Challenges of continuous cropping in Rehmannia glutinosa: Mechanisms and mitigation measures

Tao Gan , Zhaofeng Yuan , Williamson Gustave , Tianyu Luan , Lizhi He , Zhemin Jia , Xinyu Zhao , Shuo Wang , Yun Deng , Xiaokai Zhang , Feng He
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Abstract

Rehmannia glutinosa is a widely cultivated medicinal herb, which faces significant challenges due to continuous cropping obstacles (CCO). After one year of cultivating in the same field, replanting is unsuccessful for the next 8–10 years due to the accumulation of allelochemicals, deterioration of soil properties, and disruptions in soil microbial communities. These factors severely impact plant growth, quality, and overall soil health. This review examines the causes and adverse effects of CCO in R. glutinosa cultivation and evaluates various strategies to mitigate them. CCO arise from complex interactions between the plant root system, soil properties, and microbial communities. A key contributor is the accumulation of phenolic acids in the rhizosphere, which alters soil physicochemical properties and promotes the proliferation of root pathogens, including fungi and root-knot nematodes. This creates a self-reinforcing cycle of soil degradation and plant stress, exacerbating CCO. Approaches such as variety selection, optimized crop rotation patterns, and the application of plant growth-promoting rhizobacteria are discussed in the article. Additionally, soil disinfection techniques, including fumigation, organic amendments, flooding, and mulching, are reviewed for their potential to suppress pathogens and restore soil health. The role of biochar, compost, and beneficial microorganisms, applied individually or in combination, to alleviate CCO and improve soil conditions are also highlighted. This review aims to provide a theoretical framework and practical guidance for overcoming CCO in R. glutinosa cultivation, contributing to sustainable agricultural practices for this important medicinal crop.

Abstract Image

地黄是一种广泛种植的药材,由于连作障碍(CCO),它面临着巨大的挑战。由于等位化学物质的积累、土壤性质的恶化和土壤微生物群落的破坏,在同一块地里种植一年后,接下来的 8-10 年里都无法成功移栽。这些因素严重影响了植物的生长、质量和整体土壤健康。本综述探讨了谷氨酰氨种植中 CCO 的成因和不利影响,并评估了各种缓解策略。CCO 源自植物根系、土壤特性和微生物群落之间复杂的相互作用。其中一个关键因素是根瘤菌圈中酚酸的积累,它会改变土壤理化性质,促进根部病原体(包括真菌和根结线虫)的增殖。这就形成了土壤退化和植物压力的自我强化循环,加剧了 CCO。文章讨论了品种选择、优化轮作模式和施用促进植物生长的根瘤菌等方法。此外,文章还评述了土壤消毒技术,包括熏蒸、有机添加剂、灌溉和覆盖,这些技术具有抑制病原体和恢复土壤健康的潜力。文章还强调了生物炭、堆肥和有益微生物单独或结合使用在缓解 CCO 和改善土壤条件方面的作用。本综述旨在为克服谷维素栽培中的 CCO 问题提供理论框架和实践指导,从而为这一重要药用作物的可持续农业实践做出贡献。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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