Reaction Products of Applied Orthophosphates in Some Manitoba Soils as Affected by Soil Calcium and Magnesium Content and Time of Incubation

Strong, James E.; Racz, G. J.

doi:10.1097/00010694-197010000-00006

Cited by 7 publications

(2 citation statements)

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“…A higher P concentration was found in MKP than in DKP reaction zones. This is in accordance with the finding that the reaction products CaHP0 4 • 2H 2 0 and MgHP04 • 3H20 persist for a longer period when P is added as MKP rather than as DKP (10). The higher application rates maintain higher reaction zone P concentrations.…”

Section: Discussionsupporting

confidence: 91%

Utilization of Pelleted Phosphorus by Flax, Wheat, Rape, and Buckwheat from a Calcareous Soil¹

Strong¹,

Soper

1973

Agronomy Journal

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Reaction zone root development and P absorption efficiency of roots of flax (Linum usitatissimum L. ‘Redwood’), wheat (Trlticum vulgate L. ‘Manitou’), rape (Brassica napus L. ‘Tanka’), and buckwheat (Fagopyrum esculentum Moench) have been contrasted in order to explain the large variability among them in utilizing P from pellets of KH2PO2 and K2HPO4 in a pot experiment. A large proportion of plant P was extracted from the pelleted applications by rape (40.8 to 57.6%) and buckwheat (33.1 to 55.5%). It is suggested that applied P utilization by rape was enhanced by e~tensive proliferation of its root system detected around points of application of fertilizer pellets. It is suggested for buckwheat, on the other hand, that its utilization of applied P was aided by the high efficiency of its root in absorbing P from high concentrations as indicated in absorption studies using excised roots. Relative to rape or buckwheat a much smaller proportion of plant P was extracted by flax (3.8 to 8.1%) and wheat (12.5 to 19.7%) from P applications. The poorer utilization of applied P by these two crops is considered due to the inability of their root systems to either proliferate extensively or to absorb P efficiently from high P concentrations. It is reasoned that the greater P availability from a 40‐mg P application as KH2PO4 than from a 20‐mg P application as K2HPO4 was due to the higher water‐soluble P level in the reaction zone of the former application, with the two applications spread through the same soil volume. A given P application as K2HPO4 spread through a larger volume of calcareous soil than the same rate of P as KH2PO4. The water‐soluble P level, however, was lower in reaction zones of the former carrier. Thus, the effect of reaction zone size and of its watersoluble P level on the availability of P from KH2PO4, and K2HPO4 pellets offset one another, resulting in a similar availability of the two carriers to the four crops tested.

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Section: Discussionsupporting

confidence: 91%

Utilization of Pelleted Phosphorus by Flax, Wheat, Rape, and Buckwheat from a Calcareous Soil¹

Strong¹,

Soper

1973

Agronomy Journal

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“…The nature of the compounds depends greatly on both fertilizer composition and soil properties, with a large number of compounds being reported in the literature, particularly for neutral to alkaline soils (e.g., Bell and Black, 1977a, b). These precipitated compounds continue to react with soil solution with a change to more stable, less-soluble P compounds with time and as the composition of soil solution changes (Lehr and Brown, 1958;Strong and Racz, 1970;Bell and Black, 1977a. b).…”

Section: Reaction Of P From Water-soluble P Granules or Monocalcium Pmentioning

confidence: 99%

The Chemistry and Agronomic Effectiveness of Phosphate Fertilizers

Bolland

Gilkes

1998

Journal of Crop Production

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Plants take up P from soil solution. so water-soluble P fertilizers are generally more effective than poorly soluble forms. The original sources of P used for agriculture were poorly soluble materials, including manures, bones, guano and phosphate rock. In contrast, highly soluble monocalcium phosphate, monoammonium phosphate and diammonium phosphate are the major compounds present in modern, manufactured solid fertilizers containing water-soluble P. This paper describes how the water-soluble P fertilizers are made. the dissolution of P in the granules of the fertilizers, the reactions of the fertilizer solution with the soil as P moves out of the granule into the soil, the agronomic effectiveness of the fertilizer in the year of application, and in the years after application (residual value). [Article copies ai~ailable for (I fee j b n The Haworth Docrunent Delivery Service: 1-800-342-9678. E-ninil address: getiilfo@hn wortl?pressinc. coni]

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Phosphorus

Hagin¹,

Tucker²

1982

Advanced Series in Agricultural Sciences

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Reaction Products of Applied Orthophosphates in Some Manitoba Soils as Affected by Soil Calcium and Magnesium Content and Time of Incubation

Cited by 7 publications

References 1 publication

Utilization of Pelleted Phosphorus by Flax, Wheat, Rape, and Buckwheat from a Calcareous Soil¹

Utilization of Pelleted Phosphorus by Flax, Wheat, Rape, and Buckwheat from a Calcareous Soil¹

The Chemistry and Agronomic Effectiveness of Phosphate Fertilizers

Phosphorus

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Reaction Products of Applied Orthophosphates in Some Manitoba Soils as Affected by Soil Calcium and Magnesium Content and Time of Incubation

Cited by 7 publications

References 1 publication

Utilization of Pelleted Phosphorus by Flax, Wheat, Rape, and Buckwheat from a Calcareous Soil1

Utilization of Pelleted Phosphorus by Flax, Wheat, Rape, and Buckwheat from a Calcareous Soil1

The Chemistry and Agronomic Effectiveness of Phosphate Fertilizers

Phosphorus

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Product

Resources

About

Utilization of Pelleted Phosphorus by Flax, Wheat, Rape, and Buckwheat from a Calcareous Soil¹

Utilization of Pelleted Phosphorus by Flax, Wheat, Rape, and Buckwheat from a Calcareous Soil¹