Effects of the novel CdTe photovoltaic solar greenhouse on the growth,photosynthetic characteristics and quality of summer lettuce

MA Haohao; HUANG Xiao; LIU Yongpeng; SHANG Wenkai; LUO Hengbin; QI Pengfei; MEI Fang; WANG Dapeng; LI Xiping; ZHOU Penghua; XU Mingming; ZHANG Ya; ZHANG Tao

doi:10.16861/j.cnki.zggc.2025.0283

Abstract：To promote the transformative application of photovoltaic technology in the high-quality development of agri-culture in China,this study compared a conventional solar greenhouse with 60％shading as a control group with a novel CdTe photovoltaic solar greenhouse with 60％shading.The study investigated changes in summer air temperature,air hu-midity,and light intensity,as well as their impacts on lettuce growth,photosynthetic characteristics,and quality.The re-sults indicate that compared to the conventional solar greenhouse with 60％shading,the novel CdTe photovoltaic solar greenhouse significantly reduced the amount of solar radiation entering the greenhouse and the transmittance of sunlight.The light intensity inside the greenhouse decreased by over 46％,the air temperature dropped by more than 3 ℃,and the air humidity increased by over 30％.The photovoltaic solar greenhouse also significantly enhanced the chlorophyll con-tent,net photosynthetic rate,transpiration rate,and stomatal conductance of lettuce,while significantly reducing the inter-cellular CO2 concentration.Compared to the conventional solar greenhouse with 60％shading,the novel CdTe photovolta-ic solar greenhouse showed significantly improved all growth indicators of lettuce for 28 days after planting.The plant height increased by over 31％,the number of leaves rose by more than 19％,and the fresh and dry mass increased by 15％and 32％,respectively;all nutritional quality indicators also showed significant improvement,with soluble solids,soluble sugars,soluble proteins,and vitamin C content increasing by 0.43 percentage points,0.04 percentage points,25％,and 72％,respectively.Additionally,the average monthly power generation from June to September 2024 was 2,076.08 kWh.In conclusion,the novel CdTe photovoltaic solar greenhouse demonstrates significant economic benefits in summer lettuce cultivation,providing crucial theoretical support for the application of the agricultural-photovoltaic complementary model in photovoltaic solar greenhouses.