First, in addition to the rainy season in pure dry fields, long-term drought under plastic mulch not only fails to achieve its intended purpose but also worsens the drought conditions. The plastic film can prevent moisture from reaching the soil, leading to a more severe dryness than before. This is especially problematic in areas where water is already scarce.
Second, when sandy land is covered with mulch, the ground temperature can become excessively high at noon, which can be harmful to crops, especially during dry periods. High temperatures can damage plant roots and reduce overall crop health, making it difficult for plants to thrive.
Third, on clay soils, the mulch is not easily blown away by wind, but this can lead to physical damage to the plastic film. As the soil expands and contracts due to moisture changes, the film may tear or break, reducing its effectiveness and requiring frequent replacement.
Fourth, in barren or nutrient-poor fields, the lack of fertilizers means that even with mulch, the soil cannot provide enough nutrients for the crops. As a result, the mulch does not contribute to increased yield or income, making the practice less beneficial for farmers.
Fifth, in many grassy fields, excessive weed growth remains a challenge. Although herbicides are often sprayed before planting, some weeds with underground rhizomes can still penetrate or lift the mulch film, reducing its effectiveness and requiring additional labor to maintain.
Overall, while plastic mulch has benefits in certain conditions, these challenges highlight the need for careful consideration of local environmental factors and proper management practices to ensure its success.
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