Straw Composting with Biological Agent Inoculation and Application Biofertilizer to Increase Rice Production

Abstract

Problems using straw directly include the contamination of germs on the straw from the previous crop. Alternatives that can be done is by giving inoculant of biological decomposers. The purpose of the research to test isolates decomposer in the rate of straw decomposition in soil and to test isolates biofertilizer on rice plants in soil treated straw compost with water management system. Greenhouse experiment was conducted for selecting isolates and formulations decomposer consortium and biological agents as well as the selection and formulation of biological fertilizers isolates. This experiment was carried out using factorial randomized block design consisting of two factors with three replicates. The first factor: incubation time composting (1, 2, 3, and 4 weeks). The second factor is inoculants, formulation A containing microbes T. harzianum, B. subtililis, Cytophaga sp. and B. Licheniformis; i2 = Formulation B containing microbes B. subtililis, Cytophaga sp., and B. Licheniformis, Streptomyces sp. The field experiment was conducted to determine the effect of straw compost and biofertilizer inoculants (nitrogen fixation bacteria and phosphate solubilizing bacteria) on rice cultivation with water management system. Research at this stage using split plot experimental design was repeated three times. As the main plot was the dose of straw compost + biofertilizer consists of 8 factors (0 to 7.5 t ha -1 without and plus biofertilizer 400 g ha -1). As a subplot was doses of a inorganik fertilizer N, P and K consists of 5 factors (100%, 90%, 80%, 70% and 60% of recommendations dosages). The results showed that the inoculation of decomposer and biological agents that can be formulated in a single package that is based on the antagonistic test A formulation containing T. harzianum, B. subtililis, Cytophaga sp. and B. Licheniformis whereas B formulation contains B. subtililis, Cytophaga sp., and B. Licheniformis, Streptomyces sp. B formulation capable of decomposing straw is better than A formulation. Application of straw compost and biofertilizer (nitrogen fixation bacteria and phosphate solubilizing bacteria) with water management system could increase the yield of rice to 13.3% and substitute 20% of inorganic fertilizer (N, P and K). .