Effects of Applying Potassium at Different Stages on Yield and Quality of Edible Sweetpotato

doi:10.7668/hbnxb.2014.S1.068

Abstract

Abstract: In order to ascertain the appropriate potassium fertilization level and fertilization period,the field experiments were done to improve the yield and quality of sweetpotato,and its efficient utilization and optimization management at the same time.The effects of three K levels (0,150,300 kg/ha) and three fertilization periods (the early stage of growth period within 2 weeks after planting,sealing ridge stage and the early stage of storage root enlargement) treatment on sweetpotato yield and nutritional composition application on yield and nutritional compositions were studied using edible sweetpotato variety Xushu 32 as experimental material.The results showed that the maximum fresh(36 495.0 kg/ha) and dry(12 175.5 kg/ha) yield were observed under early application of K 300 kg/ha.The impact of K fertilization level and fertilization period on measured quality traits was obvious.Fertilizer application at early stage of growth period was beneficial to starch,maltose and sucrose accumulation.Low potassium level treatment contributed to starch and carbohydrate accumulation,high potassium level treatment contributed to protein accumulation.

Key words: Sweetpotato, Potassium fertilizer, Fertilization level, Fertilization period, Yield, Quality

CLC Number:

S143.3

KOU Meng, ZHANG Yun-gang, LIU Ya-ju, WANG Xin, TANG Wei, YAN Hui, MA Dai-fu, LI Qiang. Effects of Applying Potassium at Different Stages on Yield and Quality of Edible Sweetpotato[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2014, 29(S1): 368-372. doi: 10.7668/hbnxb.2014.S1.068.

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