Some Reactions of Phosphate With Clays and Hydrous Oxides of Iron and Aluminum

Haseman, J. F.; Brown, Earl H.; Whitt, Carlton D.

doi:10.1097/00010694-195010000-00002

Cited by 91 publications

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“…The dissolution was a slow process, thereby the solution equilibrium with respect to soluble mineral components is not a factor in determining stability (Bloom and Nater 1991). The dissolution of Al and Fe oxides, kaolinite, montmorillonite and illite by phosphate was reported before (Low and Black 1947;Haseman et al 1950;Kittrick and Jackson 1954, 1955). The present study indicates that phosphate can induce the dissolution of the primary K-bearing minerals and enhance their K-supplying rate.…”

Section: Mechanisms Of Monoammonium Phosphateinduced K Release From Tsupporting

confidence: 68%

Kinetics and mechanisms of monoammonium phosphate-induced potassium release from selected potassium-bearing minerals

Zhou¹,

Huang²

2006

Can. J. Soil. Sci.

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Zhou, J. M. and Huang, P. M. 2006. Kinetics and mechanisms of monoammonium phosphate-induced potassium release from selected potassium-bearing minerals. Can. J. Soil Sci. 86: 799-811. A high concentration of phosphate in the immediate vicinity of the phosphate fertilizer zone of soil could induce K release from K-bearing minerals to soil solution. In this study, the kinetics of K release by monoammonium phosphate (NH 4 H 2 PO 4 ) from biotite, muscovite, and microcline were investigated. The results indicate that K release from all of these minerals was promoted by 1 M NH 4 H 2 PO 4 (pH 4.0). The release of K from these minerals can be described by the zero-order rate equation. The rate coefficients of K released from the minerals (2-5 µm) in 1 M NH 4 H 2 PO 4 solution ranged from 0.20 to 2.09 mg kg -1 h -1 at 25°C and from 1.22 to 9.00 mg kg -1 h -1 at 45°C, respectively. The amount of K release from the same mineral samples in 1 M NH 4 Cl solution (pH 4.0) at 25°C was not detectable and was too low to be determined accurately at 45°C. The differences in the rate of NH 4 H 2 PO 4 -induced K release from the different minerals were explained by the chemical composition, crystal structure, and the crystallization sequence of the minerals. The activation energies of the phosphate-induced K release from these minerals ranged from 37 to 72 kJ mol -1 and the pre-exponential factor values (Arrhenius equation) ranged from 1.2 × 10 6 to 7.2 × 10 11 mg kg -1 h -1 . The examination of the phosphate-reacted minerals shows the formation of crystalline NH 4 -taranakite in the muscovite and microcline systems and noncrystalline products in the biotite system. The absence of the formation of crystalline NH 4 -taranakite in the biotite system is attributed to the Fe perturbation. These data indicate that the major mechanism of NH 4 H 2 PO 4 -induced K release from the K-bearing minerals was the combined effect of phosphate and protons on the alteration of minerals. Therefore, the K-supplying rate of soils in the immediate vicinity of fertilizer zones may be enhanced through phosphate fertilization. . Une concentration élevée de phosphate à proximité immédiate de la zone où l'on dépose les engrais phosphatés pourrait déclencher la libération de potassium des minéraux qui en renferment dans la solution de sol. Dans le cadre de cette étude, les auteurs ont examiné la cinétique d'une telle libération, engendrée par du phosphate d'ammonium diacide (NH 4 H 2 PO 4 ) dans de la biotite, de la muscovite et de la microcline. Les résultats indiquent que le NH 4 H 2 PO 4 1 M (pH 4,0) libère du K de ces minéraux. On peut décrire ce phénomène au moyen d'une équation d'ordre zéro exprimant le taux de libération. Les coefficients du taux de libération du K par ces minéraux (2 à 5 µm) dans une solution de NH 4 H 2 PO 4 1 M varient de 0,20 à 2,09 mg par kg et par heure à 25°C et de 1,22 à 9,00 mg par kg et par heure à 45°C, respectivement. La quantité de K libérée par les mêmes échantillons dans la solution de NH 4 H 2 PO 4 1 M (pH 4,0) à 25°C n...

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Section: Mechanisms Of Monoammonium Phosphateinduced K Release From Tsupporting

confidence: 68%

Kinetics and mechanisms of monoammonium phosphate-induced potassium release from selected potassium-bearing minerals

Zhou¹,

Huang²

2006

Can. J. Soil. Sci.

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“…1. As compared with doses used in the fertilization practice, the added amounts of phosphorus were very high; 1 mmol of P per kg soil corresponds to 62 kg per hectare (bulk density of soil 1 kg/dm 3 , the depth of plough Haseman et al (1950), the most rapid sorption of phosphate takes place in as little as half an hour. Rajan and Watkinson (1976) considered a reaction time of three hours to be sufficient, because allophane samples studied retained during this time 80 % of the phosphate sorbed during four days.…”

Section: Resultsmentioning

confidence: 99%

“…Rajan and Watkinson (1976) considered a reaction time of three hours to be sufficient, because allophane samples studied retained during this time 80 % of the phosphate sorbed during four days. According to Olsen and Watanabe (1957), phosphate sorbed during one day is 84 -100 % of that sorbed during three days, and is exchangeable by 32 P. After the rapid initial reaction, the sorption of phosphate can proceed slowly for weeks, but then not only surface adsorption is involved (Haseman et al 1950, Olsen and Watanabe 1957, Juo and Maduakor 1974.…”

Section: Resultsmentioning

confidence: 99%

Sorption capacity of phosphate in mineral soils: I Estimation of sorption capacity by means of sorption isotherms

Niskanen

1990

AFSci

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Abstract. The sorption capacity ofphosphate in seven soil samples (clay content I-7o %, organic carbon content 0.8-10.7 %, soil pH 4.2-5.3, oxalate-extractable Al 11-222 and Fe 11-202 mmol/kg soil) was studied by means of sorption isotherms. The soils were equilibrated, for two to seven days at + 5 and + 20°C, with solutions containing phosphate o -l o 0 -10 mmol/1 (0 -200 mmol/kg soil) at a constant ionic strength of 0.01 . Prolongation of the reaction time increased the sorption of phosphate only partially. The rise in temperature, from + 5 to + 20°C, increased the sorption from higher phosphate concentrations. At + 20°C, the sorption curves of three soils showed a sorption maximum of 4, 19 and 34 mmol/kg soil. The sorption data of six soils was in accordance with the Langmuir equation; the sorption maximum ranged from 15 to 119 mmol/kg soil, and were of the same magnitude as the maximums determined experimentally.

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“…Most reaction products, nature of reactions, and factors affecting it, were recognized. It was found that these reactions were rapid and the water soluble phosphate compounds, rapidly convert to relatively insoluble phosphate compounds in a matter of few hours of their application to soil [3], [4].These rapid reactions of phosphate fertilizer applied to soil minimize efficiency of phosphate fertilizers which are mainly calcium phosphate or ammonium orthophosphate, like Triple super phosphate (TSP) or Mono ammonium phosphate (MAP) [5]. For that reason, efficiency of TSP fertilizer is low in calcareous soils and does not exceed 30%.Calcareous soils reduce the efficiency of P fertilizers due to rapid reactions between P applied and indigenous Ca present in soil [6], [7].…”

Section: Introductionmentioning

confidence: 99%

Agronomic Effectiveness of Phosphate Applied As Pyrophosphate for Corn in Calcareous Soils

Muhawish¹

2017

IOSR JAVS

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Some Reactions of Phosphate With Clays and Hydrous Oxides of Iron and Aluminum

Cited by 91 publications

References 0 publications

Kinetics and mechanisms of monoammonium phosphate-induced potassium release from selected potassium-bearing minerals

Kinetics and mechanisms of monoammonium phosphate-induced potassium release from selected potassium-bearing minerals

Sorption capacity of phosphate in mineral soils: I Estimation of sorption capacity by means of sorption isotherms

Agronomic Effectiveness of Phosphate Applied As Pyrophosphate for Corn in Calcareous Soils

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