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本试验以“秦薯１号”甘薯品种为材料，进行地膜甘薯产量性状的通径分析。１９９１—１９９３年试验结果表明，４个相关性状对产量影响的大小顺序为：亩株数＞单株重＞Ｔ／Ｒ值＞单株薯块数。在单薯重和Ｔ／Ｒ值不变的条件下，适度提高亩株数是增加产量的主要途径。在亩林数和单株薯块数相对稳定的情况下，提高单薯重及Ｔ／Ｒ值亦是增加产量的重要途径。在亩株数保持相对稳定的情况下，增加单株结薯数可有效提高产量，但作用较小。
In this experiment, “Qinhu 1” sweet potato varieties as the material, the yield characteristics of plastic film mulching path analysis. The results from 1991 to 1993 showed that the order of the four traits related to yield was as follows: mu number> single plant weight> T / R value> number of tubers per plant. Under the condition of single potato weight and constant T / R, increasing the number of mus plants moderately is the main way to increase the yield. In the case of relatively stable number of forest and individual potato block, raising single potato weight and T / R value is also an important way to increase yield. In the case of the number of acres remained relatively stable, increasing the number of tuber per plant can effectively improve the yield, but less effect.