In order to study the effect of uniconazole on the growth characteristics and yield of fresh sweet potato,four comparative experiments with different concentrations were carried out using Xinxiang as the test material.The results showed that the ratio of fresh weight between the aboveground and underground parts of all treatments treated with uniconazole was lower than that of the control,and the yield and chlorophyll content of fresh potatoes were higher than those of the control.The results indicated that the spraying of uniconazole could relatively delay the growth of the aboveground,reduce the energy consumption of the aboveground,and improve the photosynthetic efficiency,so as to achieve the purpose of increasing yield.In this experiment,spraying 75 mg·L-1 uniconazole is the best,its yield of 667 m2 fresh sweet potatoes was 2 528.46 kg,which was 13.35%higher than that of the control.
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