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我们自1982年开始使用地膜覆盖进行甘薯育苗的试验结果表明:甘薯育苗盖地膜,能够增强光照提高地温、增加土壤保水保肥性能,有利于薯苗生长,有成苗早苗量多的优点。一、能增强苗床温湿度 (一)提高地温地膜覆盖后,其薄膜本身和膜下附着的细微水珠对光有一定的反射力,能够增加近地面空间的光量,使土壤温度升高3.26℃,并通过传导作用逐渐提高下层土壤的温度,同时由于地膜不透气性,土壤热量不易散失,汽化热也不易损失,从而增加了土壤热容量及导热性,有利于土壤温度的提高。 (二)保持土壤水分地膜覆盖苗床后,土壤
The results of experiment on sweet potato seedling using mulch cover since 1982 show that the sweet potato seedling cover film can enhance the light to increase the ground temperature and increase the soil water retention and fertilizer benefit, which is beneficial to the growth of potato seedlings and the seedling with more seedlings. First, to enhance the temperature and humidity seedbed (A) to improve the ground temperature Mulch, the film itself and the sub-membrane attached to the water droplets have some light reflection, can increase the amount of light near the ground space, so that the soil temperature 3.26 ℃ , And gradually increase the temperature of the lower soil through conduction. Meanwhile, due to the impermeability of the membrane, soil heat is not easily lost and the heat of vaporization is also hard to be lost, thereby increasing the soil heat capacity and thermal conductivity, which is in favor of increasing the soil temperature. (B) to maintain the soil moisture Mulch after the cover of the soil, soil