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1st Int. Transborder Conf. of the Timor Island: Timor %u2013 Science without borderDili, 7-8 May 202569Improvement Total Nitrogen, Exchangeable Potassium content of Alfisol and Yield of Tomato (Solanum lycopersicum Mill) by application combination treatment of Shallot Peel Waste, Rice Washing Water and Powder Active of CassavaNoni Ae*, I N. P. Soetedjo, and M. M. AirturFaculty of Agriculture, Universitas Nusa Cendana, Jl. Adisucipto, Kupang, NTT 85001, Indonesia*Corresponding author: noniaenonii@gmail.comAbstractGenerally, Alfisol has low nutrients such as Total Nitrogen and Exchangeable of Potassium results in less supporting growth, development and yield of plant. This condition could be improved by application liquid organic fertilizer (LOF) such as shallot peel waste and rice washing water. This is mainly due those LOFs contain some nutrients such as Nitrogen, Phosphorus, and Potassium which in could be used to improve soil nutrients and yield of plant. Moreover, the capability of LOF could be increased by application powder active of cassava (PAC), due to PAC might improve activity of soil microorganism which results in improvement of physical characteristic of soil. Research had been done at Technical Unit of Laboratory Dry lands island, University of Nusa Cendana April 2024 to March 2025. Research designed on Randomized Completed Block Design with three replications. Treatments of the research were P0 (no application of shallot peel waste, rice washing water and powder active of cassava), P1 (application 250 ml of shallot peel waste and 750 ml of rice washing water), P2 (application 500 ml of shallot peel waste and 500 ml of rice washing water), P3 (application 750 ml of shallot peel waste and 250 ml of rice washing water), P4 (application 250 ml of shallot peel waste and 0.05 g of powder active), P5 (application 500 ml of shallot peel waste and 0.06 g of powder active), P6 (application 750 ml of shallot peel waste and 0.07 g of powder active). All data were analyzed by using Anova and followed by Orthogonal Contrast Test. Result of the research showed that P6 (application 750 ml of shallot peel waste and 0.07 g of powder active) significantly effect to total Nitrogen content of Alfisol (0.17 %) and fresh weight of tomato by 920.67 g per plot. However, all treatments did not affect significantly to Exchangeable of Potassium. Moreover, the research show that application shallot peel waste combined by powder active of cassava of results in a higher total Nitrogen content and fresh weight of tomato compare to application shallot peel waste combined by rice washing water.Keywords: alfisol, liquid organic fertilizer, nitrogen, potassium, rice washing water, shallot peel waste.