为了探索紫色甘薯高产栽培技术,以不覆膜为对照,研究了黑膜和白膜对绵渝紫11鲜薯产量、大中薯率和经济效益的影响.结果表明,覆膜能显著提高紫色甘薯的鲜薯产量,覆黑膜和白膜比不覆膜分别增产14.64℅和7.81℅,其中覆黑膜增产极显著;覆膜后紫色甘薯的大中薯率分别提高15.54个百分点和14.72个百分点;覆膜还能提高紫色甘薯种植的经济效益,增加投入产出比,覆盖黑膜,紫色甘薯净收益增加11643.90元/hm2,收益增加52.73℅;覆盖白膜,紫色甘薯净收益增加8799.80元/hm2,收益增加39.85℅.覆膜后,增产增收效果非常显著,其中以覆盖黑膜效果最佳,在紫色甘薯种植中,推荐黑色地膜覆盖栽培技术.%In order to explore the high-yield cultural technology of purple sweet potato, black plastic film and white plastic film were used to study the effect of plastic mulching on fresh yield, rate of large and medium-sized tuber and economic benefit of purple sweet potato variety Mianyuzi 11. The results showed that plastic mulching could significantly increase the fresh yield of purple sweet potato. Compared to no plastic mulching, black plastic mulching and white plastic mulching in-creased the fresh yield by 14.64℅ and 7.81℅ and increased the rate of large and medium-sized tuber by 15.54℅ and 14.72℅, respectively. Plastic mulching could also improve the economic benefit of purple sweet potato and increase the in-put-output ratio. The net income increased 11 643.90 yuan/hm2by black plastic film mulching, with an increase of 52.73℅. The net income increased 8 799.80 yuan/hm2by white plastic film mulching, with an increase of 39.85℅. The effect of in-creasing fresh yield and economic benefit by plastic mulching was very significant, especially by black plastic film mulching. Therefore we recommend the black plastic film mulching in purple sweet potato planting.
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