Tridge summary
As the summer season approaches, farmers need to be careful to reduce the damage caused by high temperatures during the flowering period of red beans. The Rural Development Administration (Chairman Jo Jae-ho) announced on the 6th that in an experiment examining the vulnerable period to a high temperature by each growing season, it was confirmed that the greatest damage from high temperature was seen during the flowering period (flowering period) of red beans. According to the Rural Development Administration, the damage rate was greatest in the T4 section, which was set 5 to 6 degrees higher than the outdoor temperature, as a result of dividing the red bean growth period before flowering, the flowering period, and the ripening period, and dividing the maximum temperature into four stages. In addition, the yield decreased by 39% during the growing season and 41% during the ripening period, compared to 83% during the flowering period due to high-temperature damage. Red bean is a temperate crop with a place of origin in Northeast Asia and is rather weak to high temperatures. In 2018, high-temperature damage occurred in 184,000 ha of field crops in Korea due to the scorching heat, and the red bean yield in Cheonan, South Chungcheong Province, decreased by 46% compared to the previous year. The Rural Development Administration explained how the red beans changed during the high-temperature experiment. When the temperature of red bean continues to be over 33 degrees Celsius during the growing season, the leaves turn wrinkled, and the high temperature and strong sunlight after the rainy season burns the leaves or turns yellow in some parts. This phenomenon reduces the amount of photosynthetic assimilation, which has a negative effect on the ability of leaves to make nutrients. During the ripening period, there is no significant difference in morphology due to high temperature. In addition, although the treatment period and temperature were shorter and lower during the flowering period than the growing period, the yield decreased the most because flowers were not seen at high temperature, the shape of pollen was damaged, and pods did not form.
The Rural Development Administration emphasized that it is important to maintain adequate soil moisture by watering (irrigation) in order to reduce the damage from high temperatures. In addition, he said he could consider cultivating early varieties such as ‘Hongda’ and ‘Hongmiin’, which can be planted early and harvested early, and advanced the flowering period to June earlier than August.