Effects of Humic Materials on Soil N Transformation and NH3 Loss when Co-applied with 3, 4-Dimethylpyrazole Phosphate and Urea

文献类型： 外文期刊

第一作者： Liu, Zhihua

作者： Liu, Zhihua;Jiang, Zhenfeng;Gao, Jichao;Gao, Jichao;Shi, Yuanliang;Xu, Lingying;Shen, Yazhen;Yang, Ruizhe;Li, Jinbo

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关键词： Source of humic materials; Nitrification inhibitor DMPP; Soil N mineralization and inhibition; Ammonia volatilization; Alkaline soils

期刊名称：JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION （ 影响因子：3.61； 五年影响因子：3.581 ）

ISSN： 0718-9508

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收录情况： SCI

摘要： The nitrification inhibitor (NI) 3, 4-dimethylpyrazole phosphate (DMPP) is widely used to reduce NO3- production rates, but it also causes a high NH3 emission risk. To address this issue, we co-applied different humic materials extracted from lignite (B) and pine (Y) with DMPP and evaluated their combined effects on soil N mineralization, nitrification inhibition, and NH3 losses with incubation experiments. The treatments included urea only (U), urea with DMPP (UD), urea with different humic materials (UB2 and UY2), and urea with DMPP and humic materials, and the application rates ranged from 0.25 to 1.0 g C kg(-1) soil. The Y material had a lower C/H ratio and higher C/N, O/C, and Delta 1gK values than the B material. Regardless of the source, addition of humic material significantly increased the final soil NH4+ concentration but had little effect on the soil NO3- concentration. Humic materials also decreased cumulative NH3 volatilization when co-applied with DMPP. The effects on soil NH4+ concentrations increased with increasing Y addition but decreased with increasing B addition, and humic materials derived from different sources had opposite effects on the nitrification inhibition efficiency of DMPP. N-0, N-R, and K-D values increased and N-D decreased with increasing Y addition during co-application with DMPP, but cumulative NH3 volatilization did not differ significantly with increased B addition. Humic materials have positive effects on nitrification inhibition efficiency and NH3 reduction when co-applied with DMPP, but their efficiencies depend on the sources used.

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