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Adsorption and availability of phosphorus in response to humic acid rates in soils limed with CaCO3 or MgCO3 Ciência e Agrotecnologia
Maluf,Henrique José Guimarães Moreira; Silva,Carlos Alberto; Curi,Nilton; Norton,Lloyd Darrell; Rosa,Sara Dantas.
ABSTRACT Humic acid (HA) may reduce adsorption and increase soil P availability, however, the magnitude of this effect is different when Ca2+ prevails over Mg2+ in limed soils. The objective of this study was to evaluate the effects of HA rates and carbonate sources on the adsorption, phosphate maximum buffering capacity (PMBC), and P availability in two contrasting soils. Oxisol and Entisol samples were firstly incubated with the following HA rates: 0, 20, 50, 100, 200 and 400 mg kg-1, combined with CaCO3 or MgCO3, to evaluate P adsorption. In sequence, soil samples were newly incubated with P (400 mg kg-1) to evaluate P availability. The least P adsorption was found when 296 mg kg-1 of HA was added to Oxisol. Applying HA rates decreased maximum...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Organic ligands; Liming; Humic acid-metal-P complexes; Langmuir isotherm; Phosphate maximum buffering capacity..
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542018000100007
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Humic acid-phosphate fertilizer interaction and extractable phosphorus in soils of contrasting texture Rev. Ciênc. Agron.
Rosa,Sara Dantas; Silva,Carlos Alberto; Maluf,Henrique José Guimarães Moreira.
ABSTRACT Extractable phosphorus (P) in soil depends on soil test employed, reactivity of fertilizer and interaction of P added to the soil properties, including organic matter. The aim of this paper was to assess the contents of P extracted from Red Latosol (LVd) and Quartzarenic Neosol (RQ) samples, incubated with 0; 5; 10; 50 or 100 mg kg-1 C-humic acid (C-HA) and 400 mg kg-1 of P, via Araxá phosphate rock (AP), Bayóvar reactive phosphate rock (BP) or single superphosphate (SS). Thus, it was adopted a five (C-HA concentrations) x three (P sources) factorial arrangement, using a randomized block design with three replications. The mixtures of soil, C-HA concentrations and P sources were incubated for 60 days; in sequence, the soil P was extracted by...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Humic substances; Extractors of soil P; Soil pH; Phosphate rocks.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902018000100032
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