Phosphorus retention in some soils of the Argentinean Mesopotamia

Phosphorus (P) sorption isotherms were derived for 13 soils of the Argentinean Mesopotamia with a wide range of physicochemical properties. Shaking time varied from 1 to 24 hours in order to estimate the phosphate buffering capacity (PBC), maximum P sorption capacity (MPSC), and P sorption energy (P...

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Bibliographic Details
Published in:	Communications in soil science and plant analysis Vol. 30; no. 9/10; pp. 1449 - 1461
Main Authors:	Quintero, C.E, Boschetti, G.N, Benavidez, R.A
Format:	Journal Article
Language:	English
Published:	Philadelphia, PA Taylor & Francis Group 01-05-1999 Taylor & Francis
Subjects:	Agronomy. Soil science and plant productions Biological and medical sciences Chemical, physicochemical, biochemical and biological properties Fundamental and applied biological sciences. Psychology Mineral components. Ionic and exchange properties phosphorus Physics, chemistry, biochemistry and biology of agricultural and forest soils retention soil soil chemistry soil physical properties soil properties Soil science Argentina South America America Sorption Soils Retention index Adsorption Phosphorus Bioavailability Exchangeable cation Comparative study
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Summary:	Phosphorus (P) sorption isotherms were derived for 13 soils of the Argentinean Mesopotamia with a wide range of physicochemical properties. Shaking time varied from 1 to 24 hours in order to estimate the phosphate buffering capacity (PBC), maximum P sorption capacity (MPSC), and P sorption energy (PSE). In addition, six rates of P, allowed to react with soil at field capacity for 63 days and labile P, non-labile P, and P in solution, were assessed after that time. The retention capacity of these soils ranged from medium to very low and P sorption was correlated not only with the content of amorphous aluminum (Al) and iron (Fe), but with the clay percentage of soils. Organic carbon was a variable not related to P retention. After two months, soils with more P fixation showed about 70% of the added P became non-labile with insignificant amounts in solution. In those showing low retention, P was distributed in the following proportion: 50 to 60% non-labile, around 40% labile, and less than 10% in solution, whereas for sandy soils, of very low fixation, 10 to 20% remained in solution and less than 40% became non-labile. The increase in the total P due to fertilization resulted in a relative increase in the more available forms for plants. At the same time, a proportional decrease of non-labile P was observed.
ISSN:	0010-3624 1532-2416
DOI:	10.1080/00103629909370299