Effect of Different Levels of Nitrogen Fertilizer, Fungal Biofertilizer, and Algal Biofertilizer on Urease Enzyme Activity and Nutrient Availability for Barley (Hordeum vulgare L.). (2026). Euphrates Journal of Agricultural Science, 18(2). https://ejs-agri.com/index.php/EJAS/article/view/699