Miko Herlangga and Eka Bobby Febrianto 2026. THE EFFECT OF HARVEST FREQUENCY AND LABOR EFFICIENCY ON THE PRODUCTIVITY OF OIL PALM ( Elaeis guineensis) Jacq.) PALM CO REGIONAL 1 RAMBUTAN GARDEN, AFDELING VIII SEI PRIOK VILLAGE. International Journal of Social Science, Educational, Economics, Agriculture Research and Technology (IJSET). 5, 8 (Jul. 2026), 4285–4292.