Tillage, mineralization and leaching: phosphate

Addiscott, T. M.; Thomas, Daniel L.

doi:10.1016/s0167-1987(99)00110-5

Cited by 94 publications

(55 citation statements)

References 77 publications

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“…Na média das três profundidades, a SD apresentou valores de P disponível superiores aos dos demais tratamentos. A ausência do revolvimento diminui a superfície de contato P-argilas, o que reduz a adsorção do P pelos óxidos de Fe e Al do solo e, conseqüentemente, a sua imobilização (Addiscott & Thomas 2000). O acúmulo de P na camada superficial da SD também foi verificado por Sampaio (1987); Siqueira (1989); Klepker & Anghinoni (1995); Siqueira (1995); Franzluebbers & Hons (1996); Tognon et al (1997);Cadavid et al (1998);Rheinheimer et al (1998); Sá (1998);Vallejos M. (1998); Bayer & Bertol (1999);Demaria et al (1999) e Sá (1999.…”

Section: Resultsunclassified

Influência dos sistemas de preparo nas propriedades químicas e físicas do solo

Falleiro

Souza

Silva

et al. 2003

Rev. Bras. Ciênc. Solo

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RESUMOOs diferentes sistemas de preparo provocam alterações nas propriedades químicas, físicas e biológicas do solo, podendo requerer modificações no manejo e nas recomendações de adubação e calagem. Este trabalho avaliou os efeitos dos sistemas de preparo sobre as propriedades químicas e físicas do solo, em um experimento instalado em 1985. A área experimental vem sendo cultivada com culturas anuais em seis sistemas de preparo: semeadura direta (SD), arado de discos (AD), arado de aivecas (AA), grade pesada (GP), grade pesada + arado de discos (GP + AD) e grade pesada + arado de aivecas (GP + AA). O delineamento utilizado foi de blocos completos casualizados, com quatro repetições. As amostragens foram realizadas após a cultura do milho (safra 2001/02), nas profundidades de 0-5, 5-10 e 10-20 cm. As amostras de solo foram submetidas às análises químicas e físicas e as médias comparadas pelo teste de Tukey. Os sistemas de preparo influíram nas propriedades químicas e físicas do solo, com a maior parte das diferenças ocorrendo entre a SD e os demais sistemas. A densidade do solo foi superior na SD, em relação à dos demais tratamentos. Houve incremento nos valores de MO, pH, CTC efetiva, Ca 2+ , Mg 2+ , K e P, na camada superficial da SD, em relação às demais profundidades. A semeadura direta apresentou valores de Al 3+ inferiores aos dos demais tratamentos, na camada de 0-5 cm de profundidade, e superiores aos dos tratamentos AD, GP e GP + AA, na camada de 10-20 cm. Os tratamentos AD, GP, GP + AD e GP + AA apresentaram valores de K superiores aos dos tratamentos SD e AA, na camada de 0-5 cm de profundidade. O tratamento SD apresentou teores de P disponível superiores aos dos demais tratamentos, na camada de 0-5 cm de profundidade e na média das três profundidades.

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Section: Resultsunclassified

Influência dos sistemas de preparo nas propriedades químicas e físicas do solo

Falleiro

Souza

Silva

et al. 2003

Rev. Bras. Ciênc. Solo

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“…In a recent review of the effects of tillage on the mineralisation and leaching of phosphate, Addiscott & Thomas (2000) concluded that while tillage may increase the mineralisation of organic P, the process is probably too slow to cause large losses as occurs with nitrate. While our data lend some support to this conclusion by showing much lower concentrations and loads of DRP in drainage from cultivated soils, compared with pasture soils, the concentrations and loads of DOP were similar.…”

Section: Discussionmentioning

confidence: 99%

The potential for phosphorus loss in relation to nitrogen fertiliser application and cultivation

McDowell

Monaghan

2002

New Zealand Journal of Agricultural Research

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The amounts and forms of dissolved phosphorus (P) leached from undisturbed and cultivated soil in lysimeters were measured from sites that had received N fertiliser at 0, 200 or 400 kg N ha -1 yr -1 for 4 years. Soil in mini-lysimeters, 18 cm i.d. by 25 cm depth, was leached at monthly intervals over autumn and winter (500 mm total drainage) to simulate a relatively wet autumnwinter for eastern Southland (typical drainage, c. 350 mm yr -1 ). The major form of P leached was dissolved organic P (DOP), which represented 67 and 80% of total dissolved P (TDP) losses in the undisturbed and cultivated soil treatments, respectively. Historical N inputs had little effect on the amounts of dissolved reactive P (DRP), DOP or TDP leached from the undisturbed soils. However, DRP, and to a lesser extent TDP, losses decreased as historical N fertiliser inputs increased in the cultivated soil treatment. Significantly greater losses of DRP were observed from undisturbed compared with cultivated soils. The lower DRP losses in cultivated soil were attributed to greater sorption of P during matrix flow. These results suggest that, although DRP losses are of little concern following cultivation of pastoral soils, the greater mobility and loss of DOP in drainage, in both undisturbed and cultivated soils, represents a potential risk to water quality and loss of P from the plant rooting zone. Further study to examine the bioavailability of DOP is warranted to determine its potential risk to surface water.

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“…As a consequence, the organic P fraction of soils varies significantly, generally representing between 20% and 80% of total soil P [6][7][8]. Pasture soils tend to contain a higher proportion of organic P than cultivated soils [9]. Some of the "available" organic P forms play important role in biological cycling of P in soils, however the dynamics of organic P are not completely understood and require further investigation [10,11].…”

Section: Introductionmentioning

confidence: 99%

Phosphorus Distribution in Soils from Australian Dairy and Beef Rearing Pastoral Systems

2016

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Abstract:The influence of soil type and management practices on P distribution in soils from Australian dairy and beef rearing pastoral systems has been investigated by chemical measurements and phosphorus-31 ( 31 P) nuclear magnetic resonance (NMR) spectroscopy. The amount and forms of P within the soil profile varied with soil type, with the acidic red Ferrosols containing relatively high orthophosphate concentrations, averaging 72.2% compared with 66.8% for Dermosols, under similar management conditions. Soil from Sodosol sites which received less fertiliser P addition had the lowest orthophosphate concentration with only 57.6%. In contrast, relatively high proportions of organic P were found in soil samples from unfertilised Sodosol sites. On average, soil from Sodosol sites contained 37.5% organic P (combined monoester P and diester P), while those from Dermosol and Ferrosol sites contained 31.7% and 25.8%, respectively. Of these, the highest monoester phosphate proportions of 44.6% (site M3) and 46.4% (site M4) were found in Sodosol sites with no recent P inputs, but the highest proportion of diester phosphate (5.7%) was found in an unclassified grey sandy loam Dermosol. The higher organic P concentrations in soil from Sodosol sites may be associated with more regular moisture input from both rainfall and boarder-check (flood) irrigation. The highest level of pyrophosphate (8.5%) was also found in a grey/yellow Sodosol. Overall, the results indicate that P speciation in the Australian soils is strongly influenced by soil type, fertiliser P application rate and timing, and moisture variations.

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Tillage, mineralization and leaching: phosphate

Cited by 94 publications

References 77 publications

Influência dos sistemas de preparo nas propriedades químicas e físicas do solo

Influência dos sistemas de preparo nas propriedades químicas e físicas do solo

The potential for phosphorus loss in relation to nitrogen fertiliser application and cultivation

Phosphorus Distribution in Soils from Australian Dairy and Beef Rearing Pastoral Systems

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