NDLI: Phosphorus Fractionation and Sorption in P-enriched Soils of Norway

Content Provider	Springer Nature Link
Author	Singh, B. R. Krogstad, T. Shivay, Y. S. Shivakumar, B. G. Bakkegard, M.
Copyright Year	2005
Abstract	Phosphorus (P) enrichment can lead to imbalance in nutrient availability and pollution of terrestrial and aquatic ecosystems. Hence studies were carried out to investigate fractionation and sorption of P in eleven P-enriched soils collected from different agro-climatic sites in Norway. Different P fractions viz. total, organic, inorganic (easily soluble P, Fe-P, Al-P, Ca-P and occluded P), Pw (water extractable), and NH4-lactate extractable P (PAL) at the beginning and after the completion of the experiments varied widely among the soils studied, indicating a wide variability of P supplying capacity of these soils. Soluble P was positively correlated to Ca-P (r = 0.94; P < 0.001), Pw (r = 0.87; P < 0.001), pH (r = 0.79; P < 0.01) and PAL (r = 0.79; P < 0.01), whereas it was negatively correlated with ammonium oxalate-extractable Al (Alox) (r = −0.68; P < 0.05). Iron-P was only moderately related to Alox(r = 0.64; P < 0.05) and Pox(r = 0.70; P < 0.05), whereas it was not related to any of the other parameters tested. The α [α = Pox/(Feox + Alox)] was highly correlated with PAL (r = 0.93; P < 0.001), pH (r = 0.87; P < 0.001), inorganic P (r = 0.80; P < 0.01) and Pw(r = 0.77; P < 0.01) but moderately to total P (r = 0.71; P < 0.05). Adsorption data fitted well to the Langmuir equation for most soils. The P affinity constant (k), adsorption maximum (b) and thus maximum buffering capacity (mbc) and adsorption isotherm of P were highest in the sandy clay soil from Øsaker, which also contained high amounts of Fe, Al and clay particles and the lowest in sandy soil from Vestrålen, which contained very high initial PALand the lowest content of Fe, Al, silt and clay among all the soils studied. The P affinity constant (k) was correlated positively and significantly to clay content (r = 0.66; P < 0.05), whereas mbc was correlated positively and significantly to clay content (r = 0.63; P < 0.05) and ammonium oxalate-extractable Fe (Feox) (r = 0.63; P < 0.05). Phosphorus desorption of the soils varied widely depending on the initial P status and texture of the soils. Phosphorus desorbed by NH4-lactate was many fold higher as compared to CaCl2 in most soils.
Starting Page	245
Ending Page	256
Page Count	12
File Format	PDF
ISSN	13851314
Journal	Nutrient Cycling in Agroecosystems
Volume Number	73
Issue Number	2-3
e-ISSN	15730867
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	P availability P fractions Soil properties Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science Soil Science

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