Effects of Nitrogen and Potassium on the Growth and Development of Sweet Potato

doi:10.14088/j.cnki.issn0439-8114.2018.22.008

Abstract

Abstract: Using the starch type sweet potato（Ipomoea batatas） variety Eshu No.9 as the experimental material,the field experiment was carried out. The experiment adopted two-factor crack zone design,which the main area was different nitrogen fertilizer level and the secondary area was different potassium fertilizer level,to research the effects of interaction of nitrogen and potassium on growth and development of sweet potato. The results showed that,when no nitrogen fertilizer was applied,the optimal dosage potassium （potassium sulphate） fertilizer was 180 kg/hm²,which was 7.2% higher than that without potash fertilizer;when the amount of nitrogen（urea） applied was 150 kg/hm²,the yield was the highest of which the amount of potassium fertilizer was 180 kg/hm²,and the yield was 23.02% higher than that without potassium fertilizer; when the amount of nitrogen applied was 300 kg/hm²,the yield of sweet potato was the highest of which the amount of potassium applied was 360 kg/hm²,and the yield was increased by 14.16% compared with that no potassium fertilizer was applied. It shows that no matter how much nitrogen fertilizer is applied,only when the potassium fertilizer is properly applied, the sweet potato can obtain high yield.

Key words: sweet potato[Ipomoea batatas（L.）Lam.], nitrogen fertilizer, potassium fertilizer, yield

CLC Number:

S531

CHAI Sha-sha, LEI Jian, WANG Lian-jun, SU Wen-jin, LIU Qiao-lin, SHEN Xing-guo, YANG Xin-sun. Effects of Nitrogen and Potassium on the Growth and Development of Sweet Potato[J]. HUBEI AGRICULTURAL SCIENCES, 2018, 57(22): 24-26.

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