PAIKARAY RK, MAHAPATRA BS, SHARMA GL. Effect of organic and inorganic sources of nitrogen on productivity and soil fertility under rice (Oryza sativa) -wheat (Triticum aestivum) crop sequence. Indian J Agri Sci. 2014;72(8). Accessed October 25, 2025. https://epubs.icar.org.in/index.php/IJAgS/article/view/40970