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Registros recuperados: 43
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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
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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
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Extending the integrated Richards Equation method to new boundary conditions: model description and validation Agrociencia
Yang,Dejun; Zhang,Tuqiao; Zhang,Kefeng; Lei,Shaogang.
There is a need for developing an accurate and simple method, which can be widely used in agro-hydrological models. The Integrated Richards Equation method is a good and simple method to simulate cyclic movement of water in the soil-atmosphere system. However, this method still has some unsolved problems and it is needed for further development if used in agro-hydrological simulation. In this study, the Integrated Richards Equation method was further developed for the agro-hydrological simulation by introducing the commonly used soil hydraulic functions, top and lower boundary conditions. Infiltration numerical experiments and a lab evaporation experiment were used for the validation of the model's capabilities of modelling infiltration and evaporation,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Evaporation; Agro-hydrological simulation; Infiltration; Integrated Richards Equation; Runoff; Soil water content.
Ano: 2015 URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952015000700002
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Replacing clean fallow with minimum tilled pulse legume in a subtropical dryland at Pothwar, Pakistán Agrociencia
Sohail-Ijaz,Shahzada; Ali,Safdar.
Clean fallowing has been criticized in the recent past due to the fact that it causes accelerated soil erosion, emission of CO2 to the atmosphere and reduction in farm income. In an effort to reduce fallowing in Pothwar, Pakistan, field experiments were carried out from 2005 through 2008 at three locations (Rawalpindi, Chakwal and Fateh Jang). The experimental design was split-plot and treatments were applied as follows: conventional cultivator, moldboard plow and minimum tillage in main plots; fallow, legume (mungbean, Vigna radiata) and mulch of wheat straw were used in sub plots. Wheat (Triticum aestivum) was planted in all the subplots during winter. All the treatment plots had equivalent volumetric water content at wheat planting. Consequently, the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fallow; Tillage; Mungbean; Soil water content; Wheat; Gross margins.
Ano: 2011 URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952011000100005
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Pore system changes of damaged Brazilian oxisols and nitosols induced by wet-dry cycles as seen in 2-D micromorphologic image analysis Anais da ABC (AABC)
Pires,Luiz F.; Reichardt,Klaus; Cooper,Miguel; Cássaro,Fabio A.M.; Dias,Nivea M.P.; Bacchi,Osny O.S..
Soil pore structure characterization using 2-D image analysis constitutes a simple method to obtain essential information related to soil porosity and pore size distribution (PSD). Such information is important to infer on soil quality, which is related to soil structure and transport processes inside the soil. Most of the time soils are submitted to wetting and drying cycles (W-D), which can cause important changes in soils with damaged structures. This report uses 2-D image analysis to evaluate possible modifications induced by W-D cycles on the structure of damaged soil samples. Samples of three tropical soils (Geric Ferralsol, GF; Eutric Nitosol, EN; and Rhodic Ferralsol, RF) were submitted to three treatments: 0WD, the control treatment in which...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil bulk density; Soil water content; Soil porosity; Micromorphology; Soil structure; Compaction.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000100016
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GPS receivers for georeferencing of spatial variability of soil attributes REA
Rosalen,David L; Rodrigues,Marcos S; Chioderoli,Carlos A; Brandão,Flavia J. C; Siqueira,Diego S.
The characterization of the spatial variability of soil attributes is essential to support agricultural practices in a sustainable manner. The use of geostatistics to characterize spatial variability of these attributes, such as soil resistance to penetration (RP) and gravimetric soil moisture (GM) is now usual practice in precision agriculture. The result of geostatistical analysis is dependent on the sample density and other factors according to the georeferencing methodology used. Thus, this study aimed to compare two methods of georeferencing to characterize the spatial variability of RP and GM as well as the spatial correlation of these variables. Sampling grid of 60 points spaced 20 m was used. For RP measurements, an electronic penetrometer was used...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Precision agriculture; GNSS; Compaction; Soil water content.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162011000600013
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Construction and calibration of TDR probes for volumetric water content estimation in a Distroferric Red Latosol REA
Soncela,Rosimaldo; Sampaio,Silvio C.; Vilas Boas,Marcio A.; Tavares,Maria H. F.; Smanhotto,Adriana.
The determination of volumetric water content of soils is an important factor in irrigation management. Among the indirect methods for estimating, the time-domain reflectometry (TDR) technique has received a significant attention. Like any other technique, it has advantages and disadvantages, but its greatest disadvantage is the need of calibration and high cost of acquisition. The main goal of this study was to establish a calibration model for the TDR equipment, Trase System Model 6050X1, to estimate the volumetric water content in a Distroferric Red Latosol. The calibration was carried out in a laboratory with disturbed soil samples under study, packed in PVC columns of a volume of 0.0078m³. The TDR probes were handcrafted with three rods and 0.20m...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Apparent dielectric constant; Time-domain reflectometry; Soil water content.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000500004
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Deficit irrigation in grapevine cv. Syrah during two growing seasons in the brazilian semiarid REA
Bassoi,Luís H.; Correia,Joselina de S.; Santos,Ana R. L. dos; Silva,Juliano A.; Costa,Bruno R. S..
Irrigation plays an important role for grape’s yield as well as on its quality for winemaking. Thus, the effects of deficit irrigation strategies on yield and quality of wine grapes cv. Syrah were evaluated in Petrolina, State of Pernambuco, Brazil. Evaluations were carried out throughout the second and third growing seasons, which were from November 2010 to February 2011 (rainy season) and from May to September 2011 (dry season), respectively. Vines were drip irrigated and the experimental design was completely randomized with three treatments and four replications. The treatments were full irrigation (FI), performed according crop evapotranspiration; regulated deficit irrigation (RDI), in which irrigation was interrupted in phenological growth stage of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Vitis vinifera L.; Soil water content; Leaf water potential.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162015000300430
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Variations on the expertise of two attributes of physical soil due to differences in the method of global satellite navigation REA
CRISTIANO,ZERBATO; COMPAGNON,ARIEL M.; VOLTARELLI,MURILO A.; ROSALEN,DAVID L.; FURLANI,CARLOS E. A..
ABSTRACT The mechanical resistance to penetration when related to the water content is an indicator often used of soil compaction, the use of positioning methods for greater accuracy of this review is important. In this context, this study aimed to determine the variability of positioning methods provided by GPS receivers to determine the spatial behavior of physical attributes related to soil compaction. The study area is located in the municipality of Jaboticabal, around the latitude 21º15’22”S and longitude 48º18’58”W, being characterized with a clayey Oxisol. The variables used as parameters of soil physical properties were the mechanical resistance to penetration and water content, using a sampling grid of 20 x 20 m, totaling 60 points. We used six...
Tipo: Info:eu-repo/semantics/article Palavras-chave: GPS; Penetrometer; Soil compaction; Soil water content.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000400696
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STATISTICAL CONTROL OF PROCESSES APLIED FOR PEANUT MECHANICAL DIGGING IN SOIL TEXTURAL CLASSES REA
Zerbato,Cristiano; Furlani,Carlos E. A.; Silva,Rouverson P. da; Voltarelli,Murilo A.; Santos,Adão F. Dos.
ABSTRACT The digging of peanut, which has the pod production in the subsurface, is directly affected by soil conditions, physical or environmental characteristics, at the time of operation and may be the cause of unwanted losses. Therefore, the quality of the operation is very important for minimizing these losses. Thus, this study aimed to evaluate the quality of mechanized digging operation of peanut according to three soil textural classes (Sandy, Medium and Loamy) and their water content conditions at operation through statistical process control. The experiment was conducted at three locations in the state of São Paulo, Brazil, under sampling scheme arranged in tracks and 40 sampling points for each textural class of soil, using the mechanical digging...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Arachis hypogaea L; Losses; Quality; Soil water content; Water content of the pods.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000200315
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Variação anual da disponibilidade de água em solos do tipo areia quartzosa vermelho-amarela. Infoteca-e
BAENA, A. R. C..
Tipo: Folhetos Palavras-chave: Conteúdo de água no solo; Umidade do Solo; Soil water content.
Ano: 1982 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/380938
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Mineralização de nitrogênio e biomassa microbiana em solos de mata de galeria: efeito do gradiente topográfico. Infoteca-e
PARRON, L. M.; BUSTAMANTE, M. M. da C.; PRADO, C. L. C..
RESUMO: A disponibilidade de nitrogênio (N) inorgânico para as plantas, geralmente, depende da taxa de mineralização da matéria orgânica. A biomassa microbiana, além de indicadora da qualidade do solo, está relacionada à disponibilização de nutrientes. Este trabalho objetivou determinar as taxas de mineralização líquida de N e o carbono da biomassa microbiana (CBM) em solos, em um gradiente topográfico de Mata de Galeria no Distrito Federal, por 12 meses. O gradiente comporta três comunidades florísticas: úmida (margem do córrego), intermediária e seca (borda da mata), nas quais a produção líquida de N inorgânico foi 81,5; 29,2 e 25,3 kg N ha (elevado a -1) ano (elevado a -1), respectivamente. A quantidade de N-NO3- disponível na comunidade úmida foi 0,69...
Tipo: Folhetos Palavras-chave: Microbial flora; Biomassa; Cerrado; Mineralização; Microbiologia do Solo; Nitrificação; Nitrogênio; População Microbiana; Solo; Umidade do Solo; Biomass; Nitrification; Mineralization; Nitrogen; Soil; Soil water content; Soil biology.
Ano: 2003 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/568114
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Manejo da agua do solo no cultivo da batata. Infoteca-e
OLIVEIRA, C. A. da S.; VALADAO, L. T..
Tipo: Folhetos Palavras-chave: Soil moisture; Batata; Manejo de Água; Irrigação; Umidade; Solanum Tuberosum; Solo; Irrigation; Potatoes; Soil water content.
Ano: 1997 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/758610
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Identification of large-seeded high-yielding diverse kabuli accessions in newly assembled Chickpea germplasm Open Agri
H.D. Upadhyaya.
Palavras-chave: Chickpeas; Germplasm; Early maturation; Genotypes; Agronomic characters; Fungi; Chlorophylls; Soil water content; Seed treatment; Grain legumes.
Ano: 2006 URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3180
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Extra-large Kabuli chickpea with high resistance to Fusarium wilt Open Agri
P.M. Gaur.
Palavras-chave: Chickpeas; Early maturation; Agronomic characters; Germplasm; Genotypes; Breeds (animals); Soil water content; Gene banks; Fungi; Grain legumes.
Ano: 2006 URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3182
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Development and adoption of improved chickpea varieties in Myanmar Open Agri
Than, A.M..
Palavras-chave: Chickpeas; On-farm research; Breeds (animals); Agricultural extension; Soil water content; Germplasm; Yields; Area; Weather hazards; Demand.
Ano: 2007 URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3333
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Climate prediction for sustainable production of rainfed groundnuts in sat: crop establishment risks in the Anantapur region Open Agri
S.M..
Palavras-chave: Groundnuts; Sowing date; Precipitation; Products; Cropping systems; Agroclimatic zones; Weather data; Soil water content; Yields; Crops.
Ano: 1999 URL: http://agropedia.iitk.ac.in/openaccess/?q=node/4214
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Effects of Soil Solarization on Pigeonpea and Chickpea Open Agri
Y.S..
Palavras-chave: Pigeonpeas; Chickpeas; Soil solarization; Genotypes; Soil water content; Soil sampling; Dry matter; Root nodulation; Rhizobium; Weeds.
Ano: 1988 URL: http://agropedia.iitk.ac.in/openaccess/?q=node/4075
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Field diagnosis of chickpea diseases and their control Open Agri
Y.L..
Palavras-chave: Chickpeas; Fungi; Phoma; Vegetative stage; Mycoplasma; Necrosis; Diseases; Sowing date; Soil water content; Fruits.
Ano: 1991 URL: http://agropedia.iitk.ac.in/openaccess/?q=node/4248
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ICC 4958 A Drought Resistant Chickpea Open Agri
Palavras-chave: Drought resistance; Genotypes; Weather hazards; Chickpeas; Segregation; Genetic soil types; Germplasm; Soil water content; Grain legumes; Tolerance.
Ano: 1992 URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3830
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