Interpretação de resultados analíticos de fósforo pelos extratores Mehlich-1 e Mehlich-3 em solos do Rio Grande do Sul

Bortolon, Leandro; Gianello, Clésio

doi:10.1590/s0100-06832008000700019

Cited by 23 publications

(35 citation statements)

References 13 publications

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“…However, in the clayey soil (LV), with lower remaining P (Table 1), the difference between the results in the comparison of the extractors was greater (much less for M1). In the sandy soils (LVA and LA) (Table 1), which is a condition for lower M1consumption, the extracted P contents approached, although statistically still lower, the levels of the resins ( the soil, e.g., of the clay content (Bortolon & Gianello, 2008), or more appropriate, remaining P (Simões Neto et al, 2009), to compare the results of available P extracted by consumption-sensitive extractors such as M1 and non-sensitive (or very little sensitive) extractants such as Ionic Resins. This tendency was explained by Gianello (2008b) andSimões Neto et al (2009), who mentioned the key influence of the soil clay content on the extraction capacity of M1 and AR.…”

Section: Effect Of Preferential Extraction Of P-ca and Of Mehlich-1 Cmentioning

confidence: 91%

“…The literature reports that the extraction power of an extractor is exhausted or worn out, leading to the underestimation of the levels of available soil P, to the same extent as the clay content of the soil increases (Bortolon & Gianello, 2008) or remaining P decreases (Simões Neto et al, 2011) (Tables 1 and 7). …”

Section: Effect Of Preferential Extraction Of P-ca and Of Mehlich-1 Cmentioning

confidence: 99%

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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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Section: Effect Of Preferential Extraction Of P-ca and Of Mehlich-1 Cmentioning

confidence: 91%

Section: Effect Of Preferential Extraction Of P-ca and Of Mehlich-1 Cmentioning

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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“…Soil clay contents were measured with the densimeter method, with sample dispersion using 0.1 mol L -1 NaOH plus 2 hours of shaking. STP values were determined with four methods: P M1 , Mehlich-1 (Tedesco et al, 2004), which is the standard method for soil P extraction in the region; P M3 , Mehlich-3 (Bortolon & Gianello, 2008); P OX , ammonium oxalate at pH 3.0 (Schwertmann, 1964); and WEP (Self- Davis et al, 2009). The amounts of extractable Ca, Mg, Fe, and Al were also determined, using inductively coupled plasma optical emission spectrometry (ICP-OES), with the Optima 7300 DV spectrometer (Perkin Elmer, Wellesley, MA, USA).…”

Section: Methodsmentioning

confidence: 99%

“…The first one was used because it is the standard STP in the Southern Brazil and it is easy to include Fe+Al in the determination process, since ICP-OES is adopted in several laboratories. The second one was used because it has been tested in Southern Brazil as an alternative for Mehlich-1 (Bortolon & Gianello, 2008). The evaluation of different routine soil test P to calculate the DPS is important for developing a practical DPS measurement methodology, providing an analytical tool suitable for P management (Nair et al, 2004) and that can predict the risk of P losses by runoff, considering WEP as the potential P form to be lost.…”

Section: Methodsmentioning

confidence: 99%

Degree of phosphorus saturation threshold for minimizing P losses by runoff in cropland soils of Southern Brazil

Bortolon

Ernani

Bortolon

et al. 2016

Pesq. agropec. bras.

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-The objective of this work was to assess the risk of phosphorus losses by runoff through an index based on the degree of P saturation (DPS), in cropland soils of Southern Brazil. Sixty-five highly representative cropland soils from the region were evaluated. Three labile P forms were measured (Mehlich-1, Mehlich-3, and ammonium oxalate), and four P sorption indexes were tested (phosphorus single sorption point and Fe+Al determined with the three extractors). Water-extractable P (WEP) was used as an index of P susceptibility to losses by surface runoff. The DPS was determined from the ratio between labile P and each sorption index. DPS values obtained from the ratio between Mehlich-1 P and the single P sorption point ranged from 1 to 25%, whereas those from Mehlich-1 P and Fe+Al (ammonium oxalate) ranged from 1 to 55%. All DPS types were highly correlated with WEP. From a practical stand point, the DPS obtained with both P and Fe+Al extracted with Mehlich-1 can be used to estimate the risk of P losses by runoff in soils of Southern Brazil.Index terms: eutrophication, runoff, single P sorption point, water quality. Limite do grau de saturação de fósforo para minimizar perdas de P por escorrimento superficial em solos agrícolas do Sul do BrasilResumo -O objetivo deste trabalho foi avaliar o risco de perdas de fósforo por escorrimento superficial por meio de um índice baseado no o grau de saturação de P (GSP) no solo, em solos agrícolas do Sul do Brasil. Foram avaliados 65 solos agrícolas representativos da região. Três formas lábeis de P foram medidas (Mehlich-1, Mehlich-3 e oxalato de amônio), e quatro índices de adsorção de P foram testados (adsorção de P em único ponto e Fe+Al obtido com os três extratores). O P extraível em água (PEA) foi utilizado como índice de suscetibilidade do P a perdas por escoamento superficial. O GSP foi obtido a partir do quociente entre a forma lábil de P e cada índice de adsorção. Os valores do GSP obtidos a partir do quociente entre P Mehlich-1 e a adsorção de P em único ponto variaram de 1 a 25%, enquanto os entre P Mehlich-1 e Fe+Al (oxalato de amônio) variaram de 1 a 55%. Todos os tipos de GSP estiveram altamente correlacionados ao PEA. Do ponto de vista de uso prático, o GSP obtido com P e Fe+Al extraídos com Mehlich-1 pode ser usado para estimar o risco de perda de P por escorrimento superficial em solos do Sul do Brasil.Termos para indexação: eutrofização, escorrimento superficial, P em único ponto, qualidade de água.

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“…Isso decorre, em parte, devido à baixa previsibilidade da necessidade de adubação fosfatada em solos que recebem fosfatos naturais e também devido às baixas quantidades de fósforo extraído em solos de textura argilosa, o que determina faixas de interpretação de teores de fósforo condicionadas à classificação textural dos solos (RHEINHEIMER et al, 2008). Dentre os métodos alternativos ao Mehlich-1, estão o Mehlich-3 e a resina de troca iônica em membrana, os quais foram testados em outras condições por diversos autores (MIOLA et al, 1999;BISSANI et al, 2002;BORTOLON & GIANELLO, 2006;BORTOLON & GIANELLO, 2008;SCHLINDWEIN & GIANELLO, 2008).…”

Section: Introductionunclassified

Métodos de extração de fósforo e potássio no solo sob sistema plantio direto

2009

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Interpretação de resultados analíticos de fósforo pelos extratores Mehlich-1 e Mehlich-3 em solos do Rio Grande do Sul

Cited by 23 publications

References 13 publications

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

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

Degree of phosphorus saturation threshold for minimizing P losses by runoff in cropland soils of Southern Brazil

Métodos de extração de fósforo e potássio no solo sob sistema plantio direto

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