Ahmad M, Khan I, Muhammad D, Mussarat M, Shafi MI. Effect of Phosphorus Sources and their Levels on Spring Maize: Effect of Phosphorus on Spring Maize. Pakistan Journal of Scientific & Industrial Research [Internet]. 2019 Apr. 8 [cited 2024 Apr. 30];62(1):8-14. Available from: http://v2.pjsir.org/index.php/biological-sciences/article/view/344