Mulching crops with plastic film can promote earlier maturity, increase yield, and improve quality. However, in actual farming practices, most mulch films are discarded due to improper usage. To enhance the reuse rate of plastic film and reduce production costs, it is highly recommended to use the same film multiple times. Here are some effective methods for repeated use:
One common practice is the wheat and melon rotation system. This involves covering wheat with a new layer of plastic film at the end of winter, then removing the film in mid-March of the following year and using it to cover watermelons in early April.
Another approach is the repeated use of plastic film with wheat and vegetables. From late November to mid-March of the next year, wheat is first planted under the film, followed by spring vegetables. After about 10 days, summer vegetables like cucumbers or tomatoes are planted. In some cases, autumn vegetables can also be grown. If handled carefully, the same plastic film can be reused up to four times.
Common crop rotation patterns include:
1. Winter wheat – Cabbage – Cucumber (or tomatoes)
2. Winter wheat – Bamboo shoots – Tomato (or cucumber)
3. Winter wheat – Fennel – Sweet pepper
4. Winter radish – Radish – Cabbage – Bean
5. Overwintering garlic – Green onion – Cowpea – Tomatoes
6. Winter spinach – Carrot – Fennel – Tomatoes
In these systems, fast-growing vegetables such as radishes and fennel can be used flexibly to adjust planting schedules. Additionally, fruit-bearing crops and vegetables can be interchanged depending on the season. The key is to remove the plastic film properly and change the crops accordingly.
For example, after planting cabbage under the film, sweet peppers can be planted later. In the fall, bamboo shoots or beans can be grown, and in the autumn, cucumbers can follow. Some farmers first install the film and then build a small arch over it. They start by covering wheat with plastic, then remove it and use the same film to create a small greenhouse for growing kidney beans. This method can also be applied in greenhouses, where the plastic is removed after harvesting and used again for tomato or other vegetable cultivation.
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