几种生物可降解地膜甘薯应用对比试验

以多个由不同生产原料制备的、降解路径不完全相同的可降解地膜在甘薯上覆膜试验，通过测定覆膜后土壤及膜内外温湿度差异、PE基可降解地膜覆盖甘薯在前后期的拉伸强度变化、对甘薯产量及产品质量的影响，验证生物可降解地膜在皖北甘薯生产上的适用性。结果表明：几种可降解地膜能够达到与常规地膜相同的增温、保墒、抑制杂草的农艺效果；几种处理均较对照增产22％以上，在薯块膨大期遇连阴雨等较极端天气下，能够显著避减因未能及时揭膜所造成的幼嫩薯块腐烂；几种地膜能够有效适期降解，对下茬农事操作不产生影响。

Comparative experiment on Application of several biodegradable plastic film sweet potatoes

Several degradable plastic films prepared from different production raw materials with different degradation paths were used to cover sweet potato. By measuring the difference of temperature and humidity in soil and inside and outside the film, the change of tensile strength of sweet potato covered with PE based degradable plastic film before and after the period, and the impact on sweet potato yield and product quality, To verify the applicability of biodegradable plastic film in sweet potato production in Northern Anhui. The results showed that several degradable mulching films could achieve the same agronomic effects of increasing temperature, preserving moisture and inhibiting weeds as conventional mulching films; The yield of these treatments increased by more than 22% compared with the control. Under extreme weather such as continuous rain during potato expansion, it can significantly avoid the decay of young potato blocks caused by failure to peel the film in time; Several mulching films can be effectively degraded in an appropriate period, and have no effect on the next crop farming operation.