CHANDRIKA DS, SHARMA KL, VIDYAVATHI S, MUNNALAL, KUMAR TS, RANI KU. Effect of conservation tillage, residue and nitrogen levels on soil nitrogen fractions and their contributions in nitrogen uptake in castor (Ricinus communis). Indian J Agri Sci. 2016;86(4):474–80. doi:10.56093/ijas.v86i4.57456