Greenhouse evaluation of phosphorus availability from compacted phosphate rocks with urea or with urea and triple superphosphate

1987 ◽  
Vol 14 (3) ◽  
pp. 245-256 ◽  
Author(s):  
S. H. Chien ◽  
D. Sompongse ◽  
J. Henao ◽  
D. T. Hellums
Keyword(s):  
Phosphorus Availability ◽  
Triple Superphosphate ◽  
Phosphate Rocks ◽  
Greenhouse Evaluation

Characterization and Greenhouse Evaluation of Brazilian Calcined Nonapatite Phosphate Rocks for Rice

2008 ◽  
Vol 100 (3) ◽  
pp. AGJ2AGRONJ20070209 ◽  
Author(s):  
E. A. B. Francisco ◽  
S. H. Chien ◽  
L. I. Prochnow ◽  
E. R. Austin ◽  
M. C. M. Toledo ◽  
...  
Keyword(s):  
Phosphate Rocks ◽  
Greenhouse Evaluation

Phosphorus Availability, Effect of Flooding on Plant Availability of Phosphorus from Various Phosphate Rocks

1958 ◽  
Vol 6 (6) ◽  
pp. 453-455 ◽  
Author(s):  
R. E. Shapiro ◽  
W. H. Armiger
Keyword(s):  
Phosphorus Availability ◽  
Phosphate Rocks ◽  
Plant Availability

scholarly journals Degree of Phosphorus Saturation and Soil Phosphorus Thresholds in an Ultisol Amended with Triple Superphosphate and Phosphate Rocks

2011 ◽  
Vol 11 ◽  
pp. 1421-1441 ◽  
Author(s):  
E. W. Gikonyo ◽  
A. R. Zaharah ◽  
M. M. Hanafi ◽  
A. R. Anuar
Keyword(s):  
Soil Phosphorus ◽  
Ammonium Oxalate ◽  
Paper Strip ◽  
Threshold Values ◽  
Triple Superphosphate ◽  
Phosphate Rocks ◽  
Exponential Functions ◽  
P Release ◽  
P Rate ◽  
Total P

Soil phosphorus (P) release capability could be assessed through the degree of P saturation (DPS). Our main objective was to determine DPS and, hence, P threshold DPS values of an Ultisol treated with triple superphosphate (TSP), Gafsa phosphate rocks (GPR), or Christmas Island phosphate rocks (CIPR), plus or minus manure. P release was determined by the iron oxide—impregnated paper strip (strip P), while DPS was determined from ammonium oxalate—extractable aluminum (Al), iron (Fe), and P. Soils were sampled from a closed incubation study involving soils treated with TSP, GPR, and CIPR at 0–400 mg P kg-1, and a field study where soils were fertilized with the same P sources at 100–300 kg P ha-1plus or minus manure. The DPS was significantly influenced by P source x P rate, P source x manure (incubated soils), and by P source x P rate x time (field-sampled soils). Incubated soil results indicated that both initial P and total strip P were related to DPS by exponential functions: initial strip P = 1.38exp0.18DPS, R2= 0.82** and total strip P = 8.01exp0.13DPS, R2 = 0.65**. Initial strip P was linearly related to total P; total P = 2.45, initial P + 8.41, R2= 0.85**. The threshold DPS value established was about 22% (incubated soil). Field soils had lower DPS values <12% and strip P was related to initial DPS and average DPS in exponential functions: strip P = 2.6exp0.44DPS, R2= 0.77** and strip P = 1.1DPS2— 2.4DPS + 6.2, R2= 0.58**, respectively. The threshold values were both at ≈8% and P release was 11–14 mg P kg-1. Results are evident that DPS can be used to predict P release, but the threshold values are environmentally sensitive; hence, recommendations should be based on field trials.

National Reactive Phosphate Rock Project —aims, experimental approach and site characteristics

1997 ◽  
Vol 37 (8) ◽  
pp. 885 ◽  
Author(s):  
M. J. McLaughlin ◽  
N. K. Fleming ◽  
P. G. Simpson ◽  
M. D. A. Bolland ◽  
R. J. Gilkes ◽  
...  
Keyword(s):  
North Carolina ◽  
Formic Acid ◽  
Phosphate Rock ◽  
Soil Phosphorus ◽  
Triple Superphosphate ◽  
Phosphate Rocks ◽  
Agronomic Effectiveness ◽  
North Carolina Phosphate Rock ◽  
Reactive Phosphate ◽  
Reactive Phosphate Rock

Summary. Field-based cutting trials, which formed part of the National Reactive Phosphate Rock Project, were established across Australia in a range of environments to evaluate the agronomic effectiveness of 5 phosphate rocks, and 1 partially acidulated phosphate rock, relative to either single superphosphate or triple superphosphate. The phosphate rocks differed in reactivity. Sechura (Bayovar) and North Carolina phosphate rocks were highly reactive (>70% solubility in 2% formic acid), whilst Khouribja (Moroccan) and Hamrawein (Egypt) phosphate rock were moderately reactive. Duchess phosphate rock from Queensland was relatively unreactive (<45% solubility in 2% formic acid). Phosphate rock effectiveness was assessed by measuring pasture production over a range of phosphorus levels, and by monitoring bicarbonate-soluble phosphorus extracted from soil samples collected before the start of each growing season. Other treatments included single large applications of triple superphosphate, partially acidulated phosphate rock and North Carolina phosphate rock applied at 2 rates, and the application of monocalcium phosphate and North Carolina phosphate rock sources without sulfur to evaluate the importance of sulfur in the potential use of phosphate rock fertilisers at each site. A broad range of environments were represented over the 30 sites which were based on pastures using annual and/or perennial legumes and perennial grasses. Rainfall across the network of sites ranged from 560 to 4320 mm, soil pH (CaCl2) from 4.0 to 5.1, and Colwell-extractable phosphorus ranged from 3 to 47 µg/g before fertiliser application. Two core experiments were established at each site. The first measured the effects of phosphate rock reactivity on agronomic effectiveness, while the second measured the effects of the degree of water solubility of the phosphorus source on agronomic effectiveness. The National Reactive Phosphate Rock Project trials gave the opportunity to confirm the suitability of accepted procedures to model fertiliser response and to develop new approaches for comparing different fertiliser responses. The Project also provided the framework for subsidiary studies such as the effect of fertiliser source on soil phosphorus extractability, cadmium and fluorine concentrations in herbage, evaluation of soil phosphorus tests, and the influence of particle size on phosphate rock effectiveness. The National Reactive Phosphate Rock Project presents a valuable model for a large, Australia-wide, collaborative team approach to an important agricultural issue. The use of standard and consistent experimental methodologies at every site ensured that maximum benefit was obtained from data generated. The aims, rationale and methods used for the experiments across the network are presented and discussed.

Phosphorus availability from partial acidulation of two phosphate rocks

1980 ◽  
Vol 1 (1) ◽  
pp. 37-49 ◽  
Author(s):  
L. L. Hammond ◽  
S. H. Chien ◽  
J. R. Polo
Keyword(s):  
Phosphorus Availability ◽  
Phosphate Rocks ◽  
Partial Acidulation

scholarly journals Amending triple superphosphate with chicken litter biochar improves phosphorus availability

2018 ◽  
Vol 7 (2) ◽  
pp. 121-132
Author(s):  
Audrey Asap ◽  
Ahmed Osumanu Haruna ◽  
Nik Muhamad Ab. Majid ◽  
Maru Ali
Keyword(s):  
Phosphorus Availability ◽  
Triple Superphosphate ◽  
Chicken Litter

scholarly journals Biofertilizers and performance of Paenibacillus in the absorption of macronutrients by cowpea bean and soil fertility

2015 ◽  
Vol 19 (12) ◽  
pp. 1136-1142 ◽  
Author(s):  
Valéria N. da Silva ◽  
Luiz E. de S. F. da Silva ◽  
Apolino J. N. da Silva ◽  
Gorete R. de Macedo
Keyword(s):  
Agricultural Research ◽  
Chemical Properties ◽  
Potassium Phosphate ◽  
Rio Grande ◽  
Paenibacillus Polymyxa ◽  
Triple Superphosphate ◽  
Phosphate Rocks ◽  
Research Corporation ◽  
And Performance ◽  
Bean Crop

ABSTRACT The study was conducted in a greenhouse at the Agricultural Research Corporation of Rio Grande do Norte (EMPARN), in order to evaluate the effect of biofertilizers and potassium phosphate rocks, triple superphosphate (TSP) and potassium chloride (KCl), crushed rocks on the chemical properties of the soil and performance of the bacteria Paenibacillus polymyxa in the absorption of macronutrients by the cowpea bean crop. An Ultisol (10 kg per pot) was used with the addition of biofertilizers at levels 40, 70, 100 and 200% of recommendation for TSP and KCl, inoculated or not with bacteria. There was an effect of fertilization on the absorption of macronutrients, being the best results for P and K with TSP + KCL, and N, Ca and Mg for the biofertilizers. In the chemical properties of the soil, the pH was lower in biofertilizers of higher levels, but it was better especially with its addition to P (BPK200). For Ca it was better with TSP + KCl, and Mg with pure rock. The P. polymyxa did not influence in absorption of elements by the plant. The biofertilizers and rocks could satisfy the nutrient needs of the plants by making them potential for sustainable agriculture.

Effects of organic-acid treatment of phosphate rocks on the phosphorus availability to Italian ryegrass

1997 ◽  
Vol 43 (sup1) ◽  
pp. 1067-1072 ◽  
Author(s):  
Charles I. Sagoe ◽  
T. Ando ◽  
K. Kouno ◽  
T. Nagaoka
Keyword(s):  
Organic Acid ◽  
Acid Treatment ◽  
Phosphorus Availability ◽  
Italian Ryegrass ◽  
Phosphate Rocks
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