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). doi: 10.4081/ija.2017.818.