Ammonium Effects on Phosphorus Absorption through pH Changes and Phosphorus Precipitation at the Soil‐Root Interface<sup>1</sup>

Miller, M. H.; Mamaril, C. P.; Blair, Graeme J.

doi:10.2134/agronj1970.00021962006200040029x

Cited by 73 publications

(53 citation statements)

References 11 publications

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“…1-6 The N enhancement of total P in the grass species was principally due to an increase in the uptake of fertilizer P and therefore confirms the original observation of Massey and Sheard (1970 Werkhoven and Miller 1960). When the two nutrients are in intimate association, changes in soil pI{ (Miller et al 1970;Riley and Barber 1971) and solubility of P (Bouldin and Sample 1958) within the vicinity of the band and at the soil root interface are possible. The N from the alfalfa which stimulated P uptake in Experiment Leonce and Miller 1966).…”

supporting

confidence: 69%

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Nitrogen Enhancement of Surface Applied Fertilizer Phosphorus Uptake by Forage Species

Sheard¹

1974

Can. J. Soil. Sci.

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Sueeno, R. W. 1974. Nitrogen enhancement of surface appiied fertilizer phosphorus uptake by forage species. Can. J. Soil Sci. 54: 89-104. Nitrogen, supplied as NH,NO., to timothy (Pltlertnt prutense L.) and bromegrass (BrormLts inerntis 1..) or as N derived from alfalfa (Aledicago sativa L.) growing in association with timothy, enhanced the utilization of surface applications of pelleted, "F-labe1led calcium phosphate. 'fhe proportion of the P in timothy derived from a single application of 60 kg P/ha increased from a range ol l6Vo to 2l% without N to a range c,f 38Vo to 43% with an application of 60 kg N/ha before spring growth and repeated after the lirst and second harvests. At the first two harvests, growing timothy in association with alfalfa further increased the proportion. The increase was greater at the second harvest and at the lolver rates of N, amounting to an increase of one-third at applications of 15 and 30 kg Nlha. The proportion of P in the first harvest of bromegrass which was derived frorn a surface application was incleased 176/o ta 26Vo as the rate of P was increased from 40 Analytical Procedures Fertilizer P absorption by the plants was de-termined by measuring the 3'P-activity in 1.5 g, 1.85 cm diam briquets prepared as outlined by MacKenzie and Dean (1950). Standard briquets, containing 0.20Vo P, were prepared by mixing non-labelled plant material with a solution prepared from the original radioactive fertilizer. The "'P-activity of each briquet was measured with an end-window type of GeigerMueller tube.Total N and P were determined on samples which were brought into solution using the wet digestion procedure outlined by Thomas et al. (1967). The concentration of N and P in the digested samples was determined with a Technicon AutoAnalyzer.Analysis of variance was performed on each set of data using the 5Vo level of probability for testing the significance of the variance ratio used in the interpretation of the data. Phosphate Movement StudyNine weeks after the application of fertilizer P in Experiment Two the soil profile from four extra plots receiving 80 kg P/ha, labelled with "'P, and 90 kg N/ha was carefully sectioned to study the movement of the fertilizer P. Following careful removal of plant debris on the surface, a 15 cm' soil column was exposed and sectioned at intervals of 1.5 cm to a depth of 7.5 cm. After air-drying, the soil was ground to pass through a 25-mesh screen.Radioactivity was measured in 3.

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confidence: 69%

“…The influence of N on the availability of P to plants may be associated with the ability of N to increase P solubility at the zone of root contact with the P (Starostka and Hill 1955;Bouldin and Sample 1958) (Miller et al 1970;Riley and Barber 1971).…”

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confidence: 99%

Nitrogen Enhancement of Surface Applied Fertilizer Phosphorus Uptake by Forage Species

Sheard¹

1974

Can. J. Soil. Sci.

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“…This effect has been observed with many NH 4 salts Miller et al 1970;Leikam et al 1983;Sangakkara and Cho 1987;Flaten 1989;Bengtsson et al 1994), and with some non-NH 4 salts Ernani and Barber 1991). The influence is attributed either to chemical effects that alter the dissolution and the mobility of added fertilizer or to physiological effects that change the uptake pattern of P by plants.…”

mentioning

confidence: 72%

Phosphorus diffusion from monocalcium phosphate co-applied with salts in a calcareous soil

Kumaragamage¹,

Akinremi²,

Cho³

et al. 2004

Can. J. Soil. Sci.

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. 2004. Phosphorus diffusion from monocalcium phosphate coapplied with salts in a calcareous soil. Can. J. Soil Sci. 84: 447-458. Mixing non-phosphatic salts with fertilizer P influences the solubility and mobility of P in soils. Little evidence, however, is available regarding the mechanisms causing such effects. The objectives of this study were to investigate the effects of mixing fertilizer P with (NH 4 ) 2 SO 4 , MgSO 4 or (NH 2 ) 2 CO on the diffusion of P in a calcareous soil (Gleyed Rego Black Chernozem), and to identify the causes for such effects. To the surface of 50-mm-long soil columns, maintained at field capacity water content, 32 P-labelled monocalcium phosphate (MCP) was applied alone or in combination with (NH 4 ) 2 SO 4 , MgSO 4 or (NH 2 ) 2 CO. Ratios of applied P:N, P:Mg and P:S were 1:5, 1:4.5 and 1:6, respectively. Extraction and analysis of each 2-mm layer of the columns after incubation for 1, 2, 3, and 4 wk revealed that the addition of (NH 4 ) 2 SO 4 and MgSO 4 with MCP significantly increased P diffusion whereas (NH 2 ) 2 CO had little or no effect. The mechanisms of such effects were identified using a multi-ionic, mechanistic, diffusion model. According to model predictions, the dissolution of MCP was increased by more than twofold when mixed with (NH 4 ) 2 SO 4 and MgSO 4 , and by 1.2-fold when mixed with urea. The main difference between SO 4 salts and urea in affecting P diffusion was the competition between the anion of the salt and P for precipitation with Ca. Sulphate competed strongly with P, reducing the precipitation of Ca phosphates. Application of urea increased soil pH initially, but eventually soil pH decreased with nitrification of NH 4 . Initial increase in pH to above 8.0 favoured precipitation of Ca phosphate, but the pH was not high enough to favour CaCO 3 precipitation. The application of P fertilizers with fertilizers containing SO 4 could be beneficial in calcareous soils due to enhancement of P solubility and mobility. Mélanger des sels non phosphatés à un engrais phosphaté (P) modifie la solubilité et la mobilité du P dans le sol. Toutefois, on sait peu de choses sur les mécanismes à l'origine de ce phénomène. L'étude devait préciser comment le fait de mélanger un engrais P avec du (NH 4 ) 2 SO 4 , du MgSO 4 ou du (NH 2 ) 2 CO agit sur la diffusion du P dans un sol calcaire (tchernoziom noir gléyifié Rego) et établir les causes des modifications observées. À cette fin, les auteurs ont appliqué du phosphate monocalcique (PMC) marqué au 32 P avec ou sans (NH 4 ) 2 SO 4 , MgSO 4 ou (NH 2 ) 2 CO au sommet de colonnes de sol de 50 mm de hauteur dont la teneur en eau était maintenue à la capacité maximale du terrain. Les ratios appliqués étaient respectivement de 1:5, 1:4,5 et 1:6 pour P:N, P:Mg et P:S. Après incubation pendant 1, 2, 3 ou 4 semaines, l'extraction et l'analyse de chaque tranche de 2 mm des colonnes révèle que l'addition de (NH 4 ) 2 SO 4 et de MgSO 4 au PMC accroît sensiblement la diffusion du P alors que le (NH 2 ) 2 CO n'a pas d'effet sur ce phénom...

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“…Despite the obvious importance of this phenomenon, there is little precise morphological information about how the proliferation is effected. Duncan and Ohlrogge (1958), Miller, Mamaril, and Blair (1970), Passioura and Wetselaar (1972), and others have recorded many important observations, but their experiments were not primarily designed to demonstrate the sequence of morphological events. With the aim of developing an approach by which these events might be studied more precisely, a morphological investigation was made of the effects of locally applied nitrate ions on the branching of wheat root axes.…”

Section: Introductionmentioning

confidence: 99%

A Method of Applying Nutrients Locally to Roots Under Controlled Conditions, and Some Morphological Effects of Locally Applied Nitrate on the Branching of Wheat Roots

Hackett¹

1972

Aust. Jnl. Of Bio. Sci.

113

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A method has been developed for examining the effect of locally applied ions on the initiation and early extension growth of first-order laterals of wheat roots. Features of the method are the avoidance of sealing, flexibility in the positioning of treatments, and freedom to examine the root systems during growth.In experiments in which nitrate was applied 4-5 days after germination, nitrate increased the density of branching when it was placed within 10 mm of the tip of the root axis. The response was confined to this portion. Nitrate also stimulated the extension growth of the laterals, whether or not it had been present at the time of their initiation. Again the response was confined to laterals in the region supplied with nitrate even though large quantities were absorbed and translocated to the shoot.

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Ammonium Effects on Phosphorus Absorption through pH Changes and Phosphorus Precipitation at the Soil‐Root Interface¹

Cited by 73 publications

References 11 publications

Nitrogen Enhancement of Surface Applied Fertilizer Phosphorus Uptake by Forage Species

Nitrogen Enhancement of Surface Applied Fertilizer Phosphorus Uptake by Forage Species

Phosphorus diffusion from monocalcium phosphate co-applied with salts in a calcareous soil

A Method of Applying Nutrients Locally to Roots Under Controlled Conditions, and Some Morphological Effects of Locally Applied Nitrate on the Branching of Wheat Roots

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Ammonium Effects on Phosphorus Absorption through pH Changes and Phosphorus Precipitation at the Soil‐Root Interface1

Cited by 73 publications

References 11 publications

Nitrogen Enhancement of Surface Applied Fertilizer Phosphorus Uptake by Forage Species

Nitrogen Enhancement of Surface Applied Fertilizer Phosphorus Uptake by Forage Species

Phosphorus diffusion from monocalcium phosphate co-applied with salts in a calcareous soil

A Method of Applying Nutrients Locally to Roots Under Controlled Conditions, and Some Morphological Effects of Locally Applied Nitrate on the Branching of Wheat Roots

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Ammonium Effects on Phosphorus Absorption through pH Changes and Phosphorus Precipitation at the Soil‐Root Interface¹