中文摘要：

以7个不同甘薯品种为试验材料，采用随机区组设计，研究其在套作玉米下的群体产量优势和经济效益。结果表明：套作模式下，甘薯产量较净作降低，不同甘薯品种间的单株薯数、单株薯重、产量差异显著，套作南薯88、徐薯22和渝薯2号甘薯所得产量及淀粉产量均较高；7个不同甘薯品种套作玉米种植下的复合群体土地当量比均大于1，均存在套作优势；以净作和套作宁4—6、济黑薯1号和E08101等特用型甘薯所得产值较高。

英文摘要：

Seven different varieties of sweet potato were used to study their population yield advantage and economic benefit when they intercropped with maize through using randomized block design. The results showed that the yield of sweet potato under this intercropping mode was lower than that under monocropping mode. Under sweet potato - maize intercropping mode, there was a significant difference in the number of tubers per plant, tuber weight per plant, and tuber yield among different varieties of sweet po- tato. The tuber yield and starch yield of sweet potato were higher when maize intercropped with Nanshu 88, Xushu 22 and Yushu 2. When 7 sweet potato varieties intercropped with maize, the land equivalent ratios of complex populations were all more than 1, revealing that the intercropping advantage existed. The monocropping or intercropping of special sweet potato varieties （ Ning 4 - 6, Jiheishu 1, E08101 and so on） with maize obtained a higher output value.