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An irrigation controller mechanically actuated by soil-water tension: I - Design, development and laboratory evaluations AGRIAMBI
Almeida,Alexsandro C. S.; Botrel,Tarlei A.; Raine,Steven R.; Camargo,Antonio P. de; Pinto,Marinaldo F.; Salvador,Conan A..
ABSTRACT The objective of this study was to develop and evaluate an irrigation controller that was mechanically actuated by soil-water tension within laboratory conditions. The controller was designed and constructed using readily available hydraulic fittings and other componentry. The main components of the controller were a tensiometer; a rubber diaphragm that moves according to the variation in tension inside of the tensiometer; an activation rod that transfers the movement from diaphragm to the switch valve; and a steel spring that regulates the activation of soil water tension. Six irrigation controller samples were tested in the laboratory to evaluate the mechanical performance and component forces required to activate the controllers. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Irrigation scheduling; Tensiometer; Automation.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000600369
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Desenvolvimento da cultura do feijoeiro submetida a dois sistemas de manejo de irrigação e de cultivo - DOI: 10.4025/actasciagron.v31i3.621 Agronomy
Pavani, Luiz Carlos; UNESP; Lopes, Adriano da Silva; UEMS; Pereira, Gener Tadeu; UNESP.
A cultura do feijoeiro apresenta elevada importância no contexto agrícola nacional. Além de ser uma cultura que atende às características da agricultura familiar, também é cultivada em áreas extensivas com alta tecnologia. Pesquisas relacionadas ao desenvolvimento do feijoeiro frente às variantes edafoclimáticas regionais vêm assumindo papel de destaque, principalmente por se tratar de uma planta sensível tanto ao déficit quanto ao excesso hídrico. O objetivo deste trabalho foi avaliar a cultura do feijoeiro de ‘inverno’ submetida a dois métodos de manejo de irrigação, em pivô central, um via solo por meio de tensiômetros, outro via clima por meio do tanque Classe ‘A’, em dois sistemas de plantio, convencional e direto, no primeiro ano. Foram avaliados o...
Palavras-chave: 5.01.00.00-9 Agronomia Phaseolus vulgaris; Potencial mátrico; Tanque Classe ‘A’; Tensiômetro Engenharia de Água e Solo Phaseolus vulgaris; Matrix potential; Class ‘A’ pan; Tensiometer.
Ano: 2009 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/621
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Distribución espacial de nutrimentos en la solución del suelo para la producción intensiva de fresa. Colegio de Postgraduados
Mendieta Muñoz, Lorenzo Antonio.
Con el objeto de conocer el movimiento espacio-temporal de los nutrientes en el bulbo húmedo de un suelo vertisol se estableció un experimento en una parcela comercial para la producción de fresa en Zamora, Michoacán, con extractores de solución (ESS) comúnmente denominados “chupatubos”, éstos se instalaron en macro-túneles con fresas, en tres profundidades (10, 20 y 30 cm), se consideraron tres repeticiones por cada profundidad y fueron distribuidos completamente al azar en 2 hectáreas. El estudio se realizó durante 18 semanas. Los análisis químicos de la solución del suelo se realizaron por espectrofotometría AES-ICP en un equipo Varian, Liberty II y se determinó determinó P, K, Ca, Mg, Fe, Mn, Zn, Cu Na y B. Se observaron diferencias estadísticas...
Palavras-chave: Fragaria vesca L.; Solución del suelo; Extractores de solución; Tensiómetro; Soil solution; Solution extractors; Tensiometer; Maestría; Edafología.
Ano: 2011 URL: http://hdl.handle.net/10521/378
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DROPLET SPECTRA AND SURFACE TENSION OF SPRAY SOLUTIONS BY BIOLOGICAL INSECTICIDE AND ADJUVANTS REA
Costa,Lilian L.; Silva,Henrique J. P. Soares da; Almeida,Dieimisson P.; Ferreira,Marcelo da C.; Pontes,Nadson de C..
ABSTRACT Biological insecticides can be another pest control method used in integrated pest management; hence there is a demand for scientific information about these products to understand the appropriate application technique. The aim of this study was to evaluate the spray spectra data by different nozzle types using biological insecticide isolated and with adjuvants, as well the surface tension of these spray solutions. For droplet spectra data, a particle size analyzer was used and for surface tension of the spray solution, the method of pendant drop was used. Among the nozzles tested, ADI 11002 provided greater droplets median diameter volume, a lower percentage of droplets with diameters less than 100 μm and also the highest coefficient of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coefficient of uniformity; Volumetric median diameter; Application technology; Tensiometer.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000200292
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Época de suspender as irrigações da cultura do trigo. Repositório Alice
GUERRA, A. F.; ANTONINI, J. C. dos A..
1996
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Wheat; Triticum aestivum; Tensão da água no solo; Tensiômetros; Água aplicada; Soil-water tension; Tensiometer; Applied water.
Ano: 1996 URL: http://www.alice.cnptia.embrapa.br/handle/doc/823016
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Epoca de suspender as irrigacoes da cultura do trigo. Repositório Alice
GUERRA, A.F.; ANTONINI, J.C. dos A..
O objetivo deste estudo foi avaliar o efeito do corte do suprimento de agua ao trigo (cv. BR-12 Aruana) aos 69, 77, 85, 95, 102 e 115 dias apos o plantio, o que corresponde aos estadios de desenvolvimento de inicio da antese, cariopse aquosa, estado leitoso, estado de massa mole, estado de massa dura e cariopse dura, respectivamente, sobre o rendimento e seus componentes, e a qualidade dos graos. Todas as parcelas experimentais foram irrigadas sempre que a tensao de agua no solo, medida a 10 cm de profundidade, atingia valores de 48 kPa, ate o estadio de desenvolvimento, em que houve a suspensao das irrigacoes de cada tratamento. Verificou-se uma reducao significativa do rendimento de grao nos tratamentos em que as irrigacoes foram suspensas antes que...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Tensao de agua no solo; Tensiometro; Agua aplicada; Soil-water tension; Tensiometer; Applied water.
Ano: 1996 URL: http://www.alice.cnptia.embrapa.br/handle/doc/104151
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Gaseous irrigation control system: descriptions and phisical tests for performance assessment Bragantia
Calbo,Adonai Gimenez; Silva,Washington Luiz de Carvalho e.
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...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Irrigas; Irrigation scheduling; Porous cup; Tensiometer; Water tension.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052006000300017
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Irrigation controller mechanically actuated by soil-water tension: II - Field evaluations AGRIAMBI
Almeida,Alexsandro C. S.; Botrel,Tarlei A.; Raine,Steven R.; Camargo,Antonio P. de; Pinto,Marinaldo F.; Salvador,Conan A..
ABSTRACT In this study, a field evaluation of the performance of an irrigation controller mechanically actuated by soil-water tension (SWT) was performed. The controller employs a tensiometer used as a sensor of SWT to directly control a mechanically actuated hydraulic valve. Six controllers were installed in an orchard to control the irrigation for six rows of plants over 64 days. Each controller controlled the irrigation of one lateral drip line. The drip irrigation system was gravity-fed from a water source placed 7 m above the soil surface. The SWT and the pressure in each lateral line were measured to evaluate the performance of the controllers. All the controllers tested in the field autonomously initiated and terminated the irrigation during the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Irrigation scheduling; Technological innovation; Tensiometer; Automation.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000500298
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Irrigation management influence and fertilizer doses with boron on productive performance of cauliflower REA
Pereira,Michel E. M.; Lima Junior,Joaquim A. de; Souza,Rodrigo O. R. de M.; Gusmão,Sergio A. L. de; Lima,Valdeides M..
ABSTRACT In order to provide scientific information about the irrigated cauliflower production in Northeast of Para, an experiment was installed in the Federal Rural University of Amazonia farm with the Desert hybrid under different water tensions on the ground and boron doses in the municipality of Igarapé-Açu – PA. The experimental design was a randomized block in a 4 x 4 factorial, sixteen treatments with three replications. The treatments consisted of four water tensions on the ground (15, 30, 45 and 60 kPa) as an indicative of the time to irrigate and four boron doses (0, 2, 4 and 6 kg ha-1). The irrigation was performed with drippers and irrigation management with tensiometers. Each plot, 4 m2, consisted of 8 plants located in the spacing of 1.0 m...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brassica oleracea var; Botrytis; Drip irrigation; Tensiometer.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000500811
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Measurement systems of soil water matric potential and evaluation of soil moisture under different irrigation depths REA
Beraldo,José M. G.; Cora,José E.; Fernandes,Edemo J..
The development of new methodologies and tools that enable to determine the water content in soil is of fundamental importance to the practice of irrigation. The objective of this study was to evaluate soil matric potential using mercury tensiometer and puncture digital tensiometer, and to compare the gravimetric soil moisture values obtained by tensiometric system with gravimetric soil moisture obtained by neutron attenuation technique. Four experimental plots were maintained with different soil moisture by irrigation. Three repetitions of each type of tensiometer were installed at 0.20 m depth. Based on the soil matric potential and the soil water retention curve, the corresponding gravimetric soil moisture was determined. The data was then compared to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Tensiometer; Digital tensiometer; Neutron attenuation technique.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000300006
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Nitrogen doses and water balance components at phenological stages of corn Scientia Agricola
Silva,Monica Martins da; Libardi,Paulo Leonel; Fernandes,Flávia Carvalho Silva.
Determining the intensity of the water balance components in the control volume of a soil, and consequently defining the most likely periods of occurrence of a water deficit in a crop, is an exercise that requires knowledge about soil, climate and plant factors. This research aimed to evaluate soil water balance components at phenological stages of corn (Zea mays L.) under no-till system, when fertilized with 60, 120, and 180 kg ha-1 of nitrogen. The field experiment was carried out in Piracicaba, State of São Paulo, Brazil, on a Typic Hapludox. Evaluations were made in the 2004/2005 and 2005/2006 corn cropping seasons, divided over three stages according to the plant's phenology. Runoff was not taken into account. Measurements were made for precipitation...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Internal drainage; Hydraulic conductivity; Actual evapotranspiration; Tensiometer; No-till system.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400013
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Root distribution analysis by digital image processing and its relation with soil water dynamics measured by neutron probe and by tensiometer. Repositório Alice
BASSOI, L. H..
bitstream/item/176160/1/Separata-8467.pdf
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Distribuicao; Imagem digital; Relacao; Root distribution; Digital image; Analysis; Soil water relation; Tensiometer; Água; Análise; Raiz; Tensiômetro; Solo; Soil.
Ano: 1997 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/131593
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Sensor placement for soil water monitoring in lemon irrigated by micro sprinkler AGRIAMBI
Coelho,Eugênio F.; Santos,Delfran B. dos; Azevedo,Carlos A. V. de.
This research had as its objective the investigation of an alternative strategy for soil sensor placement to be used in citrus orchards irrigated by micro sprinkler. An experiment was carried out in a Tahiti lemon orchard under three irrigation intervals of 1, 2 and 3 days. Soil water potential, soil water content distribution and root water extraction were monitored by a time-domain-reflectometry (TDR) in several positions in soil profiles radial to the trees. Root length and root length density were determined from digital root images at the same positions in the soil profiles where water content was monitored. Results showed the importance of considering root water extraction in the definition of soil water sensor placement. The profile regions for soil...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Tensiometer; Soil water content; Soil water potential; Irrigation management.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662007000100006
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Silicon fertilization and soil water tensions on rice development and yield AGRIAMBI
Oliveira,Jakeline R. de; Koetz,Marcio; Bonfim-Silva,Edna M.; Silva,Tonny J. A. da.
ABSTRACT The cultivation of upland rice (Oryza sativa) in Brazil occurs mainly in the Cerrado, a region with adverse weather conditions. The use of silicon in its cultivation becomes important, since this nutrient provides higher rigidity, lower transpiration and higher resistance to dry spells in rice plants. The objective of the present study was to evaluate the effect of silicon fertilization and soil water tensions on upland rice development and yield in a Cerrado Oxisol. A 5 x 5 fractionated factorial with five soil water tensions (0, 15, 30, 45 and 60 kPa) and five silicon doses (0, 120, 240, 480 and 960 mg dm-3) was used, which were distributed in a randomized block design, with four replicates. Plant height, number of tillers, number of panicles,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Oryza sativa; Tensiometer; Silicon.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000200138
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Tensiômetros para manejo da irrigação em hortaliças. Infoteca-e
MAROUELLI, W. A.; SILVA, H. R. da; SILVA, W. L. C. e; CARRIJO, O. A..
Folder.
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E) Palavras-chave: Hortalica; Irrigacao; Tensiometro; Equipamento; Vegetables; Irrigation; Tensiometer; Equipment.
Ano: 1998 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/764449
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Water consumption and soil moisture distribution in melon crop with mulching and in a protected environment Rev. Bras. Frutic.
Monteiro,Rodrigo Otávio Câmara; Coelho,Rubens Duarte; Monteiro,Priscylla Ferraz Câmara; Whopmans,Jan; Lennartz,Bernd.
Mulching has become an important technique for land cover, but there are some technical procedures which should be adjusted for these new modified conditions to establish optimum total water depth. It is also important to observe the soil-water relations as soil water distribution and wetted volume dimensions. The objective of the present study was to estimate melon evapotranspiration under mulching in a protected environment and to verify the water spatial distribution around the melon root system in two soil classes. Mulching provided 27 mm water saving by reducing water evaporation. In terms of volume each plant received, on average, the amount of 175.2 L of water in 84 days of cultivation without mulching, while when was used mulching the water...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Evapotranspiration; Plastic cover; Tensiometer; Irrigation.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452013000200026
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Water relations and photosynthesis as criteria for adequate irrigation management in 'Tahiti' lime trees Scientia Agricola
Silva,Cláudio Ricardo da; Folegatti,Marcos Vinícius; Silva,Tonny José Araújo da; Alves Júnior,José; Souza,Claudinei Fonseca; Ribeiro,Rafael Vasconcelos.
Irrigation scheduling based on soil moisture status is one of the most useful methods because of its practicality and low cost. The effects of available soil water depletion on evapotranspiration (ETc), transpiration (E), leaf water potential at predawn (psiP) and midday (psiM), stomatal conductance (gs) and net CO2 assimilation (A) in lime 'Tahiti' trees (Citrus latifolia) were evaluated to improve irrigation schedule and minimize water use without causing water stress. The trees were spaced 7 <FONT FACE=Symbol>´</FONT> 4 m and drip-irrigated by four drippers with the available soil water content (AWC) depleted by suspension of irrigation (40 days). Leaf water potential was measured on a pressure chamber (psiP and psiM) and leaf gas exchange...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Evapotranspiration; Citrus; Lysimeter; Gas exchange; Tensiometer.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000500001
Registros recuperados: 17
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