Application of Immature Rice Straw Compost, Azolla, and Urea for Increasing Rice Fields Production Based on Local Wisdom

Local wisdom of incorporating immature rice straw compost technology on a rice field at age of 35 days, followed by urea fertilizer had been applied by farmers in order to solve the soil fertility problems. The objectives of this research were: (1) to find the best combination of immature rice straw compost application, and the amount of Azolla and urea fertilizer, (2) to analyze the effectiveness of Azolla application in improving the supply of nitrogen to fulfill nitrogen requirement, (3) to analyze the changes in soil organic matter content before and after technological innovation of application of immature rice straw compost and incorporation of Azolla and urea fertilizer. A Randomized Block Design (RBD) was used in this study with five treatments and four replications: a) immature rice straw compost + urea 100 kg/ha (the treatment of farmers); b) immature rice straw compost + urea 75 kg/ha + Azolla 200 g/m 2, ; c) immature rice straw compost + urea 50 kg/ha + Azolla 200 g/m 2, ; d) immature rice straw compost + urea 25 kg/ha + Azolla 200 g/m 2, ; e) immature rice straw compost + Azolla 200 g/m 2. . The result showed that treatment of immature rice straw compost application + Azolla 200 g/m 2 + 75 kg urea/ha produced dry grain of 6.14 ton/ha. This result was not significantly different to that of immature rice straw compost application + urea 100 kg/ha. Distribution of Azolla 200 g/m 2 was able to reduce