Singh, K. K., Jat, A. S., & Sharma, S. K. (2005). Improving productivity and profitability of rice ( Oryza sativa)-wheat (Triticum aestivum) cropping system through tillage and planting management. The Indian Journal of Agricultural Sciences, 75(7). https://epubs.icar.org.in/index.php/IJAgS/article/view/9081