PRABHJYOT-KAUR, ASHU BALA, S. S. SANDHU, and K K GILL. “Yield Gap in Rice and Wheat Productivity in Different Agroclimatic Zones of Punjab”.
Journal of Agrometeorology
, vol. 17, no. 1, June 2015, pp. 127-9, doi:10.54386/jam.v17i1.989.