scholarly journals TENSÃO DE ÁGUA NO SOLO PARA O REINÍCIO DA IRRIGAÇÃO DE MILHO VERDE NO SEMIÁRIDO

2018 ◽  
Vol 17 (2) ◽  
pp. 190
Author(s):  
IGNACIO ASPIAZÚ ◽  
FERNANDO GOMES DA SILVA ◽  
RENATO MENDES OLIVEIRA ◽  
KAREN MARCELLE DE JESUS SILVA ◽  
SILVÂNIO RODRIGUES DOS SANTOS ◽  
...  
Keyword(s):  
Zea Mays ◽  
Soil Water ◽  
Zea Mays L ◽  
Irrigation Management ◽  
Winter Season ◽  
Dry Mass ◽  
Area Index ◽  
Soil Water Tension ◽  
Yield Parameters ◽  
Water Tension

  RESUMO O objetivo deste trabalho foi determinar em campo a tensão de água do solo adequada para o reinício da irrigação do milho verde no semiárido. O experimento constou de seis valores de tensão matricial da água do solo (20 kPa, 40 kPa, 60 kPa, 80 kPa, 100 kPa e 120 kPa) testadas em uma cultivar de milho, o hibrido duplo AG 1051. O experimento foi instalado no período de inverno de 2013, nos meses de agosto a novembro, num delineamento experimental de blocos casualizados (DBC), com quatro repetições, conduzidos na fazenda experimental da Embrapa Milho e Sorgo em Nova Porteirinha, MG. Foram avaliadas as variáveis: produtividade de espigas sem palha (t ha-1), número de espigas totais e comerciais por hectare, comprimento de espigas com palha e sem palha e diâmetro de espigas comerciais. Dentre os resultados pode-se constatar que os maiores valores para as variáveis de morfologia e de produtividade foram obtidos quando a irrigação foi efetuada com tensão próxima de 50 kPa, tornando-a a tensão mais adequada para o uso racional da água no manejo da irrigação do milho verde.Palavras-chave: Zea mays L., déficit hídrico, manejo da irrigação, resistência elétrica. SOIL WATER TENSION FOR REWATERING GREEN CORN IN THE SEMIARID  ABSTRACT _ The objective of this work was to determine the adequate water tension for rewatering green corn at field conditions in the semiarid. The experiment consisted of six values of matric soil water tension (20 kPa, 40 kPa, 60 kPa, 80 kPa, 100 kPa and 120 kPa) and one maize cultivar, the double hybrid AG1051. The experiment was installed in the 2013 winter season, from August to November, in a randomized blocks design (DBC), with four replicates, and conducted at the experimental farm belonging to Embrapa Maize and Sorghum in Nova Porteirinha, MG. Morphological parameters were evaluated such as plant height, leaf area index and dry mass, and also the yield parameters such as weight of spikes with straw and without straw (t ha-1), number of total and commercial spikes per hectare, diameter of commercial spikes and length of commercial spikes with and without straw. The highest values for the morphology and productivity variables were obtained when irrigation was carried out with a tension close to 50 kPa, which proved to be the most suitable tension for the rational use of water in the irrigation management of green corn.Keywords: Zea mays L., water deficit, irrigation management, electrical resistance.

scholarly journals Determination of soil water tension for irrigation management of sweet sorghum

2016 ◽  
Vol 37 (3) ◽  
pp. 1189
Author(s):  
Karen Marcelle de Jesus Silva ◽  
Ignacio Aspiazú ◽  
Arley Fiqueiredo Portugal ◽  
Renato Mendes de Oliveira ◽  
Polyanna Mara de Oliveira ◽  
...  
Keyword(s):  
Soil Water ◽  
Sweet Sorghum ◽  
Block Design ◽  
Irrigation Management ◽  
Soluble Solids ◽  
Water Retention Curve ◽  
Soil Water Retention Curve ◽  
Soil Water Retention ◽  
Soil Water Tension ◽  
Water Tension

Culturing of sweet sorghum is being considered as an excellent option for ethanol production, from an agronomical and industrial point of view. At present, information regarding the best soil water tension for beginning sweet sorghum irrigation is not available; hence, this study aimed to determine the adequate soil water tension under field conditions for beginning irrigation of four cultivars of sorghum. Two experiments were conducted at Nova Porteirinha, MG, in a randomized block design with sub-subdivided plots having four replications. Each experiment comprised six treatments of soil water tension (plots)-20, 40, 60, 80, 100, and 120 kPa-for resuming sweet sorghum irrigation, and four sweet sorghum cultivars (subplots)-BRS 508, BRS 509, BRS 511, and CMSXS647. After planting, the soil water level in the plots was elevated to field capacity (10 kPa), and then the treatments were applied. During treatment application, irrigation was resumed when the soil water tension reached the limit established in order to elevate the soil water tension to 10 kPa. The amount of water replaced during each irrigation was determined by generating a soil water retention curve for the experimental area. The following parameters were evaluated: green mass production, juice volume, soluble solids (Brix), and tons of Brix per hectare (TBH). The different soil water tensions and cultivars, agricultural year, and interaction between tension and year significantly affected (p ? 0.05) the characteristics evaluated, according to the F test. The agronomical characteristics of the evaluated cultivars showed linear relationship with water supply in the soil. According to TBH, irrigation of sweet sorghum needs to be performed when the soil tension reaches 20 kPa. The TBH values did not differ significantly among the four cultivars at the 5% significance level according to Tukey test.

scholarly journals CRESCIMENTO E PRODUTIVIDADE DA CULTURA DO MILHO (Zea mays L.) SUBMETIDO A VÁRIOS INTERVALOS DE IRRIGAÇÃO, NA REGIÃO DA PRÉ-AMAZÔNIA

Irriga ◽  
2006 ◽  
Vol 11 (2) ◽  
pp. 169-177 ◽  
Author(s):  
Emanoel Gomes de Moura ◽  
Ana Paula Rosa Teixeira ◽  
Valdirene Do Socorro Ribeiro ◽  
Alana Das Chagas Ferreira Aguiar ◽  
Maryzélia Furtado de Farias
Keyword(s):  
Zea Mays ◽  
Soil Water ◽  
Zea Mays L ◽  
Characteristic Curve ◽  
Soil Water Potential ◽  
Reproductive Capacity ◽  
Critical Threshold ◽  
Area Index ◽  
Efficient Treatment ◽  
Maize Growth

CRESCIMENTO E PRODUTIVIDADE DA CULTURA DO MILHO (Zea mays L.) SUBMETIDO A VÁRIOS INTERVALOS DE IRRIGAÇÃO, NA REGIÃO DA PRÉ-AMAZÔNIA  Emanoel Gomes de Moura; Ana Paula Rosa Teixeira; Valdirene do Socorro Ribeiro; Alana das Chagas Ferreira Aguiar; Maryzélia Furtado de FariasPrograma de Pós-Graduação  em Agroecologia, Universidade Estadual do Maranhão, São Luís, MA,  [email protected]   1 RESUMO Com o objetivo de avaliar o efeito da variação do intervalo entre irrigações no crescimento e produtividade da cultura do milho, foi conduzido este experimento em um ARGISSOLO da Pré-Amazônia, com freqüências de 6, 8, 10, 12 e 14 dias, em parcelas de 12 x 3,20m. Durante a fase de crescimento foram avaliadas, semanalmente, a área foliar, e a matéria seca e estimadas a taxa de assimilação líquida, taxa de crescimento e o índice de área foliar. Na colheita foram determinados o peso de 100 grãos, o peso das espigas, o número de grãos por espiga e peso de grãos. Antes de cada irrigação foi avaliada a umidade do solo por gravimetria e com base na curva característica foi estabelecido o limite de -500kPa como sendo o potencial de água em que a evapotranspiração relativa atinge o nível crítico na região do experimento.Concluiu-se que um moderado déficit de água no solo diminuiu a taxa de crescimento da parte aérea, sem prejudicar, no entanto, a capacidade reprodutiva. A maior eficiência do uso da água foi obtida com o tratamento irrigado com a freqüência de 10 dias, por ter produzido espigas 80% mais pesadas e um aumento na produção econômica em 72% quando comparado, aos demais tratamentos. UNITERMOS: milho, crescimento, produtividade, irrigação.  MOURA, E.G.DE; TEIXEIRA, A.P.R.; RIBEIRO, V. DO S.; AGUIAR, A. DAS C. F.; FARIAS, M.F. GROWTH AND PRODUCTIVITY OF MAIZE (Zea mays L.) SUBMITTED TO SEVERAL IRRIGATION INTERVALS IN THE PRE-AMAZON AREA  2 ABSTRACT This study evaluates the effect of different irrigation intervals on maize growth and productivity on an Argisol in the southeastern periphery of the Amazon. The experiment consisted of five treatments with irrigation frequencies of 6, 8, 10, 12 and 14 days, each treatment was replicated in five 12 x 3.2m plots. During the growth phase, foliar area and dry matter were measured on a weekly basis for estimation of NAR, growth rate and leaf area index; at harvesting the weight of 100 grains, ear weight, number of grains per ear and grain biomass were determined. Preceding each irrigation, soil humidity was gravimetrically measured and, based on characteristic curve moisture, a critical threshold of -500kPa soil water potential, below which relative evapotranspiration becomes critical in the study area, was established. Irrigation frequency of every 10 days turned out to be the most efficient treatment, because it produced ear that were 50% heavier and increased productivity up to 72% when compared to the other treatments.  It was concluded that moderate soil water deficit reduces shoot growth rates, but does not affect the plant reproductive capacity. KEYWORDS: maize, growth, productivity, irrigation. 

scholarly journals Effect of soil-water tension on herbaceous cotton yield

1999 ◽  
Vol 34 (10) ◽  
pp. 1905-1911 ◽  
Author(s):  
Francisco Assis de Oliveira ◽  
Tarcísio Gomes da Silva Campos ◽  
Bernardete Campos Oliveira
Keyword(s):  
Experimental Design ◽  
Field Experiment ◽  
Soil Water ◽  
Upland Cotton ◽  
Alluvial Soil ◽  
Cotton Yield ◽  
Soil Water Depletion ◽  
Area Index ◽  
Soil Water Tension ◽  
Water Tension

A field experiment was conducted during two years, 1990/91, in an alluvial soil, in the State of Paraíba, Brazil, to study the effect of the levels of soil-water tension, 50, 100, 200, 300, 400 and 600 kPa, at 20 cm depth, on upland cotton (Gossypium hirsutum L.r. latifolium Hutch, cv. CNPA-6H) yield. The experimental design was a complete randomized block with six treatments and four repetitions. There was an effect of the treatments on plant height, leaf area index and cotton yield, but the precocity index was not modified. Water should be applied when the soil-water tension, measured at 20 cm depth, reaches values around 200 kPa. There was a quadratic (R² = 0.893**) response of cotton yields to soil water tension, with the maximum when water was applied at 52% of soil water depletion.

scholarly journals EFEITO DE DIFERENTES ESTRATÉGIAS DE IRRIGAÇÃO SUPLEMENTAR SOBRE A PRODUÇÃO DE GRÃOS E SEUS COMPONENTES NA CULTURA DO MILHO

Irriga ◽  
2009 ◽  
Vol 14 (3) ◽  
pp. 254-267 ◽  
Author(s):  
Ana Rita Costenaro Parizi ◽  
Adroaldo Dias Robaina ◽  
Ana Carla Dos Santos Gomes ◽  
Fatima Cibele Soares ◽  
Cleiton José Ramão ◽  
...  
Keyword(s):  
Zea Mays ◽  
Zea Mays L ◽  
Irrigation Management ◽  
Dry Mass ◽  
Grain Production ◽  
Supplemental Irrigation ◽  
Medium Mass ◽  
Culture Cycle ◽  
And Control ◽  
Santa Maria

EFEITO DE DIFERENTES ESTRATÉGIAS DE IRRIGAÇÃO SUPLEMENTAR SOBRE A PRODUÇÃO DE GRÃOS E SEUS COMPONENTES NA CULTURA DO MILHO  Ana Rita Costenaro Parizi1; Adroaldo Dias Robaina2; Ana Carla dos Santos Gomes1; Fátima Cibele Soares1; Cleiton José Ramão3; Marcia Xavier Peiter2; Leonardo Calegaro41Universidade Federal de Santa Maria, Santa Maria, RS, [email protected] de Engenharia Rural, Universidade Federal de Santa Maria, Santa Maria, RS 3Universidade Federal do Pampa, Itaqui, RS 4Departamento de Ciências Agrárias, Universidade Regional Integrada do Alto Uruguai e das Missões, URI Santiago, Santiago, RS   1 RESUMO O objetivo deste trabalho foi avaliar os efeitos da aplicação de quatro estratégias de irrigação sobre a produção de grãos e componentes da cultura do milho na região de Santiago, RS. Utilizou-se o delineamento experimental inteiramente casualizado, tendo cinco tratamentos e quatro repetições que constituíram de diferentes estratégias de irrigação 60%, 80%, 100%, 120% da evapotranspiração de referência (ETo), e uma testemunha 0% da ETo. No final do ciclo da cultura realizaram-se as determinações dos componentes de produção de grãos e da matéria seca total. O número de espigas.planta-1 apresentou média de 1,0, o número de grãos.espiga-1 375,04 e a massa média do grão 0,30 g. A massa seca dos grãos.planta-1, massa seca das folhas.planta-1, massa seca do sabugo.planta-1 e massa seca total apresentaram valores máximos para o tratamento de 100% da Eto. A maior produção de grãos verificada e maior eficiência de uso da água foram obtidas no tratamento de 100% da Eto, sendo que a menor produção ocorreu no tratamento de 0% da Eto. O uso da irrigação suplementar na cultura do milho aumentou a produtividade de grãos para as condições, características do período e fatores considerados. UNITERMOS: Zea mays L., manejo de irrigação, produção de grãos  PARIZI, A. R. C.; ROBAINA, A. D.; GOMES, A. C. dos S.; SOARES, F.C.; RAMÃO, C. J.; PEITER, M. X.; CALEGARO, L. EFFECT OF DIFFERENT SUPPLEMENTAL IRRIGATION STRATEGIES ON GRAIN PRODUCTION AND THEIR COMPONENTS IN CORN CULTURE   2 ABSTRACT The aim of this work was to evaluate the effects of four irrigation application strategies on grain production and their components in corn culture in Santiago, RS. The experimental design was entirely randomized with five replications and four treatments that consisted of different strategies of irrigation 60%, 80%, 100%, 120% of the reference evapotranspiration (ETo), and control 0% of ETo. At the end of culture cycle grain production components and total dry matter were determined. The number of corn ear.plant-1 presented average of 1.0; the number of grains.corn ear-1 was 375.04 and the medium mass of grain 0.30g. The dry mass of grains.plant-1, dry mass of leaves.plant-1, dry mass corn cobs.plant-1 and its total dry mass presented maximum values for treatment 100% of Eto. The largest production of grains verified and larger efficiency of water use was obtained in treatment 100% of Eto, and the smallest production occurs in treatment of 0% of Eto. The use of supplemental irrigation in corn culture increased the productivity of grains for conditions, period characteristics and considered factors.  KEYWORDS: Zea mays L., irrigation management, grain production

scholarly journals Irrigation management of muskmelon with tensiometry

2017 ◽  
Vol 9 (3) ◽  
Author(s):  
Márcio José de Santana ◽  
Guilherme de Almeida Bocate ◽  
Murilo Augusto Sgobi ◽  
Stefany Silva de Souza ◽  
Taynara Tuany Borges Valeriano
Keyword(s):  
Soil Water ◽  
Water Use ◽  
Irrigation System ◽  
Irrigation Management ◽  
Fruit Weight ◽  
Fruit Yield ◽  
Stem Diameter ◽  
Soil Water Tension ◽  
Production And Consumption ◽  
Water Tension

The production and consumption of muskmelon have been increasing (MELO et al., 2014), thus, information on techniques for higher field productions are necessary. The experiment described in the present work was conducted in the IFTM, Uberaba, State of Minas Gerais, Brazil, aiming to evaluate the muskmelon yield under different soil water tensions. A randomized block experimental design was used with five treatments (soil water tensions of 10, 20, 30, 40 and 50 kPa) and four replications (plots of two rows of 14 plants). Two harvests were carried out and the fruit yield, stem diameter, number of fruits per plant and efficiency of water use were evaluated. Irrigation was performed with a drip irrigation system and managed with tensiometry. The cultivar Bonus n.2 was used with spacing of 1.0 x 0.6 m. The data of the variables were subjected to the F test and regression test. The treatments showed statistical differences in number of fruits per plant, fruit weight (fruit yield) and stem diameter. The highest fruit yield found was 1.36 kg fruit-1 and the highest water use efficiency was 4.08 g mm-1 with irrigation for a soil water tension of 10 kPa. The lowest fruit yield was found with irrigation for a soil water tension of 50 kPa.

scholarly journals Development and production of iceberg lettuce irrigated with magnetically treated water

Water SA ◽  
2021 ◽  
Vol 47 (4 October) ◽  
Author(s):  
Lis Tavares Ordones Lemos ◽  
Fábio Ponciano de Deus ◽  
Valter Carvalho de Andrade Júnior ◽  
Michael Silveira Thebaldi ◽  
Marcio Mesquita ◽  
...  
Keyword(s):  
Soil Water ◽  
Water Use ◽  
Dry Mass ◽  
Treated Water ◽  
Soil Water Tension ◽  
Iceberg Lettuce ◽  
Use Efficiency ◽  
Fresh And Dry Mass ◽  
Commercial Yield ◽  
Water Tension

Irrigated agriculture has become a concern, given the scarcity of freshwater. To reduce its water consumption, new techniques and technologies have been proposed. Based on this, the objective of this work was to evaluate the influence of different soil water tensions at initiation of irrigation with magnetically treated water, on ‘iceberg’ lettuce Lucy Brown (Lactuca Sativa L.) development and production. The experiment was conducted in a greenhouse, using a completely randomized factorial design, to evaluate two water types (magnetically treated water – MW and ordinary water – OW) and four soil water tensions at initiation of irrigation (T1 – 15 kPa, T2 – 25 kPa, T3 – 40 kPa and T4 – 70 kPa), with three replicates. Tensiometers were used to estimate soil water tension. The evaluated parameters were: aerial part fresh and dry total mass; commercial head fresh and dry mass, root fresh and dry mass; stem fresh and dry mass; stem length and diameter; percentage of leaves with tip burn, total and commercial yield; water use efficiency related to total and commercial yield; plant exposed area; and dry matter content. Despite achieving greater water use efficiency, the magnetic treatment may have hindered the removal of water from the soil by the crop, especially at increased soil water tension at initiation of irrigation.

scholarly journals VIABILIDADE PRODUTIVA DA CULTURA DA BATATA SUBMETIDA A DIFERENTES TENSÕES DE AGUA NO SOLO

Irriga ◽  
2018 ◽  
Vol 1 (1) ◽  
pp. 306
Author(s):  
Luciano Oliveira Geisenhoff ◽  
Geraldo Magela Pereira ◽  
Joaquim Alves Lima Junior ◽  
Rodrigo Otavio Rodrigues de Melo Souza ◽  
Ana Carla Ferreira Oliveira
Keyword(s):  
Solanum Tuberosum ◽  
Soil Water ◽  
Solanum Tuberosum L ◽  
Irrigation Management ◽  
Economic Feasibility ◽  
Dry Matter Content ◽  
Trickle Irrigation ◽  
Fresh Weight ◽  
Soil Water Tension ◽  
Water Tension

VIABILIDADE PRODUTIVA DA CULTURA DA BATATA SUBMETIDA A DIFERENTES TENSÕES DE AGUA NO SOLO LUCIANO OLIVEIRA GEISENHOFF1; GERALDO MAGELA PEREIRA2; JOAQUIM ALVES DE LIMA JUNIOR3; RODRIGO OTAVIO RODRIGUES DE MELO SOUZA4 E ANA CARLA FERREIRA DE OLIVEIRA5  1Engº Agrônomo, Prof. Doutor, Faculdade de Ciências Agrárias - FCA/Universidade Federal da Grande Dourados - UFGD/ Dourados – MS, Fone: (67) 3410-2412, [email protected] 2Engº Agrícola, Prof. Doutor, Departamento de Engenharia Agrícola-DEG/Universidade Federal de Lavras - UFLA/Lavras – MG, Fone: (35) 38291389, [email protected]º Agrônomo, Prof. Doutor, Universidade Federal Rural da Amazônia - UFRA/Campus Capanema – PA, Fone: (91) 98160-6563, [email protected]º Agrícola, Prof. Doutor, Universidade Federal Rural da Amazônia - UFRA/Campus Belém – PA, Fone: (91) 98193-0182, [email protected]º Agrônoma, Mestranda em Agronomia, Universidade Federal Rural da Amazônia - UFRA/Campus Belém – PA, Fone: (91) 98171-1538, [email protected]  1 RESUMO A irrigação da batata (Solanum tuberosum L.), como na maioria das olerícolas, além de ser um importante fator de produção, é o que mais favorece o aumento da produtividade, bem como, o aprimoramento da qualidade do produto. Desta forma, objetivou-se com o presente estudo avaliar a resposta da cultura da batata, cultivar Ágata, a diferentes tensões de água no solo, irrigada por gotejamento, visando estabelecer critérios para o manejo da irrigação na cultura da batata. O experimento foi conduzido em campo, em área experimental do Departamento de Engenharia da Universidade Federal de Lavras (UFLA), no período de julho a outubro de 2010. O delineamento experimental utilizado foi em blocos casualizados (DBC), compreendendo-se cinco tratamentos e quatro repetições. Os tratamentos constituíram-se de cinco tensões da água no solo, 15, 35, 55, 75 e 95 kPa. Para a obtenção dos maiores valores de: massa fresca total de tubérculos por planta, massa fresca média de tubérculos por planta, produtividade total de tubérculos, massa fresca de tubérculos comerciais por planta, produtividade de tubérculos comerciais, número de tubérculos comerciais por planta, associados a uma excelente classificação comercial, as irrigações devem ser realizadas quando a tensão de água no solo acusar o valor de 15 kPa, á uma profundidade de 0,15 m. O rendimento produtivo da cultura reduziu em função do aumento da tensão da água no solo, no intervalo entre 15 e 95 kPa. O teor de matéria seca de tubérculos apresentou resposta aos tratamentos, sendo que o valor máximo de 18,77% foi obtido com a tensão de 60 kPa.  Palavras-chaves: Solanum tuberosum L., Irrigação localizada, Manejo da irrigação.  GEISENHOFF, L. O.; PEREIRA, G. M.; LIMA JUNIOR, J. A.; SOUZA, R. O. R. M.; OLIVEIRA, A. C. F.VIABILITY PRODUCTION OF POTATO CROP UNDER SUBMITTED TO DIFFERENT SOIL WATER TENSION  2 ABSTRACT  The irrigation of potato ( Solanum tuberosum L.) , as in most vegetable crops, as well as being an important factor of production, is what most favors the increase of productivity as well as the improvement of product quality. Thus, objective with this study evaluate the response of the potato cultivar Agate, different strains of soil water, trickle irrigated, in order to establish criteria for irrigation management, as well estimating the economic feasibility of irrigation system in potato.The experiment was conducted in an open field in the experimental area of Department of Engineering, Federal University of Lavras (UFLA), during july-october 2010.The experimental design was randomized blocks (DBC), comprising up five treatments and four replicates.The treatments consisted of five soil water stress, 15, 35, 55, 75 and 95 kPa. It was concluded that to obtain higher values: total fresh weight of tubers per plant, mean fresh weight of tubers per plant, total yield of tubers, fresh weight of marketable tubers per plant, yield of marketable tubers, number of marketable tubers per plant, associated with an excellent commercial grading, irrigation should be done when the soil water tension acknowledge the value of 15 kPa at a depth of 0.15 m. The yield of crop yield declined linearly with increasing soil water tension in the range between 15 and 95 kPa. The dry matter content of tubers showed a quadratic response to treatments, and the maximum value of 18.77% was obtained with a tension of 60 kPa. Keywords: Solanum tuberosum L, Trickle irrigation, Irrigation management

scholarly journals CULTIVO DA BETERRABA SOB DIFERENTES TENSÕES DE ÁGUA NO SOLO

Irriga ◽  
2019 ◽  
Vol 24 (2) ◽  
pp. 220-235
Author(s):  
Jonathan Rocha Miranda ◽  
Geraldo Magela Pereira
Keyword(s):  
Soil Water ◽  
Water Use ◽  
Drip Irrigation ◽  
Irrigation Management ◽  
Innovative Design ◽  
Soil Water Tension ◽  
Experimental Area ◽  
Engineering Department ◽  
Water Tension

CULTIVO DA BETERRABA SOB DIFERENTES TENSÕES DE ÁGUA NO SOLO     JONATHAN DA ROCHA MIRANDA¹ E GERALDO MAGELA PEREIRA²   1Doutorando em Engenharia Agrícola pela Universidade Federal de Lavras (UFLA) – Campus Universitário, Departamento de Engenharia, C.P. 3037 – CEP 37200-000, Lavras-MG, Brasil. [email protected]; ²Professor Titular da Universidade Federal de Lavras (UFLA) - Campus Universitário, Departamento de Engenharia, C.P. 3037- CEP 37200-000, Lavras-MG, Brasil. [email protected].     1 RESUMO   Objetivou-se com este estudo, avaliar o efeito de diferentes tensões de água no solo sobre a produção de beterraba, cultivada em ambiente protegido e irrigada por gotejamento, de forma a estabelecer critérios para o manejo adequado da irrigação. O experimento foi conduzido na área experimental do Departamento de Engenharia da Universidade Federal de Lavras, no período de fevereiro a maio de 2016. O delineamento experimental utilizado foi em blocos completos casualizados, com seis tratamentos e quatro repetições. Os tratamentos corresponderam as tensões da água no solo de 15; 25; 35; 45; 55 e 65 kPa. Conclui-se que para a obtenção de maior produtividade e eficiência no usa da água, as irrigações devem ser realizadas quando a tensão da água no solo estiver em torno de 15 kPa, a uma profundidade de 0,15 m.   Palavras-chave: Manejo de irrigação; Ambiente protegido; Sensor de Resistência Elétrica; Eficiência no Uso da Água.     MIRANDA, J.R; PEREIRA, G.M. BEET CULTIVATION UNDER DIFFERENT SOIL WATER TENSIONS     2 ABSTRACT   The objective of this study was to evaluate the effect of different soil water stresses on beet production, cultivated in a protected environment and irrigated by drip irrigation, to establish criteria for proper irrigation management. The experiment was conducted in the experimental area of the Engineering Department of the Federal University of Lavras (UFLA), from February to May 2016. The innovative design was a randomized complete block (DBC), with six treatments and four replications. The treatments consisted of six soil water tension stresses (15, 25, 35, 45, 55 and 65 kPa). From the results obtained, it was concluded that to achieve higher values of productivity and efficiency in the use of water, irrigations should be carried out when the water tension in the soil is around 15 kPa, to a depth of 0.15 m.   Keywords: Irrigation management; Protected environment; Watermark, Efficiency in Water Use.

scholarly journals Gaseous irrigation control system: descriptions and phisical tests for performance assessment

Bragantia ◽  
2006 ◽  
Vol 65 (3) ◽  
pp. 501-510 ◽  
Author(s):  
Adonai Gimenez Calbo ◽  
Washington Luiz de Carvalho e Silva
Keyword(s):  
Soil Water ◽  
Irrigation Management ◽  
Irrigation Scheduling ◽  
Measuring System ◽  
Measuring Device ◽  
Soil Water Tension ◽  
First Case ◽  
Immersion Technique ◽  
Irrigation Control ◽  
Water Tension

Irrigas is a water tension measuring system made out of a porous cup (sensor), connected to a gas pressurizing/measuring device by a flexible tube. Water tension (T) is obtained from the equation T=Td-p or T=Ts-p, where Td is the sensor desorption critical water tension (bubbling beginning), Ts is the sensor sorption critical water tension (bubbling ceasing) and p is the applied gas pressure. Differently from conventional tensiometers, the irrigas porous cup cavity is filled with air. This characteristics makes the irrigas system nearly maintenance free and also eliminates the need of making hydrostatic pressure corrections for sensor depth. The system was tested both in the desorption and sorption modes. In the first case the Richards pressure chamber was used to adjus)t the soil water tension which makes the porous cup air permeable. The water tension thus obtained was always practically equal to the Td values measured by the bubbling method, observation that is a physical validation of the barrel immersion technique for irrigas usage for irrigation management. Important for instrument dimensioning, porous cup water loss as a function of water tension measured from zero to Td was diminutive, increased with the soil water tension and was smaller in higher Td porous cups. In the sorption mode, functioning as a gaseous tensiometer, driven by a steady air-flow source, irrigas sensors yielded, directly, water tension readings ranging from zero to Ts. For irrigation scheduling purposes, commercial irrigas water tension systems can be selected according to crop critical water tension requirements.

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