Solubility and retention of phosphate in soils of the northwestern Canadian prairie

Soon, Y. K.

doi:10.4141/cjss91-044

Cited by 20 publications

(14 citation statements)

References 6 publications

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“…The fractions of P i extracted by strong acid were most highly correlated with clay concentration (Table 4). Clay content is among the most important soil properties influencing P sorption capacity in soils (Soon 1991;Cox 1994) and accounts for much of the variation in P fractions released by strong acids (Tiessen et al 1984;Roberts et al 1985). The slope of the regression of P i released by strong acids with clay concentration was slightly higher (P = 0.07) for Gray than Brown soil (Fig.…”

Section: Inorganic Pmentioning

confidence: 99%

Relationship of soil phosphorus fractions to phosphorus soil tests and fertilizer response

McKenzie¹,

Bremer²

2003

Can. J. Soil. Sci.

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Mckenzie, R. H. and Bremer, E. 2003. Relationship of soil phosphorus fractions to phosphorus soil tests and fertilizer response. Can. J. Soil Sci. 83: 443-449. Soil tests for available P may not be accurate because they do not measure the appropriate P fraction in soil. A sequential extraction technique (modified Hedley method) was used to determine if soil test P methods were accurately assessing available pools and if predictions of fertilizer response could be improved by the inclusion of other soil P fractions. A total of 145 soils were analyzed from field P fertilizer experiments conducted across Alberta from 1991 to 1993. Inorganic P (P i ) removed by extraction with an anion-exchange resin (resin P) was highly correlated with the Olsen and Kelowna-type soil test P methods and had a similar relationship with P fertilizer response. No appreciable improvement in the fit of available P with P fertilizer response was achieved by including any of the less available P fractions in the regression of P fertilizer response with available P. Little P i was extractable in alkaline solutions (bicarbonate and NaOH), particularly in soils from the Brown and Dark Brown soil zones. Alkaline fractions were the most closely related to resin P, but the relationship depended on soil zone. Inorganic P extractable in dilute HCl was most strongly correlated with soil pH, reflecting accumulation in calcareous soils, while P i extractable in concentrated acids (HCl and H 2 SO 4 ) was most strongly correlated with clay concentration. A positive but weak relationship was observed between these fractions and resin P. Complete fractionation of soil P confirmed that soil test P methods were assessing exchangeable, plant-available P. Il se pourrait que le dosage du P dans le sol manque de précision, les méthodes employées ne mesurant pas adéquatement la fraction appropriée de P dans le sol. Les auteurs ont recouru à une méthode d'extraction séquen-tielle (variante de la méthode de Hedley) pour voir si les méthodes de dosage du P établissent les réserves de P disponible avec la précision voulue et pour déterminer si l'inclusion d'autres fractions de P du sol aboutirait à une meilleure prévision de la réaction des cultures aux engrais. En tout, les auteurs ont analysé 145 sols venant d'expériences sur les engrais phosphatés effectuées sur le terrain, un peu partout en Alberta, de 1991 à 1993. Le P inorganique (P i ) extrait au moyen d'une résine échangeuse d'anions (résine P) est fortement corrélé aux méthodes de dosage de type Olsen et Kelowna et présente une relation similaire avec la réac-tion des cultures aux engrais. L'inclusion d'une fraction de P moins assimilable quelconque à l'analyse de régression de la réac-tion aux engrais phosphatés en fonction du P disponible ne conduit pas à un meilleur ajustement du P disponible avec la réaction aux engrais. Les solutions alcalines (bicarbonate et NaOH) ne récupèrent qu'une petite quantité du P i extractible, surtout dans les sols bruns et brun foncé. Les fractions alcalines présentent le...

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Section: Inorganic Pmentioning

confidence: 99%

Relationship of soil phosphorus fractions to phosphorus soil tests and fertilizer response

McKenzie¹,

Bremer²

2003

Can. J. Soil. Sci.

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“…Morel et al (1989) evaluated the phosphate fixing capacity of soils by the isotopic exchange techniques in northeast France and reported that there was a significant correlation between amount of phosphorus fixed, pH, exchangeable cations, clay content and soluble phosphate. Soon (1990) studied the solubility and retention of phosphates in soils of north western Canada prairies and found that correlations showed between P sorption capacity and clay content. Koenig et al (2000) observed that sampling depths of 10 and 15 cm frequently resulted in lower P fertilizer recommendation than those of 30-cm depth.…”

Section: Introductionmentioning

confidence: 99%

Phosphorus fixing capacity of a volcanic soil on the slope of mount Cameroon

Tening¹,

Foba-Tendo²

2013

ABJNA

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The volcanic soils on the slope of mount Cameroon are deficient in available phosphorus (P) resulting in low productivity. Excess P could be a threat to the aquatic environment. There is therefore need to monitor the P-fixing capacity of these soils with depth. The transformation of applied P in soils from different horizons were examined after treatments with different P rates (0, 20, 60 and 180 mg P L -1 ) and incubation periods (one, three, seven, 14 and 28 days) under laboratory conditions. Phosphorus was extracted on each treatment combination to determine the amount of P fixed. Phosphorus recovered increased with added P. Phosphorus fixed increased with added P and depth throughout the incubation period. The soil showed a high P fixing capacity throughout the different horizons with P fixed varying between 57-99% in the upper horizons and 90-100% in the lower horizons. More than 90% of added P was fixed after one day of incubation. This therefore reduces the threat of eutrophication. Phosphorus fixed correlated positively with clay and pH, and negatively with organic carbon and available P. Clay had a significant (p<0.05) positive correlation with pH values. Clay and pH could therefore be responsible for P-fixation in this soil.

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“…(3) calculado a partir de Fe tc ; intercepção da reta de regressão com os eixos das ordenadas (vide texto). Outros autores encontraram altas correlações entre a adsorção de fósforo e o ferro extraído pelo oxalato de amônio a pH 3 (Bromfield, 1965;Sree Ramulu et al, 1967;Lewis et al, 1981;Molina et al, 1991;Soon, 1991). Uma comprovação da alta capacidade dessa fração dos óxidos de ferro de reagir com o fósforo foi obtida por Syers et al (1971), que encontraram, após remoção da fração dos óxidos de ferro pelo oxalato de amônio a pH 3, redução da adsorção de fósforo em amostras de solos do Rio Grande do Sul.…”

Section: Resultsunclassified