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| Rogeri,Douglas Antonio; Bortolon,Leandro; Gianello,Clesio; Amorim,Magno Batista. |
| Abstract: The objective of this work was to evaluate remaining P compared with soil clay content as a P buffer index to classify P extracted by the Mehlich-1 (M1) and Mehlich-3 (M3) methods in soils from the state of Rio Grande do Sul, Brazil. The experiment was carried out in a completely randomized design with five P2O5 rates (0, 50, 100, 200, and 400 mg kg-1) and two sucessive corn crops, and three replicates, in 20 representative soils of the state. P extracted by M1 and M3 before crop planting was adjusted to P contents in biomass, considering soil buffer capacity. The division of soils into different buffering classes, based on soil clay or remaining P, improved the capacity of estimating soil available P of both methods. However, there was no... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Clay content; Phosphate buffer capacity; Phosphate fertilization; Phosphorus adsorption; Soil test. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017001201203 |
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| Novais,Sarah Vieira; Mattiello,Edson Marcio; Vergutz,Leonardus; Melo,Leônidas Carrijo Azevedo; Freitas,Írio Fernando de; Novais,Roberto Ferreira. |
| 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... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: P adsorption; S adsorption; Available nutrient; Phosphate buffer capacity; Extractant. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000401079 |
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