Influences of not enough sun shining in winter on the meteorological factors of solar greenhouse in cold area
LU De-guo, DU Guo-dong, QIN Si-jun, LiU Guo-cheng (Horticultural College, Shenyang Agricultural University, Shenyang 110161,China)
The temperature condition of mid part in the solar greenhouse was the best with which of the east part was high in the morning and low in the afternoon, and which of the west part was the opposite. The changing patterns of temperature of the north, mid and south were similar to the east, mid and west. The temperatures of mid and north parts were higher than that of the south part, and the increasing degree of temperature of mid part was higher than that of south and north ones when the sun shining was good. The RH was always near saturation in cloudy and rainy days which was influenced slightly by opening and closed the mulching materials, and dropped rapidly after opening the straw matress when it was sun shining day and to the lowest point while the temperature increased to the highest point, then increased rapidly and near to the highest RH 1.5 hours after closed the straw matress and changed stably then. The back wall could be used widely because of the sun shine condition was good enough for the request of the plant growth.