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http://dx.doi.org/10.5532/KJAFM.2021.23.3.163

Effects of Overall Shading and Partial Shading on the Response of Chlorophyll Fluorescence of Soybean  

Cho, Yuna (Department of Applied Plant Science, Chonnam National University)
Jo, Euni (Department of Applied Plant Science, Chonnam National University)
Jeong, Jae-Hyeok (National Institute of Crop Science, Rural Development Administration)
Yoon, Changyong (Jeollanam-do Agricultural Research & Extension Services)
An, Kyunam (Jeollanam-do Agricultural Research & Extension Services)
Cho, Jaeil (Department of Applied Plant Science, Chonnam National University)
Publication Information
Korean Journal of Agricultural and Forest Meteorology / v.23, no.3, 2021 , pp. 163-168 More about this Journal
Abstract
The growth experiment under shading condition has been performed to understand the eco-physiological responses of crops to light in terms of photosynthesis. There are two types of shading: overall shading and partial shading. In this study, the chlorophyll fluorescence of soybean was observed under the overall shading of the box made by polyresin and the partial shading at agrivoltaic system. The overall shading condition during vegetative growth induced lower SPAD and Electron transport rate (ETR). These lower values recovered after removal of shading box. However, the Non-photochemical fluorescence quenching (NPQ) became lower under overall shading and higher under partial shading. Such increase in NPQ limited crop photosynthesis even though the ETR was almost same to the control without shading treatment. Under the condition of partial shading, the values of SP AD and ETR for soybean did not change. However, the NPQ was higher than control condition. This suggests that the crop photosynthesis under both types of shading would be decreased by different eco-physiological processes which are the lower ETR in overall shading and the higher NP Q in partial shading despite the reduced light under shading conditions.
Keywords
Overall shading; Partial shading; Chlorophyll fluorescence; Agrivoltaic system; Soybean;
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