Management Considerations for Acid Soils with High Phosphorus Fixation Capacity

Sánchez, Pedro A.; Uehara, G.

doi:10.2134/1980.roleofphosphorus.c18

Cited by 92 publications

(39 citation statements)

References 69 publications

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“…According to Sanchez and Uehara (1980), soils (SC2, SC3, SC4, SC5, SC6, SC7, SD1, SD2, SD3, SD4 and SD5) that adsorb less than 150 mg P kg −1 soil to meet the SPR f value of 0.2 mg L −1 in soil solution were considered to be low adsorbing soil and the other adsorbing an amount exceeding this value was high P adsorbing ones (SC1). Furthermore, the results of the current study on the subject of SPR of these soils presented a comparable result with those found by Asmare (2014); Zinabu (2015) and Duffera and Robarge (1999) in different highly weathered acidic soils of Ethiopia (42-175 mg P kg −1 ) in West Africa (Abekoe and Sahrawat 2001).…”

Section: Standard Phosphorus Fertilizer Requirements (Spr)mentioning

confidence: 99%

Phosphorous status and adsorption characteristics of acid soils from Cheha and Dinsho districts, southern highlands of Ethiopia

et al. 2018

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Background: Though soils in the study areas are characterized by higher iron and aluminum oxides, and low available P contents, study on P adsorption characteristics is limited. The purpose of this experiment was to evaluate adsorption properties of selected soils and determine the standard phosphorous requirements of the soils. In this experiment, separately weighed 2 g soil samples were equilibrated in 50 ml of 0.01 M CaCl 2 solution containing KH 2 PO 4 at rates of 0, 1, 2.0, 4.0, 8.0, 16.0, 24.0, and 32.0 mg P L −1 .Results: The Freundlich model was found to be the best model for the description of the P adsorption characteristics of the soils. The Freundlich coefficient K f ranged from 123.32 to 315.31 mg P kg −1 . The Goha-1 soil had the highest K f (315.31 mg P kg −1 ) as Ketasire had lowest K f (123.32 mg P kg −1 ) values. The value of SPR f was ranged from 50.50 to 154.02 mg P kg −1 for soils of the study area. Highly significant (P ≤ 0.01) correlation was observed between the Freundlich adsorption parameters and soil physicochemical properties. Conclusion:The standard P requirement of the studied soils was higher than the blanket P fertilizer rate recommendations in Ethiopia. Lack of inadequate knowledge about internal and external P requirement of each crop might have decreased yield in the study areas as it could have resulted in under-application of fertilizer P. The presence of high correlation between the adsorption parameters and the soil properties suggested the indices' prominent role in explaining P adsorption characteristics of the soils. Since higher dose of P is required by soils in the study area because of fixation, alternative P management strategies is needed to reduce P adsorption and enhance P availability. which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Section: Standard Phosphorus Fertilizer Requirements (Spr)mentioning

confidence: 99%

Phosphorous status and adsorption characteristics of acid soils from Cheha and Dinsho districts, southern highlands of Ethiopia

et al. 2018

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“…It is often found that sorption of phosphate is decreased if the pH is increased (reviewed by Sanchez & Uehara, 1980), but the effects only become large if high pH values are used. In some cases, however, the effect of increasing the pH is to increase phosphate sorption (Amarasiri & Olsen, 1973).…”

Section: The Observations To Be Describedmentioning

confidence: 99%

A mechanistic model for describing the sorption and desorption of phosphate by soil

Barrow

2015

European J Soil Science

104

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Summary A model of phosphate reaction is constructed and its output compared with observations for the sorption and desorption of phosphate by soil. The model has three components: first, the reaction between divalent phosphate ions and a variable‐charge surface; second, the assumption that there is a range of values of surface properties and that these are normally distributed; third, the assumption that the initial adsorption induces a diffusion gradient towards the interior of the particle which begins a solid‐state diffusion process. The model closely describes the effects on sorption of phosphate of: concentration of phosphate, pH, temperature, and time of contact. It also reproduces the effects on desorption of phosphate of: period of prior contact, period and temperature of desorption, and soil: solution ratio. The model is general and should apply to other specifically adsorbed anions and cations. It suggests that phosphate that has reacted with soil for a long period is not ‘fixed’ but has mostly penetrated into the soil particles. The phosphorus can be recovered slowly if a low enough surface activity is induced.

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“…Conflicting reports, however, are found in the literature on the effect of pH on phosphate adsorption, especially when liming is used as a practice to adjust soil pH. In a recent review, Sanchez and Uehara (1980) concluded that a considerable controversy exists in the litera ture regarding whether or not liming decreases phosphate fixation.…”

Section: Hpo^mentioning

confidence: 99%

Effect of pH and exchangeable metals on phosphate adsorption by soils

Razaq

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Management Considerations for Acid Soils with High Phosphorus Fixation Capacity

Cited by 92 publications

References 69 publications

Phosphorous status and adsorption characteristics of acid soils from Cheha and Dinsho districts, southern highlands of Ethiopia

Phosphorous status and adsorption characteristics of acid soils from Cheha and Dinsho districts, southern highlands of Ethiopia

A mechanistic model for describing the sorption and desorption of phosphate by soil

Effect of pH and exchangeable metals on phosphate adsorption by soils

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