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The effect of soil Ph on olsen bicarbonate phosphate values
Author(s) -
SornSrivichai Puntipa,
Tillman Russell W.,
Syers J. Keith,
Cornforth Ian S.
Publication year - 1984
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740350303
Subject(s) - lime , chemistry , soil water , bicarbonate , soil ph , incubation , phosphate , environmental chemistry , zoology , agronomy , soil science , environmental science , geology , paleontology , biochemistry , organic chemistry , biology
The effect of increases in soil pH by liming on Olsen bicarbonate phosphate (P) test values was investigated using two contrasting New Zealand soils: a highly P retentive Egmont soil and a Tokomaru soil with a low P retention capacity. After incubation with three rates of Ca(OH) 2 , soil pH was increased, and a reduction in the Olsen P values was observed. The amounts of 32 P‐exchangeable P, however, increased with increasing soil pH, and there was very little change in water‐extractable P. The addition of lime had no significant effect on either the yield or uptake of P by ryegrass grown on the same soils in the glasshouse. It appears that the decline in Olsen P values in soils following liming is a result of an artefact in the Olsen procedure. High concentrations of Ca are involved in the decrease in Olsen P values in limed soils. It is suggested that the precipitation of calcium phosphates in the Olsen extracts of limed soils is responsible for the decrease in the Olsen P values. In a field experiment, increasing soil pH by lime addition also resulted in a decrease in the Olsen P values.