Uddin, M., M. A. Mian, M. Islam, M. Saleque, and A. Moslehuddin. “Changes In Different Forms Of K In Rice Rhizosphere Under K Application”. Bangladesh Journal of Agricultural Research, vol. 36, no. 3, Dec. 2011, pp. 513-9, doi:10.3329/bjar.v36i3.9279.