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Effects of steel slag applications on CH 4 , N 2 O and the yields of Indonesian rice fields: a case study during two consecutive rice-growing seasons at two sites.
Effects of steel slag applications on CH 4 , N 2 O and the yields of Indonesian rice fields: a case study during two consecutive rice-growing seasons at two sites.
- Source :
- Soil Science & Plant Nutrition; Aug2015, Vol. 61 Issue 4, p704-718, 15p, 4 Charts, 5 Graphs
- Publication Year :
- 2015
-
Abstract
- The increasing human population requires greater rice production. However, rice cultivation contributes to global warming through greenhouse gas (GHG) emissions. Technologies for reducing GHG emissions in concert with the increased rice production from rice fields are needed. The objectives of this study were to evaluate the effects of steel slag applications on methane (CH4) and nitrous oxide (N2O) emissions and rice yields. Two study sites were established at the experimental farm belonging to Indonesian Agricultural Environment Research Institute (IAERI) in Jakenan and a farmer’s field in Wedarijaksa sub-district, Indonesia. Both field trials were conducted during the dry season (DS) of 2009 and the rainy season (RS) of 2009/2010. During the DS, a randomized block design was arranged with two treatments (a control and a steel slag application at 1 Mg ha−1), which were replicated five times. During the RS, the experimental plot with 1 Mg ha−1of steel slag treatment was split into two small sub-plots to accommodate the additional 1 and 2 Mg ha−1steel slag treatments. The results showed that there was a decreasing tendency in the CH4emissions at both sites and during both seasons after steel slag applications, although there was no statistical significance. During the RS in Jakenan, steel slag applications at rates of 1 and 2 Mg ha−1decreased the CH4emissions by 9.1 and 10.7%, respectively. In Wedarijaksa, steel slag applications at rates of 1 and 2 Mg ha−1decreased the CH4emissions by 12.6 to 18.7%, respectively. The N2O emissions were decreased by 34 and 38% following slag applications at the 2 Mg ha−1rate during the RS in Jakenan and Wedarijaksa, respectively. The iron content of steel slag could be used to reduce not only CH4but also N2O emissions. Increased level of electron acceptors suppresses CH4and N2O emissions. The application of steel slag at 1 and 2 Mg ha−1increased rice grain yields by approximately 4.8–5.6% in Jakenan and 0.3–4.7% in Wedarijaksa. It might be better to apply steel slag at higher rates for more than two growing seasons to reach reduction in CH4and N2O emissions. [ABSTRACT FROM AUTHOR]
- Subjects :
- PADDY fields
TILLAGE
GREENHOUSE gas mitigation
Subjects
Details
- Language :
- English
- ISSN :
- 00380768
- Volume :
- 61
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- Soil Science & Plant Nutrition
- Publication Type :
- Academic Journal
- Accession number :
- 109441592
- Full Text :
- https://doi.org/10.1080/00380768.2015.1041861