COMBINATION OF WATER SAVING TECHNOLOGYAND ORGANIC FERTILIZER FOR CH4 MITIGATIONIN RICE PADDY CULTIVATION

Climate change as one of the global warming impacts is a phenomenon of the increasing temperature of the earth that takes place globally from year to year. Global warming occurs as the result of the greenhouse effect, the increased emissions of gases such as carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and chlorofluorocarbons (CFC) that trap the solar energy in the earth atmosphere. Paddy rice cultivation is the biggest contributor to CH4 gas emissions produced through anaerobic decomposition of organic material in the flooded irrigation system and through nitrous oxide gas generated from the volatilization of nitrogen as a result of intensive administration of inorganic fertilizers. This paper deals with irrigation technology, paddy field cultivation, and emissions. The study used a Randomized Block Design as the environmental design and split-plot as the treatment design. The main plot was Water-saving Technology (A) consisting of three levels, which were Surface (Flooded) Irrigation of 5cm (A1), Intermittent Irrigation (A2), and Saturated Water Conditions (A3). The subplot was a dosage of an organic fertilizer made from local raw material, fermented water hyacinth (bokashi) (P) consisting of 3 levels, which were 800 kg/ha (P1), 1,000 kg/ha (P2), and 1,200 kg/ha (P3). The results showed that the highest CH4 emissions were obtained from the flooded irrigation treatment combined with organic fertilization of 1,200 kg/ha. There were no differences in terms of production in all treatment combinations. The differences in production only occurred in the average treatment of irrigation, in which the highest production occurred in the flooded irrigation treatment.