Effects of Nitrogen Fertilizer Application Amount on Growth, Nitrogen Content and Yield of Sweetpotato
YANG Yufeng
ZHANG Xiaoshen
WANG Huiyu
DUAN Junzhi
LI Junxia
DAI Xiaodong
YANG Guohong
Abstract：In this paper, the dual-purpose sweetpotato variety Zhenghong 22 was used as the experimen-tal material to study the influence of different application amount of nitrogen fertilizer on growth, nitrogen content and yield of sweetpotato. The results showed that aboveground fresh weight increased with the in-crease of nitrogen application amount and the growth period. Underground fresh weight increased with growth period, while increased at first and then decreased with the increase of nitrogen application amount. The ratio of aboveground fresh weight and underground fresh weight decreased with the growth period,while increased at first and then decreased with the increase of nitrogen application amount. Both the nitrogen content of aboveground dry matter and underground dry matter decreased with the growth pe-riod,while increased at first and then decreased with the increase of nitrogen application amount. Overall, the ratio of the nitrogen content of aboveground dry matter and underground dry matter increased with the increase of nitrogen application amount and the growth period. The yield of fresh sweetpotato increased at first and then decreased with the increase of nitrogen application amount,and the treatment with nitrogen fertilizer of 75 kg/ha had the highest fresh sweetpotato yield of 43 819. 44 kg/ha. The results of correla-tion analysis indicated that the aboveground fresh weight had a significant positive correlation with the ni-trogen content of aboveground dry matter, and both the underground fresh weight and the nitrogen content of underground dry matter were significantly positively correlated with the fresh sweetpotato yield, the ra-tio of aboveground fresh weight and underground fresh weight were significantly negatively correlated with the nitrogen content of underground dry matter.
Keywords：sweetpotatonitrogen fertilizernitrogen contentyield
Publication Date：2015-03-02
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：4( 52-55 )