NURYANTO, E.; GOUW, E. ANALYSIS OF MACRONUTRIENS CONTENTS IN SOIL WITH NEAR INFRA RED (NIR) SPECTROSCOPY. Jurnal Penelitian Kelapa Sawit, [S. l.], v. 25, n. 2, p. 85–94, 2017. DOI: 10.22302/iopri.jur.jpks.v25i2.27. Disponível em: https://jurnalkelapasawit.iopri.org/index.php/jpks/article/view/27. Acesso em: 4 sep. 2026.