Article
Agronomy
Henry Perry, Daniela Carrijo, Bruce Linquist
Summary: The study found that midseason drainage can significantly reduce seasonal methane emissions, with reduction increasing with drainage severity, while timing of drainage has no significant impact on emissions. Nitrous oxide emissions were low, and yield was not significantly affected by drainage.
FIELD CROPS RESEARCH
(2022)
Article
Engineering, Environmental
Lena Abu-Ali, Scott C. Maguffin, Jai S. Rohila, Anna M. McClung, Matthew C. Reid
Summary: Rice is a staple food globally, but traditional cultivation methods lead to arsenic accumulation in rice grains. Alternate wetting and drying (AWD) is advocated for reduced arsenic levels, water savings, and decreased methane emissions. However, the effects of AWD on micronutrient element concentrations in rice grains are unclear. This study found that AWD tends to increase cationic element concentrations while decreasing oxyanionic element concentrations. The decrease in total arsenic in rice grains under AWD is mainly driven by changes in dimethylarsinic concentrations. The effects of AWD on grain composition were more significant in 2017 compared to 2018, possibly due to differences in dry-down timing during rice development. Additionally, interannual variability in grain elemental composition was observed in continuously-flooded fields, potentially influenced by warmer temperatures in 2018.
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
(2023)
Article
Environmental Sciences
S. M. Mofijul Islam, Yam Kanta Gaihre, Md. Rafiqul Islam, Md. Nayeem Ahmed, Mahmuda Akter, Upendra Singh, Bjoern Ole Sander
Summary: In rice cultivation, the use of urea deep placement and alternate wetting and drying irrigation can mitigate greenhouse gas emissions and reduce environmental pollution. Compared to conventional flooding irrigation, alternate wetting and drying irrigation significantly reduces cumulative methane emissions and greenhouse gas intensity, while urea deep placement increases rice yield and nitrogen recovery efficiency.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Agriculture, Multidisciplinary
Guangyan Liu, Junlin Zheng, Taotao Chen, Xuda Chen, Wei Chen, Yidi Sun, Poul Erik Laerke, Yinglong Chen, Kadambot H. M. Siddique, Daocai Chi, Ji Chen
Summary: Studies have shown that alternate wetting and drying irrigation (I-AWD) can improve water use efficiency in paddy fields, but also increase nitrous oxide (N2O) emissions. This study found that using zeolite as a soil conditioner can effectively reduce N2O emissions and increase rice grain yield under I-AWD. The combination of zeolite and urea is a sustainable approach for mitigating N2O emissions and improving rice grain yield in paddy fields.
AGRICULTURE ECOSYSTEMS & ENVIRONMENT
(2022)
Article
Green & Sustainable Science & Technology
S. M. Mofijul Islam, Yam Kanta Gaihre, Md Rafiqul Islam, Amina Khatun, Aminul Islam
Summary: Efficient fertilizer and irrigation management can reduce greenhouse gas emissions and increase crop yields. The use of integrated plant nutrient systems and deep placement of urea can effectively increase yields without increasing methane emissions.
Article
Agriculture, Multidisciplinary
Ping Liao, Yanni Sun, Xiangcheng Zhu, Haiyuan Wang, Yong Wang, Jin Chen, Jun Zhang, Yanhua Zeng, Yongjun Zeng, Shan Huang
Summary: The study shows that the application of nitrification inhibitors and biochar in rice paddies can significantly increase yield and reduce global warming potential. Controlled-release nitrogen fertilisers have no effect on global warming potential, but can increase rice yield. No-tillage and non-continuous flooding can reduce global warming potential, but have different impacts on rice yield.
AGRICULTURE ECOSYSTEMS & ENVIRONMENT
(2021)
Article
Agronomy
Siyu Li, Yun Chen, Tingting Li, Feng Yu, Yajun Zhang, Kun Liu, Hao Zhang, Junfei Gu, Jianchang Yang, Lijun Liu
Summary: This study found that combining alternate wetting and moderate soil drying irrigation (WMD) with low nitrogen fertilizer rates can maintain rice root growth, resulting in comparable grain yields to conventional farming practices but with higher nitrogen use efficiency.
Article
Environmental Sciences
Colby W. Reavis, Michele L. Reba, Daniel D. Shults, Benjamin R. K. Runkle
Summary: Rice, an important crop globally, has significant methane emissions. To understand the impact of sustainable management on reducing methane emissions, more information is needed. A regional methodology was applied to estimate methane emissions in different rice growing regions in the US, and it was found that introducing aeration events during irrigation can significantly reduce methane emissions.
ENVIRONMENTAL RESEARCH LETTERS
(2023)
Article
Agronomy
Edmond Alavaisha, Madaka Tumbo, Jacqueline Senyangwa, Sixbert Mourice
Summary: Water scarcity and nutrient availability for rice farming are major concerns in the face of global climate change and land use change. This study in the Kilombero Valley, Tanzania, aimed to understand the on-farm response of soil organic carbon (SOC), total nitrogen (TN), and total phosphorous (TP) to different water management practices in rice farming. The results showed that the AWD practice involving SRI for one cropping season had a positive effect on SOC and TN at all depths, suggesting that it is a viable approach for maintaining high SOC and TN levels while increasing crop production and minimizing water consumption.
Article
Engineering, Civil
Colby W. Reavis, Kosana Suvocarev, Michele L. Reba, Benjamin R. K. Runkle
Summary: This study focused on quantifying and characterizing evapotranspiration in commercial rice fields under different irrigation regimes. The comparison between alternate wetting and drying (AWD) and delayed flooding (DF) practices showed no significant differences in cumulative evapotranspiration or yield, indicating that AWD can help offset pumping costs and reduce pressure on irrigation water requirements while maintaining comparable yields to conventional practices.
JOURNAL OF HYDROLOGY
(2021)
Article
Agronomy
Eun-Kyung Jang, Emily Marie Lim, Jumi Kim, Moon-Jung Kang, Gayoung Choi, Jooyeon Moon
Summary: Agriculture, particularly rice paddy fields, is a major contributor to anthropogenic methane emissions. Changing water management practices in paddy fields has the potential to significantly reduce greenhouse gas emissions. Private participation in clean development mechanism projects can help mitigate risks associated with private investment, although more efforts are needed to promote farmer participation. This study identifies and categorizes risks and barriers to paddy water management in carbon reduction projects in India, Indonesia, and Mozambique.
Article
Agronomy
Takahiro Kakehashi, Mayumi Kikuta, Daniel Makori Menge, Emily Waringa Gichuhi, Hiroaki Samejima, Daigo Makihara
Summary: The study found that in the rice growing area of Kenya's highlands, implementing an alternate wetting and drying (AWD) system can increase filled grain ratio and mitigate the decrease in grain filling caused by low temperatures. While AWD may reduce above-ground biomass, its positive impact on grain filling outweighs this drawback and can still benefit rice farmers in the tropical highlands.
Article
Chemistry, Applied
Ming-Hsuan Chen, Anna M. McClung, Jai S. Rohila, Jinyoung Y. Barnaby
Summary: The study showed that the AWD irrigation has minimal impact on rice grain quality, while some US varieties are more resilient to warmer temperatures during the grainfill period, affecting milling yield, chalkiness, and functional traits.
Article
Soil Science
Zhen Wu, Yubing Dong, Xi Zhang, Xintong Xu, Zhengqin Xiong
Summary: Biochar application to soil is a promising tool for sequestering carbon, ensuring food security, and mitigating greenhouse gases and emissions of nitrous oxide and nitric oxide. However, limited research has been conducted on the long-term and practical effects of repeatedly amending biochar to soil. A three-year field experiment showed that biochar application significantly decreased methane, nitrous oxide, and nitric oxide emissions without hindering crop yield or mitigation of other greenhouse gases and nitrogen oxides.
Article
Agronomy
Komlavi Akpoti, Elliott R. Dossou-Yovo, Sander J. Zwart, Paul Kiepe
Summary: This study used machine learning models and water balance assessment to evaluate potentially irrigable lands for rice cultivation in Burkina Faso, and analyzed the climatic suitability for alternate wetting and drying (AWD) in the region.
AGRICULTURAL WATER MANAGEMENT
(2021)
Article
Agronomy
Yumiko Arai-Sanoh, Masaki Okamura, Jun Hosoi, Kenji Nagata, Toshiyuki Takai, Hitoshi Ogiwara, Junko Ishikawa, Hidemitsu Sakai, Takeshi Tokida, Nobuya Kobayashi
PLANT PRODUCTION SCIENCE
(2020)
Article
Agronomy
Satoshi Yoshinaga, Takeshi Tokida, Yasuhiro Usui, Hidemitsu Sakai, Hirofumi Nakamur, Toshihiro Hasegawa, Hiroshi Nakano, Yumiko Arai-Sanoh, Tsutomu Ishimaru, Toshiyuki Takai, Motohiko Kondo
PLANT PRODUCTION SCIENCE
(2020)
Article
Agronomy
Guoyou Zhang, Hidemitsu Sakai, Mayumi Yoshimoto, Hitomi Wakatsuki, Takeshi Tokida, Hiroki Ikawa, Miwa Arai, Hirofumi Nakamura, Toshihiro Hasegawa
Summary: Increasing atmospheric CO2 concentrations enhance the photosynthesis and productivity of C3 plants like rice, and exogenous application of kinetin can increase sink size in rice cultivars, leading to improved CO2 fertilization effect. However, the effect of kinetin on different cultivars varies.
JOURNAL OF AGRONOMY AND CROP SCIENCE
(2021)
Article
Green & Sustainable Science & Technology
Ai Leon, Kazunori Minamikawa, Taro Izumi, Nguyen Huu Chiem
Summary: In An Giang Province, Vietnam, the introduction of AWD technology has been shown to reduce LC-GHG emissions, lower the use of fertilizers and seeds, without significantly decreasing rice yields. Careful straw management is required to avoid an increase in LC-GHG emissions.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Plant Sciences
Kazunori Minamikawa, Masahiro Kodama, Hisayoshi Hayashi
Summary: Adding cashew nut shell liquid (CNSL) to paddy soil can reduce methane emissions without major harm to rice growth, indicating its potential as a sustainable method for mitigating greenhouse gas emissions from agriculture. The results suggest that further research is needed to develop effective application methods of CNSL in paddy fields to enhance its inhibitory effect on soil methane emission.
SOIL SCIENCE AND PLANT NUTRITION
(2021)
Article
Agricultural Engineering
Kenichi Uno, Kenji Ishido, Loc Nguyen Xuan, Chiem Nguyen Huu, Kazunori Minamikawa
Summary: The use of a simplified form of alternate wetting and drying (MD) known as multiple drainage in An Giang Province, Mekong Delta, Vietnam, has shown to increase rice yield and reduce methane emissions.
PADDY AND WATER ENVIRONMENT
(2020)
Article
Agriculture, Multidisciplinary
Kazunori Minamikawa, Khanh Cong Huynh, Kenichi Uno, Nam Sy Tran, Chiem Huu Nguyen
Summary: The combination of livestock biogas effluent application and multiple drainage can effectively reduce methane and nitrous oxide emissions without sacrificing rice yield in lowland areas of the Mekong Delta in Vietnam.
AGRICULTURE ECOSYSTEMS & ENVIRONMENT
(2021)
Article
Environmental Sciences
Kristine Samoy-Pascual, Sudhir Yadav, Gio Evangelista, Mary Ann Burac, Marvelin Rafael, Romeo Cabangon, Takeshi Tokida, Masaru Mizoguchi, Manuel Jose Regalado
Summary: This study empirically explores the factors influencing the adoption of Alternate Wetting and Drying (AWD) technique in a gravity surface irrigation system. The results show that farmers who practice enforced rotational irrigation scheduling are more likely to adopt AWD. The awareness factor does not play a significant role in the adoption, but the perception of water management as an effective weed control method is positively significant.
Article
Agriculture, Multidisciplinary
Masako Kajiura, Takeshi Tokida
Summary: A modified closed-chamber method was developed to estimate CH4 emissions from rice paddies. The study found that the estimated flux was sensitive to time length with short closure times but became less sensitive with longer closure. The minimum time length required for accurate flux measurement varied depending on the frequency of bubbling events.
JOURNAL OF AGRICULTURAL METEOROLOGY
(2022)
Review
Environmental Sciences
Haoyu Qian, Xiangchen Zhu, Shan Huang, Bruce Linquist, Yakov Kuzyakov, Reiner Wassmann, Kazunori Minamikawa, Maite Martinez-Eixarch, Xiaoyuan Yan, Feng Zhou, Bjoern Ole Sander, Weijian Zhang, Ziyin Shang, Jianwen Zou, Xunhua Zheng, Ganghua Li, Zhenhui Liu, Songhan Wang, Yanfeng Ding, Kees Jan van Groenigen, Yu Jiang
Summary: Rice paddies are an important source of staple food for half the global population, but they also contribute significantly to greenhouse gas emissions. This review explores the characteristics of these emissions and the potential strategies to mitigate their effects. The study finds that management practices play a crucial role in determining the level of emissions, and that future climate change is likely to increase these emissions. However, integrated agronomic management strategies offer potential for reducing greenhouse gas emissions.
NATURE REVIEWS EARTH & ENVIRONMENT
(2023)
Article
Agriculture, Multidisciplinary
Khanh Cong Huynh, Kazunori Minamikawa, Ngan Vo Chau Nguyen, Chiem Huu Nguyen, Cong Van Nguyen
Summary: This study aimed to test whether alternate wetting and drying (AWD) irrigation can increase rice grain yield (GY) under the application of biogas effluent (BE). The results showed that AWD increased GY by 12% in BE compared to continuous flooding (CF).
JARQ-JAPAN AGRICULTURAL RESEARCH QUARTERLY
(2022)
Article
Agriculture, Multidisciplinary
Khanh Cong Huynh, Kazunori Minamikawa, Ngan Vo Chau Nguyen, Chiem Huu Nguyen, Cong Van Nguyen
Summary: The study found that alternate wetting and drying (AWD) irrigation has a positive effect on rice grain yield (GY) under biogas effluent (BE) application, increasing GY by 12% in BE. Additionally, nitrogen use efficiency (NUE) indices were comparable between AWD and continuous flooding (CF) under BE and synthetic fertilizer.
JARQ-JAPAN AGRICULTURAL RESEARCH QUARTERLY
(2021)
Article
Agriculture, Multidisciplinary
Masako Kajiura, Takeshi Tokida
Summary: A method was developed to quantify methane emissions from rice-paddy soil through ebullition events. Field measurements at different rice growth stages showed that ebullition dominated at booting and heading stages, while plant-mediated emissions showed smaller variation among growth stages. Both ebullition and plant-mediated emissions were significantly correlated with air temperature, but ebullition showed a higher dependency on temperature compared to plant-mediated emissions.
JOURNAL OF AGRICULTURAL METEOROLOGY
(2021)
Article
Environmental Sciences
Kazuhiko Terazawa, Takeshi Tokida, Tadashi Sakata, Kenji Yamada, Shigehiro Ishizuka
Summary: Stem methane emission from trees in forested wetlands is an overlooked pathway that plays a significant role in methane budgets. Environmental factors such as soil temperature and water-table depth influence the flux of stem methane seasonally and annually. Flooding can dramatically increase stem methane emission, and isotopic analysis shows fractionation along the emission pathway. Further research is needed to explore the mechanisms behind the control of stem methane emission by belowground environmental conditions.
Article
Agriculture, Multidisciplinary
Takeshi Tokida
Summary: A modified closed-chamber method has been developed for high-throughput measurements of CH4 emissions from rice paddies, using a portable gas analyzer and a newly developed dehumidification system. This method significantly reduces chamber deployment time and effectively removes the risk of water condensation without attenuating CH4 concentration signal, making it suitable for high-throughput measurements and studying bubbling CH4 emissions.
JOURNAL OF AGRICULTURAL METEOROLOGY
(2021)