EFFECTS OF pH ON PHOSPHATE SORPTION OF SOME PALEUDULTS OF SOUTHERN NIGERIA

Eze, O. C.; Loganathan, P.

doi:10.1097/00010694-199009000-00007

Cited by 14 publications

(9 citation statements)

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“…Loganathan et al (1987) reported similar observation in some soils from southern Nigeria. It also seems that soil pH has pronounced influence on phosphorus availability in weathered tropical soils only under conditions of high phosphorus levels attained by addition of phosphorus solution to soil (Eze and Loganathan, 1990), or when soils are treated with liming materials to enhance normal distribution of their pH values (Sato and Comerford, 2005).…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, the relationships between soil pH and phosphorus availability have been extensively studied on tropical soils (Mokwunye, 1975;Eze and Loganathan, 1990; Sato and Comerford, 2005; among others), and some of such studies show that the low availability of phosphorus in tropical soils is often exacerbated by the acidic nature of the soils (e.g., Sato and Comerford, 2005). Yet, as with phosphorus availability, there is paucity of data about the influence of air-drying soil samples before analysis on soil reaction in tropical soils.…”

Section: Introductionmentioning

confidence: 99%

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Air-Drying Effect on Soil Reaction and Phosphorus Extractability From Upland-Lowland Tropical Soils as Related to Their Colloidal Stability

Obalum¹

2017

Appl Ecol Env Res

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Abstract. Although air-drying is a universally accepted practice for preserving soils before analyses, it can irreversibly affect certain soil processes and, hence, results of soil analyses. Reports about such effects on extractable/available phosphorus (P av ) are conflicting and are scanty for low-P av tropical soils. Moreover, little is known about its relative effects for well and poorly drained soils or about any underlying role of soil colloidal stability. In this study, soil samples from well-drained uplands and adjoining poorly drained lowlands in four locations in southeastern Nigeria were analysed field-moist and air-dried for pH and P av . The soils are mostly medium-textured. A trend existed of drying-induced decreases in soil pH for both uplands (4.8-5.8) and lowlands (4.6-5.6); whereas this effect was consistently non-significant in the former (unless tested for irrespective of location, 5.35 vs 5.53), it was location-specific in the latter. Airdrying tended to increase and decrease P av in upland soils (0.62-12.75 mg kg -1 ) and lowland soils (0.93-20.52 mg kg -1 ), respectively, with a reverse effect in one lowland with values exceeding 15 mg kg -1 . However, these effects were non-significant except in one upland soil with evidence of appreciable organic matter. Correlations between soil pH and P av were positive and non-significant, but strongest for field-moist lowland soils. Soil colloidal stability indices of water-dispersible clay and clay flocculation index proved useful in understanding the results for soil pH and P av , respectively, with the effect of the former being more distinct than that of the latter. Air-drying is still recommended only for upland soils while we explore fully the interrelationships among drying-induced differences and colloidal stability for soils of contrasting drainage status.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Air-Drying Effect on Soil Reaction and Phosphorus Extractability From Upland-Lowland Tropical Soils as Related to Their Colloidal Stability

Obalum¹

2017

Appl Ecol Env Res

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“…It has been found that calcium played a significant role in influencing the chemisorptions at different pH values [24]. At the pH range of 5.0-6.0 the increase in P adsorption can be attributed to the formation of basic calcium phosphorus complex at the surface of col loid [44,[58][59] and to the formation of precipitates of these compounds in solution at pH values near neutral [60].…”

Section: +mentioning

confidence: 99%

“…At the pH range of 5.0-6.0 the increase in P adsorption can be attributed to the formation of basic calcium phosphorus complex at the surface of col loid [44,[58][59] and to the formation of precipitates of these compounds in solution at pH values near neutral [60]. Calcium ion is specifically adsorbed on oxide and clay surfaces at pH values above 6.0, and it helps the adsorption of P by forming the surface complexes of basic calcium phosphorus at high concentrations of Ca 2+ [61][62], thus Ca 2+ fits in the cavity between two adjacent P ions and as a result reducing the electrostatic repulsion between the negatively charged ions, allowing more P to be adsorbed [24]. The results of the present study are in agreement with what have been intensively discussed by a number of researchers.…”

Section: +mentioning

confidence: 99%

“…There is also some evidence to show that phosphorus sorption decreased with increase in pH up to 5.0-6.0, beyond which it increased to be due largely to the difference in the exchangeable Al values of the soils [17,23], whereas Barrow [17] cites at least six factors to be responsible. In the experiment from Eze and Loganathan [24], they found the results of quantity of the P adsorption under the different effects including ionic strength and pH.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of Phosphorus by Modified Clay Mineral Waste Material Relating to Removal of it from Aquatic System

Jiang¹,

Su²,

Ruan

et al. 2014

IJEMA

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This study examined the application of modified clay mineral waste material (MCMWM) for removal of phosphorus (P) from aquatic systems including surface water and wastewater related to the application of recycled solid waste materials. The effects of ionic strength and pH on P adsorption by MCMWM were investigated at pH values of 3, 5, 6, 7 and 9 with P concentrations of 10, 20, 40, 100 and 200 mg/L in solution. The P adsorption was rapidly at the early stage with 95% of P in solution being adsorbed for 10 mg/L P in solution at a high pH range within 0.5 hr. The amount of P adsorbed increased with increasing ionic strength. The amount of P adsorbed increased continuously as pH values increased from 3 to 9 for P adsorption at 10 mg/L. Other series of P concentrations in solution showed variable trends due to the rates of P adsorption being affected by pH associated with the effect of ionic strength. The maximum amounts of P adsorbed and the highest percentages of P adsorbed were obtained at pH 9 for all levels of P concentrations, and at pH 7 for the lower P concentrations in solution. Calcium (Ca) ion was found to form a bridge for P adsorption in solution as the increases in the amount of P adsorbed at high pH values was related to the performance of Ca in favoring P to be adsorbed either onto the surfaces or incorporated into the structural bonds of MCMWM. Ionic strength, pH and modification process have been found to be the important factors that influenced P adsorption in solution.

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Interaction of urea with triple superphosphate in a simulated fertilizer band

Fan

MacKenzie

1993

Fertilizer Research

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EFFECTS OF pH ON PHOSPHATE SORPTION OF SOME PALEUDULTS OF SOUTHERN NIGERIA

Cited by 14 publications

References 0 publications

Air-Drying Effect on Soil Reaction and Phosphorus Extractability From Upland-Lowland Tropical Soils as Related to Their Colloidal Stability

Air-Drying Effect on Soil Reaction and Phosphorus Extractability From Upland-Lowland Tropical Soils as Related to Their Colloidal Stability

Adsorption of Phosphorus by Modified Clay Mineral Waste Material Relating to Removal of it from Aquatic System

Interaction of urea with triple superphosphate in a simulated fertilizer band

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