Can Yields of Lowland Rice Resume the Increases that They Showed in the 1980s?

Horie, Takeshi; Shiraiwa, Tatsuhiko; Homma, Koki; Katsura, Keisuke; Maeda, Shuhei; Yoshida, Hiroyuki

doi:10.1626/pps.8.259

Cited by 169 publications

(105 citation statements)

References 61 publications

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“…2.2.1 Treatments and their combination: Primary treatment components included were based on results from a previous SRI experiment in Indonesia (Sato and Uphoff, 2007;Keisuke et al, 2007), and common management methods for conventional rice farming in Japan (Horie et al, 2005).…”

Section: Experiments Detailsmentioning

confidence: 99%

Achieving More with Less Water: Alternate Wet and Dry Irrigation (AWDI) as an Alternative to the Conventional Water Management Practices in Rice Farming

Chapagain¹,

Riseman²,

Yamaji³

2011

JAS

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Alternate Wet and Dry Irrigation (AWDI) is a water management system where rice fields are not kept continuously submerged but are allowed to dry intermittently during the rice growing stage. A field experiment was conducted in Chiba, Japan during the rice growing season (May-September) of 2008 to assess AWDI and continuous submerged water management practices for their effects on productivity, the surrounding environment, water savings, and Water Productivity Index (WPI). The impact of age of seedlings and plant spacing were also assessed.AWDI using the proposed irrigation schedule of 10 wet days alternated with 10 dry days used less water (29% less water) without significant reduction in grain yield (7.2 t/h) compared with conventional irrigation (7.8 t/h). Water Productivity Index was significantly higher in all sub-plots in AWDI treatments. WPI was 1.7 kg/m 3 in AWDI treatments compared to 1.3 kg/m 3 in conventional water management. Additional significant results from AWDI treatment included reduced pest and disease incidence, shortened crop cycle, and reduced lodging. However, slightly higher grain yields were observed in all sub-plots of the conventional irrigation treatment than were observed in the same combinations under AWDI. This underscores the need for further research in defining what constitutes an optimum interval for AWDI considering local soil properties, prevailing climate, and the critical periods during the rice growth cycle when the yield was particularly sensitive to moisture stress.Keywords: Alternate wet and dry irrigation (AWDI), System of rice intensification (SRI), Water savings, Water productivity index (WPI), Split-split plot design (S-SPD)

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Section: Experiments Detailsmentioning

confidence: 99%

Achieving More with Less Water: Alternate Wet and Dry Irrigation (AWDI) as an Alternative to the Conventional Water Management Practices in Rice Farming

Chapagain¹,

Riseman²,

Yamaji³

2011

JAS

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“…The production of rice increased double from 1960 to 2010 depending on yield increase, which was caused by improvement of cultivar, cropping and resource management [1]. However, recent climatic disasters make the production unstable [2].…”

Section: Introductionmentioning

confidence: 99%

Adaptability of High-Yielding Rice Cultivars in Relation to Biomass Productivity under Moderately Water Stressed Upland Conditions

Hyoda¹,

Homma²,

Shiraiwa³

et al. 2015

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Recent studies have focused on the improvement of rice productivity under aerobic conditions for times when water resources and food production are limited. This study aimed to evaluate the adaptability of high-yielding rice cultivars to moderately water-stressed upland conditions in order to contribute breeding. A three-year field experiment in the temperate climate of Kyoto, Japan, indicated that the decrease in yield was mainly derived from a decrease in above-ground total dry matter (TDM) rather than a decrease in harvest index (HI). Although the decrease in TDM was mostly caused by a decrease in radiation use efficiency (RUE), we determined that the key to adapting high-yielding cultivars to upland conditions is intercepted radiation per day (IRPD), governed by leaf area index (LAI). Although the effect was not robust, LAI growth under upland conditions was associated with root length density. RUE was dependent on leaf water potential (LWP), indicating that a plant's ability to maintain LWP under water-stressed conditions is important. The results also suggest the necessity of a canopy analyzer to evaluate LAI, as well as an infrared radiation thermometer to evaluate RUE. Performing such measurements during breeding efforts allows us to select for genotypes that are suitable for less stressed aerobic conditions.

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“…For example, Horie et al (2005) suggested -based on their review of past scientific knowledge and their research data (Takai et al 2006) -that a higher crop growth rate (CGR) at the late reproductive stage (2 weeks before heading) would be the most effective change for realizing higher yield. This concept implies that a high CGR can sustain an increase in spikelet numbers by controlling their degeneration together with high dry matter production which will contribute to boosting yield potential.…”

Section: Introductionmentioning

confidence: 99%

Towards an understanding of the high productivity of rice with System of Rice Intensification (SRI) management from the perspectives of soil and plant physiological processes

Toriyama

Ando

2011

Soil Science and Plant Nutrition

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The System of Rice Intensification (SRI) is based on a set of practices such as transplanting young seedlings and aerobic soil management during the vegetative stage without using costly external input, which attracted rice researchers because of higher yields compared with conventional flooded practices. This review assesses some field data for SRI performance in light of current knowledge about certain agronomic practices, focusing particularly on nitrate production in aerobic paddy soil and the possible effect of differences in nitrate uptake on rice growth, as this could help explain some part of rice performance with SRI. Aerobic soil environments realized with SRI management might be favorable for nitrification as well as for the expansion of rhizosphere area, which could enhance nitrate uptake and boost the yield potential of rice. The effect of nitrate uptake and assimilation under SRI practice on dry matter production should be studied comprehensively to explore the possibility of breaking the yield ceiling of rice.

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Can Yields of Lowland Rice Resume the Increases that They Showed in the 1980s?

Cited by 169 publications

References 61 publications

Achieving More with Less Water: Alternate Wet and Dry Irrigation (AWDI) as an Alternative to the Conventional Water Management Practices in Rice Farming

Achieving More with Less Water: Alternate Wet and Dry Irrigation (AWDI) as an Alternative to the Conventional Water Management Practices in Rice Farming

Adaptability of High-Yielding Rice Cultivars in Relation to Biomass Productivity under Moderately Water Stressed Upland Conditions

Towards an understanding of the high productivity of rice with System of Rice Intensification (SRI) management from the perspectives of soil and plant physiological processes

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