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Increasing crop productivity can be done through improved cultivation technology by utilizing agricultural waste. This study aims to determine the development of late blight Phytophthora sp. and yields of potato crops through the application of trikokompos and rice husk biochar. Potato varieties used are Granola, perfect tillage 60 cm spacing between rows and 30 cm between seeds in one bed, beds covered with plastic mulch, fertilizing using NPK according to recommendations, weeding weeds according to conditions, controlling pests and diseases based on Integrated Pest Control. The difference in technological treatment studied was 1) trikokompos 10 tons/ha, 2) trikokompos 10 tons/ha + rice husk biochar 1 ton/ha, 3) trikokompos 10 tons/ha + rice husk biochar 2 tons/ha, and control (farmer technology without trikokompos and without rice husk biochar). The environmental design used was a Randomized Block Design (RBD) with 7 replications. Data were analyzed by The F test and further tests used with Duncan. Results showed that the intensity of late blight Phytophthora sp. was lower in potato plants that were treated with trikokompos and rice husk biochar. Application of trikokompos + rice husk biochar 2 tons/ha increased potato productivity to 27 tons/ha (28.6% higher than the control), and increasing the quality of potato tubers, especially XL tubers.