TUALAR SIMARMATA, ANIA CITRARESMINI, BRILJAN SUDJANA, BENNY JOY, TIEN TURMUKTINI
Padjadjaran University Bandung, Dept. of Soil Sciences and Land Resources, Indonesia
University of Singaperbangsa Karawang, Fac. of Agriculture, Indonesia
University of Winaya Mukti, Dept. of Agronomy, Indonesia
Indonesian's food security is hazardous due to rapidly growing population, soil health degradation and water scarcity problem. Since 2007 different nutrient management techniques have been developed (1) biofertilisers inoculant (consortia of Azotobacter sp, Azosprillum sp, Pseudomonas sp and Bacillus sp), (2) decomposer inoculant (consortia of Streptomyces sp, Cytophaga sp, Bacillus sp, and Trichoderma sp) for composting rice straw, (3) organic ameliorant (75-90% of straw compost + 10-25% of rice husk biochar). These techniques were introduced as an integrated organic-biofertilisers based nutrients management and water saving technology, known as SOBARI (system of organic based aerobic rice intensification). This technology should remediate the soil health, reduce the inorganic fertilisers uses, increase the efficiency of water irrigation use and to increase the rice production in sustainable ways. The SOBARI uses efficient water condition from muddy to -5 to -10cm as indicated at the water gauge of the water level indicator, it uses young seedlings (12-15 days), a widely planting space (30 cm30cm or 30 cm35cm), two single seedlings are planted at each planting cross section with a distance of 5cm, and it further uses 2-5 ton ha organic ameliorant and 500 - 1000 g ha of biofertilisers inoculant. The field experiments and demo plots results from 2007-2015 at different locations (provinces) in Indonesia revealed that (1) the SOBARI as integrated water saving technology increased the efficiency of water irrigation uses by 35%, (2) twin seedling planting technique of SOBARI increased the rice grain yield by 20-30% as compared to conventional methods, (3) application of 2-5 ton haof organic ameliorant and biofertilisers reduced the application of inorganic fertilisers by 25-50%, improved soil health (soil organic carbon, nutrients status in soils) significantly, and increased the rice productivity by 50--200%. Therefore, SOBARI has a great prospect to increase the rice productivity from 5-6 ton ha to 6-8 ton ha of grain yield relatively easy nationalwide for securing the food resilience in Indonesia.
Keywords: Biofertilisers, food security, organic fertilisers, SOBARI, straw compost