Phosphorus Availability, Crop Response to Ammoniated Superphosphates and Dicalcium Phosphate, as Affected by Granule Size, Water Solubility, and Time of Reaction with Soil

Terman, G. L.; DeMent, J. D.; Clements, L. B.; Lutz, J. A.

doi:10.1021/jf60107a003

Cited by 13 publications

(7 citation statements)

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“…In the pot trials a very narrow range of pellet size was used, while in the field trials the pelletised Calciphos was used "as received"; and since it contained an appreciable amount of material minus 100 mesh B.S.S., this could be the main source of the response recorded. These results are in line with the conclusions of Terman et al (1960) and van Burg (1963) with regard to pelletising water-insoluble phosphates.…”

Section: Discussionsupporting

confidence: 92%

Agronomic use of calcined christmas island iron/aluminium phosphates

Buchan¹,

Müller

Rogers

et al. 1970

New Zealand Journal of Agricultural Research

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Glasshouse pot trials with ryegrass, subterranean clover, and radish as indicator plants showed that calcined Christmas Island iron/aluminium phosphates (Calciphos) when finely ground and mixed into the soil gave yields equal to those from the use of granulated superphosphate. Localising the powder in spots significantly reduced the yields only in early harvests. Plant response was greatest to material calcined between 500°c and 700°c, and yields were lower from material calcined below 500'c than from that calcined above 700°c. In pot trials pelletising Calciphos severely reduced yields. Bentonite, smectite, and sulphur were added in varying proportions to Calciphos in an attempt to make pellets which readily disintegrated on moist soil, so making the phosphate more available to plants. The improvement obtained was not sufficient to warrant the extra cost of pellet formulation and decrease in phosphate content.

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Section: Discussionsupporting

confidence: 92%

Agronomic use of calcined christmas island iron/aluminium phosphates

Buchan¹,

Müller

Rogers

et al. 1970

New Zealand Journal of Agricultural Research

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“…Granulation or pelletising of this powder would be one solution. Previous work in granulating water-insoluble materials such as North Mrican phosphates, basic slag, etc., has been reported by Mattingly (1963), Terman et al (1960), and van Burg (1963) among many others. Invariably as particle size was increased crop response decreased in their trials.…”

Section: Introductionsupporting

confidence: 51%

“…Though the increased response relative to the 41 % for AMDL hard pellets reported in Trial B seems significant compared to superphosphate, it is still so poor that from commercial and agronomic viewpoints there appears to be little prospect in this line of research. DISCUSSION Calcium phosphates, by reaction with the iron and aluminium in acid mineral soils, change, more or less rapidly depending on their solubility, to less available phosphates of calcium, iron, and aluminium (Terman et al 1960) which resemble the amorphous calcium, iron, and aluminium phosphate in Calciphos. Pasture plants obtain a substantial portion of their phosphate requirements from these reaction products (Terman 1968), greater yields being obtained from pastures which have received repeated applications of phosphates (Cooke 1966).…”

Section: Trial Bmentioning

confidence: 99%

Agronomic use of calcined christmas island iron/aluminium phosphates i. field trials

Müller

1970

New Zealand Journal of Agricultural Research

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Christmas Island "c" ore when calcined at 550°c contains up to 24% aluminium and iron and 15% phosphorus which is not water-soluble but is up to 95% soluble in neutral ammonium citrate. Samples vary in total phosphorus content and in the percentage of phosphorus soluble in neutral ammonium citrate, depending on the proportions of crandallite, millisite, and apatite in the "c" ore sample. In field trials at Otara finely ground calcined "c" ore-"Calciphos"-gave yields equal to or slightly less than those obtained from superphosphate on both limed and unlimed plots at equal rate of applied P. Yields with a mixture of Calciphos powder and mature superphosphate (1: 1) were equal to, or better than, those from superphosphate alone. Pelletising the finely ground Calciphos reduced pasture responses to 41 % of those obtained from granulated superphosphate. Materials containing the highest percentage of phosphorus soluble in neutral ammonium citrate d(' not necessarily give highest yields, indicating that other factors besides the neutral ammonium citrate solubility may be involved.

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“…The phosphates were applied as fine powders ( -100 mesh) in amounts to supply 60 mg. of total phosphorus, P, per pot ( " Based on yields of oats (dry matter) as follows: 7.4 grams per pot with no P and limiting yield of 18.2 grams on Floyd sil, and 3.9 grams with no P and limiting yield of 26.5 grams on Ida sil. 6 Numbers refer to Table I. a Based on cumulative yields of dry matter by oats followed by sudangrass, millet sudangrass.…”

Section: Aosp + Anmentioning

confidence: 99%

“…Crop response to water- soluble phosphorus (monoammonium phosphate) depended upon its content per granule, and response to waterinsoluble phosphorus (dicalcium phosphate) depended upon the surface area of the granules. Finely divided dicalcium phosphates have been shown in several experiments (6) to be much more available to various crops than their water solubility would indicate. Crop response to water-soluble vs. water-insoluble phosphorus in fertilizers is also influenced by the extent to which the phosphorus reacts with the soil (6).…”

mentioning

confidence: 99%