Kotur, S. C.; Ramesh, P. R.; Anjaneyulu, K.; Ramachandran, V. Evaluation of Cropping Sequences of Hybrid Vegetables for N Fertilizer Recovery Efficiency and Utilization of Residues Using 15N-Enriched Urea. Indian J Agri Sci 2012, 82 (9), 811–3. https://doi.org/10.56093/ijas.v82i9.23837.