Dataset: Rothamsted long-term liming experiment exchangeable cations re-analysed

The experiment tests the effects of different amounts of lime (and thus soil pH), P and K on a sequence of arable crops, on a silty clay loam soil at Rothamsted Experimental Farm, Harpenden, from 1962-1996. Archived topsoil samples from six years between 1964 and 1989 were re-analysed in 2019 for a range of soil exchangeable cations, by extraction with ammonium nitrate (NH₄NO₃). Topsoil was analysed from all plots and sub-plots (where present), except sub-plots given Mg in 1974-1978. There was a parallel experiment at Woburn Experimental Farm.