Soil Extractant
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. Organic Matter Leached from Tropical Soils by Simulated Rain, Hard (NaOH) and Soft (NaNO3) Extractions: A Realistic Study about Risk Assessment in Soils
Alkaline extractions from humic material are used to risk assessment in soils. However, there are questions about the type of extraction most suitable for this evaluation. Thus, this work evaluated different soil extractions in search of realistic environmental conditions (simulated rain). The parameters obtained revealed significant differences between the
J. Braz. Chem. Soc.. Publicado em: 2021-03
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2. Soil-applied Zn effect on soil fractions
ABSTRACT The interaction of Zn with soil compartments influences its bioavailability and uptake by plants. In this study, rice and soybean were cultivated under greenhouse conditions with the aim of evaluating Zn bioavailability and fractionation in a clayey-textured Typic Hapludox as a function of Zn rates (4 or 8 mg kg –1 Zn). The experiment was conducte
Sci. agric. (Piracicaba, Braz.). Publicado em: 02/09/2019
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3. Application of Solvent Demulsification-Dispersive Liquid-Liquid Microextraction Based on Solidification of Floating Organic Drop Coupled with High Perfomence Liquid Chromatography in Determination of Sulfonylurea Herbicides in Water and Soil
A method for simultaneous determination of nine sulfonylurea herbicides in water and soil samples with solvent demulsification-dispersive liquid-liquid microextraction based on solidification of floating organic drop coupled with high perfomence liquid chromatography was established. 120 µL of 1-dodecanol as extractant and 400 µL of methanol as dispersing
J. Braz. Chem. Soc.. Publicado em: 2016-10
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4. VIS-NIR SPECTROMETRY, SOIL PHOSPHATE EXTRACTION METHODS AND INTERACTIONS OF SOIL ATTRIBUTES
The objective of this study was to evaluate the relationships between the spectra in the Vis-NIR range and the soil P concentrations obtained from the PM and Prem extraction methods as well as the effects of these relationships on the construction of models predicting P concentration in Oxisols. Soil samples' spectra and their PM and Prem extraction solution
Quím. Nova. Publicado em: 2015-03
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5. Cadmium phytoavailability in soils and evaluation of extractant effectiveness using an isotope technique
Large areas of land are nowadays contaminated by heavy metals and, it is therefore, important to monitor their levels in soils. Vegetables act as transfer mechanisms of such contaminants from soils to higher levels in the food chain. In this study, we aimed to evaluate the effectiveness of chemical extractants by the L-value method for Cd phytoavailability u
Sci. agric. (Piracicaba, Braz.). Publicado em: 2014-10
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6. Alkaline extraction of humic substances from peat applied to organic-mineral fertilizer production
An organic-mineral fertilizer based on humic substances (HSs) and potassium was developed based on the alkaline extraction of HSs from peat. The HSs have interesting properties for use as a fertilizer since they improve the physical and chemical structure of the soil and provide a source of organic carbon which is readily absorbable by the plants, whereas po
Braz. J. Chem. Eng.. Publicado em: 2014-09
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7. Disponibilidade de elementos-traço para plantas em solos tratados com lodo de esgoto: metodologia
Com base em composições de ácidos orgânicos de exsudatos radiculares obtidos da rizosfera de plantas de milho cultivadas assepticamente, pH da rizosfera e matriz química da solução do solo, extratores sintéticos desses exsudatos foram formulados. Esses extratores, que imitam o ambiente da rizosfera, onde os elementos-traço do solo são dissolvidos e
Revista Brasileira de Ciência do Solo. Publicado em: 2011-08
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8. Efficiency of boron application in an Oxisol cultivated with banana in the Central Amazon.
In the Amazon region, there is no information on the fertilization of banana plants with boron (B). Besides this, the extractant (hot water) currently used to test B concentrations has many limitations. The aim of this work was to study the effect of B on the fruit yield and quality of banana plants of the Cavendish (AAA) sub-group, grown in dystrophic Yello
Anais da Academia Brasileira de Ciências. Publicado em: 2011
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9. Efficiency of boron application in an Oxisol cultivated with banana in the Central Amazon.
In the Amazon region, there is no information on the fertilization of banana plants with boron (B). Besides this, the extractant (hot water) currently used to test B concentrations has many limitations. The aim of this work was to study the effect of B on the fruit yield and quality of banana plants of the Cavendish (AAA) sub-group, grown in dystrophic Yello
Anais da Academia Brasileira de Ciências. Publicado em: 2011
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10. Rochas moídas como fontes de potássio para o milho em solo de cerrado.
RESUMO: Três rochas foram avaliadas quanto à capacidade de fornecer potássio para o crescimento inicial do milho, num Latossolo Vermelho-Amarelo argiloso, em condições de casa de vegetação. As rochas biotita xisto, brecha alcalina e ultramáfica alcalina foram moídas (< 0,3 mm) e comparadas à fonte cloreto de potássio, nas doses de 50, 100 e 150 mg
Planaltina. Publicado em: 2011
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11. Influence of extractant and soil type on molecular characteristics of humic substances from two brazilian soils
Num estudo anterior, observou-se que substâncias húmicas (HS) extraídas com solução de NaOH e com solução de Na4P2O7 apresentaram diferentes pesos moleculares, e que o rendimento de HS extraídas por cada método variou entre um Oxisol e um Mollisol do Sul do Brazil. No presente trabalho, o estudo da matéria orgânica nestes solos foi continuado, atr
Publicado em: 2010
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12. Distribuição do fósforo no perfil do solo sob sistema plantio direto
The Cerrado, even with soils of low fertility, has been increasing in importance within the Brazilian agricultural scenario, by planning the use and management of land, with the adoption of no-tillage system (NT) and the use of correctives and fertilizers. The application of fertilizers in NT is all doneon the soil surface, which leads to the accumulation of
Publicado em: 2009