Camilla Emanuella Borba Pereira P and K content can be found in publication Baxter, Ivan, et al. "Biodiversity of mineral nutrient and trace element accumulation in Arabidopsis thaliana." PLoS one 7.4 (2012): e35121.
Nitrogen content is highly variable:
Fabien Chardon, Julien Barthélémy, Françoise Daniel-Vedele, Céline Masclaux-Daubresse, Natural variation of nitrate uptake and nitrogen use efficiency in Arabidopsis thaliana cultivated with limiting and ample nitrogen supply, Journal of Experimental Botany, Volume 61, Issue 9, May 2010, Pages 2293–2302, https://doi.org/10.1093/jxb/erq059