Relação entre solos afetados por sais e concentração de metais pesados em quatro perímetros irrigados no Ceará

Cunha, Cleyton Saialy Medeiros; Hernández, Fernando Felipe Ferreyra; Silva, Francisco N. da; Escobar, Maria Eugenia Ortiz; Magalhães, Diego R.; Anjos, David Correia dos

doi:10.1590/1807-1929/agriambi.v18nsupps80-s85

Cited by 7 publications

(4 citation statements)

References 16 publications

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“…A salinização das áreas irrigadas é um problema crescente em maior parte do mundo, sobretudo nas regiões de clima árido e semi-árido onde a precipitação de chuvas não é suficiente para a lavagem dos sais na zona radicular (Costa, 2007) e os sais solúveis se precipitam na superfície ou no interior do solo (Cunha et al, 2014).…”

Section: Contextualização Teóricaunclassified

Risco de Salinização dos Solos das Áreas Irrigadas ao Longo do Rio Montepuez / Risk of Salinization of Soils in Irrigated Areas Along the Montepuez River

Saibo¹,

Ibraimo²

2022

BJDV

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A salinização dos solos é um problema frequente nas áreas irrigadas das regiões áridas e semi-áridas. No Distrito de Montepuez ao longo das margens do rio Montepuez, a produção de hortícolas com recuso a água do Rio Montepuez tem sido feita sem o conhecimento prévio da composição físico-química da água e do solo. Desta feita, a pesquisa objetivou analisar o risco de salinização dos solos das áreas irrigadas ao longo do Rio Montepuez, no Bairro de Muica. Para tal, foi analisada a composição fico-química do solo, a qualidade da água e foram descritas as práticas de irrigação com recurso a entrevista estruturada. Para análise da composição físico-química do solo foram coletadas amostras simples de nove pontos e em duas profundidades (0 a 20 cm e 20 a 40 cm). Para analise da qualidade de água foram coletadas duas amostras nos pontos de tomada água. O local estudado é caracterizado por: prática de rega por bacias de inundação com recurso a uma moto-bomba os solos de textura media apresentam dificuldades de drenagem a água usada para irrigação apresenta EC alta e um pH neutro tendendo para alcalinidade. Com tais condições, conclui-se que a área apresenta risco de salinização dos solos.

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Section: Contextualização Teóricaunclassified

Risco de Salinização dos Solos das Áreas Irrigadas ao Longo do Rio Montepuez / Risk of Salinization of Soils in Irrigated Areas Along the Montepuez River

Saibo¹,

Ibraimo²

2022

BJDV

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“…The pH range considered adequate for the use of water in irrigation is between 6.5 and 8.4. pH values above or below these limits may result in equipment corrosion and may cause precipitation of some salts, which interferes in the water-soilplant relationship (Cunha, et al, 2014).…”

Section: Ph Analysismentioning

confidence: 99%

Water for irrigation at the Antônio Conselheiro settlement, Mato Grosso, Brazil

Silva

Queiróz

2022

RSD

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Irrigation is an essential technology for the increase in productivity, improvement of quality of produce, increase in producers’ income, and the good quality of water is fundamental for the success of those benefits. The presence of salts in high concentrations may cause salinization of the soil, toxicity in plants and damage to irrigation equipment, such as sprinkler clogging, which causes environmental and economic losses. This study aimed at characterizing and classifying the quality of water for irrigation in the Antônio Conselheiro Settlement (AAC, in Portuguese) area, located in the state of Mato Grosso, Brazil. Samples were monthly collected from the main water sources in the area, the Sepotuba and Juba rivers, and Tarumã creek, from October 2014 to September 2015. The assessed variables were bicarbonate, calcium, chlorides, electric conductivity, magnesium, pH, and sodium. The results were compared with the parameters established in the literature and were used to classify the waters by means of the Piper diagram and the United States Salinity Laboratory (USSL) diagram. Out of the assessed variables, only electric conductivity, pH and SAR presented restrictions to use in irrigation. The Piper diagram classification indicates the presence of chloride sodic waters (59%), bicarbonate sodic waters (38%), and mixed chloride waters (3%). Good or excellent waters were found in 88.2%. Therefore, the water available in the AAC area, in surface and underground sources, may be used in sprinkler and localized irrigation systems without major harm to the soil or to the crops.

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“…Fluvent soils, found in 70% of the irrigated area, were selected for sample collection. These alluvial soils have a texture with typical values of 39% of sand, 33% of silt and 28% of clay [22]. At one specific site of exposed soil (S 5°07'08'' and W 38°16'35"; the yellow polygon in Figure 1), 180 samples were collected at a depth of 0 to 15 cm.…”

Section: Soil Sample Collectionmentioning

confidence: 99%

Laboratory Salinization of Brazilian Alluvial Soils and the Spectral Effects of Gypsum

2014

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Irrigation-induced salinization is an important land degradation process that affects crop yield in the Brazilian semi-arid region, and gypsum has been used as a corrective measure for saline soils. Fluvent soil samples (180) were treated with increasing levels of salinization of NaCl, MgCl 2 and CaCl 2 . The salinity was gauged using electrical conductivity (EC). Gypsum was added to one split of these samples before they were treated by the saline solutions. Laboratory reflectance spectra were measured at nadir under a controlled environment using a FieldSpec spectrometer, a 250-W halogen lamp and a Spectralon panel. Variations in spectral reflectance and brightness were evaluated using principal component analysis, as well as the continuum-removed absorption depths of major features at 1450, 1950, 1750 and 2200 nm for both the gypsum-treated (TG) and non-treated (NTG) air-dried soil samples as a function of EC. Pearson's correlation coefficients of reflectance and the band depth with EC were also obtained to establish the relationships with salinity. Results showed that NTG samples presented a decrease in reflectance and brightness with increasing CaCl 2 and MgCl 2 salinization. The reverse was observed for NaCl. Gypsum increased the spectral reflectance of the soil. The best negative correlations between reflectance and EC were observed in the 1500-2400 nm range for CaCl 2 and MgCl 2 , probably because these wavelengths are most affected by water absorption, as Ca and Mg are much more hygroscopic than Na. These decreased after chemical treatment with gypsum. The most prominent features were observed at 1450, OPEN ACCESSRemote Sens. 2014, 6 2648 1950 and 1750 nm in salinized-soil spectra. The 2200-nm clay mineral absorption band depth was inversely correlated with salt concentration. From these features, only the 1750 and 2200 nm ones are within atmospheric absorption windows and can be more easily measured using hyperspectral sensors.

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Relação entre solos afetados por sais e concentração de metais pesados em quatro perímetros irrigados no Ceará

Cited by 7 publications

References 16 publications

Risco de Salinização dos Solos das Áreas Irrigadas ao Longo do Rio Montepuez / Risk of Salinization of Soils in Irrigated Areas Along the Montepuez River

Risco de Salinização dos Solos das Áreas Irrigadas ao Longo do Rio Montepuez / Risk of Salinization of Soils in Irrigated Areas Along the Montepuez River

Water for irrigation at the Antônio Conselheiro settlement, Mato Grosso, Brazil

Laboratory Salinization of Brazilian Alluvial Soils and the Spectral Effects of Gypsum

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