Phosphate Sorption Characteristics of Some Bench-Mark Soils of West Africa

Juo, A. S. R.; Fox, R. L.

doi:10.1097/00010694-197712000-00010

Cited by 155 publications

(72 citation statements)

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“…The MPAC ranged from 283.0 to 2635.7 mg kg -1 for RH 3 and TH, respectively. Juo and Fox (1977) proposed a classification of soils with respect to their MPAC, considering soils with very high sorption those that adsorb more than 1000 mg kg -1 of P and as high sorption, those that adsorb between 500 and 1000 mg kg -1 of P. It can be seen that, in the present study, that almost all the soils, with the exception of RH, are classified as high sorption.…”

Section: Resultsmentioning

confidence: 55%

P-sorption and desorption in Savanna Brazilian soils as a support for phosphorus fertilizer management

et al. 2013

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Phosphorus (P) sorption by soils is a phenomenon that varies depending on soil characteristics, influencing its intensity and magnitude, which makes it a source or drain of P. The objective of this study was to determine the Maximum Phosphorus Adsorption Capacity (MPAC) and desorption of P from soils under native Savanna Brazilian and verify the correlation between MPAC and P Capacity Factor (PCF) with the chemical and physical properties of these soils. The study was conducted in seven soils under native Savannas. The Langmuir isotherms were adjusted from the values obtained in sorption assays, being evaluated the MPAC, the energy adsorption (EA) and PCF, which was calculated according to the levels of P-adsorbed and P-sorbed. Values of MPAC were classified as high in most soils, ranging from 283 up to 2635 mg kg -1 of P in the soil and were correlated with soil organic matter, clay, silt, sand, base saturation and pH. The PCF was higher in soils where the MPAC was also higher. The use of only one attribute of soil (clay content) as a criterion for the recommendation of phosphated fertilization, as routinely done, is susceptible to errors, needing the use of more attributes for a more accurate recommendation, as a function of the complexity of the interactions involved in the process.Index terms: Phosphorus adsorption capacity, langmuir, soil fertility management, correction of P deficiency. RESUMOA sorção do fósforo (P) pelo solo é um fenômeno que varia em função das características do solo, influenciando sua intensidade e magnitude, tornando-o fonte ou dreno de P. Neste estudo, objetivou-se quantificar a sorção e dessorção de P e avaliar as interações entre estas e os atributos físicos e químicos dos solos. O estudo foi realizado em sete solos sob vegetação nativa de Cerrado. As isotermas de Langmuir foram ajustadas a partir dos valores de sorção obtidos, sendo avaliados a Capacidade Máxima de Adsorção de Fósforo (CMAP), a Energia de Adsorção (EA) e o Fator Capacidade de Fósforo (FCP), o qual foi calculado em função dos teores de P-sorvido e P-dessorvido. Os valores da CMAP foram classificados como altos na maioria dos solos, variando de 283 até 2635 mg kg -1 de P no solo e se correlacionaram com os teores de matéria orgânica, argila, silte, areia, saturação por bases e pH. O FCP foi maior nos solos onde se obteve maior CMAP. A utilização de apenas um atributo de solo (teor de argila) como critério de recomendação da adubação fosfatada, como rotineiramente tem sido realizada, apresenta-se suscetível a erros, necessitando da utilização de mais atributos para uma recomendação mais acurada, em função da complexidade das interações envolvidas no processo.

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Section: Resultsmentioning

confidence: 55%

P-sorption and desorption in Savanna Brazilian soils as a support for phosphorus fertilizer management

et al. 2013

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“…Organic molecules released on decomposition of organic matter form complexes with Fe and Al in the soil thereby blocking the sites which are mainly responsible for fixation of phosphorus in the soil (Juo and Fox, 1977;Subramanian and Kumaraswamy, 1989;Brouwere et al, 2003;Ghosal et al, 2011). Banik et al (2006) also showed that addition of organic manure markedly increased the availability of phosphorus in the soil.…”

Section: Resultsmentioning

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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“…The amount of P adsorbed at 0.2/xgm1-1 equilibrium solution P concentration by all the soils ranged from 34.3 to 79.5/xg g-a soil ( Table 2, Fig. 1) and can be rated as low according to the criterion suggested by Juo and Fox [16]. The amounts of P adsorbed by the soils were similar for both potassium dihydrogen phosphate and ammonium polyphosphate as the sources of P. The adsorption of P by a Vertisol (BR-1) fertilized with different rates of P (0, 10, 20, and 40kgha -1) in the previous season was similar (34.3-41.3 ttg g-i soil) indicating little effect of P fertilization on its adsorption (Table 2, Fig.…”

Section: Phosphorus Adsorptionmentioning

confidence: 95%

Adsorption and desorption of phosphate in some semi-arid tropical Indian Vertisols

Shailaja

Sahrawat

1990

Fertilizer Research

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Adsorption and desorption of phosphorus in soils are among the key processes governing its availability to crops. There have been very few studies on the phosphorus adsorption and desorption characteristics of Vertisols. The P adsorption and desorption characteristics of four Vertisols belonging to three agriculturally important soil series were studied. The amounts of P adsorbed by the soils at 0.2/xg ml -I equilibrium solution P concentration was low and ranged from 34.3 to 79.5/xg g-1 soil. The phosphate adsorption was very well described by Langmuir and Freundlich isotherms. The P adsorbed by a Vertisol (BR-1) fertilized with different rates of P in the previous season (0, 10, 20 and 40 kg P ha -1) was similar (34.3-41.3/xgg -1 soil) indicating little effect of fertilization on P adsorption. The correlation studies indicated that the DTPA-extractable Fe was the most important factor accounting for P adsorption in these soils. Clay and CaCO 3 content were found to be relatively less important factors affecting P adsorption in the soils studied.The capacity of the two extractants and EUF (electro-ultrafiltration) to desorb the adsorbed P followed the order: EUF (400V, 80°C)> sodium bicarbonate > EUF (200V, 20°C)> calcium chloride. The average amounts of P desorbed from the four Vertisols using these methods were 74, 63, 50, and 3% respectively of the adsorbed P. In the Begamganj soil, the amount of P desorbed by EUF (400V, 80°C) exceeded 100%, indicating that all of the adsorbed P was desorbable including some native P.In conclusion the results of our study show that the Vertisols studied have low phosphate adsorption capacity and that the P they adsorbed is easily desorbable.

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Phosphate Sorption Characteristics of Some Bench-Mark Soils of West Africa

Cited by 155 publications

References 0 publications

P-sorption and desorption in Savanna Brazilian soils as a support for phosphorus fertilizer management

P-sorption and desorption in Savanna Brazilian soils as a support for phosphorus fertilizer management

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

Adsorption and desorption of phosphate in some semi-arid tropical Indian Vertisols

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