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			Ordenar por:  Relevância Autor Título Ano Registros recuperados: 158 Primeira ... 1 2 3 4 5 6 7 8 ... Última ผลของการจัดการน้ำต่อการปล่อยก๊าซมีเทนในนาข้าวศูนย์วิจัยข้าวลพบุรี Thai Agricultural Arthit Kukam-oo; Naiyakon Sa-ngwnkaew; Kritkamol Paothong; Perapol Ratana. Effect of water management to emission methane gas in Lopburi Rice Research Center dry season in 2014. Under Development of Alternative Technologies for Greenhouse Gas Emission Reduction and Information System for Decision Support of Policy Maker Project was experimental by Randomized Complete Block (RCB) 3 Replications to compare greenhouse gas emission from 3 Alternative Wet and Dry (AWD) with -10, -15, -20 cm water level and continuous irrigation method. Results showed that Lopburi Rice Research Center was sandy loam soil and AWD irrigation with -10 to -20 cm water level was 27 – 31 % water saving with comparative continuous irrigation method. AWD irrigation with -15 cm water level drainage tended to be best practice with minimum emission and water... Tipo: Collection Palavras-chave: Water management; Greenhouse gas emission; Rice production; Lopburi province; Methane emission; การจัดการน้ำ; การเกิดก๊าซเรือนกระจก; การผลิตข้าว; จังหวัดลพบุรี; การปล่อยก๊าซมีเทน. Ano: 2015 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5944 Factors influencing the decline of traditional cross-stream earthen weir (Thamnop) irrigation in northeast Thailand: Comparison of a still-functioning and an abandoned thamnop in two villages in Surin province Thai Agricultural Prapatsorn Wongsalee; Rambo, A. Terry; Fukui Hayao; Arunee Promkhambut. Earthen weir (thamnop) irrigation of rice fields was formerly widespread in Northeast Thailand (Isan) but has greatly declined in recent years, although still persisting in some places in southern Isan. The objective of this research was to discover if there are differences in the contexts of existing and abandoned of thamnop that may explain their retention or abandonment. Field study employing participation observation and interviewing of key informants and samples of farmer households was done in two villages in Surin province. One village has a still-functioning thamnop, the other has an abandoned one. Both physical and social factors were found to differ among the two cases. The existing thamnop is located at the midpoint between the uplands and... Tipo: PhysicalObject Palavras-chave: Cross-stream earthen weir; Thamnop; Irrigation; Water management; Indigenous knowledge; Abandoned thamnop; Function; Rice cultivation; Surin province; Northeast; ทำนบ; การเก็บน้ำ; การจัดการน้ำ; ระบบชลประทาน; ภูมิปัญญาชาวบ้าน; การใช้งาน; การปลูกข้าว; จ.สุรินทร์; ภาคตะวันออกเฉียงเหนือ. Ano: 2013 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5814 การตอบสนองของพันธุ์ข้าวไทยต่อระบบนาน้ำน้อย Thai Agricultural Nednapa Insalud; Supasit Sitthapanit; Jessada Phattaralerpong; Benjavan Rerkasem. The development of a water saving rice growing system was stemmed from an attempt to manage efficient water usage, whereby reducing level of water use but still maintaining acceptable level of yield. To be successful in implementing the water saving rice growing system, it is necessary to understand a suitable photosynthetic mechanism and photosynthetic efficiency of each rice cultivar to be grown in such system. An understanding of such knowledge will lead to a better selection of healthy and high yielding cultivars. As such, this study was aimed to compare responses of 10 Thai rice cultivars in terms of photosynthesis rate and growth in well-drained and water-logged systems. Our data indicated that almost all rice cultivars grown under either... Tipo: Collection Palavras-chave: Plant growth; Photo response; Photosynthesis; Rice; Water management; Water saving system; ข้าว; การตอบสนองต่อแสง; การสังเคราะห์แสง; การเจริญเติบโต; การจัดการน้ำ; ระบบนาน้ำน้อย. Ano: 2012 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5378 Water management improvements for agriculture by applying efficient crop schedules in the highland forest of Vilcabamba, Peru CIGR Journal Meseth, Enrique; Yu, Jason C.S.. The current work is aimed to improve the water management for agriculture, by applying efficient crop schedules in Vilcabamba -and similar areas of the Andean highland forest-, which can satisfy most of the water requirements with rainfed irrigation and maximise the crops yield.  For this purpose, two field practices were carried out during the dry (September 2012) and wet season (February 2013) to measure rivers and canals flows with the velocity/area method.  Nineteen soil samples were collected on-site and analysed, presenting prevalent sandy loam and loam textures.  Cropwat programme and data on climate, crops and soil were used to estimate crop water requirements and scheme irrigation requirements, indicating that crop evapotranspiration is low due to... Tipo: Info:eu-repo/semantics/article Palavras-chave: Water management; Irrigation requirements Crop scheduling crop water requirements rainfed irrigation water management for agriculture Cropwat. Ano: 2014 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2750 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 Proposing an Appropriate Soil Water Content Estimation Technique for Iran CIGR Journal Karimi, Hadi; Ghassemzadeh, Hamid Reza; Pashaee, Payam; Zarei Shahamat, Ebrahim. Limitation of water resources is one of the major factors in the agricultural development of Iran. In recent years. Iran suffers from increases water consumption and drought conditions, This is why efficient water management in agriculture production becomes an inevitable requirement. One of the main aspects of water management in agriculture production is operating any type of irrigation system efficiently. A good on-farm irrigation water management requires a routine monitoring of soil water content (SWC). Recently a substantial number of different experimental methods in categories of direct, indirect, ground based and remote sensing have been developed to determine the SWC, and a large body of knowledge is now available on theory and applications. The... Tipo: Info:eu-repo/semantics/article Palavras-chave: Iran; Water management; Soil water content; Water estimation technique. Ano: 2015 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3054 Evaluation of chloride mass balance and recharge in agricultural lands in Nigeria CIGR Journal Sobowale, A; Ramalan, A A; Mudiare, O J; Oyebode, M A. Groundwater salinization studies and recharge estimation was carried out at the Irrigation Research Station, Kadawa, Nigeria. Groundwater samples from fifteen randomly selected piezometer locations were analyzed monthly for chloride using Mohr’s method for three years while recharge was estimated using the chloride mass balance (CMB) method. Groundwater chloride range from 22 - 91.4 mg/l, seasonal trend was identified with the hot dry season (April – June) having higher values than the wet season (July – October). Correlation analysis revealed chloride status that is not associated with one another in all soil types while salt build up was observed at the south western tip of the farmland indicating potential reduction of agricultural productivity. CMB... Tipo: Info:eu-repo/semantics/article Palavras-chave: Groundwater Hydrology and irrigation irrigation; Groundwater; Chloride mass; Recharge; Water management; Salinity. Ano: 2015 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3213 Evaluation of chloride mass balance and recharge in agricultural lands in Nigeria CIGR Journal A Sobowale; Department of Agricultural and Bio-Resources Engineering, Federal University of Agriculture, Abeokuta, Nigeria; A A Ramalan; O J Mudiare; M A Oyebode. Groundwater salinization studies and recharge estimation was carried out at the Irrigation Research Station, Kadawa, Nigeria. Groundwater samples from fifteen randomly selected piezometer locations were analyzed monthly for chloride using Mohr’s method for three years while recharge was estimated using the chloride mass balance (CMB) method. Groundwater chloride range from 22 - 91.4 mg/l, seasonal trend was identified with the hot dry season (April – June) having higher values than the wet season (July – October). Correlation analysis revealed chloride status that is not associated with one another in all soil types while salt build up was observed at the south western tip of the farmland indicating potential reduction of agricultural productivity. CMB... Palavras-chave: Groundwater Hydrology and irrigation irrigation; Groundwater; Chloride mass; Recharge; Water management; Salinity. Ano: 2015 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3213 Proposing an Appropriate Soil Water Content Estimation Technique for Iran CIGR Journal Hadi Karimi; University of Tabriz; Hamid Reza Ghassemzadeh; University of Tabriz; Payam Pashaee; University of Tabriz; Ebrahim Zarei Shahamat; University of Tabriz. Limitation of water resources is one of the major factors in the agricultural development of Iran. In recent years. Iran suffers from increases water consumption and drought conditions, This is why efficient water management in agriculture production becomes an inevitable requirement. One of the main aspects of water management in agriculture production is operating any type of irrigation system efficiently. A good on-farm irrigation water management requires a routine monitoring of soil water content (SWC). Recently a substantial number of different experimental methods in categories of direct, indirect, ground based and remote sensing have been developed to determine the SWC, and a large body of knowledge is now available on theory and applications. The... Palavras-chave: Iran; Water management; Soil water content; Water estimation technique. Ano: 2015 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3054 Water management improvements for agriculture by applying efficient crop schedules in the highland forest of Vilcabamba, Peru CIGR Journal Enrique Meseth; National Sun Yat-Sen University; Jason C.S. Yu; National Sun Yat-Sen University, Department of Marine Environment and Engineering, Lien-Hai Road 70, 80424 Kaohsiung, Taiwan. The current work is aimed to improve the water management for agriculture, by applying efficient crop schedules in Vilcabamba -and similar areas of the Andean highland forest-, which can satisfy most of the water requirements with rainfed irrigation and maximise the crops yield.  For this purpose, two field practices were carried out during the dry (September 2012) and wet season (February 2013) to measure rivers and canals flows with the velocity/area method.  Nineteen soil samples were collected on-site and analysed, presenting prevalent sandy loam and loam textures.  Cropwat programme and data on climate, crops and soil were used to estimate crop water requirements and scheme irrigation requirements, indicating that crop evapotranspiration is low due to... Palavras-chave: Water management; Irrigation requirements Crop scheduling crop water requirements rainfed irrigation water management for agriculture Cropwat. Ano: 2014 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2750 Effects of riparian vegetation on the structure of the marginal aquatic habitat and the associated fish assemblage in a tropical Brazilian reservoir Biota Neotropica Beltrão,Gabriel de Barros Moreira; Medeiros,Elvio Sergio Figueredo; Ramos,Robson Tamar da Costa. Riparian zones represent areas of strong biological, physical and chemical interaction between terrestrial and aquatic ecosystems. These areas are usually typified by high diversity of fauna, flora and environmental processes. The present study evaluates the littoral habitat structure and its fish fauna related to associations between presence and absence of natural riparian vegetal cover, in a reservoir in northeastern Brazil. Sampling was performed on marginal areas where riparian vegetation was present and where it had been removed for the plantation of sugar cane. For each type of marginal area three replicate sites were sampled during the wet season. Data on the habitat structure (submerged elements and substrate composition), fish and water quality... Tipo: Info:eu-repo/semantics/article Palavras-chave: Riparian zone; Habitat structure; Water management; Conservation. Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032009000400003 Root growth and distribution in sugarcane cultivars fertigated by a subsurface drip system Bragantia Ohashi,Augusto Yukitaka Pessinatti; Pires,Regina Célia de Matos; Ribeiro,Rafael Vasconcelos; Silva,André Luiz Barros de Oliveira. Despite of the agronomic importance for water management, few studies of sugarcane roots have been performed under field conditions during the crop cycle. The aim of this study was to determine the cumulative root density (LA), root distribution on soil profile and the effective rooting depth (ERD) for three sugarcane cultivars using the minirhizotron method. A field experiment was done with sugarcane cultivars IACSP94-2094, IACSP94-2101 and SP79-1011 grown under subsurface drip fertigation. Soil chemical and physical characteristics were also evaluated. Root evaluations were taken at 38, 58, 123, 185 and 205 days during the second ratoon, considering the soil profile until 0.8 m depth. The highest LA and root growth rates were found up to 0.4 m soil layer... Tipo: Info:eu-repo/semantics/article Palavras-chave: Saccharum spp.; Irrigation; Water management; Effective rooting depth; Root growth rate. Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052015000200131 Irrigation management methods for the production of bell pepper in agricultural substrates Bragantia Santos,Irai Manuela Santana; Santos Júnior,Pedro Pereira; Silva,Rodrigo Rafael da; Oliveira,Gertrudes Macário de; Queiroz,Sérgio Oliveira Pinto de. ABSTRACT This study’s objective was to assess the response and effectiveness of irrigation management systems for the production of bell pepper with different agricultural substrates, under protected conditions. The current study was conducted in a greenhouse located in Juazeiro, BA, in the northwest of Brazil. The experiment design was completely randomized in a split-plot system, with two irrigation treatments as the main plots (the drainage lysimeter and the Piché evaporimeter) and two substrates in each sub-plot (coconut fiber and pinus bark), with 5 replications per treatment. Harvest was conducted from 86 to 151 days after transplanting, and the following characteristics were evaluated: total, marketable and unmarketable yields, production per plant,... Tipo: Info:eu-repo/semantics/article Palavras-chave: Capsicum annuum; Water management; Evapotranspiration. Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052018000300510 Production flush of Agaricus blazei on Brazilian casing layers BJM Colauto,Nelson Barros; Silveira,Adriano Reis da; Eira,Augusto Ferreira da; Linde,Giani Andrea. This study aimed to verify the biological efficiency and production flushes of Agaricus blazei strains on different casing layers during 90 cultivation days. Four casing layers were used: mixture of subsoil and charcoal (VCS), lime schist (LSC), São Paulo peat (SPP) and Santa Catarina peat (SCP); and two genetically distant A. blazei strains. The fungus was grown in composted substratum and, after total colonization, a pasteurized casing layer was added over the substratum, and fructification was induced. Mushrooms were picked up daily when the basidiocarp veil was stretched, but before the lamella were exposed. The biological efficiency (BE) was determined by the fresh basidiocarp mass divided by the substratum dry mass, expressed in percentage. The... Tipo: Info:eu-repo/semantics/article Palavras-chave: Production flush; Agaricus brasiliensis; Casing layer; Water management; Agaricus subrufescens. Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000200026 Institutional Aspects of Sustainability for Irrigated Agriculture in Arid and Semi-Arid Regions Chilean J. Agric. Res. del Callejo,Iván; Cossío,Vladimir. Concerns, arguments, and approaches to sustainability are exposed in both scientific and technical irrigation literature which is based on the priority of food production and water preservation as a basic resource. Different approaches related to sustainable irrigated agriculture are identified beyond the technical considerations of irrigation as dealt with by very specialized scientific literature. These focus on socio-economic and institutional aspects of irrigation management. In this chapter, four main approaches are discussed: “New institutionalism” is an approach which emphasizes economic and financial issues such as cost recovery and the role of the market in water rights reallocation. A second approach, “Common pool resources management” highlights... Tipo: Journal article Palavras-chave: Institutional approaches; Irrigation institutions; Water management; Sustainable irrigation. Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000500005 Design and Management of Irrigation Systems Chilean J. Agric. Res. Holzapfel,Eduardo A; Pannunzio,Alejandro; Lorite,Ignacio; Silva de Oliveira,Aureo; Farkas,István. Irrigation systems should be a relevant agent to give solutions to the increasing demand of food, and to the development, sustainability and productivity of the agricultural sector. The design, managing, and operation of irrigation systems are crucial factors to achieve an efficient use of the water resources and the success in the production of crops and orchards. The aim of this paper is to analyze knowledge and investigations that enable to identify the principal criteria and processes that allow improving the design and managing of the irrigation systems, based on the basic concept that they facilitate to develop agriculture more efficient and sustainable. The design and managing of irrigation systems must have its base in criteria that are relevant,... Tipo: Journal article Palavras-chave: Irrigation; Design; Water management; Operation systems. Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000500003 Heuristic methods applied in reference evapotranspiration modeling Ciência e Agrotecnologia Althoff,Daniel; Bazame,Helizani Couto; Filgueiras,Roberto; Dias,Santos Henrique Brant. ABSTRACT The importance of the precise estimation of evapotranspiration is directly related to sustainable water usage. Since agriculture represents 70% of Brazil’s water consumption, adequate and efficient application of water may reduce the conflicts over the use of water among the multiple users. Considering the importance of accurate estimation of evapotranspiration, the objective of the present study was to model and compare the reference evapotranspiration from different heuristic methodologies. The standard Penman-Monteith method was used as reference for evapotranspiration, however, to evaluate the heuristic methodologies with scarce data, two widely known methods had their performances assessed in relation to Penman-Monteith. The methods used to... Tipo: Info:eu-repo/semantics/article Palavras-chave: Machine learning; Model comparison; Water management. Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542018000300314 Effect of different levels of water deficit on rapeseed (Brassica napus L.) crop Ciência e Agrotecnologia Bilibio,Carolina; Carvalho,Jacinto de Assunção; Hensel,Oliver; Richter,Uwe. Effects of different levels of water deficit applied during rapeseed crop development were assessed in a trial with metallic pots in greenhouse at the Department of Agricultural Engineering of Kassel University, Witzenhausen, Germany. A randomized block design was used with one cultivar (Ability Summer Rape) and three levels of water deficit (0, 30, and 60% of evapotranspiration) in three treatments and 20 replicates. Irrigation management was carried out through daily water balance, where ET = I - D; ET: evapotranspiration; I: irrigation; and D: drainage. The following evaluations were carried out weekly: stem diameter (mm); plant height (cm); number of leaves; number of branches and number of pods. At the end of the experiment, assessed total green... Tipo: Info:eu-repo/semantics/article Palavras-chave: Water management; Irrigation; Water deficit. Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542011000400005 Registros recuperados: 158 Primeira ... 1 2 3 4 5 6 7 8 ... Última

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