“Utility of NPK Fertilizer in The Growth of Bok Choy (Brassica Rapa L.) Using a Sprinkler Irrigation System”. J-AGENT (Journal of Agricultural Engineering and Technology) 3, no. 2 (June 23, 2025). Accessed December 9, 2025. https://journal.unram.ac.id/index.php/agent/article/view/9056.