Comparison of efficiency of Mussoorie partially acidulated phosphate rock and single superphosphate in a shallow Alfisol of the Indian semiarid tropics

The agronomic performances of some longlife superphosphate (LSP) and partially acidulated phosphate rock (PAPR) fertilizers were compared with single superphosphate in glasshouse pot trials over 9-10 months using a range of New Zealand soils. The fertilizers used differed in the type (origin) of phosphate rock (PR), the acid to rock ratio used in the production of LSP, percentage acidulation of PAPR, and incorporation of elemental sulfur into LSP. The agronomic effectiveness of the fertilizers studied was primarily influenced by the type of PR and percentage acidulation of PAPR, but not by the acid to rock ratio. Variations in the agronomic effectiveness of LSP and PAPR fertilizers made from different PRs did not reflect the relative solubilities of the original PRs. This was mainly attributed to alterations in the chemistry and consequent solubility of PR which occurred during fertilizer manufacture. Plant phosphorus uptake was highly correlated with fertilizer solubility in 2% citric and 2% formic acids. The relative agronomic effectiveness of LSP and PAPR fertilizers was not significantly related to any single soil property.

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Effect of fertiliser type on cadmium and fluorine concentrations in clover herbage

Australian Journal of Experimental Agriculture ◽

10.1071/ea96117 ◽

1997 ◽

Vol 37 (8) ◽

pp. 1019 ◽

Cited By ~ 20

Author(s):

M. J. McLaughlin ◽

P. G. Simpson ◽

M. K. Smart ◽

N. Fleming ◽

D. P. Stevens ◽

...

Keyword(s):

North Carolina ◽

Phosphate Rock ◽

Partially Acidulated Phosphate Rock ◽

Single Superphosphate ◽

North Carolina Phosphate Rock ◽

Reactive Phosphate ◽

Reactive Phosphate Rock

Summary. This study investigated whether changing phosphatic fertiliser type affects the accumulation of cadmium (Cd) and fluorine (F) in pasture herbage. North Carolina phosphate rock, and partially acidulated fertilisers derived from this rock, generally have higher Cd and F concentrations compared with single superphosphate currently manufactured in Australia. Clover herbage from sites of the National Reactive Phosphate Rock trial was collected and analysed for concentrations of Cd (11 sites) and F (4 sites). A comparison was made between pastures fertilised with 4 rates of single superphosphate, North Carolina phosphate rock, and partially acidulated phosphate rock having Cd concentrations of 283, 481 and 420 mg/kg P respectively, and F concentrations of 170, 271 and 274 g/kg P respectively. One site used Hamrawein (Egypt) phosphate rock (HRP) having a Cd and F concentration of 78 mg Cd/kg P and 256 g F/kg P respectively. To help identify differences in herbage Cd concentrations between sites, unfertilised soils from each site were analysed for total and extractable Cd contents. At one site Cd concentrations in bulk herbage (clover, grasses and weeds) were related to infestation of the pasture by capeweed (Arctotheca calendula L. Levyns). There were no significant differences between F in herbage from plots fertilised with either single superphosphate, partially acidulated phosphate rock or North Carolina phosphate rock, or between sites. Concentrations of F in herbage were low, generally less than 10 mg/kg. However, there were large differences in Cd concentrations in herbage between sites, while differences between fertiliser treatments were small in comparison. The site differences were only weakly related to total or extractable (0.01 mol CaCl2/L) Cd concentrations in soil. Significant differences in Cd concentrations in clover due to fertiliser type were found at 5 sites. North Carolina phosphate rock treatments had significantly higher Cd concentrations in clover compared with single superphosphate at 2 sites. Partially acidulated phosphate rock treatments had significantly higher Cd concentrations in clover compared with single superphosphate at 4 sites. At the site where Hamrawein was tested, this treatment had significantly lower Cd concentrations in clover compared with both single superphosphate and North Carolina phosphate rock treatments.

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Reactions of Partially Acidulated Phosphate Rock with Soils from the Tropics

Soil Science Society of America Journal ◽

10.2136/sssaj1980.03615995004400030008x ◽

1980 ◽

Vol 44 (3) ◽

pp. 477-482 ◽

Cited By ~ 44

Author(s):

A. Uzo Mokwunye ◽

S. H. Chien

Keyword(s):

Phosphate Rock ◽

Partially Acidulated Phosphate Rock ◽

The Tropics

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Processing aspects of production of partially acidulated phosphate rock fertilisers using phosphoric acid

Fertilizer Research ◽

10.1007/bf01049805 ◽

1987 ◽

Vol 13 (1) ◽

pp. 87-95 ◽

Cited By ~ 5

Author(s):

A. C. Braithwaite

Keyword(s):

Phosphoric Acid ◽

Phosphate Rock ◽

Partially Acidulated Phosphate Rock

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Lettuce Response to Phosphorus Fertilization with Struvite Recovered from Municipal Wastewater

HortScience ◽

10.21273/hortsci.44.2.426 ◽

2009 ◽

Vol 44 (2) ◽

pp. 426-430 ◽

Cited By ~ 40

Author(s):

Ricardo González-Ponce ◽

Esther G. López-de-Sá ◽

César Plaza

Keyword(s):

Phosphate Rock ◽

Municipal Wastewater ◽

P Uptake ◽

Environmental Benefits ◽

Phosphorus Fertilization ◽

Single Superphosphate ◽

Loamy Sand Soil ◽

P Fertilizer ◽

P Rate ◽

Spanish Research

Struvite (MgNH4PO4·6H2O) production is widely studied as a way to remove phosphorus (P) from wastewater and generate a potentially marketable P fertilizer, but its effects on crops have yet to be researched more thoroughly. This study was conducted to evaluate struvite recovered by the Spanish Research Council (CSIC) pilot process (STR) as a source of P for lettuce (Lactuca sativa L.) by comparing its effectiveness with that of single superphosphate (SUP), a common P fertilizer derived from phosphate rock. In a greenhouse pot experiment, a P-deficient loamy sand soil was amended with either SUP or STR at P rates of 0, 4, 8, 12, 16, and 20 mg·kg−1. Nitrogen and potassium were uniformly supplied to all treatments. The response of lettuce head fresh weight and P uptake to P rate exhibited statistically significant quadratic relationships for both SUP and STR. With respect to SUP, STR was significantly more effective in increasing lettuce yield and P uptake, probably because of the larger amount of magnesium (Mg) incorporated with this material and a synergistic effect on P uptake. This work supports previous findings based on other test crops in suggesting that STR can be a P source attractive to the fertilizer market with additional agronomic and environmental benefits such as providing available Mg and nitrogen, helping attenuate consumption of phosphate rock, and reducing release of P by discharge of treated wastewaters to surface and groundwater systems.

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