S. BABU, D. S. RANA, G. S. YADAV, and M. A. ANSARI, “Residual effect of sunflower (Helianthus annuus) stover and P management and direct effect of N and P on productivity, nutrient uptake and economics of spring sunflower”, Indian J Agri Sci, vol. 83, no. 3, Mar. 2013, doi: 10.56093/ijas.v83i3.28340.