Author: Otavio Antonio De Camargo
Publisher:
ISBN:
Category :
Languages : en
Pages : 268
Book Description
Sorption and Movement of Inorganic Phosphorus in Alfisol
Author: Otavio Antonio De Camargo
Publisher:
ISBN:
Category :
Languages : en
Pages : 268
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 268
Book Description
Phosphorus Characterization in Sri Lankan Alfisols
Author: Robert R. Sattell
Publisher:
ISBN:
Category : Alfisols
Languages : en
Pages : 150
Book Description
Twelve Sri Lankan Alfisols were characterized for P. Soils were incubated for three weeks with sufficient P applied (P2) to elevate soil solution P to 0.2 ug P/g solution as determined by sorption curves, with 75 percent of P2 (P1), and without P (P0). For PO treatments, (a) organic P, (b) 0.5 M NaHCO3 extractable "labile" inorganic P, (c) 0.1 M NaOH extractable "moderately labile" inorganic P, and (d) concentrated HC1 extractable residual P fractions contained 44, 10, 13, and 22 % of total P respectively. Fifty five percent of applied P (P1 and P2) was recovered in the inorganic 0.5 M NaHCO3 fraction and 25 percent in the inorganic 0.1 M NaOH fraction. Significant amounts of applied P were recovered in the organic fractions of some soils. Factor analysis of PO treatment fractionation data suggested that inorganic and organic fractions were separate equilibrium systems. Both inorganic and organic systems, however, contributed significantly to P uptake in a Neubauer experiment. Moreover, applied fertilizer P appeared to increase contributions of organic P to P uptake. Correlation of Neubauer plant uptake data to Olsen, Bray 1, Bray 2, CAL, and Double acid extractable soil P showed that P uptake was most highly correlated to Double acid extractable P. Regression analysis suggested that the higher correlation was due to the Double acid extractant's ability to measure the organic P contribution to P uptake. Phosphorus sorption by the soils ranged from low to medium and was described satisfactorily by either the Langmuir two surface or the Freundlich equation but not by the Langmuir one surface equation. Correlation analysis indicated that oxalate extractable Fe was the soil component most active in P sorption. Although organic matter and pH were correlated to sorption capacity and may have been directly involved in the P sorption mechanisms they could also have covaried with other components responsible for sorption. Although citrate-dithionite extractable Fe did not appear to be involved in P sorption its high correlation with residual P fractions suggests an involvement with "slow" sorption. Phosphorous sorption had no apparent influence on P uptake by foxtail millet from the 12 soils in a Neubauer experiment.
Publisher:
ISBN:
Category : Alfisols
Languages : en
Pages : 150
Book Description
Twelve Sri Lankan Alfisols were characterized for P. Soils were incubated for three weeks with sufficient P applied (P2) to elevate soil solution P to 0.2 ug P/g solution as determined by sorption curves, with 75 percent of P2 (P1), and without P (P0). For PO treatments, (a) organic P, (b) 0.5 M NaHCO3 extractable "labile" inorganic P, (c) 0.1 M NaOH extractable "moderately labile" inorganic P, and (d) concentrated HC1 extractable residual P fractions contained 44, 10, 13, and 22 % of total P respectively. Fifty five percent of applied P (P1 and P2) was recovered in the inorganic 0.5 M NaHCO3 fraction and 25 percent in the inorganic 0.1 M NaOH fraction. Significant amounts of applied P were recovered in the organic fractions of some soils. Factor analysis of PO treatment fractionation data suggested that inorganic and organic fractions were separate equilibrium systems. Both inorganic and organic systems, however, contributed significantly to P uptake in a Neubauer experiment. Moreover, applied fertilizer P appeared to increase contributions of organic P to P uptake. Correlation of Neubauer plant uptake data to Olsen, Bray 1, Bray 2, CAL, and Double acid extractable soil P showed that P uptake was most highly correlated to Double acid extractable P. Regression analysis suggested that the higher correlation was due to the Double acid extractant's ability to measure the organic P contribution to P uptake. Phosphorus sorption by the soils ranged from low to medium and was described satisfactorily by either the Langmuir two surface or the Freundlich equation but not by the Langmuir one surface equation. Correlation analysis indicated that oxalate extractable Fe was the soil component most active in P sorption. Although organic matter and pH were correlated to sorption capacity and may have been directly involved in the P sorption mechanisms they could also have covaried with other components responsible for sorption. Although citrate-dithionite extractable Fe did not appear to be involved in P sorption its high correlation with residual P fractions suggests an involvement with "slow" sorption. Phosphorous sorption had no apparent influence on P uptake by foxtail millet from the 12 soils in a Neubauer experiment.
Transformation of Inorganic Phosphorus Under Continuous Flooded Conditions and Wet-dry Cycles and the Phosphorus Sorption-desorption Characteristics of Two Acid Sulfate Soils
Author: Daud Bin Chinta
Publisher:
ISBN:
Category : Phosphorus
Languages : en
Pages : 276
Book Description
Publisher:
ISBN:
Category : Phosphorus
Languages : en
Pages : 276
Book Description
Selected Water Resources Abstracts
Author:
Publisher:
ISBN:
Category : Water
Languages : en
Pages : 492
Book Description
Publisher:
ISBN:
Category : Water
Languages : en
Pages : 492
Book Description
Effects of Organic and Inorganic Soil Amendments of Phosphorus Sorption
Author: Faustin Iyamuremye
Publisher:
ISBN:
Category : Soil absorption and adsorption
Languages : en
Pages : 288
Book Description
Publisher:
ISBN:
Category : Soil absorption and adsorption
Languages : en
Pages : 288
Book Description
Phosphorus Sorption, Accumulation and Leaching
Author: Katarina Börling
Publisher:
ISBN: 9789157664662
Category :
Languages : en
Pages : 39
Book Description
Publisher:
ISBN: 9789157664662
Category :
Languages : en
Pages : 39
Book Description
Properties and Management of Soils in the Tropics
Author: Pedro A. Sanchez
Publisher: Cambridge University Press
ISBN: 1107176050
Category : Business & Economics
Languages : en
Pages : 685
Book Description
Long-awaited second edition of classic textbook, brought completely up to date, for courses on tropical soils, and reference for scientists and professionals.
Publisher: Cambridge University Press
ISBN: 1107176050
Category : Business & Economics
Languages : en
Pages : 685
Book Description
Long-awaited second edition of classic textbook, brought completely up to date, for courses on tropical soils, and reference for scientists and professionals.
Sorption and Desorption of Inorganic Phosphate by Soils as Influenced by Inorganic and Organic Anions
Author: Keith David Earl
Publisher:
ISBN:
Category : Phosphates
Languages : en
Pages : 198
Book Description
Publisher:
ISBN:
Category : Phosphates
Languages : en
Pages : 198
Book Description
Phosphorus Adsorption and Movement in Soils
Author: Robert Walter Taylor
Publisher:
ISBN:
Category : Agricultural chemistry
Languages : en
Pages : 156
Book Description
Publisher:
ISBN:
Category : Agricultural chemistry
Languages : en
Pages : 156
Book Description
Phosphorus Sorption in Relation to Time, Temperature and Plant Availability
Author: Hassan Suliman Ibrahim
Publisher:
ISBN:
Category : Soil chemistry
Languages : en
Pages : 358
Book Description
Publisher:
ISBN:
Category : Soil chemistry
Languages : en
Pages : 358
Book Description