Frações de fósforo em solo adubado com fosfatos em diferentes modos de aplicação e cultivado com milho

Santos, José Zilton Lopes; Neto, Antônio Eduardo Furtini; Resende, Á. V. de; Curi, Nilton; Carneiro, Leandro Flávio; Costa, Sérgio Ely Valadão Gigante de Andrade

doi:10.1590/s0100-06832008000200025

Cited by 34 publications

(36 citation statements)

References 11 publications

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“…These results are in agreement with those obtained by Pavinato et al (2009), who reported that in a clay-loam textured Typic Hapludox, with a history of phosphate fertilization and annual crops, P was accumulated in moderately labile fractions extracted by 0.1 and 0.5 mol L -1 NaOH throughout the soil profile, which can be used by crops in cases of lack of available P (Gatiboni et al, 2007;Santos et al, 2008).…”

Section: P Fractionsupporting

confidence: 92%

“…This may be due to higher Fe oxide contents extracted by dithionitecitrate-bicarbonate and ammonium oxalate (Table 1). These data agree with those of Santos et al (2008) who, in a sandy Typic Hapludalf soil with clayey texture and phosphate fertilization (180 kg P 2 O 5 ha -1 ) in three growing seasons of corn, found a predominance of residual P in the 0-20 cm layer. Figure 1 shows the accumulated P fractions found in the three layers of all three studied areas.…”

Section: Phosphorus Fractionssupporting

confidence: 92%

“…The HCl extracts inorganic P contained in the calcium phosphates and strongly adsorbed phosphates. Lastly, soil digestion with H 2 SO 4 + H 2 O 2 + MgCl 2 extracts the residual inorganic + organic P of the soil, called recalcitrant P, which may contribute to plant nutrition in extremely P-poor soils (Gatiboni et al, 2007;Santos et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

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Phosphorus fractions in sandy soils of vineyards in southern Brazil

Schmitt

Comin

Gatiboni

et al. 2013

Rev. Bras. Ciênc. Solo

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SUMMARYPhosphorus (P) applications to vineyards can cause P accumulation in the soil and maximize pollution risks. This study was carried out to quantify the accumulation of P fractions in sandy soils of vineyards in southern Brazil. Soil samples (layers 0-5, 6-10 and 11-20 cm) were collected from a native grassland area and two vineyards, after 14 years (vineyard 1) and 30 years (vineyard 2) of cultivation, in Santana do Livramento, southern Brazil, and subjected to chemical fractionation of P. Phosphorus application, especially to the 30-year-old vineyard 2, increased the inorganic P content down to a depth of 20 cm, mainly in the labile fractions extracted by anion-exchange resin and NaHCO 3 , in the moderately labile fraction extracted by 0.1 and 0.5 mol L -1 NaOH, and in the non-labile fraction extracted by 1 mol L -1 HCl, indicating the possibility of water eutrophication. Phosphorus application and grapevine cultivation time increased the P content

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Section: P Fractionsupporting

confidence: 92%

Section: Phosphorus Fractionssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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Phosphorus fractions in sandy soils of vineyards in southern Brazil

Schmitt

Comin

Gatiboni

et al. 2013

Rev. Bras. Ciênc. Solo

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“…conventional tillage system (CTS) areas and native forest areas with oxisol, Silva et al (2000) found lower values for Fed, Feo and Fep for CTS in two areas but, for NTS, found values for Fed and Feo similar to those observed in native forest areas. In comparing an NTS area (26 years of management) with the same soil in a CTS area, Inda et al (2010) found a 5% reduction in the level of Fed in the NTS and attributed this to reductive dissolution and/or Fe complexation.…”

Section: Introductionmentioning

confidence: 76%

“…The levels of extractible iron in the 2-mm fraction were determined by atomic absorption spectrophotometry after extraction with a solution of sodium dithionite-citrate-bicarbonate (Fed), according to the method described by Schulze (1984), and with a solution of acid ammonium oxalate 0.2 mol L -1 (Feo). We also determined the iron forms extracted by sodium pyrophosphate (Fep) to yield iron complexed with the organic fraction of the soil.…”

Section: Methodsmentioning

confidence: 99%

<b>Adsorption of P and forms of iron in no-tillage areas in the ‘Cerrado’ biome

Guareschi¹,

Pereira²,

Perín³

2014

Acta Sci. Agron.

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ABSTRACT. The objective of this study was to evaluate the forms of iron extracted as sodium dithionitecitrate-bicarbonate (Fed), acid ammonium oxalate (Feo) and sodium pyrophosphate (Fep) and the relationship between these variables and the total organic carbon content and maximum adsorption capacity of P (MACP). The areas selected for this study had been using a no-tillage system (NTS) for varying periods of time: 3 years (NTS3), 15 years (NTS15) and 20 years (NTS20). These areas were compared with an area of native 'Cerrado' (CE) and a pasture area planted with Brachiaria decumbens (PA). The soil of the areas studied was classified as dystrophic oxisol. In each area, samples were collected at 0-5 cm and 5-10 cm. A correlation was observed between the C content and the different forms of Fe in the areas studied. There was a significant positive correlation between the carbon content and the forms of iron (Feo, Feo/Fed and Fep) and a negative correlation with the level of Fed. The areas of CE and PA had the highest MACP, which diminished as the amount of time of NTS use increased.

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Phosphorus cycling in a small watershed in the Brazilian Cerrado: impacts of frequent burning

et al. 2010

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Plant productivity in many tropical savannas is phosphorus limited. The biogeochemical cycling of P in these ecosystems, however, has not been well quantified. In the present study, we characterized P stocks and fluxes in a well-preserved small watershed in the Brazilian Cerrado. As the Cerrado is also a firedominated ecosystem, we measured the P stocks and fluxes in a cerrado stricto sensu plot with complete exclusion of fire for 26 years (unburned plot) and then tested some predictions about the impacts of fire impacts on P cycling in an experimental plot that was burned three times since 1992 (burned plot). The unburned area is an ecosystem with large soil stocks of total P (1,151 kg ha -1 up to 50 cm depth), but the largest fraction is in an occluded form. Readily extractable P was found up to 3 m soil depth suggesting that deep soil is more important to the P cycle than has been recognized. The P stock in belowground biomass (0-800 cm) was 9.9 kg ha -1 . Decomposition of fine litter released 0.97 kg P ha -1 year -1 . Fluxes of P through bulk atmospheric deposition, throughfall and litter leachate were very low (0.008, 0.006 and 0.028 kg ha -1 year -1 , respectively) as was stream export (0.001 kg ha -1 year -1 ). Immobilization of P by microbes during the rainy season seems to be an important mechanism of P conservation in this ecosystem. Fire significantly increased P flux in litter leachate to 0.11 kg ha -1 year -1 , and added 1.2 kg ha -1 of P in ash deposition after fire. We found an increase of P concentration in soil solution at 100 cm depth (from 0.03 lg l -1 in unburned plot to 0.3 lg l -1 in the burned plot). In surface soils (0-10 cm) of the burned plot, fire decreased the concentrations of extractable organic-P fractions, but did not significantly increase inorganic-P fractions. The reduction of extractable soil organic P in the burned plot in topsoil and the increase of P in the soil solution at greater depths indicated a reduction of P availability and may increase P fixation in deep soils. Repeated fire events over the long term may result in significant net loss of available forms of phosphorus from this ecosystem.

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Frações de fósforo em solo adubado com fosfatos em diferentes modos de aplicação e cultivado com milho

Cited by 34 publications

References 11 publications

Phosphorus fractions in sandy soils of vineyards in southern Brazil

Phosphorus fractions in sandy soils of vineyards in southern Brazil

<b>Adsorption of P and forms of iron in no-tillage areas in the ‘Cerrado’ biome

Phosphorus cycling in a small watershed in the Brazilian Cerrado: impacts of frequent burning

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