Phosphate rocks and partially-acidulated phosphate rocks as controlled release P fertilizers

1993 ◽  
Vol 35 (1-2) ◽  
pp. 25-31 ◽  
Author(s):  
J. Hagin ◽  
R. Harrison
Keyword(s):  
Controlled Release ◽  
Phosphate Rocks ◽  
Partially Acidulated Phosphate Rocks ◽  
P Fertilizers

Partially acidulated phosphate rocks: Controlled release phosphorus fertilizers for more sustainable agriculture

1994 ◽  
Vol 37 (1) ◽  
pp. 69-78 ◽  
Author(s):  
S. S. S. Rajan ◽  
M. B. O'Connor ◽  
A. G. Sinclair
Keyword(s):  
Controlled Release ◽  
Sustainable Agriculture ◽  
Phosphate Rocks ◽  
Partially Acidulated Phosphate Rocks ◽  
Phosphorus Fertilizers

Use of partially acidulated phosphate rocks as phosphate fertilizers

1993 ◽  
Vol 35 (1-2) ◽  
pp. 47-59 ◽  
Author(s):  
S. S. S. Rajan ◽  
B. C. Marwaha
Keyword(s):  
Phosphate Rocks ◽  
Phosphate Fertilizers ◽  
Partially Acidulated Phosphate Rocks

Partially acidulated phosphate rocks: Phosphorus release characteristics

1990 ◽  
Vol 22 (2) ◽  
pp. 109-117 ◽  
Author(s):  
J. Hagin ◽  
S. S. S. Rajan ◽  
M. K. Boyes ◽  
M. Upsdell
Keyword(s):  
Phosphorus Release ◽  
Phosphate Rocks ◽  
Partially Acidulated Phosphate Rocks

Phosphorus supplying capacity of phosphate rocks as influenced by compaction with water-soluble P fertilizers

2004 ◽  
Vol 68 (1) ◽  
pp. 73-84 ◽  
Author(s):  
Mamata Begum ◽  
G. Narayanasamy ◽  
D.R. Biswas
Keyword(s):  
Water Soluble ◽  
Phosphate Rocks ◽  
Water Soluble P ◽  
Soluble P ◽  
P Fertilizers

scholarly journals Leaching Characteristics of P From Four Fertilizer Sources in a Container Nursery Growing Medium

HortScience ◽  
1995 ◽  
Vol 30 (4) ◽  
pp. 794D-794
Author(s):  
Janet C. Cole ◽  
John M. Dole
Keyword(s):  
Controlled Release ◽  
Ammonium Phosphate ◽  
Cost Effective ◽  
Deionized Water ◽  
Pine Bark ◽  
Phosphorus Leaching ◽  
Triple Superphosphate ◽  
Growing Medium ◽  
Leaching Characteristics ◽  
P Fertilizers

A 3 pine bark: 1 peatmoss: 1 sand (by volume) medium was amended with 7.7 g P as superphosphate, triple superphosphate, ammonium phosphate, or controlled-release ammonium phosphate per 1000 g medium (3.8 liters). The medium was then leached with 250, 350, or 450 ml distilled, deionized water daily for 25 days. Phosphorus leaching curves were then generated for each fertilizer. A subsequent study determined the effect of these four P fertilizers on growth of marigold seedlings in the greenhouse. Superphosphate, triple superphosphate, and ammonium phosphate rapidly leached from the medium, while the controlled-release ammonium phosphate was retained for a longer time. Marigold growth was not affected by fertilizer type; however, marigolds grown in P-amended media were larger than those grown without P. These studies indicate that amending container growing medium with superphosphate or triple superphosphate prior to planting may not be cost-effective.

Comparison of Bray I and Pi tests for evaluating plant-available phosphorus from soils treated with different partially acidulated phosphate rocks

1989 ◽  
Vol 114 (2) ◽  
pp. 211-216 ◽  
Author(s):  
R. G. Menon ◽  
S. H. Chien ◽  
L. L. Hammond
Keyword(s):  
Available Phosphorus ◽  
Phosphate Rocks ◽  
Partially Acidulated Phosphate Rocks

Partially acidulated phosphate rocks made from phosphoric acid using direct acidulation-granulation techniques

1987 ◽  
Vol 12 (1) ◽  
pp. 85-98 ◽  
Author(s):  
A. C. Braithwaite ◽  
D. A. Rogers
Keyword(s):  
Phosphoric Acid ◽  
Phosphate Rocks ◽  
Partially Acidulated Phosphate Rocks

scholarly journals Obtaining the partially acidulated phosphate rocks by means of intermediate-grade phosphate and diluted phosphoric acid: Influence of some parameters

2016 ◽  
Vol 18 (3) ◽  
pp. 39-43
Author(s):  
Abbes Mizane ◽  
Ahmed Boumerah ◽  
Noureddine Dadda ◽  
Rabah Rehamnia ◽  
Salah Belhait
Keyword(s):  
Phosphoric Acid ◽  
Reaction Times ◽  
Water Soluble ◽  
Particle Sizes ◽  
Phosphate Rocks ◽  
Partially Acidulated Phosphate Rocks ◽  
Water Soluble P ◽  
Conversion Rates ◽  
Soluble P ◽  
Phosphoric Acid Concentration

Abstract In this work, some parameters during the partial acidulation by phosphoric acid of phosphate 53.75% BPL (bone phosphate of lime) having different particle sizes are determined. P2O5 recovery is obtained by performing a series of reactions using phosphoric acid diluted from 10 to 40 wt.% and with reaction times ranging from 10 to 50 minutes. The best conversion rates are obtained with the following reaction parameters: phosphates size: 88-177 μm, reaction time: 50 minutes and phosphoric acid concentration: 40 wt.%. In the second part, the water-soluble P2O5 of PAPRs (Partially Acidulated Phosphate Rocks) obtained with phosphoric acid 30% and 40 wt.% is measured. The results of experiments showed that the water-soluble P2O5 has reached 15.2% for PAPRs obtained by reacting phosphate 88 μm with phosphoric acid 40 wt%.

scholarly journals Phosphorus Source Affects Phosphorus Leaching and Growth of Containerized Spirea

HortScience ◽  
2000 ◽  
Vol 35 (7) ◽  
pp. 1249-1252 ◽  
Author(s):  
Arleen Godoy ◽  
Janet C. Cole
Keyword(s):  
Controlled Release ◽  
Plant Growth ◽  
Phosphorus Leaching ◽  
Triple Superphosphate ◽  
Controlled Release Fertilizer ◽  
P Concentration ◽  
R Ratio ◽  
Phosphorus Source ◽  
P Leaching ◽  
P Fertilizers

Commercially propagated `Halward's Silver' spirea (Spiraea nipponica Maxim.) bareroot cuttings and cuttings with substrate around the roots (plugs) were transplanted into 3.8-L containers and fertilized with various P fertilizers to determine the effect of fertilizer source on P leaching and plant growth. The following fertilizer treatments were applied: 1) 100% of the recommended rate of P from controlled-release fertilizer (CRF), consisting of 22N-2.6P-10K; 2) 100% of P from triple superphosphate (TSP, 0N-20P-0K) with N and K provided by 22N-0P-10K CRF; and 3) 50% of P from CRF, consisting of 22N-1.3P-10K, plus 50% of P from TSP (CRF/TSP). The most P leached from cuttings transplanted as plugs or bareroot and fertilized with TSP, while the least P leached from cuttings transplanted as plugs and fertilized with CRF or CRF/TSP. Plants fertilized with CRF/TSP generally had larger root dry weights than did plants fertilized with CRF or TSP. Plants fertilized with CRF had the smallest stem dry weights. Shoot-to-root (S/R) ratio was largest in plants transplanted as plugs in substrate amended with TSP, but cuttings transplanted bareroot into CRF-amended substrate had the highest S/R ratio and the lowest stem P concentration. Incorporation of CRF/TSP into the container substrate can reduce P leaching compared with incorporation of TSP, and can increase root and stem dry weights of plants transplanted as plugs compared with incorporation of CRF.

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