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本文以甘薯品种徐薯１８为材料，分析其茎蔓和块生长率与叶片叶绿素含量、光合作用强度、吸收根系和块根的ＴＴＣ还原强度、可溶性蛋白质含量、α和β淀粉酶活力、淀粉磷酸化酶活力等在不同生育期的动态变化。结果表明，幼薯分化的生理准备始于扦插后第四周、茎蔓的生长与叶面积的增加并不是平行的，生育期中叶绿素含量除了在阴雨时期明显升高久，一般相对稳定，而叶绿素ａ／ｂ比例呈持续升高趋势；光合作用最强的叶片是茎蔓顶端第４平展叶；块根膨大速率最高的时期是扦插后４０－６０天，２０天内薯重净增长６倍，这与该阶段薯块中淀粉酶活力低有关。
In this paper, the sweet potato variety Xushu 18 was used as the material to analyze its growth rate and chlorophyll content, photosynthesis intensity, TTC reduction intensity, soluble protein content, α and β amylase activity, starch phosphorylation Enzyme activity in different growth stages of the dynamic changes. The results showed that the physiological preparation of sweet potato differentiation began in the fourth week after cuttings, the growth of stems and leaves was not parallel to the increase of leaf area, and the chlorophyll content in growth period obviously increased for a long time in cloudy and rainy periods, but the chlorophyll a / B ratio showed a continuous upward trend; strongest leaf photosynthesis is the top of the stalk flat top 4 leaves; the highest rate of tuberous root swollen 40-60 days after cutting the potato within 20 days net increase of 6 times, Stage potato block amylase activity is low.