Effects of urea enhanced with different weathered coal-derived humic acid components on maize yield and fate of fertilizer nitrogen

文献类型： 外文期刊

第一作者： Zhang Shui-qin

作者： Zhang Shui-qin;Yuan Liang;Li Wei;Lin Zhi-an;Li Yan-ting;Zhao Bing-qiang;Zhang Shui-qin;Hu Shu-wen

作者机构： Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Minist Agr, Key Lab Plant Nutr & Fertilizer, Beijing 100081, Peoples R China;China Agr Univ, Coll Resources & Environm Sci, Beijing 100193, Peoples R China

关键词： humic acid enhanced urea; maize; aboveground dry biomass; fertilizer N uptake; fertilizer N residue

期刊名称：JOURNAL OF INTEGRATIVE AGRICULTURE （ 2020影响因子：2.848； 五年影响因子：2.979 ）

ISSN： 2095-3119

年卷期： 2019 年 18 卷 3 期

页码：

收录情况： SCI

摘要： Humic acid (HA) is a readily available and low-cost material that is used to enhance crop production and reduce nitrogen (N) loss. However, there is little consensus on the efficacy of different HA components. In the current study, a soil column experiment was conducted using the N-15 tracer technique in Dezhou City, Shandong Province, China, to compare the effects of urea with and without the addition of weathered coal-derived HA components on maize yield and the fate of fertilizer-derived N (fertilizer N). The HA components were incorporated into urea by blending different HA components into molten urea to obtain the three different types of HA-enhanced urea (HAU). At harvest, the aboveground dry biomass of plants grown with HAU was enhanced by 11.50-21.33% when compared to that of plants grown with U. More significantly, the grain yields under the HAU treatments were 5.58-18.67% higher than the yield under the urea treatment. These higher yields were due to an increase in the number of kernels per plant rather than the weight of individual kernels. The uptake of fertilizer N under the HAU treatments was also higher than that under the urea treatment by 11.49-29.46%, while the unaccounted N loss decreased by 12.37-30.05%. More fertilizer-derived N was retained in the 0-30 cm soil layer under the HAU treatments than that under the urea treatment, while less N was retained in the 30-90 cm soil layer. The total residual amount of fertilizer N in the soil column, however, did not differ significantly between the treatments. Of the three HAU treatments investigated, the one with an HA fraction derived from extraction with pH values ranging from 6 to 7, resulted in the best improvement in all assessment targets. This is likely due to the abundance of the COO/C-N=O group in this HA component.

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