Did you know? Now farmers no longer have to rely on the weather to grow vegetables, but on these transparent plastic greenhouses! I went to the suburbs to pick strawberries last week. It was so hot in the greenhouse that I was sweating, but the farmer, Uncle Wang, said happily: "This temperature is just right for strawberry growth. It would have been freezing before."
Plastic greenhouses are transparent houses for crops. I remember when I was a child, my grandfather used bamboo poles to build a simple shed, which has now been upgraded to a "mansion" of steel frame + plastic film. The biggest feature of this greenhouse is that it can "steal seasons" - grow summer fruits in winter, and water and fertilize on rainy days. Once I visited a greenhouse vegetable base and saw cucumber vines blooming and bearing fruit in the cold winter, which was like magic.
The three unique features of plastic greenhouses are: first, the plastic film, which is both light-transmitting and heat-insulating, like a thermostatic down jacket for plants; second, the ventilation design, the "windows" on both sides of the greenhouse that can be rolled up are particularly smart, and they automatically open the windows to dissipate heat when the temperature is high; finally, the insect-proof net, which keeps the nasty pests out, saves a lot of pesticides. However, plastic greenhouses also have a small disadvantage. When it is too hot in summer, you have to open the sunshade net, otherwise the vegetables will be "roasted".
Now even desert areas are using plastic greenhouses to grow vegetables! The last time I watched a documentary, farmers in Dubai built a series of greenhouses in the desert, and the water consumption was only one-tenth of that of open-air planting. This technology allows arid areas to eat fresh vegetables. It is really technology that changes life. Next time you buy vegetables, pay attention to the "greenhouse planting" label on the package. Maybe you are eating these "greenhouse treasures"!
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