The infrared heating device used in the field warming scientific experiment is suspended above the experimental site. Through the infrared radiation characteristics, it directly radiates the target object to produce a thermal effect, simulating the warming effect of sunlight. It is used to warm the environment in climate change to analyze the changes in plant and soil characteristics under temperature changes.

The research team used the field warming method and adopted custom-made infrared emitters with specifications of 220V, 2000W, and 1600mm. Five infrared emitters were hung at a distance of 1m from the east, south, west, north, and top of the lychee tree to enclose the canopy and provide 24-hour warming. This resulted in a significant increase in the longitudinal and transverse diameters of the fruit, increasing by 8.7% and 11.0% respectively compared to the control. The single fruit weight and single seed weight also increased significantly, by 19.8% and 50.0% respectively. Warming significantly improved the fruit color, with the anthocyanin content of the fruit from the warming treatment increasing by 31.9% compared to the control, making the fruit redder and more vibrant. Warming also affected the internal quality of the fruit, with the VC content and sugar-acid ratio of the warmed fruit increasing by 22.3% and 22.6% respectively compared to the control, and the titratable acid decreasing by 17.6%.

It can be seen that under field conditions, by adopting scientific cultivation methods, it is possible to achieve obvious results such as larger and more plump lychee fruits, higher fruit yield and sweetness, and more attractive appearance of the variety.