41 research outputs found
Sorption of organic phosphorus compounds in Atlantic Coastal Plain soils
Organic phosphorus (P) can comprise a significant amount of the total
P in animal wastes, yet there is little information on the potential for
organic P to be transferred from soils to watercourses. We examined the
adsorption of organic P compounds to soils typical of the southeastern
United States, i.e., Blanton Sand (loamy, siliceous, thermic, Grossarenic
Paleudult), Cecil sandy clay loam (fine, kaolinitic, thermic, Typic Kanhapludult),
and a Belhaven sandy loam (loamy, mixed, dysic, thermic,
Terric Medisaprist). The behavior of four organic P compounds was
studied: adenosine 5'-triphosphate (ATP), adenosine 5'-diphosphate
(ADP), adenosine 5'-monophosphate (AMP), and inositol hexaphosphate
(IHP); while KH2PO4 (ortho-P) was used as an inorganic reference. Laboratory
studies were conducted to determine the effects of concentration
(0-130 p.g P mL-1 ), pH (4.6-7.6), and soil properties on P adsorption. All
the organic P compounds had greater adsorption than KH 2PO4 on the
Blanton and Cecil soils at all concentrations and ranges of pH. In the Belhaven
soil, IHP had the greatest sorption followed by KH 2PO4 and the
nucleotides (ATP, ADP, and AMP, respectively). Adsorption of organic
P was positively correlated with soil organic matter and Fe and Al contents.
The greater sorption of some organic P compounds over that of
ortho-P suggests that these compounds may pose less of a threat to water
quality, although this preferential sorption may increase soluble P in
situations where there is displacement of ortho-P by organic P added in
manures
Abiotic features of a river from the Upper TietĂŞ River Basin (SP, Brazil) along an environmental gradient
Sorption of organic phosphorus compounds in Atlantic Coastal Plain soils
Organic phosphorus (P) can comprise a significant amount of the total
P in animal wastes, yet there is little information on the potential for
organic P to be transferred from soils to watercourses. We examined the
adsorption of organic P compounds to soils typical of the southeastern
United States, i.e., Blanton Sand (loamy, siliceous, thermic, Grossarenic
Paleudult), Cecil sandy clay loam (fine, kaolinitic, thermic, Typic Kanhapludult),
and a Belhaven sandy loam (loamy, mixed, dysic, thermic,
Terric Medisaprist). The behavior of four organic P compounds was
studied: adenosine 5'-triphosphate (ATP), adenosine 5'-diphosphate
(ADP), adenosine 5'-monophosphate (AMP), and inositol hexaphosphate
(IHP); while KH2PO4 (ortho-P) was used as an inorganic reference. Laboratory
studies were conducted to determine the effects of concentration
(0-130 p.g P mL-1 ), pH (4.6-7.6), and soil properties on P adsorption. All
the organic P compounds had greater adsorption than KH 2PO4 on the
Blanton and Cecil soils at all concentrations and ranges of pH. In the Belhaven
soil, IHP had the greatest sorption followed by KH 2PO4 and the
nucleotides (ATP, ADP, and AMP, respectively). Adsorption of organic
P was positively correlated with soil organic matter and Fe and Al contents.
The greater sorption of some organic P compounds over that of
ortho-P suggests that these compounds may pose less of a threat to water
quality, although this preferential sorption may increase soluble P in
situations where there is displacement of ortho-P by organic P added in
manures