SINGH, Ravindra; AGARWAL, S K. Effect of levels of farmyard manure and nitrogen fertilization on grain yield and use efficiency of nutrients in wheat (Triticurn aestivum). The Indian Journal of Agricultural Sciences, Delhi, India, v. 75, n. 7, 2005. Disponível em: https://epubs.icar.org.in/index.php/IJAgS/article/view/9084. Acesso em: 27 oct. 2025.