Pranata AJ, Simanjuntak BH. The Effect of Using Leonardite Mainic Acid as Urea Coater on The Growth And Yield Of Corn (Zea mays). G.Agr.Sci.J [Internet]. 2020Jun.25 [cited 2024Jul.5];6(1):17-33. Available from: https://ejournal.unida.gontor.ac.id/index.php/agrotech/article/view/3593