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 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

scholarly journals Water requirement and crop coefficients of sorghum in Apodi Plateau

2021 ◽  
Vol 25 (10) ◽  
pp. 684-688
Author(s):  
João G. A. Lima ◽  
José Espínola Sobrinho ◽  
José F. de Medeiros ◽  
Paula C. Viana ◽  
Rudah M. Maniçoba
Keyword(s):  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
Irrigation Management ◽  
High Growth ◽  
Crop Coefficient ◽  
Northeastern Brazil ◽  
Crop Evapotranspiration ◽  
Water Requirements ◽  
Total Crop ◽  
Crop Coefficients

ABSTRACT Sorghum is of significant economic importance for Northeastern Brazil, since it exhibits high growth rates in regions with irregular rainfall distribution and high temperatures, and is an alternative to corn, which has greater water requirements. Despite being a traditional crop in the region, there are few studies on irrigation management in the Apodi plateau. The aim of this study was to determine the evapotranspiration of the crop and the crop coefficient (Kc) for the different stages of sorghum growth in two cycles, and establish the relationship between the Kc and the normalized difference vegetation index (NDVI) obtained by radiometry. Two weighing lysimeters were used to estimate crop evapotranspiration (ETc). Reference evapotranspiration (ETo) was estimated by the Penman-Monteith method (FAO) and the crop coefficient determined using two methodologies: simple Kc and dual Kc. Total crop evapotranspiration in the two cycles was 452 and 557 mm. The ETc value was 23% higher in the second cycle compared to the first. The maximum Kc values for the first and second cycles were 1.21 and 1.35, respectively, using the dual Kc methodology. The linear relationship found between the Kc values and the NDVI allows monitoring and estimating the water requirements of the crop.

scholarly journals Estimativa da Evapotranspiração e dos Coeficientes de Cultura para Diferentes Fases de Desenvolvimento da Melancia (Evapotranspiration Estimate and Cultural Factors for Diferent Stages of Development of Watermelon)

2013 ◽  
Vol 6 (5) ◽  
pp. 1417 ◽  
Author(s):  
Antonio Ricardo Santos de Andrade ◽  
Adiel Felipe da Silva Cruz ◽  
Edson Carlos dos Santos Cavalcante ◽  
José Claudio Faustino de Albuquerque ◽  
Werônica Meira de Souza
Keyword(s):  
Irrigation System ◽  
Irrigation Management ◽  
Crop Coefficient ◽  
Main Element ◽  
Experimental Unit ◽  
Management Approach ◽  
Crop Evapotranspiration ◽  
Crop Development ◽  
Maximum Water ◽  
Crop Coefficients

A evapotranspiração constitui no principal elemento envolvido nas exigências hídricas das culturas, sua estimativa deve ser precisa, sendo utilizada no manejo da irrigação, como também na tomada de decisão que consiste em determinar se a cultura atende as condições edafoclimáticas da região. Um dos métodos de manejo da irrigação que se destaca por aproximar ao máximo a quantidade ideal de água a ser oferecida à cultura é a determinação da evapotranspiração da cultura (ETc). Sendo assim, o presente trabalho objetivou em estimar a evapotranspiração da cultura (ETc) e do coeficiente de cultura (Kc) para diferentes fases fenológicas na melancia. A variedade utilizada foi a Crimson Sweet, semeados no espaçamento de 1,5 m x 0,75 m onde o sistema de irrigação empregado foi por gotejamento. Para tanto, o experimento foi conduzido na área experimental da Unidade acadêmica de Garanhuns da UFRPE, no período de 01/02/2013 a 07/04/2013. O cálculo do Kc foi obtido pela relação entre ETc e ETo calculada pelo método do balanço hídrico do solo e estimada pelo método de tanque Classe A, respectivamente, no período de 01 até 66 dias após o plantio (DAP). A evapotranspiração média da cultura da melancia nos 66 dias do balanço foi de 11,36 mm dia-1 e os valores médios dos coeficientes de cultivo (Kc) obtidos pela relação entre ETc e ETo foram 1,80; 1,97; 1,84 e 1,60 para a fase vegetativa, floração, maturação e colheita, respectivamente, e o máximo consumo de água pela cultura deu-se no estádio de floração. A B S T R A C T Evapotranspiration is the main element involved in crop water requirements, your estimate should be accurate, by using management of irrigation systems also with decision making that is whether the culture meets the ecological conditions of the region. One of the methods of irrigation management approach that stands out the most optimum amount of water to be offered to culture is the estimate of crop evapotranspiration (ETc). Therefore, this study aimed to determine the crop evapotranspiration (ETc) and crop coefficient (Kc) for different stages of crop development watermelon. We used the Crimson Sweet variety, sown at a spacing of 1.5 mx 0.75 m where the irrigation system was used drip. Therefore, an experiment was conducted at the experimental unit of Academic Garanhuns/UFRPE, from 01/02/2013 to 07/04/2013. The calculation of Kc was obtained by the ratio of ETc and ETo calculated by the method of soil water balance and estimated by the method of Class A pan, respectively, from 01 to 66 days after planting (DAP). The average evapotranspiration of watermelon crop in 66 days the balance was 11.36 mm day-1 and the average values of crop coefficients (Kc) obtained by the relationship between ETc and ETo were 1.80, 1.97, 1, 84 and 1.60 for the vegetative stage, flowering, ripening and harvesting, respectively, and the maximum water consumption by the crop yield in the flowering stag

Effects of Subsurface Water Retention Technology on Crop Coefficient and Crop Evapotranspiration of Eggplant

2018 ◽  
Vol 24 (8) ◽  
pp. 96
Author(s):  
Sabah Anwer Almasraf ◽  
Ahmed Hatif Salim
Keyword(s):  
Water Retention ◽  
Sandy Loam ◽  
Crop Coefficient ◽  
Growing Season ◽  
Control Plot ◽  
Subsurface Water ◽  
Crop Evapotranspiration ◽  
Initial Development ◽  
Loam Soil ◽  
Crop Coefficients

In this paper, the effects of subsurface water retention technology (SWRT) on crop coefficient (kc) and crop evapotranspiration (ETc) of eggplant were investigated in sandy loam soil. For this purpose, two treatments plot (with SWRT and without using SWRT) were adopted during 93 days of cultivation. The study was conducted in open field within Al-Fahamah Township, Baghdad, Iraq during summer growing season 2017. The accumulated ETc of eggplant was 403.3 and 515.2 mm for SWRT treatment and control plot, respectively by reduction percentage 21.7 %. The average values of ETc during the growing season were 4.3 and 5.5 mm/day, respectively. The crop coefficients value during the growing stages for initial, development, mid-season and late season stages was 0.15, 0.41, 0.81 and 0.78 in SWRT treatment plot for the respective stages and for the control plot one 0.2, 0.46, 1.13 and 0.9, respectively.  

scholarly journals Lysimeter-Based Water Use and Crop Coefficient of Drip-Irrigated Potato in an Arid Environment

Agronomy ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 756 ◽  
Author(s):  
Alataway ◽  
Al-Ghobari ◽  
Mohammad ◽  
Dewidar
Keyword(s):  
Water Use ◽  
Irrigation Schedule ◽  
Crop Coefficient ◽  
Arid Environment ◽  
Crop Evapotranspiration ◽  
Food And Agriculture ◽  
Food And Agriculture Organization ◽  
Use Efficiency ◽  
Monteith Equation

The determination of the water requirements and crop coefficient (Kc) of agricultural crops helps to create an appropriate irrigation schedule, and with the effective management of irrigation water. The aim of this research was to estimate the water requirement, Kc, and water-use efficiency (WUE) of potato using non-weighing-type lysimeters in four regions of the Kingdom of Saudi Arabia (Qassiem, Riyadh, Al-Jouf, and Eastern). Our results clearly show that the accumulated values of the measured crop evapotranspiration of potato derived from the lysimeters were 573, 554, 592, and 570 mm, while the accumulated values of the predicted crop evapotranspiration from Penman-Monteith equation based on FAO (Food and Agriculture Organization) were 651, 632, 672, and 647 mm for the Qassiem, Riyadh, Al-Jouf, and Eastern regions, respectively. The Kc values of potato obtained from the lysimeters were Kc initial (0.58, 0.54, 0.50, and 0.52), Kc middle (1.02, 1.05, 1.13, and 1.10), and Kc end (0.73, 0.74, 0.74, and 0.75) for the Qassiem, Riyadh, Al-Jouf, and Eastern regions, respectively. Based on the amount of water used and the yield achieved, the highest WUE (3.6 kg m−3) was observed in the Riyadh region, while the lowest WUE (1.5 kg m−3) was observed in the Al-Jouf region.

scholarly journals EVAPOTRANSPIRAÇÃO E COEFICIENTES DE CULTURA DO MARACUJAZEIRO AMARELO CONDUZIDO SOB DUAS ORIENTAÇÕES DE PLANTIO

Irriga ◽  
2006 ◽  
Vol 11 (1) ◽  
pp. 90-106
Author(s):  
Tonny José Araújo da Silva ◽  
Marcos Vinícius Folegatti ◽  
Cláudio Ricardo da Silva ◽  
José Alves Júnior ◽  
Regina Célia de Matos Pires
Keyword(s):  
Vegetative Growth ◽  
Crop Coefficient ◽  
Sao Paulo ◽  
Passion Fruit ◽  
Crop Evapotranspiration ◽  
Passiflora Edulis ◽  
Fruit Crop ◽  
Passiflora Edulis Sims ◽  
Crop Coefficients ◽  
East West

EVAPOTRANSPIRAÇÃO E COEFICIENTES DE CULTURA DO MARACUJAZEIRO AMARELO CONDUZIDO SOB DUAS ORIENTAÇÕES DE PLANTIO  Tonny José Araújo da Silva; Marcos Vinícius Folegatti; Cláudio Ricardo da Silva; José Alves Júnior; Regina Célia de Matos PiresDepartamento de Engenharia Rural-Irrigação e Drenagem, Escola Superior de Agricultura “Luiz de Queiroz”, Universidade de São Paulo, Piracicaba, SP, [email protected]   1 RESUMO O Brasil é o maior produtor mundial de maracujá (Passiflora edulis Sims. var. flavicarpa Deg.), empregando no campo entre 100 a 250 dias homem ha-1 ano-1, sendo o terceiro suco mais produzido no Brasil. Nos cultivos irrigados de maracujazeiro obtêm-se as maiores produtividades, melhor qualidade de frutos e preço de mercado, porém, ainda são poucas as informações sobre evapotranspiração e coeficientes de cultivo necessários ao manejo de irrigação na cultura. Dessa maneira, objetivo deste estudo foi determinar a evapotranspiração (ETc) e o coeficiente de cultivo (Kc) do maracujazeiro amarelo, conduzido em espaldeira com orientação Norte-Sul e Leste-Oeste. Este trabalho foi conduzido no período de dezembro de 2003 a janeiro de 2005, em Piracicaba, SP. Mudas de maracujazeiro amarelo, com 83 dias de germinação, foram transplantadas para duas parcelas experimentais definidas pela direção da espaldeira. Para a estimativa do consumo de água pelas plantas, utilizaram-se 4 lisímetros de pesagem hidráulica. A ETc total aos 450 dias após o plantio (DAP) foi de 1171 mm e 1083 mm acumulados para as parcela Norte-Sul e Leste-Oeste, respectivamente. Os valores extremos de consumo foram em média 5 L planta-1 dia-1, durante o outono e inverno, e 8 L planta-1 dia-1, no Verão. Não houve diferença significativa para a ETc das parcelas nos meses de menor disponibilidade energética. Os coeficientes de cultivo obtidos foram: 0,6 para crescimento vegetativo apical, 0,9 para crescimento vegetativo lateral, 1,2 para floração e frutificação, 1,0 para maturação dos frutos e 0,8 para a fase pós-maturação dos frutos. UNITERMOS: Passiflora edulis, lisímetro de pesagem hidráulica, manejo de irrigação.  SILVA, T. J. A. da; FOLEGATTI, M. V.; SILVA, C. R. da; ALVES JÚNIOR, J.; PIRES, R. C. de M.; EVAPOTRANSPIRATION AND CROP COEFFICIENTS OF YELLOW PASSIONFRUIT TREES CULTIVATED IN TRELLIS UNDER TWO ORIENTATIONS  2 ABSTRACT Brazilis the largest producer of passion fruit (Passiflora edulis Sims. var. flavicarpa Deg.), using between 100 to 250 days manpower ha-1 year-1. Its juice is the third most produced one. Irrigation is an important practice for passion fruit crop providing higher productivity, better fruit quality and market price. However, information about crop evapotranspiration and crop coefficients for this crop is still not very known. Therefore, the objective of this work was to determine the passion fruit crop evapotranspiration (ETc) and crop coefficient (Kc) cultivated in trellis with North-South and East-West orientations. The experiment was carried out in Piracicaba, São Paulo State, Brazil, from December 2003 to January 2005. 83-day-old passion fruit seedlings (Passiflora edulis Sims f. flavicarpa Deg cv. IAC 275) were transplanted to the experimental area. 4 hydraulic weighing lysimeters were used in order to estimate the crop evapotranspiration. Total ETc at 450 days after transplant (DAP) for North-South orientation area was higher  (1.171 mm) than for East-West orientation (1,083 mm). No significant differences were found for ETc between orientations during the months with lower net radiation. Crop coefficient values were: 0.6 for apex vegetative growth, 0.9 for lateral vegetative growth, 1.2 for flowering and fruit development, 1.0 for fruit maturation and 0.8 for post-maturation period. KEYWORDS: Passiflora edulis, hydraulic weighing lysimeter, irrigation scheduling

scholarly journals Evapotranspiration, crop coefficient and water use efficiency of onion cultivated under different irrigation depths

2022 ◽  
Vol 26 (3) ◽  
pp. 219-225
Author(s):  
Wendy K. Matsunaga ◽  
Vicente de P. R. da Silva ◽  
Victória P. Amorim ◽  
Eliton S. G. Sales ◽  
Sílvia M. Dantas ◽  
...  
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Field Experiments ◽  
Crop Coefficient ◽  
Northeastern Brazil ◽  
Semiarid Region ◽  
Crop Evapotranspiration ◽  
Maturation Stages ◽  
Use Efficiency ◽  
Crop Coefficients

ABSTRACT This study aimed to determine crop evapotranspiration through the soil water balance, the crop coefficient and water use efficiency of the onion (Allium cepa L.) in a system with four irrigation regimes, cultivated in the semiarid region of northeastern Brazil. Two field experiments were carried out during the rainy and dry periods of the region in 2018, using the treatments of 100% (T1), 75% (T2), 50% (T3) and 25% (T4) of the reference evapotranspiration for daily water replacement and five replicates for each treatment. It was verified that crop evapotranspiration varies according to the water availability in the soil; however, the highest water use efficiency occurred for the T3 treatment. The T1 treatment obtained the highest estimated yield, 43.86 tons ha-1, while T4 obtained 13.47 tons ha-1, the lowest estimated yield among the treatments, and this difference was statistically significant (p ≤ 0.05) by F test. The crop coefficients obtained were 0.68, 0.89, 0.99 and 0.73 for the initial, vegetative, bulbing and maturation stages, respectively.

scholarly journals DETERMINAÇÃO DO COEFICIENTE DE CULTIVO PARA A CULTURA DO RABANETE ATRAVÉS DE LISIMETRIA DE DRENAGEM

Irriga ◽  
2018 ◽  
Vol 22 (1) ◽  
pp. 194-203 ◽  
Author(s):  
Elvis Da Silva Alves ◽  
Dayane Farias Lima ◽  
José Adeilson Santos Barreto ◽  
Daniella Pereira dos Santos ◽  
Márcio Aurélio Lins dos Santos
Keyword(s):  
Water Consumption ◽  
Irrigation Management ◽  
Crop Evapotranspiration ◽  
Local Conditions ◽  
Stage Of Development ◽  
Experimental Area ◽  
Crop Water Consumption ◽  
Crop Coefficients ◽  
The City ◽  
E Mail

DETERMINAÇÃO DO COEFICIENTE DE CULTIVO PARA A CULTURA DO RABANETE ATRAVÉS DE LISIMETRIA DE DRENAGEM  ELVIS DA SILVA ALVES1; DAYANE FARIAS LIMA2; JOSÉ ADEILSON SANTOS BARRETO3; DANIELLA PEREIRA DOS SANTOS4 E MÁRCIO AURÉLIO LINS DOS SANTOS5 [1] Eng. Agrônomo, Doutorando em Engenharia Agrícola UFV/Viçosa – MG, e-mail: [email protected] Eng. Agrônoma, Mestranda em Engenharia Agrícola UFRPE/Recife – PE, e-mail: [email protected] Eng. Agrônomo, UFAL/Campus Arapiraca – AL, e-mail: [email protected] Eng. Agrônoma, Doutoranda em Engenharia Agrícola UFRPE/Recife – PE, e-mail: [email protected] Eng. Agrônomo, Professor UFAL/Campus Arapiraca – AL, e-mail: [email protected]  1        RESUMO O coeficiente de cultivo (Kc) está diretamente ligado as características fenológicas e fisiológicas das culturas. O grande problema em manejar a irrigação pelo método em que o relaciona com a Evapotranspiração de referência (ET0) está na obtenção de valores de Kc que sejam condizentes com as condições da localidade do cultivo. Apesar dos lisímetros de pesagem serem mais confiáveis, lisímetros de drenagem quando bem manejados permitem a obtenção de resultados confiáveis da evapotranspiração da cultura (ETc), que em razão com a ET0 resulta no Kc. Com isso, este trabalho teve como objetivo monitorar o consumo hídrico da cultura do rabanete para determinação dos coeficientes de cultivo no município de Arapiraca – AL, utilizando lisimetria de drenagem. O trabalho foi conduzido na área experimental do Campus de Arapiraca da Universidade Federal de Alagoas, onde foram instalados três lisímetros de drenagem em uma área experimental com dimensões de 5,00 x 2,00 m de comprimento e largura, respectivamente. A ETc foi determinada pelo método do balanço hídrico, e a ET0 pelo método de Penman Monteith-FAO. O monitoramento do consumo de água da cultura do rabanete para as condições locais da cidade de Arapiraca pode ser realizado de forma confiável através da lisimetria de drenagem. Os coeficientes de cultivo (Kc) do rabanete para Arapiraca determinados através deste trabalho foram de 0,45; 0,55; 0,95 e 0,65, para os estádios I, II, III e IV respectivamente. O estádio de desenvolvimento responsável pelo maior consumo hídrico do rabanete foi estádio III, com consumo de 15 mm. A evapotranspiração da cultura do rabanete durante todo o ciclo foi de 39 mm. Palavras-chave: Manejo de irrigação, evapotranspiração, consumo hídrico.  ALVES. E. S.; LIMA, D. F.; BARRETO, J. A. S.; SANTOS, D. P.; SANTOS, M. A. L.DETERMINATION OF CULTIVATION COEFFICIENT TO RADISH CULTURE USING DRAINAGE LYSIMETRY     2      ABSTRACT The cultivation coefficient (Kc) is directly connected to phenological and physiological characteristics of cultures. The major problem in managing the irrigation method that relates it to ET0 is in getting Kc values that are consistent with the conditions of the location of cultivation. Though weighing lysimeters are more reliable, drainage lysimeters when well managed allow the obtention of reliable results of crop evapotranspiration (ETc), which, in ration with  ET0 results in Kc. Therefore, this study aimed to monitor the radish crop water consumption for determining crop coefficients in the city of Arapiraca - AL, using drainage lysimeters. The work was conducted in the experimental area of Arapiraca Campus of the Federal University of Alagoas, where three drainage lysimeters were installed in an experimental area with dimensions of 5.00 x 2.00 m in length and width, respectively. The ETc was determined by the water balance method, and the ET0 Penman Monteith-FAO. The monitoring of water consumption of the radish culture for the local conditions of Arapiraca can be carried out reliably through drainage lysimetry. Crop coefficients (Kc) of Radish for Arapiraca determined by this study were 0.45; 0.55; 0.95 and 0.65, for stages I, II, III and IV respectively. The stage of development responsible for higher water consumption by radish was stage III, with consumption of 15 mm. The radish crop evapotranspiration throughout the cycle was 39 mm. Keywords: Irrigation management, evapotranspiration, water consumption.

scholarly journals VARIAÇÃO SAZONAL NA EVAPOTRANSPIRAÇÃO DE PLANTAS JOVENS DE LIMA ÁCIDA ‘TAHITI’

Irriga ◽  
2006 ◽  
Vol 11 (1) ◽  
pp. 26-35 ◽  
Author(s):  
Cláudio Ricardo da Silva ◽  
José Alves Júnior ◽  
Tonny José Araújo da Silva ◽  
Marcos Vinícius Folegatti ◽  
Luis Fernando de Souza Magno Campeche
Keyword(s):  
Seasonal Variation ◽  
Seasonal Variations ◽  
Crop Coefficient ◽  
Soil Evaporation ◽  
Field Conditions ◽  
Water Requirements ◽  
Experimental Area ◽  
Acid Lime ◽  
Daily Evapotranspiration ◽  
Crop Coefficients

VARIAÇÃO SAZONAL NA EVAPOTRANSPIRAÇÃO DE PLANTAS JOVENS DE LIMA ÁCIDA ‘TAHITI’  Cláudio Ricardo da Silva1; José Alves Júnior1; Tonny José Araújo da Silva1; Marcos Vinícius Folegatti1; Luis Fernando de Souza Magno Campeche21Departamento de Engenharia Rural, Escola Superior de Agricultura Luiz de Queiróz,  Universidade de São Paulo,  Piracicaba-SP, [email protected] de Engenharia Agronômica,  Universidade Federal de Sergipe  1 RESUMO O objetivo deste trabalho foi estudar a variação sazonal diária e horária na evapotranspiração de plantas jovens de lima ácida ‘Tahiti’ sob condições de campo. O estudo foi conduzido em Piracicaba, durante o inverno de 2003 e verão de 2004. Utilizou-se um lisímetro de pesagem eletrônica de 2,7 mde diâmetro e 0,8 mde profundidade com uma planta de dois anos de idade, localizado no centro da área experimental com 322 plantas. Todas as plantas do pomar foram irrigadas por quatro gotejadores autocompensantes, inclusive a do lisímetro. Os resultados permitiram verificar que no período de verão a média da evapotranspiração da cultura (ETc) foi de 1,50 mm dia-1 decrescendo a 0,66 mm dia-1 nos meses de inverno. O coeficiente de cultivo (Kc) médio obtido foi de 0,36 e 0,22 durante o período de verão e inverno, respectivamente. A ETc máxima para o período de inverno ocorreu às 14:00 h enquanto que no verão foi às 12:00 h. Além disso, ocorreram perdas por evaporação diária noturna de 17,4 % e 13,4% da ETc para o período de inverno e verão respectivamente. A curva de evaporação do solo (Ke) foi semelhante em ambos os períodos estudados. UNITERMOS: citros, lisímetro, coeficiente de cultivo, demanda hídrica  SILVA, C. R. da; ALVES JÚNIOR, J.; SILVA, T. J. A. da; FOLEGATTI, M. V.; CAMPECHE, L. F. de S. M.; SEASONAL VARIATION IN EVAPOTRANSPIRATION OF YOUNG ‘TAHITI’ACID LIME TREES  2 ABSTRACT             The objective of this study was to investigate seasonal variations in hourly and daily evapotranspiration (ETc) of acid lime ‘Tahiti’ trees under field conditions, defining values of crop coefficients. The study was carried out in Piracicaba, Brazil, during the winter of 2003 and the summer of 2004. Aweighing lysimeter of 2.7 mdiameter and 0.8 mdepth was planted with a two-year-old tree that was located at the center of an experimental area with 322 trees. The lysimeter tree was irrigated, like others in the plot, by four pressure compensated emitters. The average ETc was 1.50 mmday-1 in the summer and dropped to 0.66 mm day-1 in winter months. The average seasonal crop coefficient (Kc) was 0.36 and 0.22 for summer and winter, respectively. The maximum Etc time was at noon in the summer and at 2 pm in the winter. Moreover, night soil evaporation represented 17.4% and 13.4% of daily ETc in winter and summer. The soil evaporation curve  (Ke) in both seasons showed similar results.  KEYWORDS: citrus, lysimeter, crop coefficient, water requirements

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