Firdaus, Jonni, Usman Ahmad, I Wayan Budiastra, and I Dewa Made Subrata. “Macro-Nutrient Prediction of Paddy Field Soil Using Artificial Neural Network and NIR Spectroscopy”. Jurnal Keteknikan Pertanian 12, no. 2 (August 7, 2024): 242–258. Accessed December 24, 2025. https://journal.ipb.ac.id/jtep/article/view/56477.