AHMADU, I.S.; IBRAHIM, U.; JIBRIN, D.M. THE EFFECT OF COMBINED APPLICATION OF ORGANIC UREA AND FARM YARD MANURE ON THE PERFORMANCE OF SPINACH AND NITRATE CONTENT IN THE NORTHERN GUINEA SAVANNA. Nigerian Journal of Agriculture and Agricultural Technology, [S. l.], v. 5, n. 2A, p. 183–190, 2025. Disponível em: https://www.njaat.com.ng/index.php/njaat/article/view/1102. Acesso em: 3 oct. 2025.