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A Stochastic Frontier Approach for Measuring Technical Efficiencies of Date Farms in Southern Tunisia AgEcon
Belloumi, Mounir; Matoussi, Mohamed Salah.
The main objective of this research is to compare estimates of technical efficiency obtained from the stochastic frontier approach for two samples of farmers of private and water user associations in the Nefzaoua Oases region (Tunisia), which are characterized by a severe scarcity of water and especially a high degree of salinity. Technical inefficiency effects are modeled as a function of farm-specific socioeconomic factors. Results suggest that both systems are technically inefficient. On average, the private system is found to be slightly more efficient than the associative one. Date yield could be explained mainly by four variables: water quantity applied per palm tree, labor per palm tree, phosphate per palm tree, and water salinity. Output...
Tipo: Journal Article Palavras-chave: Salinization; Private and GIC systems; Technical efficiency; Nefzaoua oases; Date production; Groundwater management; Farm Management; Productivity Analysis.
Ano: 2006 URL: http://purl.umn.edu/10221
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ALTERATIONS ON THE EVAPOTRANSPIRATION OF SUGARCANE CULTIVARS UNDER DISTINCT SALINITY LEVELS APPLIED IN THE FERTIGATION REA
Toledo,João V.; Zolnier,Sérgio; Silva,Thieres G. F. da; Boehringer,Davi; Steidle Neto,Antonio J..
ABSTRACT: The aim of this research was to evaluate the effect of distinct levels of salinity on the evapotranspiration of the RB867515, RB855453, RB92579 and RB928064 sugarcane cultivars. The evapotranspiration was monitored during daytime period under meteorological conditions influenced, mainly by cloud variations. The salinity values were established by addition of 0, 50, 100 and 150 mM of Sodium Chloride (NaCl) to the nutrient solution, which was applied by fertigation, in such way that the electrical conductivity (EC) of the leached solution was near 3, 6, 10 and 13 dS m−1, respectively. The increase of the NaCl concentration in the nutrient solution affected, significantly and in a linear manner, the evapotranspiration of all sugarcane cultivars,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Efficient water use; Saccharum officinarum; Saline stress; Salinization.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000500940
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Barium and sodium in sunflower plants cultivated in soil treated with wastes of drilling of oil well AGRIAMBI
Sampaio Junior,Jésus; Amaral,Nelson M. B. do; Zonta,Everaldo; Magalhães,Marcio O. L..
ABSTRACTThis study aimed to evaluate the effects of the application of two types of oil drilling wastes on the development and absorption of barium (Ba) and sodium (Na) by sunflower plants. The waste materials were generated during the drilling of the 7-MGP-98D-BA oil well, located in the state of Bahia, Brazil. The treatments consisted of: Control – without Ba application, comprising only its natural levels in the soil; Corrected control – with fertilization and without wastes; and the Ba doses of 300, 3000 and 6000 mg kg-1, which were equivalent to the applications of 16.6, 165.9 and 331.8 Mg ha-1 of waste from the dryer, and 2.6, 25.7 and 51.3 Mg ha-1 of waste from the centrifugal. Plants cultivated using the first dose of dryer waste and the second...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Heavy metals; Helliantus annus; Salinization.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015001101100
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Characterization and pedogenesis of mangrove soils from Ilhéus-BA, Brazil Rev. Ciênc. Agron.
Gomes,Felipe Haenel; Ker,João Carlos; Ferreira,Tiago Osório; Moreau,Ana Maria Souza dos Santos; Moreau,Maurício Santana.
ABSTRACT Despite its importance, studies of mangrove soils are scarce, especially from a pedological perspective. The objective of this work was to study the genesis of soils in a mangrove environment in northeastern Brazil (Ilhéus, Bahia) through a morphological, physical, chemical and mineralogical characterization. All soils presented a sandy texture, which is related to the parent material (Quaternary sand deposits). The tidal flooding and resulting hydromorphic conditions is responsible for dominance of dark grey colors, and high organic matter contents (paludization process). As well as the high values of electrical conductivity (EC) and dominance of Na+ in the saturation extract (salinization and solodization processes, respectively). Contrastingly,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mangrove ecosystem; Sulfidization; Paludization; Salinization; Solodization; Soil organic fractions.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902016000400599
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Efeito da irrigacao e adubacao sobre algumas caracteristicas quimicas de um vertissolo. Repositório Alice
PEREIRA, J. R.; CORDEIRO, G. G..
Em um Vertissolo, cultivado com videira, avaliou-se o efeito da irrigacao e da adubacao NPK aplicadas naulamente, durante 17 anos, sobre algumas caracteristicas quimicas do solo. O sistema de irrigacao foi em bacia de infiltracao, onde tambem foram aplicados os fertilizantes e incorporados ao solo ate a profundidade de 5 cm. A amostragem do solo foi feite em 18 pontos da area cultivada e em sete pontos da area de solo virgem, em torno do parreiral, as profundidades de 0-15 cm, 15-30 cm, 30-60 cm, 60-90 cm e 90-120 cm. Os resultados analiticos mostraram que praticamente nao ocorreram variacoes perceptiveis nos teores de Ca2+, Mg2+ e Na+ trocaveis, materia organica, N-HN4+ e Zn, em relacao ao solo virgem, em resposta aos tratamentos. Quanto aos outros...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Irrigacao; Solo; Adubacao; Manejo; Salinizacao; Solo calcario; Produtividade; Condutividade eletrica; Irrigation; Soils; Fertility; Management; Salinization; Calcareous soils; Productivity; Electrical conductivity; Irrigação; Irrigation.
Ano: 1987 URL: http://www.alice.cnptia.embrapa.br/handle/doc/132822
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Growth of young Tabebuia aurea seedlings under irrigation with wastewater from fish farming AGRIAMBI
Pinto,José R. de S.; Freitas,Rômulo M. O. de; Leite,Tiago de S.; Oliveira,Francisco de A. de; Ferreira,Hugo; Leite,Moadir de S..
ABSTRACT This study aimed to evaluate the growth of young Tabebuia aurea seedlings irrigated with different concentrations of wastewater from fish farming. The experiment was conducted in a seedling nursery, from June to August 2013. The treatments consisted of five concentrations of wastewater from fish farming diluted in freshwater (0, 25, 50, 75 and 100% of wastewater). Plant height, stem diameter and plant height/stem diameter ratio were evaluated every 15 days to verify the effects of treatments on seedlings growth. At the end of the experiment, individual leaf area, leaf area, leaf dry matter, stem dry matter, root dry matter, total dry matter and Dickson quality index were also evaluated. The reuse of wastewater from fish farming diluted at...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Water reuse; Seedling production; Salinization; Reforestation.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000600519
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Herbaceous biomass yield in the saline soils during the dry and rainy seasons in the municipality of Pentecoste, CE, Brazil Ciência Rural
Dias,Francisco Yago Elias de Castro; Bonilla,Oriel Herrera; Lucena,Eliseu Marlônio Pereira de; Lacerda,Claudivan Ferreira de; Oliveira,Daniel Pereira de; Oliveira,Davi Rodrigues.
ABSTRACT: This study was an endeavor undertaken to assess the biomass yield of the species that are native to a particular region characterized by saline soil, in the Irrigated Perimeter Curu-Pentecoste, in the municipality of Pentecoste-CE, corresponding to the qualities of moisture, pH and electrical conductivity (EC) of the soil. The experiment was conducted in six areas, with area 1, the one nearest to the collecting drain, the end having the highest salinity and area 6, the one furthest away from the collecting drain, the end with the lowest salinity. The factorial design with the 2 x 6 scheme was adopted, in which the first and second factors referred, respectively, to the seasons (drought and rain collection) and collection areas. In each area,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Phytomass; Halophytes; Salinization.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782020000300251
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Hydrochemistry of alluvial aquifer in the Cobra River sub-basin AGRIAMBI
Lima,Alexandre de O.; Dias,Nildo da S.; Lima Filho,Francisco P.; Ferreira Neto,Miguel; Rego,Priscila R. do A.; Souza,Anderson de M..
ABSTRACT The regional characteristics of waters from alluvial aquifers are different, since they depend on geology and climate. Also, there may be local variation in the quality of the available water when the water source is superficial (rivers and lakes) or is underground due to geology. In order to investigate the groundwater quality of the alluvial aquifer in the Sub-Basin of the Cobra River (RN) for construction of underground dams, five wells, four in the main river and one in the tributary, were monitored in dry and rainy seasons, during two hydrological years. Fifteen water samples from ‘Amazonas’ wells were collected for hydrochemical assessment. Multivariate analysis were performed to evaluate the origin of aquifer recharge and water...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Water quality; Salinization; Environmental impacts.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017001100785
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Salt accumulation and distribution in a greenhouse soil as affected by salinity of irrigation water and leaching management AGRIAMBI
Blanco,Flávio F.; Folegatti,Marcos V..
The effects of irrigation water salinity, leaching fraction and its frequency of application on soil salinization were studied. Three water salinities (S1=1.54, S2=3.10 and S3=5.20 dS m-1) and two irrigation water depths associated with their application frequencies (W1=1.00 ETc; W2F1=1.25 ETc in all irrigations and W2F2=1.25 ETc when the irrigation water depth of W1 reached 100 mm where ETc is the crop evapotranspiration), were applied during the growing period of a grafted-cucumber crop in a greenhouse. The experimental design consisted of randomized blocks of 3 x 3 factorial scheme with 3 replications. Soil salinity at 0.1, 0.3 and 0.5 m depths increased linearly with salinity levels of water and the leaching fraction did not have any effect regardless...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Salinization; Leaching fraction; Leaching frequency.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662002000300006
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SODIUM PHYTOREMEDIATION BY GREEN MANURE GROWING IN SOIL IRRIGATED WITH WASTEWATER OF DAIRY INDUSTRY REA
Donatti,Ramon N.; Gomes,Tamara M.; Menegassi,Luana C.; Tommaso,Giovana; Rossi,Fabrício.
ABSTRACT: Phytoremediation is a technique that uses plants to decontaminate soils containing harmful organic and inorganic elements. The aim of this study was to evaluate the potential of three species of forage green manure in phytoremediation of saline soil irrigated with treated effluent from dairy processing plant. The design used was randomized blocks (3×3) with four replicates. The treatments were three different water sources (anaerobic treated effluent, aerobic treated effluent, and tap water) applied to growing table beets combined with the post-cultivation of three forage green manure: Calopogonium mucunoides Desv (Calopo), Cajanus cajan (L.) Millsp (Pigeon pea), and Pennisetum glaucum (L.) R. Brown (Millet). The treatment with Millet had higher...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Reuse water; Phytoextraction; Salinization.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000400665
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Variability of Soil Types in Wetland Meadows in the South of the Chilean Patagonia Chilean J. Agric. Res.
Filipová,Ladislava; Hédl,Radim; Covacevich C.,Nilo.
The wetland meadows and pastures (vegas) of the agricultural zone of the Magallanes Region and the Chilean Patagonia are productive and intensively exploited ecosystems. However, there is scarce data about the typology and the physical and chemical properties of the soils that determine the agricultural potential of vegas sites. Sampling of the main horizons of 47 soil profiles was conducted throughout the area. The profiles were described in the field and consequently classified according to the soil typology system of the WRB (IUSS Working Group WRB, 2006). Analyses of bulk and particle densities, capillary water capacity, pH (H2O), pH (CaCl2), texture, organic material, C:N ratio, electrical conductivity, effective cation exchange capacity, N, P,...
Tipo: Journal article Palavras-chave: Histosols; Fluvisols; Peat; Soil properties; Salinization; Soil degradation.
Ano: 2010 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000200010
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Zeta potential and electrophoretic mobility for the recovery of a saline soil with organic amendments Ciência e Agrotecnologia
Méndez,Judith Prieto; García,Francisco Prieto; González,Nallely Trejo; Santillán,Yolanda Marmolejo; Sandoval,Otilio Arturo Acevedo.
ABSTRACT The accumulation of salts in the soil profile produces conditions that affect the growth of crops. The effects of these conditions on crops and the intensity of these effects depend on the quantity and type of salts that predominate and are also influenced by soil characteristics and climate, among other aspects. The salinization of agricultural soils is a serious problem facing agriculture today. The use of organic amendments has increased in recent years, acting on the texture of the soil, correcting compaction or granularity problems, and influencing chemical and/or biological reactions. The objectives of this work were to analyze the use of compost and vermicompost using different analysis techniques to determine the influence of conditions on...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Salinization; Remediation; Vermicompost.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542018000400420
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