Pengaruh Kompos Tandan Kosong Kelapa Sawit dan Asam Humat pada Tanah dan Hara Daun Kelapa Sawit Fase Tanaman Menghasilkan
DOI:
https://doi.org/10.25181/jaip.v13i2.4130Keywords:
cation exchange capacity, humic acid, nutrient uptake, organic fertilizer, soil fertilityAbstract
Soil fertility influences oil palm nutrient status, particularly its cation exchange capacity (CEC), which affects nutrient retention. This study aimed to evaluate the effect of different fertilizer treatments on oil palm (Elaeis guineensis Jacq.) soil CEC and leaf nutrient status in the yielding phase. The experiment was conducted using a randomized complete block design with four treatments and six replications: A = 2.5 kg NPKMg (12:12:17:2) per plant, B = 50 kg empty fruit bunch (EFB) compost per plant, C = 30 kg EFB compost + 300 mL humic acid per plant, and D = 10 kg EFB compost + 300 mL humic acid per plant. Observations included soil CEC and leaf N, P, and K levels. Results showed that the highest CEC value (45.89 cmol.kg-1) was observed in treatment A, while treatment C had the lowest (20.58 cmol.kg-1). Nitrogen content increased only in treatment A (+15.54%), whereas phosphorus content increased in all treatments, with the highest increase in treatment D (+92.59%). Potassium content generally decreased, except in treatment C (+2.63%). A strong positive correlation was found between soil CEC and leaf N (r = 0.91). In conclusion, inorganic fertilizer significantly enhanced CEC and leaf nitrogen, while humic acid with compost improved phosphorus uptake. However, potassium remained deficient across all treatments, indicating the need for better nutrient management strategies in oil palm plantations.
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