Breaking rice yield barrier with the ratooning method under changing climatic conditions: A paradigm shift in rice‐cropping systems in southwestern Japan

Nakano, Hiroshi; Tanaka, Ryo; Wada, Hiroshi; Okami, Midori; Nakagomi, Koji; Hakata, Makoto

doi:10.1002/agj2.20309

Cited by 29 publications

(42 citation statements)

References 30 publications

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“…We recently reported that a high total grain yield of the first and second crops (14.4 t ha -1 ) was produced in rice ratooning when the first crop was harvested at the normal time (1,200 °C days, cumulative mean air temperature from heading to harvest) with a high cutting height (50 cm from the ground surface) under high N application rate and air temperature conditions (Nakano et al, 2020b). The rice growing season will be extended in the near future since the world's average temperature is predicted to increase by 0.3-4.8 °C depending on the emissions scenario (IPCC, 2014).…”

Section: Future Prospectmentioning

confidence: 99%

Grain yield response to stubble leaf blade clipping in rice ratooning in southwestern Japan

et al. 2021

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Rice (Oryza sativa L.) ratooninghas recently attracted attention due to its higher yield potential compared with that of conventional methods. Field experiments were conducted in southwestern Japan in 2019 and 2020 to determine the effect of rice type ) and stubble leaf treatment (clipping and control) on the grain yields of the first and second crops in rice ratooning. In 2019, both rice types produced lower grain yields of the second crop in the leaf clipping treatment than the control treatment due to the lower spikelet number m −2 . Therefore, increasing the leaf area index (LAI) in the stubble may improve the grain yield of the second crop by increasing the spikelet number per area. In 2020, HYL produced a lower grain yield of the second crop in the leaf clipping treatment than the control treatment due to the lower spikelet number m −2 . However, the grain yields of Hokuriku 193 did not differ between the two leaf clipping treatments. Although the nonstructural carbohydrate (NSC) content in the stubble did not differ between the two rice types in 2019, Hokuriku 193 had a higher NSC content than HYL in 2020 due to the lower spikelet number m −2 and lower percentage of filled spikelets of the first crop. These results suggest that the stubble leaf blade contribution may be reduced when the NSC content is high as the leaf blades may compensate for the lack of NSC content when the NSC content is low.

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Section: Future Prospectmentioning

confidence: 99%

Grain yield response to stubble leaf blade clipping in rice ratooning in southwestern Japan

et al. 2021

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“…Rice is a staple food eaten by nearly half the world's populations (GriSP, 2013); thus, it provides food security for many developing nations. Rice ratooning could contribute to resolving the global food crisis by improving the total grain yield of the first and second crops (Nakano, Tanaka, Wada et al., 2020). Moreover, a recent study reported that the net economic return of ratooned rice was higher than those of single‐cropped mid‐season rice and double‐season rice (Yuan et al., 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Grain yields of the first and second crops are affected by the harvest time of the first crop. Recently, in southwestern Japan, we examined the effect of harvest time (before maturity and at maturity) and cutting height (20 and 50 cm from the ground surface) of the first crop on the grain yields of the first and second crops under high N application conditions using a high‐yielding line derived from a cross between Hokuriku 193 and an F1 cross between Hokuriku 193 and Bekoaoba (Nakano, Tanaka, Wada et al., 2020). Our results revealed that plants harvested at a cutting height of 50 cm produced a higher grain yield than those harvested at 20 cm.…”

Section: Introductionmentioning

confidence: 99%

Grain yield response to cultivar and harvest time of the first crop in rice ratooning in southwestern Japan

2021

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Rice (Oryza sativa L.) ratooning has attracted attention due to its higher yield potential compared with conventional methods. Here, field experiments were conducted in southwestern Japan in 2019 and 2020 to determine the effects of cultivar (‘Takanari’, an indica cultivar, and ‘Koshihikari’, a japonica cultivar) and harvest time of the first crop (early and late) on the grain yields of the first and second crops in rice ratooning. For Koshihikari in 2019, grain yield of the second crop did not differ between harvest times. However, Takanari produced a lower grain yield at late harvest. Takanari had fewer spikelets, fewer filled spikelets, and a lower 1,000‐grain weight at late harvest. However, for Takanari in 2020, grain yield did not differ between harvest times. In 2019, the stubble nonstructural carbohydrate (NSC) content did not increase from early to late harvest, whereas the stubble leaf area index (LAI) decreased between harvest times; this difference was more apparent in Takanari than in Koshihikari. Contrastingly, in 2020, the NSC content increased from early to late harvest, but the stubble LAI did not differ between harvest times. Thus, the lower grain yield of late‐harvested Takanari in 2019 might be attributed to the lower stubble LAI resulting in fewer spikelets. In contrast, the maintained grain yield from early to late harvest in 2020 might be attributed to the maintenance of spikelet numbers via the higher stubble NSC content. Therefore, the sufficient stubble LAI and NSC could be essential for improving grain yield of the second crop.

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“…In Japan, rice plantations account for approximately 35% (1.6 million ha) of total arable land. Field experiments aiming to enhance rice yields have been conducted in southwestern Japan (Nakano & Tsuchiya, 2012;Nakano, Morita, Kitagawa, Wada, & Takahashi, 2012, Nakano et al, 2020. Nitrogen (N) is the most important nutrient in rice fertilizer (Yoshida, 1981) and known to increase chlorophyll synthesis, photosynthetic rate, and leaf area index (Akita, Parago, & Coronel, 1987).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A weather‐adaptive topdressing method to enhance rice yield in southwestern Japan

et al. 2020

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Rice (Oryza sativa L.) plants grown in southwestern Japan are subjected to large variations in air temperature and solar radiation during the rainy season which can affect their growth. Therefore, in this study, a novel nitrogen (N) application method for topdressing was proposed to increase grain yield under different weather conditions. Field experiments were conducted to determine the grain yield response to the soil and plant analyzer development (SPAD) readings and normalized difference vegetation index (NDVI) during the early reproductive stage in 2018 and 2019. As the rainy season ended in early July in 2018 but continued until late July in 2019, the daily mean solar radiation during the vegetative and early reproductive stages was 26% lower in 2019 than in 2018. Grain yield was 10% lower in 2019 than in 2018, mainly due to the lower number of spikelets. During the early reproductive stage, the SPAD readings and NDVI were higher in 2019 than in 2018, suggesting that the biomass and N concentration in 2019 were lower and higher than those in 2018, respectively. Statistical modeling examination of grain yield response to growth-related factors revealed that the N application rate during the reproductive stage and SPAD readings were significant predictors in 2018, whereas the N application rate and NDVI were significant predictors in 2019. Our findings suggest that SPAD readings and NDVI are key factors for determining N application rate during the reproductive stage under higher and lower solar radiation conditions during the vegetative and reproductive stages, respectively. Abbreviations: NDVI, normalized difference vegetative index; SPAD, soil and plant analyzer development. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Breaking rice yield barrier with the ratooning method under changing climatic conditions: A paradigm shift in rice‐cropping systems in southwestern Japan

Cited by 29 publications

References 30 publications

Grain yield response to stubble leaf blade clipping in rice ratooning in southwestern Japan

Grain yield response to stubble leaf blade clipping in rice ratooning in southwestern Japan

Grain yield response to cultivar and harvest time of the first crop in rice ratooning in southwestern Japan

A weather‐adaptive topdressing method to enhance rice yield in southwestern Japan

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