Sumarno, Yenni Asbur, Murni Sari Rahayu. CHANGES IN RAINFALL ON PLANTING AREA AND OIL PALM PRODUCTION IN THE HIGHLANDS OF DELI SERDANG DISTRICT, NORTH SUMATRA. IJSET [Internet]. 2025 Nov. 17 [cited 2026 Jun. 9];4(10). Available from: https://ijset.org/index.php/ijset/article/view/71-75