Effects of Nitrogen Application on Yield,Quality and Nitrogen Utilization of Fresh-eating Sweet Potato

doi:10.7668/hbnxb.2014.06.032

Abstract

Abstract: To investigate the effects of nitrogen application on yield,quality and nitrogen utilization of sweet potato to provide a theoretical reference for the sweet potato nitrogen management.The effects of nitrogen application on biological index,yield,quality and nitrogen utilization have been studied in the pot experiment.The cultivar of fresh-eating sweet potatos(Longshu 9 and Yanshu 25) were selected as experimental materials.The results showed that the biological index such as vine length,branch number,length of internode,petiole length and so on were increased with the increase of nitrogen application.Appropriate nitrogen application could significantly increase the tuber yield,commodity rate and tuber number of per plant,and increase the tuber soluble sugar and Vc content.The tuber soluble protein,crude protein and nitrate content increased with the increase of nitrogen application.Simulated by a quadratic curve:the yields of fresh-eating sweet potato reach their maxima under 166.60 mg/kg (Longshu 9) and 153.13 mg/kg(Yanshu 25).The nitrogen accumulation increased with the increase of nitrogen application,nitrogen uptake efficiency and nitrogen use efficiency decreased with the increase of nitrogen application,the difference of cultivars on nitrogen uptake efficiency showed that short vine cultivar (Longshu 9) less than long vine cultivar (Yanshu 25),but the difference of cultivars on nitrogen use efficiency showed that short vine cultivar (Longshu 9) more than long vine cultivar (Yanshu 25).Reduce nitrogen application could increase the nitrogen use efficiency of fresh-eating sweet potato significantly.

Key words: Nitrogen, Fresh-eating sweet potato, Yield, Quality, Nitrogen utilization

CLC Number:

S143.1
S531

GAO Lu-yang, FANG Zeng-guo, SHI Yan-xi. Effects of Nitrogen Application on Yield,Quality and Nitrogen Utilization of Fresh-eating Sweet Potato[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2014, 29(6): 189-194. doi: 10.7668/hbnxb.2014.06.032.

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