The objective of this research was to evaluate the effects of compost and liquid organic fertilizer on the culture of organic tomato (Lycopersicon esculentum Mill) and eggplant (Soanum melongena L.) in order to develop a suitable fertilization management. The result indicated that there were significantly different on the yield of tomato and eggplant among some treatments. The best yield (23.3 t/ha) of tomato was showed on the treatment with application of bagasse sawdust compost 20 t/ha with liquid organic fertilizer 20 l/ha. The lowest yield (17.4 t/ha) of tomato was showed on the application of dairy compost 30 t/ha. The difference of tomato yield index was 34% between them. For the yield of organic eggplant, the best treatment was 22.6 t/ha on the application of bagasse sawdust compost 60 t/ha with liquid organic fertilizer 40 l/ha. The yield index was more than the blank treatment (10.4 t/ha) for about 119%. Therefore, the treatments of bagasse sawdust compost 20 t/ha with liquid organic fertilizer 20 l/ha and bagasse sawdust compost 60 t/ha with liquid organic fertilizer 40 l/ha were appropriated and suitable for organic tomato and eggplant, respectively. However, correct and suitable use of compost may increase and maintain the conditions of soil fertility.

Key words: organic tomato, organic eggplant, compost, liquid organic fertilizer.