Greenhouse gas emissions and rice yield from different rice varieties using Gora Systems and Walik Jerami Systems in Rainfed Lands

Abstract

The rapid development has resulted in the shrinkage of relatively fertile irrigated price fields. To increase the yields, various rice varieties are recommended but their GHG emissions remain largely unknown if planted in two different system (e.g.gogorancah and walikjerami).This study aims to determine GHG emissions and rice yields from various varieties in rainfed lowland areas. The research was conducted at experimental station of Indonesian Agricultural Environmental Research Institute, PatiCentral Javaduring the 2015/2016 high season. Eight high yielding rice varieties (Ciherang, Mekongga, Inpari 18, IPB 3S, Inpari 13, Inpari 31, Inpari 32 and Inpari 33) were planted in boxes measuring 1 m2 on a 5 x 6 m2 plot. The experiment was designed in a randomized block design with three replications. CH4 and N2O samples were taken using manual GHG gauges. The results showed that the CH4 emissions released from the eight varieties were significantly different at the level of P <0.05. The highest CH4 emission in the gora system was in the IPB 3S variety of 532.89 kg CH4/ha/season while the highest CH4 emission in the wajer system was shown by the Inpari 32 variety of 482.35 kg CH4/ha/season. The highest N2O emission in the gora system was in the Ciherang variety of 0.75 kg N2O/ha/season, while the highest N2O emission in the wajer system was shown by the Inpari 32 variety of 0.57 kg N2O/ha/season. The highest average rice yield was shown by the Inpari 32 variety which was 7.78 t/ha higher in the gora system than the wajer system.