A rapid fractionation method for assessing key soil phosphorus parameters in agroecosystems

Geoderma ◽  
2021 ◽  
Vol 385 ◽  
pp. 114893
Author(s):  
Luciano C. Gatiboni ◽  
Leo M. Condron
Keyword(s):  
Soil Phosphorus ◽  
Fractionation Method

scholarly journals Fertilizer phosphorus in some Finnish soils

1961 ◽  
Vol 33 (1) ◽  
pp. 131-139 ◽  
Author(s):  
Armi Kaila
Keyword(s):  
Organic Phosphorus ◽  
Soil Phosphorus ◽  
Peat Soil ◽  
Acid Soils ◽  
Ammonium Fluoride ◽  
Field Trials ◽  
Plant Residues ◽  
Available Phosphorus ◽  
Incubation Experiments ◽  
Fractionation Method

In the present paper it is tried to trace the fate of fertilizer phosphorus in soil by comparing the analyses of soils from treated and untreated plots of field trials. This indirect approach cannot be expected to provide exact values, but it is likely to give an approximate answer. The results reported above do not in any marked degree change our present conception of the forms in which fertilizer phosphorus accumulates in soils. In the acid soils studied (pH 4—6.4 in 0.02 N CaCl2) superphosphate tended to increase the fractions which were extracted by NH4F or NaOH. Hyperphosphate phosphorus was mostly found in the acid-soluble fraction. During a longer period of dressing with phosphate an increase in the organic phosphorus content of a peat soil could be detected. In the incubation experiments the mineralization of organic phosphorus occurred at a higher rate in the samples from the plots treated with superphosphate than in those from the untreated one. It might be supposed that the organic phosphorus mineralized mainly originated from the plant residues. It seems that the fractionation method developed by CHANG and JACKSON (4) for the estimation of discrete forms of soil phosphorus is not quite satisfactory for tracing the fertilizer phosphorus in soils recently dressed with phosphates. In particular, it may be fallacious to conclude that the fraction extracted by NH4F would only represent phosphorus bound to aluminium and its compounds. At least in the absence of soil, a large part of phosphorus in dicalcium phosphate dihydrate falls into this fraction, and also a small amount of hyperphosphate phosphorus may be found in it. The test values for »available» phosphorus showed the effect of fertilizers in accordance with previous observations (9, 13). Acetic acid soluble P revealed the treatment with hyperphosphate, but only slightly the application of superphosphate. The test value for the sorbed P of BRAY and KURTZ (2), or phosphorus extracted by 0.03 N NH4F-0.025 N HCI, distinctly indicated the addition of superphosphate, and also to some extent the presence of hyperphosphate phosphorus. Thus, even these results furnish a supplement to the data (11, 19) which prove that acids are not recommendable for the estimation of »available» phosphorus in Finnish soils. Probably, the use of ammonium fluoride would give a more reliable picture, provided, it is on the whole possible to characterize the phosphorus condition of soil with this kind of test values.

Functional Relationship of Polymerization Sites of Vertebrate Fibrinogens

1979 ◽  
Author(s):  
C Cierniewski ◽  
T Krajewski ◽  
E Janiak
Keyword(s):  
Gel Electrophoresis ◽  
Functional Relationship ◽  
Polyacrylamide Gel Electrophoresis ◽  
Polyacrylamide Gel ◽  
Functional Similarity ◽  
Fractionation Method ◽  
Relationship Of ◽  
Fibrin Monomers ◽  
Fibrinogen Molecule ◽  
Cold Ethanol Fractionation

Various studies on the interaction of immobilized mammalian fibrinogen and fibrin monomers with some fibrinogen derivatives demonstrated the presence of two sets of polymerization sites in the mammalian fibrinogen molecule. We obtained the same results while investigating the fibrinogen molecules of other classes of vertebrates /Pisces. Amphibia. Aves/. Despite significant differences among their subunit structures, all of them contain polymerization sites homologous to mammalian counterparts. Moreover, due to great functional similarity, fibrinogen or fibrin monomers of the analyzed species of Pisces. Amphibia. Aves and Mammalia interacted in a specific way with immobilized pig fibrin monomers or fibrinogen, respectively. Using these pig affinity adsorbents, fibrinogen and fibrin monomers of different vertebrates were isolated directly from plasma and analyzed by SDS polyacrylamide gel electrophoresis. Polypeptide compositions of eluted proteins were identical to those obtained for corresponding fibrinogen preparations isolated by cold-ethanol fractionation method. It appears to indicate that the nature of polymerization sites in vertebrate fibrinogens is alike.

Improved Plant Diversity as a Strategy to Increase Available Soil Phosphorus

2019 ◽  
Vol 103 (1) ◽  
pp. 43-45 ◽  
Author(s):  
Carlos Crusciol ◽  
João Rigon ◽  
Juliano Calonego ◽  
Rogério Soratto
Keyword(s):  
Crop Yields ◽  
Soil Phosphorus ◽  
Cropping System ◽  
P Availability ◽  
P Fractions ◽  
Crop Species ◽  
Soil P ◽  
Residue Decomposition ◽  
Available Soil Phosphorus ◽  
Crop Residue Decomposition

Some crop species could be used inside a cropping system as part of a strategy to increase soil P availability due to their capacity to recycle P and shift the equilibrium between soil P fractions to benefit the main crop. The release of P by crop residue decomposition, and mobilization and uptake of otherwise recalcitrant P are important mechanisms capable of increasing P availability and crop yields.

Effect of different fertilization systems on soil phosphorus fertility and crop yield

2009 ◽  
Vol 17 (5) ◽  
pp. 885-889
Author(s):  
Wan-Tai YU ◽  
Zi-Shao JIANG ◽  
Qiang MA ◽  
Hua ZHOU
Keyword(s):  
Crop Yield ◽  
Soil Phosphorus

Decadal Change in Vegetation and Soil Phosphorus Pattern across the Everglades Landscape

2003 ◽  
Vol 32 (1) ◽  
pp. 344 ◽  
Author(s):  
Daniel L. Childers ◽  
Robert F. Doren ◽  
Ronald Jones ◽  
Gregory B. Noe ◽  
Michael Rugge ◽  
...  
Keyword(s):  
Soil Phosphorus ◽  
Decadal Change

Phosphorus Leaching in Relation to Soil Type and Soil Phosphorus Content

2004 ◽  
Vol 33 (2) ◽  
pp. 678 ◽  
Author(s):  
Faruk Djodjic ◽  
Katarina Börling ◽  
Lars Bergström
Keyword(s):  
Soil Type ◽  
Phosphorus Content ◽  
Soil Phosphorus ◽  
Phosphorus Leaching
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