Fósforo em solos representativos do estado da paraíba: I- isotermas de adsorção e medidas do fator capacidade de fósforo

Farias, Daise Ribeiro de; Oliveira, Fábio Henrique Tavares de; Santos, Djail; Arruda, Jandeilson Alves de; Hoffmann, Ricardo Bezerra; Novais, Roberto Ferreira

doi:10.1590/s0100-06832009000300015

Cited by 26 publications

(21 citation statements)

References 16 publications

(20 reference statements)

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“…Unlike in the Cerrado, P sorption in soils in the semiarid region of northeast Brazil is low and the doses of phosphate fertilizers required to maintain an adequate level of P in the soil solution to ensure plant growth are not high (Agbenin & Tiessen, 1994;Pereira & Faria, 1998;Farias et al, 2009). …”

Section: Resultsmentioning

confidence: 99%

“…The process of soil P sorption has been widely studied over the last few years, particularly because physicochemical adsorption to soil surfaces is the main process underlying phosphate retention, resulting in low P availability (Barrow, 1974;Agbenin & Tiessen, 1994;Novais & Smyth, 1999;Farias et al, 2009). Adsorption and precipitation reactions begin immediately after P addition to the soil.…”

Section: Introductionmentioning

confidence: 99%

“…In soils where the pH is high, as in the case of several soils in the semi-arid region of northeastern Brazil, a small portion of this soil-applied P is adsorbed to the surface of secondary minerals of the clay fraction (with increased occurrence of 2:1 and 1:1 clay minerals and low content of Fe and Al oxyhydroxides), while the major portion is precipitated with Ca 2+ of the soil solution, forming hydroxyapatite (Ca 5 (PO 4 ) 3 OH) (Novais & Smyth, 1999). The set of these simultaneous adsorption and precipitation reactions of soil P is called soil P sorption (Sparks, 1995;Novais & Smyth, 1999;Sims & Pierzynski, 2005;Farias et al, 2009). Soil P sorption is a twostage process.…”

Section: Introductionmentioning

confidence: 99%

“…(Karaca et al, 2004;Cheung & Venkitachalam, 2006;Guan et al, 2007;Luengo et al, 2007;Wang et al, 2009). Numerous studies in Brazil have looked into the process of P sorption as related to the amount of P adsorbed (Pereira & Faria, 1998;Moreira et al, 2006;Chaves et al, 2007;Farias et al, 2009), but few studies focused on the sorption process over time, which was addressed in the studies of Singh et al (1983), Gonçalves et al (1985) and Reis et al (1995). The importance of these studies lies in the fact that the faster the process of P sorption to soil surfaces, the lower the amount of plant-available P in short periods.…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of phosphorus sorption in soils in the state of Paraíba¹

Santos

Oliveira

Salcedo

et al. 2011

Rev. Bras. Ciênc. Solo

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SUMMARYThe soil P sorption capacity has been studied for many years, but little attention has been paid to the rate of this process, which is relevant in the planning of phosphate fertilization. The purpose of this experiment was to assess kinetics of P sorption in 12 representative soil profiles of the State of Paraíba (Brazil), select the best data fitting among four equations and relate these coefficients to the soil properties. Samples of 12 soils with wide diversity of physical, chemical and mineralogical properties were agitated in a horizontal shaker, with 10 mmo L -1 CaCl 2 solution containing 6 and 60 mg L -1 P, for periods of 5, 15, 30, 45, 60, 90, 120, 420, 720, 1,020, and 1,440 min. After each shaking period, the P concentration in the equilibrium solution was measured and three equations were fitted based on the Freundlich equation and one based on the Elovich equation, to determine which soil had the highest sorption rate (kinetics) and which soil properties correlated to this rate. The kinetics of P sorption in soils with high maximum P adsorption capacity (MPAC) was fast for 30 min at the lower initial P concentration (6 mg L -1 ). No difference was observed between soils at the higher initial P concentration (60 mg L -1 ). The P adsorption kinetics were positively correlated with clay content, MPAC and the amount of Al extracted with dithionite-citratebicarbonate. The data fitted well to Freundlich-based equations equation, whose coefficients can be used to predict P adsorption rates in soils.Index terms: Adsorption, kinetic equations, phosphate, tropical soils, semi-arid soils.( de P, pelos períodos de 5, 15, 30, 45, 60, 90, 120, 420, 720, 1.020

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Kinetics of phosphorus sorption in soils in the state of Paraíba¹

Santos

Oliveira

Salcedo

et al. 2011

Rev. Bras. Ciênc. Solo

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“…Three samples of the substrate were collected for its initial characterization, through the determination of pH in water, available contents of P, K, Fe, Mn and S, exchangeable contents of Na, Ca 2+ , Mg 2+ and Al 3+ , CEC at pH 7.0, exchangeable sodium percentage, content of organic matter (OM) (EMBRAPA, 1997), reminiscent P (Farias et al, 2009), field capacity (FC) at -10 kPa, substrate density (Ds) and particle density (Dp), through the methods of graduated cylinder and volumetric flask (EMBRAPA, 1997), respectively, and granulometry (Ruiz, 2005). The content of available As was extracted with Mehlich 3 extractor and quantified through inductively coupled plasma optical emission spectrometry (ICP-OES), at the wavelength of 193.696 nm.…”

Section: Methodsmentioning

confidence: 99%

Cultivation of vetiver in saline tailings contaminated with arsenic under phosphorus doses

Guimarães

Dias

Assis

et al. 2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe processing of gold ores exploited in Paracatu, MG, generates tailings that are challenging for revegetation, mainly because of the high content of arsenic and salinity. Aiming at the revegetation of the area of disposal of these tailings, the objective of this study was to evaluate the effects of phosphorus doses on vetiver plants (Chrysopogon zizanioides) and on the planting substrate, which consisted of tailings from the processing of ore named B1, exploited in Paracatu, with water restriction. Vetiver was grown for four months in the substrate under doses of 0, 140, 280, 560 and 1280 mg kg -1 of P 2 O 5 . Increasing doses of phosphorus improved the chemical characteristics of the substrate. However, the highest dose (1280 mg kg -1 P 2 O 5 ) resulted in higher toxicity of arsenic for the plants. Under the evaluated conditions, the dose of 560 mg kg -1 of P 2 O 5 is the most suitable for the fertilization of vetiver and, therefore, also for the revegetation of the substrate. Vetiver survives under low availability of water in the tailings.Cultivo de vetiver em um rejeito salino contaminado com arsênio sob doses de fósforo IntroductionSome ores exploited for gold production may contain toxic elements, such as arsenic (As), in their composition, causing environmental problems. In Brazil, gold and iron mining has contributed to the dispersion of As and its entry in the food chain (Campos et al., 2006).The tailings produced in the processing of gold ores exploited in Paracatu, MG, Brazil, have limiting characteristics to plant growth, especially acidity, salinity and high As concentrations, which compromise the process of revegetation of the basin where they are disposed. A practice that can facilitate the establishment of plants in these tailings is phosphate fertilization.The addition of P has been reported as inhibitor of As absorption (Lei et al., 2012). Phosphate and arsenate are chemically similar and share the same membrane transporters in root cells, and the transporters have higher affinity for the phosphate (Tu & Ma, 2003;Zhao et al., 2008).Besides phosphate fertilization, plants tolerant to As and to salinity may have promising responses for the revegetation of tailings. One species with desirable characteristics to start the process of revegetation is Chrysopogon zizanioides (vetiver). The species, besides having high biomass production, has high tolerance and capacity of accumulation of contaminants (Singh et al., 2007).In this context, this study aimed to evaluate the effects of P doses on vetiver plants and on the planting substrate, which consisted of tailings from the processing of one of the gold ores exploited in Paracatu, MG, Brazil, subjected to water restriction. Material and MethodsThe substrate consisted of tailings from the processing of B1 ore, which is a highly weathered phyllite, with sulfide contents around 3.0 g kg -1 , collected in Paracatu, MG, Brazil. Three samples of the substrate were collected for its initial characterization, through the determination of pH i...

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