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1st Int. Transborder Conf. of the Timor Island: Timor %u2013 Science without borderDili, 7-8 May 202568Fungal Endophytes of a Timorese Forest Resource: Morphological Identification from Santalum album LAgnes V. Simamora*, Mayavira V. Hahuly, Petronella S. Nenotek, Guria R. Seo, Marry C. Atanus, Speratus C.U. PasiAgrotechnology Study Program, Faculty of Agricultura, Universitas Nusa Cendana, Indonesia*Corresponding author: asimamora@staf.undana.ac.idAbstractLow levels of soil organic matter and nitrogen content are among the main challenges in agricultural soils in tropical regions. To enhance maize productivity in tropical drylands, it is essential to improve soil fertility by adding organic matter and nitrogen fertilizers, particularly through the use of locally available resources. This study investigated the effects of the interaction between rice husk biochar and tofu waste liquid fertilizer on nitrogen fertilization efficiency and maize yield. The experiment was conducted using a completely randomized block design with two treatment factors. The first factor was the rice husk biochar application rate, consisting of three levels: B0 (0 t/ha), B1 (5 t/ha), and B2 (10 t/ha). The second factor was the concentration of tofu waste liquid fertilizer, consisting of four levels: P0 (0 mL/L), P1 (150 mL/L), P2 (300 mL/L), and P3 (450 mL/L).The collected data were analyzed using analysis of variance (ANOVA) and the Duncan Multiple Range Test. The variables observed included soil organic carbon, total soil nitrogen, nitrogen fertilization efficiency, and maize yield. The results showed a significant interaction between rice husk biochar application and tofu waste liquid fertilizer concentration on total soil nitrogen and nitrogen fertilization efficiency. The best results were obtained with the combination of 10 t/ha of rice husk biochar and 450 mL/L of tofu waste liquid fertilizer.Keywords: rice husk biochar, tofu waste liquid fertilizer, nitrogen absorption