In some places in Shouguang City, the author saw a number of sheds in the interior of the back wall where they were covered with a thin film. The entire back wall was tightly packed. In the communication with farmers, it was learned that when the film on the back wall was a new shed, it was wrapped to prevent rain from flushing the back wall. After the shed was built, the vegetable peasant felt that the film was wrapped around the wall. It did not withdraw.

The author believes that there are both benefits and drawbacks to wearing a film on the rear wall of a greenhouse all year round.

In summer, it is good to coat the back wall of the greenhouse with a thin film. Because there is more rain in the summer and the temperature in the shed is higher, if it does not close the air outlet when it rains, and the southerly wind is more, the rain will pour on the back wall, and it is easy to flush some mud on the back wall. It will take a long time for the greenhouse to collapse. If the film is wrapped on the back wall, it can block the erosion of rain on the back wall and protect the back wall.

In winter, there are certain drawbacks to wearing a film on the back wall of a greenhouse. Because the temperature in the winter shed is low, especially the night temperature is low. Hanging the film on the back wall all the year round reduces the heat storage capacity of the wall. The wall has low heat storage capacity and the amount of heat released at night will be less. The night temperature in the shed will be lower than that of the shed film. In winter, this phenomenon is particularly prominent, and it affects the growth of vegetables for a long time.

Therefore, it is recommended that the vegetable farmer decides whether to leave the film according to the season. In the summer shed, a shelter film is installed on the back wall. After the winter comes, the shed film must be removed in time.

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