PYROPHOSPHATE AS A SOURCE OF PHOSPHORUS : HYDROLYSIS UNDER DIFFERENT CONDITIONS

Polyphosphates are occasionally added to the soils as a phosphate source for plant nutrition. Polyphosphates (e.g. pyrophosphates) may be more economical due to their smaller volume and low transportation costs. Pyrophosphates (PP) are water-soluble and their condensed nature results in higher P analyses. However, it is observed that PP is a relatively ineffective source of P for plants prior to hydrolysis to the orthophosphate form. Hydrolysis of PP was, therefore, studied under different conditions. Pyrophosphate hydrolysis proceeded very slowly in solution media compared with that in the soil system. Added orthophosphate (OP), calcium carbonate (CaCO3) and organic acids (rice straw extract) increased PP hydrolysis in solution. Hydrolysis of PP was more in soils subjected to submerged incubations as compared to moist incubations. In soil system addition of OP decreased PP hydrolysis both during submerged and moist incubations, whereas addition of organic acids (rice straw extract) along with OP increased PP hydrolysis. Increasing levels of temperature increased PP hydrolysis both in solution media and in soil system (submerged and moist incubations).

[1]  R. Dick,et al.  FACTORS AFFECTING HYDROLYSIS OF POLYPHOSPHATES IN SOILS , 1987 .

[2]  R. Dick,et al.  HYDROLYSIS OF POLYPHOSPHATES IN SOILS , 1986 .

[3]  L. Hossner,et al.  FACTOR INTERACTIONS AND THEIR INFLUENCE ON HYDROLYSIS OF CONDENSED PHOSPHATES IN SOILS1 , 1986 .

[4]  D. Stott,et al.  INHIBITION OF PYROPHOSPHATASE ACTIVITY IN SOILS BY TRACE ELEMENTS1 , 1985 .

[5]  L. Busman,et al.  Hydrolysis of Trimetaphosphate in Soils1 , 1985 .

[6]  L. Busman.  Behavior of polyphosphates in soils , 1984 .

[7]  W. Dick,et al.  Distribution and stability of pyrophosphatase in soils , 1979 .

[8]  W. Lindsay,et al.  Development of a DTPA soil test for zinc, iron, manganese and copper , 1978 .

[9]  W. Dick,et al.  Inorganic pyrophosphatase activity of soils , 1978 .

[10]  J. D. Hughes,et al.  Effects of microbial population and culture phosphate composition on the activity of pyrophosphatases from soil microorganisms , 1977 .

[11]  W. H. Patrick,et al.  Growth and Mineral Composition of Rice at Various Soil Moisture Tensions and Oxygen Levels , 1976 .

[12]  J. J. Jurinak,et al.  Kinetics of the Phosphate Interaction with Calcite 1 , 1974 .

[13]  N. Savant,et al.  Pyrophosphate Hydrolysis in Soil as Influenced by Flooding and Fixation 1 , 1972 .

[14]  J. D. Hughes,et al.  Triammonium Pyrophosphate as a Source of Phosphorus for Plants1 , 1971 .

[15]  L. Hossner,et al.  Pyrophosphate Hydrolysis in Flooded Soil , 1971 .

[16]  R. W. Blanchar,et al.  Hydrolysis and Sorption Reactions of Orthophosphate, Pyrophosphate, Tripolyphosphate, and Trimetaphosphate Anions Added to an Elliot Soil1 , 1969 .

[17]  S. Larsen,et al.  PYROPHOSPHATE AS A SOURCE OF PHOSPHORUS FOR PLANTS , 1964 .

[18]  R. Healy,et al.  A Kinetic Study of the Hydrolysis of Trimetaphosphates1,2 , 1955 .

[19]  J. R. Wazer,et al.  Structure and Properties of the Condensed Phosphates. VII. Hydrolytic Degradation of Pyro- and Tripolyphosphate , 1955 .