Nitrogen dynamics affected by biochar and irrigation level in an onion field

文献类型： 外文期刊

第一作者： Gao, Suduan

作者： Gao, Suduan;Wang, Dong;Dangi, Sadikshya R.;Pflaum, Tom;Gartung, Jim;Duan, Yinghua;Qin, Ruijun;Turini, Thomas

作者机构：

关键词： Ammonia volatilization; Nitrous oxide emission; Soil porewater N; Nitrate leaching; Drip irrigation

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

ISSN： 0048-9697

年卷期： 2020 年 714 卷

页码：

收录情况： SCI

摘要： Soil amended with biochar has many potential environmental benefits, but its influence on the fate of nitrogen (N) under irrigated conditions is unclear. The objective of this research was to determine the effects of biochar and interactions with irrigation on N movement in soil, gas emissions, and leaching. A three-year study was conducted in an onion field with three main irrigation treatments (50, 75, and 100% of a reference that provided sufficient water for plant growth) and three biochar amendment rates (0 or control, low char - applied first year at 29 Mg ha(-1), and high char - added both first and second year fora total 58 Mg ha(-1)) as sub-treatments in a split-plot design. Nitrogen fertilizer was applied three times during first year growing season, but weekly the second year. Ammonia (NH3) volatilization, nitrous oxide (N2O) emission, and nitrate (NO3-) in soil pore water were monitored during growing season, and annual N (total and NO3-) changes in soil profile were determined for first two years. Nitrate leaching was measured in the third year. Ammonia volatilization was affected by fertilization frequency with higher loss (5-8% of total applied) when fertilizer was applied in large doses during the first year compared to the second year (4-5%). Nitrous oxide emissions were <= 0.1% of applied N for both years and not affected by any treatments or fertilization frequency. Nitrate concentration in soil profile increased significantly as irrigation level dropped, but most of the NO3- was leached by winter rain. There was no significant biochar effect on total N gas emissions or soil NO3- accumulation, but significant irrigation effect and interaction with biochar were determined on soil NO3- accumulation. High leaching was associated with biochar amendment and higher irrigation level. Irrigation strategies are the key to improving N management and developing the best practices associated with biochar. Published by Elsevier B.V.

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