Is sorghum a promising summer catch crop for reducing nitrate accumulation and enhancing eggplant yield in intensive greenhouse vegetable systems?

文献类型： 外文期刊

第一作者： Ma, Yan

作者： Ma, Yan;Kang, Lingyun;Li, Yanqing;Zhang, Xinjun;Chen, Qing;Kang, Lingyun;Cardenas, Laura M.

作者机构：

关键词： Catch crop; Biological nitrification inhibition; Sweet corn; Residues; Ammonia-oxidizing archaea; Ammonia-oxidizing bacteria

期刊名称：PLANT AND SOIL （ 影响因子：4.9； 五年影响因子：5.2 ）

ISSN： 0032-079X

年卷期： 2023 年

页码：

收录情况： SCI

摘要： PurposeSummer catch crop (CC) has been introduced into the vegetable rotating system in greenhouse fields to reduce nitrogen (N) losses through crop uptake and residual N immobilization. However, the effects of planting sorghum with high N uptake and biomass, and biological nitrification inhibition (BNI) potential as a CC on soil N dynamics and subsequent crop yield remain unclear.MethodsIn the two-year field experiment, the comprehensive effects of planting sorghum as CC on subsequent eggplant yield, soil mineral N dynamics, ammonia-oxidizing archaea (AOA) and bacteria (AOB) amoA gene abundances were determined, in comparison to the sweet corn and fallow treatments.ResultsCompared to the fallow and sweet corn, planting sorghum as CC increased subsequent eggplant yield by 24.88% and 18.94% in the 2014-2015 and 2015-2016 over-winter growing season, respectively. CC planting reduced soil nitrate (NO3--N) accumulation during the summer fallow season. Sorghum planting could significantly maintain higher level of ammonium (NH4+-N) concentration during the summer fallow season and the first month of succeeding over-winter season. In addition, sorghum planting reduced soil net nitrifying potential, which could be partially attributed to the decreased amoA gene abundance of AOA at the 0-30 and 30-60 cm soil layers and AOB at 0-30 cm soil layer.ConclusionWe conclude that planting sorghum in the summer fallow season is a promising strategy to retain soil NH4+-N, reduce soil NO3--N accumulation, and enhance subsequent eggplant yield.

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