"The Effectiveness of Mycorrhiza (Mycovir) in Improving the Adaptation of Root Systems of Pre-Nursery Oil Palm Seedlings in Marginal Environments".

This study evaluated the effectiveness of mycorrhizal biofertilizer (Mycovir) in enhancing the adaptive growth of oil palm (Elaeis guineensis Jacq.) seedlings under marginal environmental conditions. Marginal conditions were simulated using nutrient-poor ultisol soil and low-quality swamp water as irrigation sources. A completely randomized design with five Mycovir dosage levels (0, 5, 10, 15, and 20 g/polybag) and five replications was applied. Results showed that mycorrhizal application had no significant effect on shoot growth parameters, but significantly increased root length. The highest root length (33.89 cm) was recorded at the 15 g/polybag treatment, indicating that mycorrhizae mainly support root development as an adaptive response under stress conditions. Therefore, 15 g/polybag was identified as the optimum dose for improving oil palm seedling adaptation during the pre-nursery stage.