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Observations reveal the impact of continuous cropping on microbial composition in Andrographis, suggesting implications for cultivation practices.
We elucidated the correlations among continuous cropping problems of Andrographis, the autotoxins and microbes within its root-zone soil. Soil samples of were collected from different zones of Andrographis to assess the ‘autotoxic circle’ and to analyse the microbial community composition. Seedling growth inhibition by soil and soil extracts decreased with distance from the plant. The microbial constitution in the different Andrographis root-zone soils shifted dramatically within 15 cm of the plant characterized by the appearance of various exclusive species. However, beyond this range it was not affected.
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Zheng et al. (2018) studied this question.
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