
Keyword(s):  
Moringa Oleifera ◽  
Reference Evapotranspiration ◽  
Temporal Variations ◽  
Experimental Unit ◽  
Crop Evapotranspiration ◽  
Water Restriction ◽  
Phenological Stages ◽  
Indirect Methods ◽  
Crop Coefficients ◽  
Semi Arid

ABSTRACT Efficient water use in agriculture is fundamental, especially in semi-arid regions where water scarcity is intense. The aim of this study was to estimate water requirements and crop coefficients in the different phenological stages of Moringa oleifera. The experiment was carried out from February to April 2015 at the Experimental Unit for Reuse and Hydrological Management, located in Mutuca, PE (7º 15’ 18’’ S, 35º 52’’ 40’’ W, 550 m). A lysimeter was used to estimate crop evapotranspiration. Reference evapotranspiration (ETo) was estimated by indirect methods. In the lysimeter, soil salinity and leaf water potential of the crop were monitored. The direct and indirect methods presented an excellent performance compared with the standard grass-lysimeter, especially Hargreaves-Samani, which presented a remarkable result for the study area. Crop coefficients (Kc) ranged from 0.73 to 1.73 in the different phenological stages. Moringa crop evapotranspiration (ETc) exhibited temporal variations, with a cumulative rate of 139.8 mm, for a cumulative reference evapotranspiration of 130.97 mm. Moringa plants showed slight water restriction, at the times of lower solar radiation.

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