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442 results on '"Inubushi, Kazuyuki"'

173. 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.

Author

Susilawati, Helena Lina, Setyanto, Prihasto, Makarim, Abdul Karim, Ariani, Miranti, Ito, Kimio, and Inubushi, Kazuyuki

Subjects
PADDY fields, TILLAGE, GREENHOUSE gas mitigation
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]

Published
2015
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174. Effect of soil types and nitrogen fertilizer on nitrous oxide and carbon dioxide emissions in oil palm plantations.

Author

Sakata, Rosnaeni, Shimada, Shuzoh, Arai, Hironori, Yoshioka, Naho, Yoshioka, Ryo, Aoki, Hiroshi, Kimoto, Narutoshi, Sakamoto, Atsushi, Melling, Lulie, and Inubushi, Kazuyuki

Subjects
SOIL classification, NITROGEN fertilizers, SOIL granularity, OIL palm, CARBON content of plants
Abstract

Oil palm (Elaeis guineensis Jacq.) production in Indonesia and Malaysia is currently the focus of concern due to its potential impact on the environment via greenhouse gas emissions. Oil palm plantations have been reported to release large quantities of nitrous oxide (N2O) into the atmosphere, which is most likely linked to nitrogen (N) fertilizer use. However, there are still limited studies comparing effects of the type of soil and N fertilizer on N2O and carbon dioxide (CO2) emissions. This study aimed to evaluate the effects of soil types and N fertilizer on N2O and CO2emissions in oil palm plantations. N2O and CO2emissions were measured for 15–16 months from 2010–2012 in Tunggal sandy loam soil, Indonesia, and in Simunjan sandy soil and Tatau peat soil, Malaysia. Within each site, treatments with coated fertilizer and conventional fertilizer, and unfertilized with and without tillage, were established. N2O and CO2fluxes showed high variabilities with seasons, types of soil and fertilizer treatments. The mean of the N2O fluxes from each treatment in the Simunjan sandy soil was the lowest among the three soils, ranging from 0.80 to 3.81 and 1.63 to 5.34 μg N m−2h−1in the wet and dry seasons, respectively. The mean of the N2O fluxes from each treatment in the Tunggal sandy loam soil ranged from 27.4 to 89.7 and 6.27 to 19.1 μg N m−2h−1in the wet and dry seasons, respectively. The mean of the N2O fluxes was found to be the highest among the three soils in each treatment of the Tatau peat soil, ranging from 131 to 523 and 66.1 to 606 μg N m−2h−1in the wet and dry seasons, respectively. The N application rate of coated fertilizer was about half that of conventional fertilizer and was applied as deep placement. In the Tungal soil, coated fertilizer reduced N2O emissions by 31 and 48% in wet and dry seasons, respectively, compared to the conventional fertilizer, and was similar to unfertilized treatment. However, N2O emissions increased in Simunjan and Tatau soils during dry seasons. There was no significant difference between treatments. These results show that N2O and CO2fluxes in the tropical oil palm plantations were significantly affected by the type of soil, but not always by fertilizer treatments. [ABSTRACT FROM PUBLISHER]

Published
2015
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180. Nitrogen‐regulated effects of free‐air CO2 enrichment on methane emissions from paddy rice fields

Author

ZHENG, XUNHUA, primary, ZHOU, ZAIXING, additional, WANG, YUESI, additional, ZHU, JIANGUO, additional, WANG, YULONG, additional, YUE, JIN, additional, SHI, YI, additional, KOBAYASHI, KAZUHIKO, additional, INUBUSHI, KAZUYUKI, additional, HUANG, YAO, additional, HAN, SHENGHUI, additional, XU, ZHONGJUN, additional, XIE, BAOHUA, additional, BUTTERBACH‐BAHL, KLAUS, additional, and YANG, LIANXIN, additional

Published
2006
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