The use of humic acid urea fertilizer for increasing yield and utilization of nitrogen in sweet potato

Xiaoguang Chen, Meng Kou, Zhonghou Tang, Aijun Zhang and Hongmin Li
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Meng Kou: Xuzhou Sweet Potato Research Center/Xuzhou Institute of Agricultural Sciences of the Xuhuai District of Jiangsu Province, Xuzhou, P.R. China
Zhonghou Tang: Xuzhou Sweet Potato Research Center/Xuzhou Institute of Agricultural Sciences of the Xuhuai District of Jiangsu Province, Xuzhou, P.R. China
Aijun Zhang: Xuzhou Sweet Potato Research Center/Xuzhou Institute of Agricultural Sciences of the Xuhuai District of Jiangsu Province, Xuzhou, P.R. China
Hongmin Li: Xuzhou Sweet Potato Research Center/Xuzhou Institute of Agricultural Sciences of the Xuhuai District of Jiangsu Province, Xuzhou, P.R. China

Plant, Soil and Environment, 2017, vol. 63, issue 5, 201-206

Abstract: Humic acid urea fertilizer (HA-N) is a new type of slow-release nitrogenous fertilizer that can enhance utilization rate of urea, and consequently increases crop yield. However, there were few researches about the effect of HA-N on the nitrogen absorption and utilization in sweet potato production. Hence, the effect of HA-N on nitrogen accumulation and distribution, nitrogen use efficiency (NUE), and yield of sweet potato was studied in the field using the 15N tracer technique. Results showed that HA-N significantly increased the number of storage roots per plant and the average fresh weight per storage root, as well as the yield increased by 29.6% compared with urea fertilizer. Furthermore, nitrogen accumulation of total plant was higher under the HA-N. In addition, HA-N significantly increased nitrogen production efficiency of fertilizer and nitrogen production efficiency. Results of a 15N tracer experiment revealed that the percentage of nitrogen absorbed by plant from fertilizer increased from 31.1% to 38.7% and NUE increased from 33.5% to 44.8% with application of HA-N when compared with single N treatment, respectively. HA-N significantly increased sweet potato storage root yield, nitrogen absorption and NUE, as well as it reduced the loss of nitrogen fertilizer.

Keywords: nitrogen absorption and distribution; nitrogen balance; macronutrient; isotope; Ipomoea batatas [L.] Lam (search for similar items in EconPapers)
Date: 2017
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:63:y:2017:i:5:id:24-2017-pse

DOI: 10.17221/24/2017-PSE

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