The Chemistry and Agronomic Effectiveness of Phosphate Fertilizers

1998 ◽  
Vol 1 (2) ◽  
pp. 139-163 ◽  
Author(s):  
Mike D. A. Bolland ◽  
Robert J. Gilkes
Keyword(s):  
Phosphate Fertilizers ◽  
Agronomic Effectiveness

scholarly journals Effectiveness of phosphate fertilizers of diffrent water solubilities in relation to soil phophorus adsorption

2006 ◽  
Vol 63 (4) ◽  
pp. 333-340 ◽  
Author(s):  
Luís Ignácio Prochnow ◽  
Jack Fernando Santos Quispe ◽  
Eros Artur Bohac Francisco ◽  
Graziela Braga
Keyword(s):  
Water Solubility ◽  
P Uptake ◽  
Low Grade ◽  
Phosphate Fertilizers ◽  
Agronomic Effectiveness ◽  
Single Superphosphate ◽  
Greenhouse Study ◽  
Relative Agronomic Effectiveness ◽  
Alternative Sources ◽  
P Sources

Phosphate fertilizers should match soil attributes to enhance agronomic effectiveness and recovery by plants. The purpose of this study was to test the agronomic effectiveness of P sources varying in water solubility on two soils differing widely in P adsorption capacity (PAC). Soils selected for the study were Oxisols with very low available P and presenting low and high PAC (Ox-LPAC and Ox-HPAC, respectively). Both were limed to pH 5.4 in a greenhouse study conducted utilizing corn as the test crop. Treatments consisted of the two soils interacting with five P sources (monocalcium phosphate - MCP, low-grade single superphosphate - LG-SSP, multimagnesium phosphate - MMP, Arad phosphate rock - PR and a P impurity in triple superphosphate - H14), and four rates of P (12.5, 25.0, 50.0 and 100.0 mg kg-1). A control with no P was added for each soil. The treatments were arranged as blocks with three replicates. Plants were harvested 45 d after germination. Dry-matter yield and P uptake were measured and the relative agronomic effectiveness (RAE) compared with MCP as the standard. When applied in low rates of P (12.5 and 25.0 mg kg-1) the RAE of the alternative sources was higher in the soil with high PAC (45, 66, 39 and 65% in the Ox-HPAC for the LG-SSP, MMP, PR and H14, respectively, as opposed to 24, 40, 14 and 47% in the Ox-LPAC). Results suggest that sources of P with low water solubility can be agronomically more effective in soils with high PAC.

scholarly journals Symbiotic Rhizobacteria for Improving of the Agronomic Effectiveness of Phosphate Fertilizers

2016 ◽  
Vol 138 ◽  
pp. 325-331 ◽  
Author(s):  
K. Oufdou ◽  
N. Bechtaoui ◽  
A. El Alaoui ◽  
L. Benidire ◽  
K. Daoui ◽  
...  
Keyword(s):  
Phosphate Fertilizers ◽  
Agronomic Effectiveness

The Efficiency of Certain Ammoniated Superphosphates and Other Phosphate Fertilizers 1

1934 ◽  
Vol 26 (7) ◽  
pp. 591-599
Author(s):  
F. B. Smith ◽  
P. E. Brown ◽  
H. T. Miller ◽  
C. C. Mensing
Keyword(s):  
Phosphate Fertilizers

Development and Testing of Improved Efficiency Boron-Enriched Diammonium Phosphate Fertilizers

2021 ◽  
Author(s):  
Tayyaba Samreen ◽  
Fien Degryse ◽  
Roslyn Baird ◽  
Rodrigo Coqui da Silva ◽  
Zahir Ahmad Zahir ◽  
...  
Keyword(s):  
Diammonium Phosphate ◽  
Phosphate Fertilizers

EFFECT OF PHOSPHATE FERTILIZERS ON ZINC NUTRITION OF FIELD BEANS

Soil Science ◽  
1954 ◽  
Vol 78 (1) ◽  
pp. 1-8 ◽  
Author(s):  
LOUIS C. BOAWN ◽  
FRANK G. VIETS ◽  
CARL L. CRAWFORD
Keyword(s):  
Phosphate Fertilizers ◽  
Zinc Nutrition ◽  
Field Beans

The agronomic effectiveness of reactive phosphate rocks 1. Effect of the pasture environment

1997 ◽  
Vol 37 (8) ◽  
pp. 921 ◽  
Author(s):  
P. W. G Sale ◽  
R. J. Gilkes ◽  
M. D. A. Bolland ◽  
P. G. Simpson ◽  
D. C. Lewis ◽  
...  
Keyword(s):  
North Carolina ◽  
Phosphate Rock ◽  
Surface Soil ◽  
Annual Rainfall ◽  
Triple Superphosphate ◽  
Agronomic Effectiveness ◽  
P Sorption ◽  
Reactive Phosphate ◽  
Reactive Phosphate Rock ◽  
Very High

Summary. The agronomic effectiveness of directly applied North Carolina reactive phosphate rock was determined for 4 years from annual dry matter responses at 26 permanent pasture sites across Australia as part of the National Reactive Phosphate Rock Project. Fertiliser comparisons were based on the substitution value of North Carolina reactive phosphate rock for triple superphosphate (the SV50). The SV50 was calculated from fitted response curves for both fertilisers at the 50% of maximum yield response level of triple superphosphate. The reactive phosphate rock was judged to be as effective as triple superphosphate in the 1st year (and every year thereafter) at 4 sites (SV50 >0.9), and was as effective by the 4th year at 5 sites. At another 9 sites the reactive phosphate rock was only moderately effective with SV50 values between 0.5 and 0.8 in the 4th year, and at the final 8 sites it performed poorly with the 4th year SV50 being less than 0.5. Pasture environments where the reactive phosphate rock was effective in the 1st year were: (i) those on sandy, humic or peaty podsols with an annual rainfall in excess of 850 mm; (ii) those on soils that experienced prolonged winter inundation and lateral surface flow; and (iii) tropical grass pastures in very high rainfall areas (>2300 mm) on the wet tropical coast on North Queensland. The highly reactive North Carolina phosphate rock became effective by the 4th year at sites in southern Australia where annual rainfall exceeded 700 mm, and where the surface soil was acidic [pH (CaCl2) <5.0] and not excessively sandy (sand fraction in the A1 horizon <67%) but had some phosphorus (P) sorption capacity. Sites that were unsuitable for reactive phosphate rock use in the medium term (up to 4 years at least) were on very high P-sorbing krasnozem soils or high P-sorbing lateritic or red earth soils supporting subterranean-clover-dominant pasture, or on lower rainfall (< 600 mm) pastures growing on soils with a sandy A1 horizon (sand component >84%). No single environmental feature adequately predicted reactive phosphate rock performance although the surface pH of the soil was most closely correlated with the year-4 SV50 (r = 0.67). Multiple linear regression analysis found that available soil P (0–10 cm) and the P sorption class of the surface soil (0–2 cm), together with annual rainfall and a measure of the surface soil"s ability to retain moisture, could explain about two-thirds of the variance in the year-4 SV50 . The results from this Project indicate that there are a number of specific pasture environments in the higher rainfall regions of Australia where North Carolina reactive phosphate rock can be considered as an effective substitute P fertiliser for improved pasture.

Preparation of Radioactive Phosphate Fertilizers.

1949 ◽  
Vol 41 (7) ◽  
pp. 1328-1334 ◽  
Author(s):  
W. L. Hill ◽  
E. J. Fox ◽  
J. F. Mullins
Keyword(s):  
Phosphate Fertilizers
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