BACKGROUND
Indonesia, India and China are the three countries that emit the most methane from paddy fields (methane emitting countries). In all three countries, rice planting is generally done by using a system inundation (flooding). Such a condition is causing anaerobic soil conditions allowing the formation of CH4. CH4 mitigation technologies in rice has been found as the provision of water is lost (intermitant), the use of rice varieties lawyer low CH4 emissions and the use of organic materials are composted. However, the technology is not none of CH4 mitigation implemented by farmers in Indonesia. The main reason is due to lack of awareness of the importance of mitigating CH4 farmers due to lack of knowledge of farmers and farmers do not feel the immediate benefit of this CH4 mitigation.
One of the basic principles of SRI rice production is giving way just enough water to moisten the soil through the provision of water is lost (intermitant) and fields are not flooded. Thus, anaerobic conditions that allow the formation of CH4 is not the case. Although the application of SRI method of rice production through already done a lot of farmers, but there is no research on CH4 emission reductions associated with SRI method of paddy production When the rice production SRIini way in the adoption by farmers largely because farmers feel the direct impact of the way to produce rice through SRI with increased production of rice, then it implies the application of SRI method This will also reduce CH4 emissions nationally.
This study aims to investigate the methane emission from paddy fields cultivated by SRI (Organic and inorganic) compared to the emission of methane in rice fields cultivated by conventional means.
MATERIALS AND METHODS
The study was conducted in Nagrak Organic S.R.I. Training Center, Sukabumi, since April 2008. Land use rice fields have properties such as pH (5.5 - 5.6); organic material (2.76 - 4.83%), N-total (0:15 to 12:26%), available P (1.7 - 4.1 ppm P), Ca (10.94 - 13.74 me/100g), K (0:56 to 1:28 me/100g), Mg (3.02 - 3.60 me/100 g), CEC (19.65 - 21.72 me/100g), KB (80.51 - 91.84%), with a loamy texture class (clay).
What fields have been planted in S.R.I. organic for three consecutive seasons. Seeds Ciherang old rice varieties are planted 8 days specifically used for rice cultivation under SRI technology whereas for conventional rice seeds used Ciherang aged 30 days. Treatments were: (T0) How Conventional (T1) SRI Method Inorganic; (T2) S.R.I. Organic and (T3) S.R.I. + Bio-Organic fertilizer. Inorganic fertilizer is used for the treatment of conventional and SRI method Inorganic same ie 250 kg urea / ha, 100 kg and 100 kg KCl SP-36/ha / ha. As for the organic fertilizer at SRI treatment SRI Organic and Bio-Organic fertilizer + is 5 tons / ha. Spacing for the conventional way of 20 cm x 20 cm, while for SRI spacing is 30 cm x 30 cm. The provision of water is done by flooding to the conventional way while the SRI method done with the water cut (intermitant). Experimental plot size was 4 mx 4 m with four replications. Weeding is done manually.
Taking CH4 do with containment measures 1m x 0.5 mx 0.5 m to be backed with aluminum plateform. Samples were taken at 14, 28, 42 and 56 days after planting. CH4 measurements performed using Shimadzu GC 17A.
RESULT
CH4 emissions at various ages rice
CONCLUSION
- CH4 emissions in ways conventional rice production 'is always higher than the CH4 emissions SRI method of rice production S.R.I well-Inorganic, S.R.I. Organic and Organic SRI by giving biofertilizer.
- In-Organic SRI can occur sinks (sinks) of CH4
- There is a tendency that the SRI-Inorganic N2O higher yield than the conventional method of rice production and SRI-Organic
REFERENCES
Saved. , 2006. Free water-saving rice cultivation System of Rice Intensification (SRI). Decentralized Irrigation System Improvement Project in Eastern Regional of Indonesia (JBIC ODA Loan IP-509). Japan Bank for International Cooperation.
ACKNOWLEDGEMENTS
PT Kujang Amanah Tani (PT KAT) Biological Organic Fertilizer manufacturers have Fertismart finance our participation in the Seminar and Exhibition Rice and to Mr. H. Ahmad Jatika, business Nagrak Organic S.R.I. Training Center has helped completely organizing this study, we thank you very much. Special support is given Saved (S.Sato) has enabled the analysis of CH4 can be completed. For that we thank you.
