In recent days, farmers in Henan and Hebei have consulted with reporters that they have finished harvesting in autumn and they want to free up plots to build vegetable greenhouses. For this reason, they would like to ask: How long is the vegetable greenhouse projected to be the most appropriate?

The reporter answered in a phone call that if the construction of the shed plot is not limited by the area, it is most appropriate to construct a 80-100 m greenhouse. analyse as below:

The first is that a greenhouse is too short to be worthwhile. Regardless of the length of the greenhouse and the construction of both the east and the west walls, the area of ​​land occupied by the greenhouse is certain to a certain extent. Therefore, the funds spent on building the two walls of vegetable greenhouses are also certain. For example, to build a 50-meter-long greenhouse, like building a 100-meter-long greenhouse, you need to set aside a 5-6-meter-wide block to build an east or west wall. The rest of the land is a growing crop. Compared with the latter, the input-output ratio of the former is much smaller than that of the latter. Therefore, the latter is better, and it is not recommended to build a “short shed” less than 50 meters.

The second problem is that the greenhouses are long and there are many drawbacks. First of all, weaving grasshoppers is strenuous. Since the shed is too long and wide, a shed has to use at least two roller shutters with a power of 1.5 kW or more to pull the grass rake. Otherwise, it is not feasible to use only one roller shutter. If you manually pull the grasshopper, the work intensity is too great. Second, it has increased the difficulty of laying steel wire on the shed. Shed steel wires need to be pulled out from east to west, and then fixed on the ground anchors of the two walls of the east and west. Like a 200-meter-long greenhouse, pulling a steel wire on the roof is not only difficult but also difficult to fix. In addition, it is very difficult to replace the film. Generally 100 meters long sheds, replace the shed film twelve people is enough, like this 200 long shed, at least 25 people can guarantee the smooth completion. In summary, the "long greenhouse" is not suitable for the current greenhouse vegetable production.

It can be seen that in order to avoid wasting land, save money, and increase the input-output ratio of the shed, it is recommended that the majority of peasants should be able to construct sheds of 80 to 100 meters.

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