HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Related articles in JEQ Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (11) Citing Articles via Google Scholar Google Scholar Articles by Koopmans, G. F. Articles by van Riemsdijk, W. H. Search for Related Content PubMed PubMed Citation Articles by Koopmans, G. F. Articles by van Riemsdijk, W. H. Agricola Articles by Koopmans, G. F. Articles by van Riemsdijk, W. H. Related Collections Phosphorus Plant and Soil Interactions Remediation Nutrient Cycling Soil Chemistry

Phosphorus Availability for Plant Uptake in a Phosphorus-Enriched Noncalcareous Sandy Soil

^a Alterra, Wageningen University and Research Centre (WUR), P.O. Box 47, 6700 AA, Wageningen, the Netherlands
^b Department of Soil Quality, Wageningen University, WUR, P.O. Box 8005, 6700 EC, Wageningen, the Netherlands

View larger version (22K): [in a new window]   Fig. 1. Cumulative dry matter production in the 5- and 10-cm treatments.

View larger version (20K): [in a new window]   Fig. 2. Cumulative plant uptake of P from the soils of the 5- and 10-cm treatments. To guide the eye, lines, fitted to the data using an exponential curve, have been added.

View larger version (15K): [in a new window]   Fig. 3. Relationship for the soils of the 5- and 10-cm treatments between the P concentration in 1:2 (w/v) water extracts and (A) phosphorus extractable with a filter paper strip impregnated with iron oxide (FeO-P) and (B) , which was calculated as Pox/(Al + Fe)ox [with Pox and (Al + Fe)ox in mmol kg–1]. To guide the eye, lines, fitted to the data using an exponential curve, have been added.

View larger version (16K): [in a new window]   Fig. 4. Relationship for the soils of the 5- and 10-cm treatments between the P concentration in 1:10 (w/v) 0.01 M CaCl2 extracts and , which was calculated as Pox/(Al + Fe)ox [with Pox and (Al + Fe)ox in mmol kg–1]. To guide the eye, a line, fitted to the data using a double exponential curve, has been added.

View larger version (22K): [in a new window]   Fig. 5. The desorption isotherm for the soils of the 5- and 10-cm treatments describing the relationship between the P concentration in 1:10 (w/v) 0.01 M CaCl2 extracts and the total pool of sorbed P (Pox corrected for the amount of P in the CaCl2 extracts). The Langmuir equation was fitted to the data.

View larger version (20K): [in a new window]   Fig. 6. Relationship for the soils of the 5- and 10-cm treatments between the average P concentration, calculated from the P concentration measured in 1:10 (w/v) 0.01 M CaCl2 extracts at two subsequent sampling points, and the P content of the grass harvested since the previous sampling point. The filled symbols of the 5- and 10-cm treatments, representing the average P concentration in the CaCl2 extracts at t0 and t1 and the P content of the grass harvested since t0, were not included in the linear regression analysis, because these data points deviate significantly from the line.

View larger version (23K): [in a new window]   Fig. 7. Relationship between the measured and estimated cumulative plant uptake of P. In the filled symbols of the 5- and 10-cm treatments, representing the cumulative plant uptake of P at t8, P measured in root residues was included.