This study aims to understand the morphological and physiological responses of coconut oil palm (Elaeis guineensis Jacq.) variety DxP PPKS Simalungun seeds to salinity stress during the pre-nursery phase. High-quality seeds are crucial for the successful growth and productivity of coconut oil palm plants in the field. The experiment employed a randomized group design with three salinity levels: no salinity, moderate salinity, and high salinity. Each treatment was repeated three times, with 10 seeds per repetition. Observed variables included plant height, stem diameter, number of leaves, chlorophyll content, root length, shoot length, fresh weight, volume, and dry weight of the plants. Data were analyzed using various methods of analysis of variance (ANOVA) followed by Duncan's multiple range test (DMRT) at a 5% significance level when significant effects were detected. The results showed that moderate salinity induced the best growth response, particularly in stem diameter from week 2 to week 8, as well as in the fresh weight of roots and shoots. Plant height was superior under non-saline conditions only during the third week, while the number of leaves and chlorophyll content showed no significant differences. This study indicates that DxP PPKS Simalungun coconut oil palm seeds possess good tolerance to salinity stress during the pre-nursery phase.
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