Saha, P., M. Akter, M. Miah, and S. Zaman. “Effects Of Organic And Inorganic Sources Of K On Rice Yield And Soil K Balance In The Rice-Rice Cropping System”. Bangladesh Journal of Agricultural Research, vol. 36, no. 2, Dec. 2011, pp. 305-11, doi:10.3329/bjar.v36i2.9258.