scholarly journals EVAPOTRANSPIRAÇÃO E COEFICIENTE DE CULTIVO DO FEIJÃO-CAUPI NO VALE DO GURGUÉIA, PIAUÍ

Irriga ◽  
2008 ◽  
Vol 13 (2) ◽  
pp. 182-190 ◽  
Author(s):  
Edson Alves Bastos ◽  
Valber Mendes Ferreira ◽  
Cláudio Ricardo da Silva ◽  
Aderson Soares de Andrade Júnior
Keyword(s):  
Vigna Unguiculata ◽  
Water Demand ◽  
Irrigation Management ◽  
Crop Coefficient ◽  
Development Stage ◽  
Climatic Data ◽  
Initial Stage ◽  
Crop Development ◽  
Culture Cycle ◽  
Weighing Lysimeter

EVAPOTRANSPIRAÇÃO E COEFICIENTE DE CULTIVO DO FEIJÃO-CAUPI NO VALE DO GURGUÉIA, PIAUÍ  Edson Alves Bastos1;Valber Mendes Ferreira2; Cláudio Ricardo da Silva2; Aderson Soares de Andrade Júnior11 Embrapa Meio-Norte, [email protected] Universidade Federal do Piauí  1 RESUMO A determinação dos valores do coeficiente de cultivo (Kc), durante o ciclo de desenvolvimento, é fundamental para se obter as necessidades hídricas de uma cultura. O presente trabalho teve por objetivo determinar a evapotranspiração e o Kc do feijão-caupi (Vigna unguiculata L. Walp.), variedade BR-17 Gurguéia, durante os diferentes estádios de desenvolvimento, utilizando um lisímetro de pesagem eletrônico. O experimento foi conduzido no município de Alvorada do Gurguéia, localizado no Vale do Gurguéia, PI, durante o período de agosto a outubro de 2005. A evapotranspiração de referência foi estimada pelo método de Penman-Monteith com base nos dados meteorológicos obtidos por uma estação agrometeorológica automática. Os resultados mostraram que a ETc foi de 288,5 mm para todo o ciclo da cultura, correspondente a um valor médio de 4,1 mm dia-1. O estádio fenológico de maior demanda hídrica foi o reprodutivo, com 5,4 mm dia-1 e os valores de Kc foram de: 0,8, no estádio inicial;0,8 a 1,1, no estádio de crescimento;1,1 a 1,4 no estádio reprodutivo e de1,4 a 0,3 no estádio final. UNITERMOS: Lisímetro de pesagem, manejo de irrigação, consumo hídrico, Kc, Vigna unguiculata.  BASTOS, E.B.; FERREIRA, V.M.; SILVA, C. R. da; ANDRADE JÚNIOR, A.S. de. COWPEA EVAPOTRANSPIRATION AND CROP COEFFICIENT  IN THEGURGUEIAVALLEY,PIAUI STATE,BRAZIL  2 ABSTRACT The determination of crop coefficient (Kc) values is essential to obtain crop water demand throughout its development stage. The present work aimed to determine cowpea (Vigna unguiculata L. Walp. BR-17 Gurgueia variety) crop evapotranspiration (ETc) and Kc values during the crop development, using an electronic weighing lysimeter. The experiment was carried out in Alvorada do Gurgueia, located in theGurgueiaValley. The reference evapotranspiration (ETo) was estimated by Penman-Monteith method with climatic data obtained from an automatic weather station installed in the area. The results showed that the ETc was288.5 mm for the entire culture cycle, corresponding to4.1 mm day ˉ¹. The highest water demand occurred at the reproductive phonological stage (an average of5.4 mm day ˉ¹). Kc values were: 0.8 at the initial stage, 0.8 to 1.1 at the crop development stage, 1.1 to 1.4 at the reproductive stage and 1.4 to 0.3 at the end of the cycle.KEY WORDS: weighing lysimeter, irrigation management, water consumption, Kc, Vigna unguiculata.

scholarly journals Evapotranspiration and crop coefficient of drip irrigated watermelon in Piaui coastline, Brazil

2012 ◽  
Vol 32 (3) ◽  
pp. 582-590 ◽  
Author(s):  
Edson A. Bastos ◽  
Cláudio R. Silva ◽  
Braz H. N. Rodrigues ◽  
Aderson S. Andrade Jr. ◽  
Lívia M. M. Ibiapina
Keyword(s):  
Citrullus Lanatus ◽  
Crop Coefficient ◽  
Intermediate Stage ◽  
Development Stage ◽  
Climatic Data ◽  
Mean Values ◽  
Initial Stage ◽  
Crop Development ◽  
Crop Cycle ◽  
Electronic Sensors

The knowledge of the evapotranspiration (ETc) and crop coefficient (Kc) is fundamental to plan and to manage the irrigation of any crop. The aim of this study was to determine the daily and hourly evapotranspiration of drip irrigated watermelon (Citrullus Lanatus, var. Crimson Sweet) and crop coefficient (Kc) in each crop development phase. The experiment was carried out in an experimental area of 1.27 ha of Embrapa Mid-North, localized in Parnaíba (02°54'S, 41°47'W and 46 m above of sea), State of Piauí, Brazil, from September to November, 2006. Electronic weighing lysimeters of 1.5 m x 1.5 m wide and long and 1.0 m deep were used to obtain the evapotranspiration. The plants were drip irrigated with a lateral row per plant row and drippers spaced 0.5 m from each other. The reference evapotranspiration (ETo) was estimated using the Penman-Monteith equation from the climatic data obtained by electronic sensors. The total evapotranspiration during the watermelon crop cycle cultivated in the state of Piauí was 233.87 mm, with mean values of 3.7 mm day-1, minimum of 1.18 and maximum of 8.14 mm day-1. The Kc of the drip irrigated watermelon was 0.18 in the initial stage of crop growth; 0.18 to 1.3, in crop development stage; 1.3 in the intermediate stage and 0.43 in the final stage.

scholarly journals Determination of evapotranspiration and crop coefficient for cauliflower at Paranánorthwest region

2021 ◽  
Vol 17 (5) ◽  
pp. 79-86
Author(s):  
André Felipe Barion Alves Andrean ◽  
Roberto Rezende ◽  
Vinícius Villa e Vila ◽  
Lucas Henrique Maldonado da Silva ◽  
Gustavo Soares Wenneck
Keyword(s):  
Water Consumption ◽  
Irrigation Management ◽  
Crop Coefficient ◽  
Intermediate Stage ◽  
State University ◽  
Local Data ◽  
Local Conditions ◽  
Essential Information ◽  
Initial Stage ◽  
Northwestern Region

Evapotranspiration and the estimation of crop coefficient (Kc) are essential information for irrigation management, contributing to increase the water use efficiency and optimizing resources, mainly using local data. This study aimed to determine the water consumption and the crop coefficient of cauliflower (Barcelona hybrid) in the northwestern region of Paraná. The experiment was conducted in a greenhouse at the Technical Irrigation Center belonging to the State University of Maringá, in Maringá - PR. The crop evapotranspiration was determined using constant water table lysimeters, and the reference evapotranspiration was estimated by the Penman-Monteith method (FAO), using climatological data collected in an automatic meteorological station. The cultivation was carried out from April to July. The total water consumption by the cauliflower was 215.11 mm, a higher value than that available in the FAO recommendations. The crop coefficient (Kc) recommended values for local conditions are 0.74 for the initial stage, 1.86 for the intermediate stage, and 1.50 for the final stage.

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

Evaluation of canopy transpiration rate by applying a plant hormone “abscisic acid”

Biologia ◽  
2006 ◽  
Vol 61 (19) ◽  
Author(s):  
Daisuke Yasutake ◽  
Masaharu Kitano ◽  
Tetsuo Kobayashi ◽  
Kota Hidaka ◽  
Takahiro Wajima ◽  
...  
Keyword(s):  
Abscisic Acid ◽  
Water Stress ◽  
Stomatal Conductance ◽  
Transpiration Rate ◽  
Plant Hormone ◽  
Development Stage ◽  
Canopy Transpiration ◽  
Initial Stage ◽  
Crop Development ◽  
Corn Canopy

AbstractA method for evaluation of temporal changes in canopy transpiration rate and stomatal conductance in crop fields by using a plant hormone abscisic acid (ABA) has recently been developed. The method was applied to a corn canopy at different growth stages in the upper Yellow River basin, China. Diurnal changes in the canopy transpiration rate and stomatal conductance were evaluated at the initial stage with a leaf area index (LAI) of 0.37 on June 7 and the crop development stage with an LAI of 4.39 on July 15, 2005. The proportions of the accumulated transpiration rate during daytime to the accumulated evapotranspiration were 24% and 74% at the initial and crop development stages, respectively. Stomatal conductance varied in parallel with transpiration rate in the initial stage of the crop. However, in the crop development stage with low soil water content, stomatal conductance reached the maximum value at 10:00 a.m. and thereafter decreased rapidly at around noon with high evaporative demand to corn canopy. This shows the midday stomatal closure was caused by excessive water stress to corn canopy in the crop development stage. Thus, the proposed method with ABA application is useful for evaluation of temporal changes in transpiration rate and stomatal conductance, and hence, can detect the plant water stress.

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 Evapotranspiração e coeficiente de cultura da melancia na microrregião de Teresina, PI, Brasil

2015 ◽  
Vol 6 (4) ◽  
pp. 488
Author(s):  
Valber Mendes Ferreira ◽  
Antonio Evaldo Klar ◽  
Aderson Soares Andrade Júnior ◽  
Edson Alves Bastos ◽  
Simone Raquel Mendes Oliveira
Keyword(s):  
Water Demand ◽  
Meteorological Data ◽  
Crop Coefficient ◽  
Soil Water Balance ◽  
Initial Growth ◽  
Phenological Stage ◽  
Water Requirements ◽  
Development Cycle ◽  
Crop Development

The determination of crop coefficient (Kc) values during the crop development cycle is essential to obtain the water requirements for the culture. The present study aimed to determine the evapotraspiration and Kc on Shadow, Top Gun and Crimson Sweet watermelon cultivars, during different stages of development using the method of soil water balance. The experiment was conducted at Embrapa Meio Norte in Teresina, PI, experimental field, from August to October, 2010. The evapotranspiration reference was estimated by Penman-Monteith, based on meteorological data obtained by an automatic weather station. According to the results, the ETc was 224.4 mm, corresponding to an average of 3.8 mm day-1. The higher water demand was 5.5 mm day-1, obtained at the intermediate phenological stage. The Kc values were 0.39, 0.80, 1.14, 0.59 (Crimson Sweet), 0.35, 0.72, 1.20, 0.30 (Top gun) and 0.34, 0.58, 0.89, 0.55 (Shadow), for initial, growth, intermediate and final phases, respectively.

scholarly journals A Tool to Measure Maturity of an Employee Suggestion Scheme

2015 ◽  
Vol 6 (2) ◽  
pp. 4-13 ◽  
Author(s):  
Flevy Lasrado ◽  
Boštjan Gomišček
Keyword(s):  
Building Blocks ◽  
Development Stage ◽  
Evaluation Tool ◽  
Maturity Level ◽  
Initial Stage ◽  
Long Time ◽  
Innovation Capacity ◽  
Grading Scale ◽  
Creativity And Innovation ◽  
System Effectiveness

Abstract Employee Suggestion Schemes have been used in organizations for a long time due to the fact that they enable fostering of creative ability of employees. However, they must be used effectively and in a sustainable manner to better the creativity and innovation capacity of organizations in order to improve competitive advantage. Therefore there is a need to understand the maturity of Employee Suggestion Schemes. This paper proposes a new, structured evaluation tool for assessing an organizational Employee Suggestion Scheme maturity. It suggests five building blocks: Leadership and Work Environment, System Capability, System Effectiveness, Organizational Encouragement and System Barriers, each of them characterized by several relevant indicators and an assessment/grading scale in order for an organization to be able to determine the maturity level of their Employee Suggestion Scheme as: Initial stage, Development stage or Advanced stage. Organizations should apply this tool to assess the maturity level of their Employee Suggestion Scheme and draw a roadmap for its improvements.

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). 

scholarly journals INFLUÊNCIA DA COBERTURA MORTA NA EVAPOTRANSPIRAÇÃO, COEFICIENTE DE CULTIVO E EFICIÊNCIA DE USO DE ÁGUA DO MILHO CULTIVADO EM CERRADO

Irriga ◽  
2018 ◽  
Vol 21 (2) ◽  
pp. 352
Author(s):  
HIPÓLITO MURGA-ORRILLO ◽  
WELLINGTON FARIAS ARAUJO ◽  
CARLOS ABANTO RODRIGUEZ ◽  
RICARDO MANUEL BARDALES LOZANO ◽  
ROBERTO TADASHI SAKAZAKI ◽  
...  
Keyword(s):  
Zea Mays ◽  
Water Use Efficiency ◽  
Water Use ◽  
Water Consumption ◽  
Irrigation Management ◽  
Crop Coefficient ◽  
Ground Cover ◽  
Bare Soil ◽  
Crop Cycle ◽  
Use Efficiency

INFLUÊNCIA DA COBERTURA MORTA NA EVAPOTRANSPIRAÇÃO, COEFICIENTE DE CULTIVO E EFICIÊNCIA DE USO DE ÁGUA DO MILHO CULTIVADO EM CERRADO HIPÓLITO MURGA-ORRILLO1; WELLINGTON FARIAS ARAÚJO2; CARLOS ABANTO-RODRIGUEZ3; ROBERTO TADASHI SAKAZAKI4; RICARDO MANUEL BARDALES-LOZANO5 E ANA ROSA POLO-VARGAS6 1Engenheiro Agrônomo, Prof. Auxiliar, Universidad Nacional Autónoma de Chota, (UNACH), Jr. Gregorio Malca Nº 875- Campus Colpa Matara, Chota, Perú. [email protected] Agrônomo, Prof. Dr. Associado da UFRR/CCA, Boa Vista, RR. [email protected] Florestal, Investigador no Instituto de Investigaciones de la Amazonía Peruana, Carretera Federico Basadre, Km 12,400, Yarinacocha, Ucayali, Perú. [email protected] Agrônomo, Doutorando na UFRR/CCA, Boa Vista, RR. [email protected] Agrônomo, Doutorando na UFRR/Bionorte, Boa Vista, RR. [email protected] Agrônoma, Graduada na Universidad Nacional de Cajamarca, (UNC), Av. Atahualpa Nº 1050- Carretera Cajamarca-Baños del Inca, Cajamarca, Perú. [email protected]  1 RESUMOA irrigação consome grande quantidade de água, sendo importante um adequado manejo da cultura para minimizar esse consumo, maximizando a produção. No intuito de obter informações para o manejo da irrigação, objetivou-se com o presente trabalho determinar a evapotranspiração da cultura (ETc), o coeficiente de cultivo (Kc) e a eficiência do uso de água (EUAg) da cultura de milho, em solo com e sem cobertura, durante os diferentes estádios de desenvolvimento, utilizando lisímetros de drenagem. O experimento foi conduzido no campus Cauamé da Universidade Federal de Roraima, entre 19/04/2014 e 07/08/2014, em Boa Vista, RR. A evapotranspiração de referência (ETo) foi estimada pelo método de Penman-Monteith FAO. Os resultados da ETc do milho, durante o ciclo da cultura, em solo sem e com cobertura foram de 421,5 e 351,0 mm, respectivamente. As médias diárias de ETc foram de 4,1 mm dia-1 para solo sem cobertura e 3,4 mm dia-1 para solo com cobertura. A cobertura do solo propiciou valores diferentes de Kc's para o milho, nos mesmos estádios, em comparação aos Kc’s do solo descoberto. Para o solo descoberto, os Kc’s observados para os estádios fenológicos I, II, III, e IV, foram de 0,40; 0,84; 1,59 e 0,81, respectivamente. Já para solo com cobertura, os Kc’s pelos mesmos estádios em menção foram 0,28; 0,64; 1,49 e 0,48, respectivamente. A EUAg para solo com cobertura foi 1,77 kg m-3 e para solo sem cobertura foi 1,65 kg m-3. Estes resultados mostram que a cobertura morta no solo influenciou no consumo hídrico do milho durante todo seu ciclo. Palavras-chave: Zea mays. Irrigação. Solo coberto. Consumo hídrico.  MURGA-ORRILLO, H.; ARAÚJO, W. F.; ABANTO-RODRIGUEZ C.; SAKAZAKI, R. T.; BARDALES-LOZANO R. M.; POLO-VARGAS, A. R.MULCH INFLUENCE ON EVAPOTRANSPIRATION, CROP COEFFICIENT AND WATER USE EFFICIENCY OF CORN GROWN IN THE SAVANNAH   2 ABSTRACTIrrigation consumes large amounts of water, and minimizing consumption and maximizing the production are  important to a proper crop management . In order to obtain information for irrigation management, the aim of the present study was to determine evapotranspiration (ETc),  crop coefficient (Kc) and  water use efficiency (WUE) of maize grown in soil with and without cover, during the various stages of development, using drainage lysimeters. The experiment was conducted in Cauamé campus of the Federal University of Roraima, from 19/04/2014 to 08/07/2014, in Boa Vista, RR. The reference evapotranspiration (ETo) was estimated by the Penman-Monteith method. The results of the corn ETc during the crop cycle in soil with and without coverage were 421.5 and 351.0 mm, respectively. The daily average of ETc were 4.1 mm day-1 for bare soil and 3.4 mm day-1 for soil with cover. The ground cover led to different values of Kc's for corn in the same stages as compared to Kc's from the bare ground. For bare soil, the Kc's observed for the phenological stages I, II, III, and IV were 0.40; 0.84; 1.59 and 0.81, respectively. As for covered soil, the Kc's in the same stadiums mentioned were 0.28; 0.64; 1.49 and 0.48, respectively. The WUE to soil with cover was 1.77 kg m-3 and ground without cover was 1.65 kg m-3. These results show that  soil mulching influenceS maize water consumption throughout its cycle. Keywords: Zea mays. Irrigation. Ground covered. Water consumption.

scholarly journals IRRIGATION FREQUENCIES FOR Eucalyptus grandis SEEDLINGS

2020 ◽  
Vol 28 ◽  
pp. 364-374
Author(s):  
Gustavo Henrique Miguel da Cruz ◽  
Fernando França da Cunha ◽  
Epitácio José de Souza ◽  
Andrisley Joaquim da Silva ◽  
Roberto Filgueiras
Keyword(s):  
Seed Quality ◽  
Block Design ◽  
Irrigation Management ◽  
Eucalyptus Grandis ◽  
Volume Ratio ◽  
Crop Coefficient ◽  
Experimental Period ◽  
Dry Mass ◽  
Irrigation Depth ◽  
Total Seed

One of the bottlenecks in relation to the production of forest seedlings is irrigation, especially in less-tech nurseries. The small volumes of substrate, where the seedlings develop, lead to low water storage. This fact can lead to water deficit and significant losses in the production of seedlings, generating even mortality. The objective of this study was to determine the best irrigation frequencies for Eucalyptus grandis seedling production in less-tech nurseries. The experiment was conducted between 2013/08/04 and 2013/23/07 (106 days) and conducted in Chapadão do Sul county, Brazil. The experiment was set up in a randomized complete block design, with five replications. Four irrigation frequencies were tested: IF1 (one daily irrigation - 11:00 a.m.), IF2 (two daily irrigations - 11:00 a.m. and 7:00 p.m.), IF3 (three daily irrigations - 07:00 a.m., 11:00 a.m. and 7:00 p.m.) and IF4 (four daily irrigations - 07:00 a.m., 11:00 a.m., 3:00 p.m. and 7:00 p.m.). The sample units were composed of eight seedlings in 50 cm3 conical tubes filled with soil and vermiculite in a volume ratio of 1:1. The irrigation depth was estimated by reference evapotranspiration (Penman-Monteith) multiplied by a crop coefficient equal to two. Plant height, number of definitive leaves, shoot dry mass (root and total), seed quality index, survival and efficiency of water use by eucalyptus seedlings were evaluated. The average daily irrigation depth in the experimental period was 5.2 mm. Based on the results, it is recommended for eucalyptus seedling producers, in less-tech nursery, irrigation management twice per days. (11:00 a.m. and 7:00 p.m.).

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