YIELD OF ORGANIC RICE AS AFFECTED BY AZOLLA AND BIOFERTILIZER AMENDMENT TO RICE STRAW AS ORGANIC FERTILIZER FOR SUSTAINABLE LOWLAND RICE PRODUCTION

Rice is a stapple food consumed by most Indonesian people.Increasing the number of residents encourages an increase in rice production, so land intensification needs to be done.Now, the trend of a healthy lifestyle that is environmentally friendly encourages the creation of organic farming.The effort of keeping the nutrient needs at the organic agriculture could be applied with rice straw and Azolla utilization.This research was intended to find out the best dosage combination of organic fertilizer and biofertilizer to total nitrogen, chlorophyll content, and yield of rice.The experiment used randomized block design (RBD) which consisted of six treatments and four repetitions, that was combination of organic fertilizer, Azolla, solid biofertilizer, and liquid biofertilizer.The variabel observed was nitrogen content of soil, chlorophyll content, and crop yields.The research result shows that application of rice straw compost 10 ton ha-1 with liquid biofertilizer 5 L ha-1 can increase the rice yield up to 6.01 ton ha-1 , it was almost twice compare with farmer practise which is use only rice straw compost.Addition of azolla 7.5 tons ha-1 in the previous treatment did not increase rice yields and even obtained the same rice yield but it was useful for maintaining soil quality and increasing rice yield next planting season.