Butt, R.M., Akhtar, M.S., Mehmood, A., Imran, M., Rukh, S., Kayani, G.S., Siddique, M.T., Abbasi, K.S., Qayyum, A. and Ahmad, Z. 2017. Relationship of soil potassium forms with maize potassium contents in soils derived from different parent materials. Italian Journal of Agronomy. 12, 2 (Jun. 2017). DOI:https://doi.org/10.4081/ija.2017.818.