Microbiological processes in soil organic phosphorus transformations in conventional and biological cropping systems

1996 ◽  
Vol 21 (3) ◽  
pp. 138-148
Author(s):  
A. Oberson ◽  
J. M. Besson ◽  
N. Maire ◽  
H. Sticher
Keyword(s):  
Organic Phosphorus ◽  
Cropping Systems ◽  
Microbiological Processes ◽  
Soil Organic Phosphorus

INOSITOL PHOSPHATE AND ORGANIC PHOSPHORUS CONTENTS AND PHOSPHATASE ACTIVITY OF SOME CANADIAN AND GHANAIAN SOILS

1982 ◽  
Vol 62 (1) ◽  
pp. 31-38 ◽  
Author(s):  
M. R. APPIAH ◽  
R. L. THOMAS
Keyword(s):  
Phosphatase Activity ◽  
Phosphorus Content ◽  
Inositol Phosphates ◽  
Inositol Phosphate ◽  
Organic Phosphorus ◽  
Cropping Systems ◽  
Fertilizer Application ◽  
Continuous Corn ◽  
Soil Organic Phosphorus ◽  
Low Activity

Total organic phosphorus, inositol phosphates and phosphatase activity of some selected Canadian and Ghanaian soils were compared. The lower organic phosphorus content of Ghanaian soils compared to the Canadian soils may be the result of either the faster rate of mineralization of organic phosphorus in the tropical Ghanaian soils or differences in the nature of organic residues returned to the soils. Wide variations in the amounts of inositol phosphate were observed in both groups of soils. The low activity of phosphatases in the Ghanaian soils may be due to the lower content of organic matter, a lower microbial biomass and consequently a lower phosphatase production. The effect of rotation and fertilizer application on the total organic P, inositol P and phosphatase activity indicated that alfalfa grown in rotation with corn and oats contributed significantly to the total soil organic phosphorus content with no apparent increase in inositol phosphate content. No consistent trends were observed in either the total amount of inositol phosphates or the proportion of the total phosphorus that existed as inositol phosphates for either the fertilized or unfertilized soils. The activity of phosphatase was generally higher in the corn-oat-alfalfa rotation than in the systems of corn-oat and continuous corn. Fertilization decreased the phosphatase activity in all cropping systems.

MINERALIZATION OF SOIL ORGANIC PHOSPHORUS WITH PARTICULAR REFERENCE TO THE EFFECT OF LIME

1963 ◽  
Vol 43 (1) ◽  
pp. 97-106 ◽  
Author(s):  
R. L. Halstead ◽  
J. M. Lapensee ◽  
K. C. Ivarson
Keyword(s):  
Phosphorus Content ◽  
Organic Phosphorus ◽  
Acid Soils ◽  
Inorganic Phosphorus ◽  
Eastern Canada ◽  
Surface Samples ◽  
Soil Organic Phosphorus ◽  
Repressive Effect ◽  
Partial Sterilization ◽  
Positive Effect

In a laboratory experiment, liming resulted in an average decline of 3.6 per cent in the total organic phosphorus content of incubated surface samples of seven acid soils from eastern Canada. Increases of 2.6 and 5.1 per cent in 1N H2SO4- and 4N HCl-soluble inorganic phosphorus, respectively, and a decrease of 46.4 per cent in NaHCO3-soluble organic phosphorus (pH 8.5) provided further evidence of mineralization of organic phosphorus following liming. There was some evidence, however, that the differences in NaHCO3-soluble organic phosphorus following liming were due only in part to mineralization, since Ca(OH)2 added to a soil just prior to extraction with NaHCO3 had a repressive effect on the solubility of the organic phosphorus compounds.Some mineralization of organic phosphorus occurred when unlimed samples were incubated in the laboratory for 9 months.Marked increases in microbiological activity, as indicated by increased numbers of microorganisms, and increased CO2 and NO3-nitrogen production, were associated with lower values for extractable organic phosphorus following liming. Partial sterilization of samples with toluene lowered biological activity in the unlimed and limed samples. Toluene was found, however, to have a positive effect on release of phosphorus from organic form.

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