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País Brazil (26) China (10) United States (7) United Kingdom (2) Idioma Inglês (42) Português (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 45 Primeira ... 1 2 3 ... Última Produção de pimenta tabasco com aplicação de CO2, utilizando-se irrigação por gotejamento - doi: 10.4025/actasciagron.v33i1.5374 Agronomy Paula, Fabiana Luiza Matielo de; Escola Superior de Agricultura Luiz de Queiroz; Frizzone, José Antônio; USP-ESALQ, Piracicaba; Paula, Adalberto Luiz de; Escola Superior de Agricultura Luiz de queiroz; Dias, Carlos Tadeu dos Santos; Escola Superior de Agricultura Luiz de queiroz; Soares, Tales Miler; Universidade Federal do Recôncavo da Bahia. A aplicação de CO2 via água de irrigação produz o rebaixamento do pH da solução do solo, causando variações na mobilidade dos nutrientes e consequentes efeitos na absorção. O objetivo deste trabalho foi analisar os efeitos de doses de dióxido de carbono (CO2), aplicadas via irrigação por gotejamento, na produção da pimenta Tabasco. O delineamento experimental foi o de blocos casualizados com quatro tratamentos e oito repetições. Os tratamentos foram quatro doses de CO2: 0 (T1), 451,95 (T2); 677,93 (T3) e 903,92 (T4) kg ha-1. Os frutos foram pesados e contados; o comprimento e o diâmetro de frutos foram obtidos com a média de 20 frutos por planta. Ocorreu efeito quadrático (p < 0,01) para as doses de CO2 sobre a produção e o efeito quadrático (p <... Palavras-chave: Capsicum frutescens L.; Dióxido de carbono; Irrigação por gotejamento Capsicum frutescens L.; Carbon dioxide; Drip irrigation. Ano: 2011 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/5374 Root growth of sugarcane irrigated with wastewater through subsurface drip system CIGR Journal Santos, Leonardo Nazário Silva dos; Barbosa, Eduardo Augusto Agnellos; Nazário, Aline Azevedo; Gonçalves, Ivo Zution; Ohashi, Augusto Yukitaka Pessinatti; Matsura, Edson Eiji; Pires, Regina Célia de Matos. The use of wastewater in agriculture is an alternative to provide water and nutrients for plants.  However, root system development can be affected by water quality and depth of wastewater applied.  The objective of this study was to evaluate the sugarcane root system growth using a minirhizotron in a field irrigated with treated sewage effluent and freshwater by subsurface drip irrigation.  The treatments tested were two drip line installation depths (0.2 and 0.4 m); two water sources (treated sewage effluent and freshwater) and non-irrigated plots as control.  The experiment was a randomized block design with a 2×2 + 1 factorial, with three replications.  The root system evaluation (root length and spatial distribution) was performed using a... Tipo: Info:eu-repo/semantics/article Palavras-chave: Root scanner; Minirhizotron; Drip irrigation; Time domain reflectometry (TDR); Saccharum officinarum L.. Ano: 2017 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3881 Calibrating and validating AquaCrop model for maize crop in Northern zone of Nigeria CIGR Journal Ezekiel, Oiganji; Igbadun, H. E.; Mudiare, O.J.; Oyebode, M.A.. Farmers in the northern Guinea Savannah ecological zone of Nigeria have been experiencing declining crop yield due to erratic water supply. In recent times, research on better water management and interaction between effects of climate, soil and field management on crop production is fast gaining grounds with the use of models. Models can be used to predict the impact of long-term climate variability, thus providing an opportunity of better techniques compared with the traditional multi-location trials. This study presents the calibration and validation of AquaCrop model for drip irrigated maize (Zea mays). Calibration was done using data of 2013, while validation across seasons was done with data of 2014. The modelling efficiency of grain yield, biomass... Tipo: Info:eu-repo/semantics/article Palavras-chave: Agricultural Engineering/ soil and water conservation engineering growth stage; Deficit irrigation; Drip irrigation; Water management; Modelling. Ano: 2016 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3755 Effective moisture conservation method for heavy soil under drip irrigation CIGR Journal Mostafa, Harby M. S.. Abstract: Drip irrigation is one of the most efficient systems in delivering water to the plant root zone but it still allows relatively high evaporation from the saturated zone that develops under emitters especially in clay soils of low infiltration rates.  Initial lateral water movement may take a long time in such soils thus exposing surface water to high evaporation.  The vertical columns method induces water infiltration keeping the actual water surface deeper in the soil profile.  The objective of this research is to compare between the effect of vertical compost and sand columns on the distribution of water in the root zone and the potential for water saving in clay soil.  A field experiment was conducted and the results indicated that the vertical... Tipo: Info:eu-repo/semantics/article Palavras-chave: Drip irrigation; Vertical mulch; Water saving. Ano: 2014 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2743 Solar pump irrigation system for green agriculture CIGR Journal Hossain, M A; Hassan, M S; Ahmmed, S; Islam, M S. Ever increasing fuel cost and doubtful availability of electricity hampers the irrigated crop production. Solar pump may be an alternative for irrigation for crop production especially in the off-grid areas. This paper presents the technical and economic suitability of solar pump irrigations of rice and no-rice crops in Bangladesh. Four submersible solar pumps (1050 Wp) were installed in different locations for irrigating rice, wheat and vegetables. The solar pump was used for drip irrigation and furrow irrigation for cultivation of brinjal and tomato during the winter seasons of 2010-11, 2011-12 and 2012-13. There were no significant differences of yields of brinjal between drip and furrow irrigations in the year 2010-11 in Gazipur and during 2011-12 in... Tipo: Info:eu-repo/semantics/article Palavras-chave: Irrigation and water management; Solar energy Solar pump; PV panel; Drip irrigation; Tomato; Brinjal; Rice. Ano: 2014 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2836 Innovative Technology of Egyptian Mosques by Using Solar Energy and Reusing Ablution Water in Sustainable Crop Production CIGR Journal Ramadan, Abdelraouf. Egypt is nowadays facing a lot of challenges, such as limited water and energy resources. In the near future and after building El-NAHDA Dam in Ethiopia, Egypt will suffer from a severe aqueous shortage. Another fatal problem is the unavailability of getting enough energy supplies. Here, the problem of energy is a natural consequence of unsustainable development of energy patterns followed during the last decades. There are many new water resources that have not been well exploited in agriculture. One of these resources is the ablution water in the Egyptian mosques. This new resource can be managed by solar (photovoltaic) energy, as Egypt has good weather with high rates of solar radiation which can reach up to 3000 hours/year. This study cared out to... Tipo: Info:eu-repo/semantics/article Palavras-chave: Solar energy; Photovoltaic system; Reuse ablution water; Drip irrigation; Green roofs; Water and energy use efficiency. Ano: 2018 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5066 Effective moisture conservation method for heavy soil under drip irrigation CIGR Journal Harby M. S. Mostafa; Dr. of Agricultural Eng.. Abstract: Drip irrigation is one of the most efficient systems in delivering water to the plant root zone but it still allows relatively high evaporation from the saturated zone that develops under emitters especially in clay soils of low infiltration rates. &nbsp;Initial lateral water movement may take a long time in such soils thus exposing surface water to high evaporation. &nbsp;The vertical columns method induces water infiltration keeping the actual water surface deeper in the soil profile. &nbsp;The objective of this research is to compare between the effect of vertical compost and sand columns on the distribution of water in the root zone and the potential for water saving in clay soil. &nbsp;A field experiment was conducted and the... Palavras-chave: Drip irrigation; Vertical mulch; Water saving. Ano: 2014 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2743 EFFECT OF ALTERNATE PARTIAL ROOT ZONE DRIP IRRIGATION AND MULCHING ON ZUCCHINI CIGR Journal Imam, Hisham Mohamed. Innovative irrigation agricultural and irrigation strategies are desirable in the face of dwindling water resources and increasing demand for food, especially in arid and semi-arid areas. The presented work investigated the effect of both  Alternate Partial Root-Zone Drying (APRD), mulching and drip irrigation system type on yield productivity and water use efficiency of Zucchini. Field experiments were conducted at Testing and Research Station for Tractors and Farm Machinery, Alexandria Governorate. The experimental treatments were: two types of irrigation management (full and APRD), and two soil covering (plastic mulching and without plastic mulch) under both surface and subsurface drip irrigation systems. The soil electrical conductivity was 8.19... Tipo: Info:eu-repo/semantics/article Palavras-chave: Drip irrigation; APRD; Mulching; Saline soil; And Zucchini. Ano: 2021 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6215 Modeling Hydraulic Performance of a Drip Irrigation Network Directly Coupled to a Photovoltaic Pumping System CIGR Journal El Aissaoui, Abdellah; Hajar, El Khalfi. Drip irrigation network coupled to photovoltaic pumping system presents an alternative solution that can efficiently improves use of water and energy by small and medium irrigated farming systems compared to conventional energy use for water pumping. Standalone photovoltaic water pumping systems (PVWPS) coupled to drip irrigation network constitute the best technico-economical solution compared to PVWPS using electrical or water storage demanding additional cost for the storage device. However, the standalone PVWPS need adequate process control to optimally be coupled with a drip irrigation network as adaptation between variable irradiance inputs and hydraulic outputs are needed to overcome problem of emission uniformity instability that can affect the... Tipo: Info:eu-repo/semantics/article Palavras-chave: Drip irrigation; Standalone; Photovoltaic pumping system; Performances; Hydraulic; Emission uniformity. Ano: 2021 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6173 Production of drip irrigated squash (Cucurbita Pepo, L.) under different levels of irrigation and uniformity CIGR Journal Elnemr, Moataz Kamal; Elmetwalli, Adel Helal. This study aimed to get the most possible benefit of using deficit irrigation to maximize water productivity of squash, besides investigating the ability of drip irrigation uniformity to reduce the effect of deficit irrigation on squash crop production (Cucurbita pepo - Hybrid Revera). Three levels of irrigation uniformity levels (UL) based on the value of uniformity coefficient (UC) namely excellent (E), very good (VG), and unacceptable (UA) were examined with three irrigation levels based on crop evapotranspiration (ETc) which were full irrigation (FI or 100% ETc) to be compared to two defecit irrigation levels 90% ETc (DI90), and 80% ETc (DI80). Results showed that both UL and DI had significant effect on squash production. There was significant... Tipo: Info:eu-repo/semantics/article Palavras-chave: Deficit irrigation; Drip irrigation; Levels; Production; Squash; Uniformity.. Ano: 2021 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6277 Solar pump irrigation system for green agriculture CIGR Journal M A Hossain; Principal Scientific Officer; M S Hassan; Chief Scientific Officer; S Ahmmed; Chief Scientific Officer; M S Islam; Former Director (Research). Ever increasing fuel cost and doubtful availability of electricity hampers the irrigated crop production. Solar pump may be an alternative for irrigation for crop production especially in the off-grid areas. This paper presents the technical and economic suitability of solar pump irrigations of rice and no-rice crops in Bangladesh. Four submersible solar pumps (1050 Wp) were installed in different locations for irrigating rice, wheat and vegetables. The solar pump was used for drip irrigation and furrow irrigation for cultivation of brinjal and tomato during the winter seasons of 2010-11, 2011-12 and 2012-13. There were no significant differences of yields of brinjal between drip and furrow irrigations in the year 2010-11 in Gazipur and during 2011-12 in... Palavras-chave: Irrigation and water management; Solar energy Solar pump; PV panel; Drip irrigation; Tomato; Brinjal; Rice. Ano: 2014 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2836 Soil water storage variability in a three-dimensional analysis in the root zone of irrigated melon Bragantia Nascimento,Francisco Airdesson Lima do; Silva,Alisson Jadavi Pereira da; Campos,Allan Radax Freitas. ABSTRACT A detailed knowledge of the soil water storage variability in the root zone can promote recommendations regarding the ideal positioning of sensors, as well as make the calculation of soil water balance more precise and accurate. This study aimed to assess soil water storage variability in the melon root zone and indicate – based on spatial variation of soil water storage – the regions of highest rootactivity of the melon crop in different development stages. Soil waterstorage was measured using time domain reflectometry (TDR) in 40 monitoring points. The data were daily collected in two periods: (i) immediately before irrigation and (ii) 30 min after irrigation. The soil water storage variation in the melon root zone occurs with greater intensity... Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil water balance; Drip irrigation; Irrigation management. Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000400587 Mulching materials and wetted soil percentages on zucchini cultivation Ciência e Agrotecnologia Silva,Gustavo Henrique da; Cunha,Fernando França da; Morais,Caio Vieira de; Freitas,Agnaldo Roberto de Jesus; Silva,Derly José Henriques da; Souza,Caetano Marciano de. ABSTRACT Polyethylene mulch can cause serious problems in the environment. A promising alternative to polyethylene mulch is biodegradable mulch. Therefore, a two-year experiment was carried out with zucchini (Cucurbita pepo L.) during the cropping seasons of 2017 and 2018 in Southeast Brazil to investigate the effects of four soil mulching treatments (white polyethylene mulch: WP, black polyethylene mulch: BP, biodegradable mulch of brown recycled paper: RP and nonmulched: NM) and two wetted soil percentages (50 and 70% of the soil surface) using a randomized block design with five repetitions. The average water consumption of the zucchini was 157 mm in the WP treatment, 155 mm in the BP treatment, 155 mm in the WP treatment and 215 mm in the NM treatment.... Tipo: Info:eu-repo/semantics/article Palavras-chave: Biodegradability; Cucurbita pepo; Drip irrigation; Water saving.. Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542020000100217 Irrigation with domestic treated sewage and nitrogen fertilizing in sunflower cultivation REA Bezerra,Francicso M. L.; Freitas,Cley A. S. de; Silva,Alexandre R. A. da; Mota,Suetônio de B.; Aquino,Boanerges F. de. The objective of this study was to evaluate the productive performance of sunflower plants irrigated with different levels of domestic treated sewage and groundwater well with different doses of nitrogen. It was used randomized blocks design in split-split plots with four replications. In the plots, we evaluated the effect of two types of irrigation water, in the subplots we evaluated the five irrigation levels expressed as 25, 50, 75, 100 and 125% of the Class A pan Evaporation (CAE), and in the sub subplots, we evaluated the effect of four different doses of nitrogen (25, 50, 75 and 100 kg ha-1). The irrigation of sunflower with domestic sewage produced greater yield potential of grain and oil. The use of water from treated wastewater can replace up to... Tipo: Info:eu-repo/semantics/other Palavras-chave: Helianthus annuus; Recycle; Drip irrigation; Nitrogen fertilization. Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000600014 Coffea arabica (cv Catuaí) production and bean size under different population arrangements and soil water availability REA Sakai,Emilio; Barbosa,Eduardo A. A.; Silveira,Jane M. de C.; Pires,Regina C. de M.. The purpose of this research was to evaluate the effect of drip irrigation under different population arrangements on the phytometric features, coffee productivity and bean size classification according to sieve retention. The experiment with Coffea arabica L. cv Catuaí was carried out in Mococa, São Paulo, Brazil. The experimental design was a 6 x 2 factorial scheme in randomized blocks, with four replications. The six densities of plantation were E1 (1.60 x 0.50 m); E2 (1.60 x 0.75 m); E3 (1.60 x 1.00 m); E4 (3.20 x 0.50 m); E5 (3.20 x 0.75 m) and E6 (3.20 x 1.00 m), which were divided according to the availability of water (irrigated - I - or non-irrigated - NI - groups). Data were submitted to analysis of variance and averages compared by Tukey test at... Tipo: Info:eu-repo/semantics/article Palavras-chave: Drip irrigation; Coffee productivity; Coffee crop phytometry; Coffee bean size. Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000100015 Jatropha seed oil content and yield under different irrigation and potassium fertilization levels REA Deus,Fábio P. de; Faria,Manoel A. de; Oliveira,Ednaldo L. de; Castro Neto,Pedro. The aim of this research was to evaluate the effects of different irrigation depths and potassium dosages, of Jatropha seed oil content and yield. The experimental design used was randomized blocks, in split-plots, with four replicates. The treatments were four water depths (plots) and four potassium dosages (subplots) applied through irrigation water. The water depths were applied based on the percentage of accumulated evaporation of a Class A (ECA) tank and of rainfall, as following: L0 = without irrigation, L40, L80 and L120, representing 40, 80 and 120% of the balance, respectively. The potassium dosages were K30, K60, K90 and K120 (30, 60, 90 and 120kg ha-1 of potassium, respectively). The oil extraction of samples was done through chemical extraction... Tipo: Info:eu-repo/semantics/article Palavras-chave: Chemical extraction; Biodiesel; Oilseed; Drip irrigation. Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000600010 Irrigation management in pruned coffee tree crop REA Custódio,Anselmo A. de P.; Faria,Manoel A. de; Rezende,Fátima C.; Morais,Augusto R. de; Leite Junior,Maurício C. R.. It was evaluated the effect of irrigation management on the production characteristics of coffee cultivar Acaiá MG-1474, planted in spacing of 3.00 m x 0.60 m, pruned in 2004, and irrigated by drip since the planting, in 1997. The experimental designed used was of randomized blocks with five treatments and four replications. The treatments consisted of irrigation management strategies, applying or not applying controlled moisture deficit in layer of 0 to 0.4m, in dry seasons of the year: A = no irrigation (control), B = irrigation during all year considering the factor of water availability in the soil (f) equal to 0.75, C = irrigation during all year considering f = 0.25, D = irrigation during all year, but in January /February /March /July /October... Tipo: Info:eu-repo/semantics/article Palavras-chave: Drip irrigation; Productivity; Coffee plantation; Coffea arabica L. Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000100007 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 METHODOLOGY FOR DIMENSIONING OF A CENTER PIVOT IRRIGATION SYSTEM OPERATING WITH DRIPPER TYPE EMITTER REA Almeida,Alex N. de; Coelho,Rubens D.; Costa,Jéfferson de O.; Farías,Asdrúbal J.. ABSTRACT: In Brazil, the conventional center pivot is widely used for irrigation of agricultural crops and its use has grown continuously. However, when improperly managed, it facilitates the development of diseases in all parts of the plant, with a direct effect on productivity, besides favoring losses of water by evaporation. The drip may be an alternative, since it minimizes the losses and does not wet the aerial parts of the plants, thereby reducing the incidence of diseases. A new system called localized mobile drip irrigation (IRGMO) is being developed in an attempt to combine the practicality and rusticity of the center pivot with the efficiency and water savings of the dripping irrigation systems. This fusion system is the central pivot with drip... Tipo: Info:eu-repo/semantics/article Palavras-chave: Design; Drip irrigation; Center pivot. Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000400828 Water application uniformity and fertigation in a dripping irrigation set REA Borssoi,Adilson L.; Vilas Boas,Marcio A.; Reisdörfer,Marcelo; Hernández,Ricardo H.; Follador,Franciele A. C.. The purpose of this study was to evaluate the uniformity of distribution coefficient (UDC) and coefficient of variation (CV) of a familiar set of irrigation, classifying it the ASAE standard. The irrigation and fertigation are determined by two methods the KELLER &amp; KARMELI and DENÍCULI . The two experiments were subjected to varying pressures: 12, 14, 16 and 18 kPa, in a completely randomized design of twenty samples composed of flows with three replications. Urea, potassium chloride (KCl) and ammonium phosphate (MAP) were the elements used for fertigation. The system consisted of a 200 L tank, which supplied another container of 30 L, it was moved vertically to control the pressure. The data was statistically compared between treatments for each... Tipo: Info:eu-repo/semantics/article Palavras-chave: Emitter; Hydraulic performance; Low head; Drip irrigation. Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000400011 Registros recuperados: 45 Primeira ... 1 2 3 ... Última

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