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为了省工、省力,又能应对-37℃的极端最低气温和长期低温,对降雪晚而少的干冷年份和早而多的湿冷年份,进行了白塑料和黑塑料薄膜双层和单层覆盖的比较。结果表明:采用双层覆盖比单层优越。在积雪深度不足9cm,最低气温-22℃时,双层覆盖下的最低温度是-9.9℃,而单层覆盖则是-16.0℃,出现了减产,果穗变得小而轻、新枝条短等生产性能不良的影响。在塑膜覆盖中,采用白塑料薄膜较黑塑料薄膜优越。在干冷年份,黑塑膜上不容易保留雪被,单层覆盖-16℃时,而白塑膜因为有雪被覆盖,则是-13.2℃,而且白塑料薄膜价格比黑塑料薄膜便宜近一半。
In order to save labor and effort, but also cope with extreme minimum temperature of -37 ℃ and long-term low temperature, the white plastic and black plastic film double layer and single layer coverage Comparison. The results show that the use of double-layer coverage is superior to single-layer. When the snow depth is less than 9cm and the minimum temperature is -22 ℃, the minimum temperature under double-layer coverage is -9.9 ℃, while the single-layer coverage is -16.0 ℃, and the yield reduction occurs. The ears become small and light, and the new shoots are short Other adverse effects of production performance. Plastic film coverage, the use of white plastic film is superior to black plastic film. In dry and cold years, it is not easy to retain snow cover on black plastic film, single layer covers -16 ℃, while white plastic film is covered with snow, it is -13.2 ℃, and white plastic film is cheaper than black plastic film by nearly half .