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. njaat [Internet]. 2025 Jun. 30 [cited 2025 Oct. 3];5(2A):183-90. Available from: https://www.njaat.com.ng/index.php/njaat/article/view/1102