Modificações nas formas de fósforo do solo após extrações sucessivas com Mehlich-1, Mehlich-3 e resina trocadora de ânions

Gatiboni, Luciano Colpo; Kaminski, João; Santos, Danilo Rheinheimer dos

doi:10.1590/s0100-06832005000300006

Cited by 19 publications

(26 citation statements)

References 24 publications

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“…The anion exchange resins extract exclusively inorganic forms of P (Gatiboni et al, 2005). Therefore, as 36 % of P in manure was present in water-soluble inorganic forms (Table 1), all added Pi was extracted three days after incubation.…”

Section: Resultsmentioning

confidence: 99%

Organic Phosphorus Fractions in Soil Fertilized With Cattle Manure

Braos

Cruz

Ferreira

et al. 2015

Rev. Bras. Ciênc. Solo

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Inorganic phosphorus (Pi) usually controls the P availability in tropical soils, but the contribution of organic P (Po) should not be neglected, mainly in systems with low P input or management systems that promote organic matter accumulation. The aims of this study were to evaluate the changes in the Po fractions over time in soil fertilized and not fertilized with cattle manure and to correlate Po forms with available P extracted by anion exchange resin. The experiment was carried out under field conditions, in a sandy-clay loam Haplustox. The experimental design was a 2 × 9 randomized complete block factorial design, in which the first factor was manure application (20 t ha -1 ) or absence, and the second the soil sampling times (3, 7, 14, 21, 28, 49, 70, 91, and 112 days) after manure incorporation. Labile, moderately labile and non-labile Po fractions were determined in the soil material of each sampling. Manure fertilization increased the Po levels in the moderately labile and non-labile fractions and the total organic P, but did not affect the Po fraction proportions in relation to total organic P. On average, 5.1 % of total Po was in the labile, 44.4 % in the moderately labile and 50.5 % in the non-labile fractions. Available P (resin P) was more affected by the manure soluble Pi rather than by the labile Po forms. The labile and non-labile Po fractions varied randomly with no defined trend in relation to the samplings; for this reason, the data did not fit any mathematical model.

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Section: Resultsmentioning

confidence: 99%

Organic Phosphorus Fractions in Soil Fertilized With Cattle Manure

Braos

Cruz

Ferreira

et al. 2015

Rev. Bras. Ciênc. Solo

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“…Phosphorus concentration was determined by extracting soil phosphorus using the Mehlich-3 method of extraction (Mehlich, 1984), and phosphorus concentration was quantified by the colorimetric blue method. Accordingly, the C : P and N : P ratios shown here did not use organic phosphorus (P O ) concentration as usual (e.g., Walker and Adams, 1958;McGill and Cole, 1981;Stewart and Tiessen, 1987) or total phosphorus (P T ) like used by Cleveland and Liptzin (2007) and Tian et al (2010) but instead Mehlich phosphorus concentration (P ME ), which is a mixture of inorganic and organic phosphorus fractions that are, at least theoretically, more available to plants (Gatiboni et al, 2005). As this is less common, because most papers present C : P O or C : P T ratios, the use of P ME makes comparison with results obtained elsewhere difficult; this fact constrains the use of C : P ME or N : P ME ratios that are only useful for an intercomparison between our study sites.…”

Section: Sample Collection and Analysismentioning

confidence: 99%

“…One of the alternatives that has been proposed is agricultural intensification, which means not only an increase in productivity but also an attempt to increase sustainability (Godfray et al, 2010). Sustainable agriculture (SA) has been proposed as one way to achieve both goals.…”

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confidence: 99%

Changes in soil carbon, nitrogen, and phosphorus due to land-use changes in Brazil

Groppo

Lins²,

Camargo³

et al. 2015

Biogeosciences

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Abstract. In this paper, soil carbon, nitrogen and phosphorus concentrations and stocks were investigated in agricultural and natural areas in 17 plot-level paired sites and in a regional survey encompassing more than 100 pasture soils In the paired sites, elemental soil concentrations and stocks were determined in native vegetation (forests and savannas), pastures and crop-livestock systems (CPSs). Nutrient stocks were calculated for the soil depth intervals 0-10, 0-30, and 0-60 cm for the paired sites and 0-10, and 0-30 cm for the pasture regional survey by sum stocks obtained in each sampling intervals (0-5, 5-10, 10-20, 20-30, 30-40, 40-60 cm). Overall, there were significant differences in soil element concentrations and ratios between different land uses, especially in the surface soil layers. Carbon and nitrogen contents were lower, while phosphorus contents were higher in the pasture and CPS soils than in native vegetation soils. Additionally, soil stoichiometry has changed with changes in land use. The soil C : N ratio was lower in the native vegetation than in the pasture and CPS soils, and the carbon and nitrogen to available phosphorus ratio (P ME ) decreased from the native vegetation to the pasture to the CPS soils. In the plotlevel paired sites, the soil nitrogen stocks were lower in all depth intervals in pasture and in the CPS soils when compared with the native vegetation soils. On the other hand, the soil phosphorus stocks were higher in all depth intervals in agricultural soils when compared with the native vegetation soils. For the regional pasture survey, soil nitrogen and phosphorus stocks were lower in all soil intervals in pasture soils than in native vegetation soils. The nitrogen loss with cultivation observed here is in line with other studies and it seems to be a combination of decreasing organic matter inputs, in cases where crops replaced native forests, with an increase in soil organic matter decomposition that leads to a decrease in the long run. The main cause of the increase in soil phosphorus stocks in the CPS and pastures of the plot-level paired site seems to be linked to phosphorus fertilization by mineral and organics fertilizers. The findings of this paper illustrate that land-use changes that are currently common in Brazil alter soil concentrations, stocks and elemental ratios of carbon, nitrogen and phosphorus. These changes could have an impact on the subsequent vegetation, decreasing soil carbon and increasing nitrogen limitation but alleviating soil phosphorus deficiency.

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“…Resins should theoretically function similarly to roots, which, as they adsorb P from the solution, gradually consume the soil labile P (Gatiboni et al, 2005). In fact, AR can underestimate available P to the plants, particularly for perennials, for not promoting the solubilization of some non-labile P forms such as P-Ca, which some plants solubilize in the acid environment of the rhizosphere or by high Ca-absorption.…”

Section: Effect Of P-drain and Ca-drainmentioning

confidence: 99%

Phosphorus extracted by ion exchange resins and mehlich-1 from oxisols (latosols) treated with different phosphorus rates and sources for varied soil-source contact periods

Freitas¹,

Novais²,

Villani³

et al. 2013

Rev. Bras. Ciênc. Solo

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SUMMARYDespite the large number of studies addressing the quantification of phosphorus (P) availability by different extraction methods, many questions remain unanswered. The aim of this paper was to compare the effectiveness of the extractors Mehlich-1, Anionic Resin (AR) and Mixed Resin (MR), to determine the availability of P under different experimental conditions. The laboratory study was arranged in randomized blocks in a [(3 x 3 x 2) + 3] x 4 factorial design, with four replications, testing the response of three soils with different texture: a very clayey Red Latosol (LV), a sandy clay loam Red Yellow Latosol (LVA), and a sandy loam Yellow Latosol (LA), to three sources (triple superphosphate, reactive phosphate rock from Gafsa-Tunisia; and natural phosphate from Araxá-Minas Gerais) at two P rates (75 and 150 mg dm -3 ), plus three control treatments (each soil without P application) after four contact periods (15, 30, 60, and 120 days) of the P sources with soil. The soil acidity of LV and LVA was adjusted by raising base saturation to 60 % with the application of CaCO 3 and MgCO 3 at a 4:1 molar ratio (LA required no correction). These samples were maintained at field moisture capacity for 30 days. After the contact periods, the samples were collected to quantify the available P concentrations by the three extractants. In general, all three indicated that the available P-content in soils was reduced after longer contact periods with the P sources. Of the three sources, this reduction was most pronounced for triple superphosphate, intermediate for reactive phosphate, while Araxá phosphate was (1) REUSMO: FÓSFORO EXTRAÍDO COM RESINAS TROCADORAS DE ÍONS E MEHLICH-1 DE LATOSSOLOS SUBMETIDOS A FONTES E DOSES DE FÓSFORO E TEMPOS DE CONTATO

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Modificações nas formas de fósforo do solo após extrações sucessivas com Mehlich-1, Mehlich-3 e resina trocadora de ânions

Cited by 19 publications

References 24 publications

Organic Phosphorus Fractions in Soil Fertilized With Cattle Manure

Organic Phosphorus Fractions in Soil Fertilized With Cattle Manure

Changes in soil carbon, nitrogen, and phosphorus due to land-use changes in Brazil

Phosphorus extracted by ion exchange resins and mehlich-1 from oxisols (latosols) treated with different phosphorus rates and sources for varied soil-source contact periods

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