Abstract: In order to improve cultivated soil temperature of overwintering crops in solar greenhouse, 20cm (T1), 30cm (T2) and 40cm (T3) high foam board were buried inside south wall of solar greenhouse in different place,taking without foam board as CK. The temperature of different depth soil 30cm away from south wall was observed for 30 days, the heat preservation effect of different treatments was studied.The results showed that burying foam boards inside south wall was beneficial to increase the indoor soil temperature. There was close correlation between soil temperature and the height of foam boards among the three treatments, and T3 showed the best effect. The south margin soil temperature increased 1-2℃ compared to CK. Heat storage did not affected in sunny day, and the soil temperature could be kept above 8℃ in rainy days and snowy days, which could avoid freeze injury. The treatments increased the root activity significantly without affecting normal growth of the planting crops (tomato). The results could provide basis to reduce the damage of meteorological disasters to agricultural production in greenhouse, and to guidance overwintering crops production.

Key words: Foam board, Edge effect, Soil temperature, Overwintering tomato