BABU S, RANA DS, YADAV GS, ANSARI MA. 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. 2013;83(3). doi:10.56093/ijas.v83i3.28340