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Shin Yabuta
Faculty of Agriculture, Kagoshima University, Kagoshima 890-0065, Japan

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Journal article
Published: 08 April 2021 in Agronomy
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Flooding and drought are major causes of reductions in crop productivity. Root distribution indicates crop adaptation to water stress. Therefore, we aimed to identify crop roots response based on root distribution under various soil conditions. The root distribution of four crops—maize, millet, sorghum, and rice—was evaluated under continuous soil waterlogging (CSW), moderate soil moisture (MSM), and gradual soil drying (GSD) conditions. Roots extended largely to the shallow soil layer in CSW and grew longer to the deeper soil layer in GSD in maize and sorghum. GSD tended to promote the root and shoot biomass across soil moisture status regardless of the crop species. The change of specific root density in rice and millet was small compared with maize and sorghum between different soil moisture statuses. Crop response in shoot and root biomass to various soil moisture status was highest in maize and lowest in rice among the tested crops as per the regression coefficient. Thus, we describe different root distributions associated with crop plasticity, which signify root spread changes, depending on soil water conditions in different crop genotypes as well as root distributions that vary depending on crop adaptation from anaerobic to aerobic conditions.

ACS Style

Phanthasin Khanthavong; Shin Yabuta; Hidetoshi Asai; Amzad Hossain; Isao Akagi; Jun-Ichi Sakagami. Root Response to Soil Water Status via Interaction of Crop Genotype and Environment. Agronomy 2021, 11, 708 .

AMA Style

Phanthasin Khanthavong, Shin Yabuta, Hidetoshi Asai, Amzad Hossain, Isao Akagi, Jun-Ichi Sakagami. Root Response to Soil Water Status via Interaction of Crop Genotype and Environment. Agronomy. 2021; 11 (4):708.

Chicago/Turabian Style

Phanthasin Khanthavong; Shin Yabuta; Hidetoshi Asai; Amzad Hossain; Isao Akagi; Jun-Ichi Sakagami. 2021. "Root Response to Soil Water Status via Interaction of Crop Genotype and Environment." Agronomy 11, no. 4: 708.

Journal article
Published: 12 January 2021 in Sustainability
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Regulation of non-structural carbohydrates (NSCs) are important for plants in response to submergence. In this study, the difference in non-structural carbohydrates in relation with shoot elongation between Sub1A and non-Sub1A rice genotypes was investigated. Two rice genotypes, namely Inpari30 (Sub1A genotype) and IR72442 (non-Sub1A genotype), were submerged completely for 6 days and re-aerated by lowering water level up to stem base for 6 days of post submergence. In addition, non-submerged plants (control) was treated with water level up to stem base during the experiment. Photosynthesis rate decreased in both submerged Inpari30 and IR72442 genotypes 71% and 96% lower than their control, respectively. Submerged IR72442 declined Fv/Fm 15.6% lowest than its control and both control and submerged Inpari30. Investigation of the distribution of starch and soluble sugar content in plant organs suggested that shoot elongation of non-Sub1A genotype led to starch and sugar consumption that distributed faster to the new developed organ during submergence. In contrast, Sub1A genotype of Inpari30, which did not exhibit shoot elongation and showed slower NSCs distribution during submergence, performed better on post submergence by maintaining NSCs and distributing to the new developed organ faster than IR72442. These results suggest that Sub1A genotype managed elongation and NSCs during submergence more efficiently than non-Sub1A genotype.

ACS Style

Arinal Nurrahma; Shin Yabuta; Ahmad Junaedi; Jun-Ichi Sakagami. Analysis of Non-Structural Carbohydrate in Relation with Shoot Elongation of Rice under Complete Submergence. Sustainability 2021, 13, 670 .

AMA Style

Arinal Nurrahma, Shin Yabuta, Ahmad Junaedi, Jun-Ichi Sakagami. Analysis of Non-Structural Carbohydrate in Relation with Shoot Elongation of Rice under Complete Submergence. Sustainability. 2021; 13 (2):670.

Chicago/Turabian Style

Arinal Nurrahma; Shin Yabuta; Ahmad Junaedi; Jun-Ichi Sakagami. 2021. "Analysis of Non-Structural Carbohydrate in Relation with Shoot Elongation of Rice under Complete Submergence." Sustainability 13, no. 2: 670.

Journal article
Published: 09 May 2019 in Agronomy
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Jatropha (Jatropha curcas L.) represents a renewable bioenergy source in arid regions, where it is used to produce not only biodiesel from the seed oil, but also various non-oil biomass products, such as fertilizer, from the seed cake following oil extraction from the seeds. Jatropha plants also generate large amounts of fallen leaves during the cold or drought season, but few studies have examined the utilization of this litter biomass. Therefore, in this study, we produced biochar from the fallen leaves of jatropha using a simple and economical carbonizer that was constructed from a standard 200 L oil drum, which would be suitable for use in rural communities, and evaluated the use of the generated biochar as a soil conditioner for the cultivation of Swiss chard (Beta vulgaris subsp. cicla “Fordhook Giant”) as a model vegetable in an acidic and undernourished soil in Botswana. Biochar application improved several growth parameters of Swiss chard, such as the total leaf area. In addition, the dry weights of the harvested shoots were 1.57, 1.88, and 2.32 fold higher in plants grown in soils containing 3%, 5%, and 10% biochar, respectively, compared with non-applied soil, suggesting that the amount of biochar applied to the soil was positively correlated with yield. Together, these observations suggest that jatropha fallen leaf biochar could function as a soil conditioner to enhance crop productivity.

ACS Style

Takafumi Konaka; Shin Yabuta; Charles Mazereku; Yoshinobu Kawamitsu; Hisashi Tsujimoto; Masami Ueno; Kinya Akashi. Use of Carbonized Fallen Leaves of Jatropha Curcas L. as a Soil Conditioner for Acidic and Undernourished Soil. Agronomy 2019, 9, 236 .

AMA Style

Takafumi Konaka, Shin Yabuta, Charles Mazereku, Yoshinobu Kawamitsu, Hisashi Tsujimoto, Masami Ueno, Kinya Akashi. Use of Carbonized Fallen Leaves of Jatropha Curcas L. as a Soil Conditioner for Acidic and Undernourished Soil. Agronomy. 2019; 9 (5):236.

Chicago/Turabian Style

Takafumi Konaka; Shin Yabuta; Charles Mazereku; Yoshinobu Kawamitsu; Hisashi Tsujimoto; Masami Ueno; Kinya Akashi. 2019. "Use of Carbonized Fallen Leaves of Jatropha Curcas L. as a Soil Conditioner for Acidic and Undernourished Soil." Agronomy 9, no. 5: 236.