CHANDRIKA, D. S., SHARMA, K. L., VIDYAVATHI, S., MUNNALAL, KUMAR, T. S., & RANI, K. U. (2016). Effect of conservation tillage, residue and nitrogen levels on soil nitrogen fractions and their contributions in nitrogen uptake in castor (Ricinus communis). The Indian Journal of Agricultural Sciences, 86(4), 474–80. https://doi.org/10.56093/ijas.v86i4.57456