"P retention at ~pH4.6 (acc. Blakemore 1987)" . . "RetentP_blakemor"@en . "RetentP_blakemore" . . . "Blakemore L.C. Searle P.L. and Daly, B.K. (1987) Methods for chemical analysis of soils. NZ Soil Bureau, Lower Hutt, New Zealand." . .