TY  - DATA  
TI  - Park Grass Soil Organic Carbon and Total Nitrogen 1856-2023 
CY  - Electronic Rothamsted Archive, Rothamsted Research 
DB  - e-RA - the electronic Rothamsted Archive 
PY  - 2026 
DP  - Rothamsted Research, Harpenden, Herts, AL5 2JQ, UK. 
M3  - xlsx 
ET  - 1.0 
LA  - None 
UR  - https://doi.org/10.23637/rpg5-PGsoilCN-01 
DO  - 10.23637/rpg5-PGsoilCN-01 
AU  - Poulton, Paul 
AU  - Glendining, Margaret 
AU  - Perryman, Sarah 
KW  - fertilizer, liming, long term experiments, Park grass long-term experiment, permanent grassland, soil, soil organic carbon, soil total nitrogen concentration, 
AB  - This dataset consists of the soil organic carbon (SOC), nitrogen (N), and soil weight, of individual plots of the Park Grass experiment, 1876-2023, and estimated values for when the experiment began in 1856. SOC and N were measured six times between 1876 and 2023. Soil weight was measured in 1876, 1959 and 2011/12. Data is given for the 0-23 cm soil depth. Not all plots were sampled on each occasion. Also included are details of the fertilizer and lime treatments applied. 



<b>Estimated starting values</b> for when the experiment began in 1856, before the fertilizer and lime treatments were started were 3.1% SOC and 0.26% N.  



On some plots, given ammonium salts but no lime, the soil became highly acidified and mats of undecomposed plant material have built up. These are indicated in the dataset. 



These soil data are discussed in Poulton et al. (2026).  
ER  -