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Survey of Wet and Dry Stress in Soybean in Japanese Farmers' Fields using Dry and Wet Indices Based on FAO56 Model

Tomohiro Konno, Tomoki Takahashi, Keiko Nakano, Rikiya Nira, Yuji Ohashi, Tadayuki Kudo, Norimasa Tanikawa, Makiko Moriya, Yoshifumi Nagumo, Masaharu Aoki, Takayoshi Uehara, Kiyoshi Okamoto (+22 others)
2020 Nippon sakumotsu gakkai kiji  

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Major factors that decrease soybean yields in Japan include excessive soil moisture and drought stress. In the present study, a WI (Wet Index) was developed using soil moisture estimates based on the FAO56 model to evaluate both risks of soil dryness and wetness. In addition, to assess the risk of wet losses, the days when ratio of WI was equal to one (RWI), which implied that soil moisture content reached a maximum, was adopted for every growth stage. When the relationship between WI or RWI
more » ... yield was evaluated using a partial correlation coefficient, WI had a positive correlation with emergence period approximately 30 -40 days after emergence, seed filling phase, and maturity phase, and RWI had a negative correlation with emergence period approximately 20 -30 days after emergence and approximately one week before flowering period. We evaluated moisture and drought stress risks, which present challenges in farmers' fields, and revealed the growing stages at which moisture and drought pose the highest risks. The results could offer critical insights for the estimation of dryness and wetness losses in the field.
doi:10.1626/jcs.89.337 fatcat:ohaes54bn5dbtna36cb5sbejwi
Citation

Tomohiro Konno, Tomoki Takahashi, Keiko Nakano, Rikiya Nira, Yuji Ohashi, Tadayuki Kudo, Norimasa Tanikawa, Makiko Moriya, Yoshifumi Nagumo, Masaharu Aoki, Takayoshi Uehara, Kiyoshi Okamoto, Yoshitaka Mukai, Kenji Nakamura, Masatoshi Oshima, Tomomi Kato, Kouhei Morisaki, Chikako Kuno, Shigeki Tabata, Naoya Kawarada, Yoshiyuki Mizutani, Kiyotaka Fujii, Hiroyuki Hasukawa, Hiroki Shintani, Tetsushi Oshio, Daiki Yamazaki, Junji Ito, Nobuhiro Michiue, Miyuki Mihara, Junko Fujimoto, Atsushi Nakatani, Shunsuke Higuchi, Mihoko Takeshita, Ryo Mochinaga. "Survey of Wet and Dry Stress in Soybean in Japanese Farmers' Fields using Dry and Wet Indices Based on FAO56 Model." Nippon sakumotsu gakkai kiji 89.4 (2020) 337-345