Deposition and Transformation of Nitrogen after Soil Fumigation with Ethanedinitrile

文献类型： 外文期刊

第一作者： Stevens, Mary C.

作者： Stevens, Mary C.;Yang, Rui;Freeman, Joshua H.

作者机构：

关键词： methyl bromide alternatives; ammonium; nitrate

期刊名称：HORTSCIENCE （ 影响因子：1.455； 五年影响因子：1.617 ）

ISSN： 0018-5345

年卷期： 2020 年 55 卷 12 期

页码：

收录情况： SCI

摘要： A novel methyl bromide alternative, ethanedinitrile (EDN), has been reported to be efficacious against soil-borne pathogens, weeds, and plant-parasitic nematodes. Degradation products of EDN include NH4+ and NH3, but it is currently unknown at what quantities these degradation products are being released into the soil at a given use rate of EDN. To address this issue, field studies were performed using the raised-bed plasticulture system. Deposition of NH4+ and NO3- in top 0-15-, 15-30-, and 30-45-cm soils were evaluated 3 weeks after fumigation with EDN applied at 336, 448, and 560 kg.ha(-1). Change of pH and transformation of NH4+ to NO3- in top 0-15- and 15-30-cm soils were tracked weekly after fumigation with EDN at 448 kg.ha(-1) for 10 weeks. This study found that fumigation with EDN significantly increased soil pH of the top 0-15-cm soil and soil NH4+ in top 0-15- and 15-30-cm soils, but soil NO3- was unaffected. Nitrification process in top 0-15-cm soil was inhibited by fumigation with EDN for at least 7 weeks. These results indicate that N deposited by fumigation with EDN could be an important preplant N source for crop production, and the inhibition of nitrification could help mitigate nitrate leaching. This study provides helpful information for quantification of N deposited from fumigation with EDN.

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