KUMAR, A. and THAKUR, K.S. (2011) “Effect of intercropping in-situ green manures and fertility levels on productivity and soil nitrogen balance in maize (Zea mays)–gobhi sarson (Brassica napus) cropping system*”, The Indian Journal of Agricultural Sciences, 79(9). Available at: https://epubs.icar.org.in/index.php/IJAgS/article/view/2506 (Accessed: 16 June 2026).