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1st Int. Transborder Conf. of the Timor Island: Timor %u2013 Science without borderDili, 7-8 May 202557Identification of Insect Pests Causing Gall of Eucalyptus urophylla And Eucalyptus alba and Intensity of Their Damage in Fatumnasi,Fatukoko and Noinbila, West TimorS. R. F. Al Amin, P. S. Nenotek*, A. E. Nahas, R. Ludji, D. H. Kadja, P.A. Tegol and Y. D. PengoAgrotechnology Study Program, Faculty of Agricultura, Universitas Nusa Cendana, Indonesia*Corresponding author: petronella.nenotek@staf.undana.ac.idAbstractLow of soil organic matter and nitrogen content, is one of the main problems in agricultural soils in the tropics. To increase the productivity of maize grown in tropical drylands, it is necessary to improve soil fertility by adding organic matter and fertilizing nitrogen, especially by using locally available resources. In this case, the study analysed the effect of the interaction of rice husk biochar and tofu waste liquid fertilizer on the efficiency of nitrogen fertilization and corn yield. The study was performed using a completely randomized block design arranged with two treatment factors. The first factor was the dose of rice husk biochar consisting of three different levels: B0 (0 t/ha), B1 (5 t/ha) and B2 (10 t/ha)., and the second factor was the concentration of tofu liquid waste fertilizer which consists of four levels : P0 (0 mL/L), P1 (150 mL/L), P2 (300 mL/L) and P3 (450 mL/L). The observation data were analysed with analyses of variance and the Duncan Multiple Range Test. The variables observed were: organic carbon and total nitrogen of soil, nitrogen fertilization efficiency, and weight of corn. The results showed that there was an interaction between the dose of rice husk biochar and the concentration of tofu waste liquid fertilizer on the total nitrogen of soil and the efficiency of nitrogen fertilization. The best treatment was a 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