SURI, V K, and U K PURI. “Effect of Phosphorus Application With and Without Farmyard Manure on Rainfed Maize (Zea Mays) - Wheat (Triticum Aestivum) - Maize Sequence”. The Indian Journal of Agricultural Sciences, vol. 67, no. 1, May 2013, https://epubs.icar.org.in/index.php/IJAgS/article/view/29825.