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Tuyishime, Jean Rene Marius, 2016. Sequential phosphorus extraction using iron (hydr)oxide-impregnated filter paper strips. Second cycle, A2E. Uppsala: SLU, Dept. of Soil and Environment



Phosphorus (P) is an important element for crop production. A low concentration limits crop growth whereas the residual quantity after fertilization contributes to eutrophication of surface waters. A key to success in the soil P management is its accurate estimation and potential supply to the plant. The objective of this project was to compare the soil P extractability between the Pi- filter strip method and P depletion without a sink (0.01 M CaCl2). The results were compared to those obtained using ammonium lactate (AL), Olsen (OL) soil P tests. The results showed that the efficiency of different methods decreased in the order Pi (62-85%) > OL (25-40%) > 0.01 M CaCl2 (8-24%) of the total P extracted by AL. A strong correlation (r = 0.99) was obtained between the pairs (Pi; AL), (Pi; OL), and (OL; AL). Further, it was found that all methods were equally well correlated (the r was between 0.88 and 0.90) with the depletion method. The soil with the highest P adsorption capacity had higher values of P extracted by the AL, Pi and OL methods but was lower in 0.01 M CaCl2 extractable P. The results indicated that in the soils studied, the efficiency of the Pi-filter strip method in comparison to the routine P tests (AL and OL) was not attributed to the soil properties. It was rather attributed to the length of soil P desorption time and the number of filter strips.

Main title:Sequential phosphorus extraction using iron (hydr)oxide-impregnated filter paper strips
Authors:Tuyishime, Jean Rene Marius
Supervisor:Gustafsson, Jon-Petter and Braun, Sabina
Examiner:Berggren Kleja, Dan
Series:Examensarbeten / Institutionen för mark och miljö, SLU
Volume/Sequential designation:2016:15
Year of Publication:2016
Level and depth descriptor:Second cycle, A2E
Student's programme affiliation:NM010 Soil and Water Management - Master's Programme 120 HEC
Supervising department:(NL, NJ) > Dept. of Soil and Environment
Keywords:phosphorus, Pi-filter strip, desorption, depletion, soil phosphorus tests
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Subject. Use of subject categories until 2023-04-30.:Soil science and management
Soil chemistry and physics
Soil fertility
Deposited On:12 Jul 2016 14:10
Metadata Last Modified:12 Jul 2016 14:10

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