PREDICTING THE VARIABILITY OF COPPER AND ZINC IN LEAF AND SOIL OF OIL PALM PLANTED ON A 12 HA LAND USING GEOSPATIAL INFORMATION SYSTEM TECHNOLOGY. J. Teknol. [Internet]. 2015 Dec. 13 [cited 2024 Dec. 20];77(24). Available from: https://journals.utm.my/jurnalteknologi/article/view/6717