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Assessment of the effect of time and temperature on the availability of residual phosphate in a glasshouse study of four soils using the Olsen method
Author(s) -
Javid S.,
Rowell D.L.
Publication year - 2003
Publication title -
soil use and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.709
H-Index - 81
eISSN - 1475-2743
pISSN - 0266-0032
DOI - 10.1111/j.1475-2743.2003.tb00310.x
Subject(s) - soil water , phosphate , chemistry , phosphorus , calcareous , dry matter , organic matter , zoology , incubation , calcareous soils , soil test , soil science , agronomy , environmental chemistry , environmental science , botany , biology , biochemistry , organic chemistry
. The Olsen method is an indicator of plant‐available phosphorus (P). The effect of time and temperature on residual phosphate in soils was measured using the Olsen method in a pot experiment. Four soils were investigated: two from Pakistan and one each from England (calcareous) and Colombia (acidic). Two levels of residual phosphate were developed in each soil after addition of phosphate by incubation at either 10 °C or 45 °C. The amount of phosphate added was based on the P maximum of each soil, calculated using the Langmuir equation. Ryegrass was used as the test crop. The pooled data for the four soils incubated at 10 °C showed good correlation between Olsen P and dry matter yield or P uptake ( r 2 = 0.85 and 0.77, respectively), whereas at 45 °C, each soil had its own relationship and pooled data did not show correlation of Olsen P with dry matter yield or P uptake. When the data at both temperatures were pooled, Olsen P was a good indicator of yield and uptake for the English soil. For the Pakistani soils, Olsen P after 45 °C treatment was an underestimate relative to the 10 °C data and for the Colombian soil it was an overestimate. The reasons for these differences need to be explored further before high temperature incubation can be used to simulate long‐term changes in the field.