Fósforo remanescente em argila e silte retirados de Latossolos após pré-tratamentos na análise textural

Donagemma, G. K.; Ruíz, Hugo Alberto; V., Víctor Hugo Álvarez; Ker, João Carlos; Fontes, Maurício Paulo Ferreira

doi:10.1590/s0100-06832008000400043

Cited by 29 publications

(25 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…O mapa de distribuição espacial de fósforo remanescente pode servir como importante ferramenta para se conhecer a localização de áreas com maior e menor disponibilidade de fósforo (DONOGEMMA et al, 2008). Assim, ele pode ser utilizado, por exemplo, como alternativa para estimativas de recomendação de doses para aplicação de fertilizante fosfatado a taxas variadas.…”

Section: Resultsunclassified

Variabilidade espacial de atributos do solo em sistema de semeadura direta com rotação de culturas no cerrado brasileiro

Bottega¹,

Queiroz²,

Pinto³

et al. 2013

Rev. Ciênc. Agron.

View full text Add to dashboard Cite

Section: Resultsunclassified

Variabilidade espacial de atributos do solo em sistema de semeadura direta com rotação de culturas no cerrado brasileiro

Bottega¹,

Queiroz²,

Pinto³

et al. 2013

Rev. Ciênc. Agron.

View full text Add to dashboard Cite

“…Unlike the P-rem, the clay contents moderately correlated only with the Fe DCB (r = 0.66 ** ) ( Table 3). The lack of correlation between the clay content and Fe OX is an indication that soil clay accumulation is not necessarily associated with the presence of Fe oxides of low crystallinity, which are described as having a high capacity of P adsorption (Hernández and Meurer, 1998;Donagemma et al, 2008). In addition to crystalline Fe oxides and clay minerals 1:1 (such as kaolinite), which have a lower potential to adsorb Fe oxides of low crystallinity, they can also significantly affect the adsorption of P, mainly due to the higher quantity generally found in soils (Torrent et al, 1994;Vilar et al, 2010).…”

Section: Relationship Between the Physical And Chemical Properties Ofmentioning

confidence: 99%

Substitution of Clay Content for P-Remaining as an Index of the Phosphorus Buffering Capacity for Soils of Rio Grande do Sul

Rogeri

Gianello

Bortolon

et al. 2016

Rev. Bras. Ciênc. Solo

View full text Add to dashboard Cite

Mehlich-1 soil extract is currently used in Rio Grande do Sul (RS) and Santa Catarina (SC) States, in Brazil, to evaluate soil phosphorus available to plants and Mehlich-1 is sensitive to soil buffering capacity. This limitation is overcome partly by soil separation into buffering classes based on soil clay content. However, soil clay content has some technical and operational limitations, such as the underestimation of soil clay levels in soils under no-till. The aim of this study was to evaluate the remaining phosphorus (P-rem) compared to soil clay content as an index of the buffering capacity in soils of RS. The relationship between P-rem and soil clay content was assessed using 200 soil samples from a wide range of locations across the state. In 20 representative soil types, P-rem, soil clay content, P maximum adsorption capacity, total and pedogenic Fe contents, amount of P 2 O 5 needed to increase soil P in 1 mg kg -1 extracted by Mehlich-1 and -3 methods and P capacity factor were determined. Furthermore, a pot experiment was carried out with plants to determine soil P content extracted by Mehlich-1 and -3 at the maximum technical efficiency (MET) and the maximum absorption efficiency (MEA). Correlation analyses were performed between P-rem and soil clay content and, with the attributes of soils involving the P buffering capacity. The relationship between P-rem and soil clay content was described as a decreasing exponential function; however, the adjustment was not adequate to propose critical levels for P-rem. The P-rem index was superior to soil clay index in practically all relationships with the attributes related to the soil buffering capacity of the soils. In some cases, the indexes were similar; however, P-rem was not lower than the soil clay content in any case. The P-rem is a more reliable index to represent soil buffering capacity than the soil clay content in soils from RS, and P-rem might be used to implement soil classes for Mehlich-1 and Mehlich-3 determinations of soil P.

show abstract

“…in contrast, a continuous linear response was observed between the p variables in the extract-soil and rem-p for the Mcpa extractor, which shows increasing loss of extraction capacity of this extractor with an increase in the pbc of the soil, indicating the validity of the linear relationship between the available s of the soil and the pbc, estimated by rem-p, as currently adopted. (Donagemma et al, 2008) as a measure of PBC, essential for interpretation of the P and S contents obtained. However, in general, the decrease in the Critical Level (CL) of these nutrients with the decrease in Rem-P has not been appropriately understood or described in the literature.…”

Section: Introductionmentioning

confidence: 99%

Loss of Extraction Capacity of Mehlich-1 and Monocalcium Phosphate as a Variable of Remaining P and Its Relationship to Critical Levels of Soil Phosphorus and Sulfur

Novais

Mattiello

Vergütz

et al. 2015

Rev. Bras. Ciênc. Solo

View full text Add to dashboard Cite

the Mehlich-1 (M-1) extractant and Monocalcium phosphate in acetic acid (Mcpa) have mechanisms for extraction of available p and s in acidity and in ligand exchange, whether of the sulfate of the extractant by the phosphate of the soil, or of the phosphate of the extractant by the sulfate of the soil. in clayey soils, with greater p adsorption capacity, or lower remaining p (rem-p) value, which corresponds to soils with greater phosphate buffer capacity (pbc), more buffered for acidity, the initially low ph of the extractants increases over their time of contact with the soil in the direction of the ph of the soil; and the sulfate of the M-1 or the phosphate of the Mcpa is adsorbed by adsorption sites occupied by these anions or not. this situation makes the extractant lose its extraction capacity, a phenomenon known as loss of extraction capacity or consumption of the extractant, the object of this study. twenty soil samples were chosen so as to cover the range of rem-p (0 to 60 mg L -1 ). rem-p was used as a measure of the pbc. the p and s contents available from the soil samples through M-1 and Mcpa, and the contents of other nutrients and of organic matter were determined. for determination of loss of extraction capacity, after the rest period, the ph and the p and s contents were measured in both the extracts-soils. Although significant, the loss of extraction capacity of the acidity of the M-1 and Mcpa extractants with reduction in the rem-p value

show abstract

Fósforo remanescente em argila e silte retirados de Latossolos após pré-tratamentos na análise textural

Cited by 29 publications

References 15 publications

Variabilidade espacial de atributos do solo em sistema de semeadura direta com rotação de culturas no cerrado brasileiro

Variabilidade espacial de atributos do solo em sistema de semeadura direta com rotação de culturas no cerrado brasileiro

Substitution of Clay Content for P-Remaining as an Index of the Phosphorus Buffering Capacity for Soils of Rio Grande do Sul

Loss of Extraction Capacity of Mehlich-1 and Monocalcium Phosphate as a Variable of Remaining P and Its Relationship to Critical Levels of Soil Phosphorus and Sulfur

Contact Info

Product

Resources

About