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Grain yield and protein levels between treatments. In (a-d), TPM, CPM, SPM, and CK represent an ordinary photovoltaic panel, a checkerboard photovoltaic panel, a translucent photovoltaic panel (with a light transmittance of 40%), and a comparison with field treatment, respectively. B and R denote the positions directly below and rear of the photovoltaic panel, respectively. Different lowercase letters represent significant differences between treatments at the 5% level.
