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Humic acid-modified bentonite composite material enhances urea nitrogen use efficiency

文献类型： 外文期刊

作者： Shen, Yuwen 1 ; Jiao, Shuying 3 ; Ma, Zheng 1 ; Lin, Haitao 1 ; Gao, Wensheng 4 ; Chen, Jianqiu 2 ;

作者机构： 1.Shandong Acad Agr Sci, Inst Agr Resources & Environm, Minist Agr,Key Lab Wastes Matrix Utilizat, Shandong Prov Engn Res Ctr Environm Protect Ferti, Jinan 250100, Peoples R China

2.State Key Lab Nutr Resources Integrated Utilizat, Linshu 276700, Peoples R China

3.Shandong Agr Univ, Coll Resources & Environm, Tai An 271018, Shandong, Peoples R China

4.Shandong Agr Dept, Fruit & Tea Tech Extens Stn, Jinan 250013, Peoples R China

关键词： Humic acid; Bentonite; Urea; Nitrogen use efficiency

期刊名称：CHEMOSPHERE （ 影响因子：7.086； 五年影响因子：6.956 ）

ISSN： 0045-6535

年卷期： 2020 年 255 卷

页码：

收录情况： SCI

摘要： Bentonite was modified by introducing humic acid (HA) into interlayer space of bentonite. The structural and physicochemical properties of modified bentonite were determined by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), X-ray powder diffraction (XRD) and thermogravimetric analysis (TGA). The results showed that HA could enter the bentonite interlayer and increase the interlayer distance. Moreover, we were also investigated the high adsorption capacity and thermodynamics of modified bentonite to NH4+ cations in solutions. Under the same conditions, the NH4+ adsorption efficiency of modified bentonite (96.4%) was 69.2% higher compared with the natural bentonite (57.0%). The pseudo-second order kinetic model well fit the adsorption kinetics of NH4+ on modified bentonite, indicating that the adsorption type was chemical adsorption or chemisorptions. The isotherms fit well with Langmuir model, and the separation factor revealed that NH4+ on modified bentonite belonged to favorable adsorption. Compared with the natural bentonite, the modified bentonite exhibited a much lower leaching loss of NH4+-N and NO3--N in soil. Meanwhile, the loss of nitrogen caused by NH3 volatilization and N2O emission from soil could also be significantly attenuated by the combined application of modified bentonite and urea. The slower nitrogen release in the treatment combining modified bentonite and urea resulted in a greater yield and nitrogen uptake of wheat. Collectively, the modified bentonite could be used as nitrogen fertilizer synergist to enhance the nitrogen use efficiency. (C) 2020 Elsevier Ltd. All rights reserved.

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