Rhizodeposition: An Unseen Teaser of Nature and Its Prospects in Nutrients Dynamics

Patra, Abhik; Sharma, Vinod; Chattopadhyay, Arghya; Mohapatra, Kiran Kumar; Rakshit, Amitava

doi:10.1007/978-981-16-0917-6_6

Cited by 1 publication

(1 citation statement)

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“…Additionally, the rhizodeposition patterns within the plant‐amendment combination are expected to significantly differ from those observed in unamended plants (Patra et al, 2021). This divergence, coupled with the documented increase in root growth by Wang et al (2020), suggests that the alterations in bacterial abundance—both positive and negative—will be notably unique compared to those attributed solely to the growth of unamended plants.…”

Section: Discussionmentioning

confidence: 99%

Bacterial community shifts occur primarily through rhizosphere expansion in response to subsoil amendments

Vido,

Wang,

Sale

et al. 2024

Environmental Microbiology

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To comprehensively evaluate the impact of agricultural management practices on soil productivity, it is imperative to conduct a thorough analysis of soil bacterial ecology. Deep‐banding nutrient‐rich amendments is a soil management practice that aims to improve plant growth and soil structure by addressing the plant‐growth constraints posed by dense‐clay subsoils. However, the response of bacterial communities to deep‐banded amendments has not been thoroughly studied. To address this knowledge gap, we conducted a controlled‐environment column experiment to examine the effects of different types of soil amendments (poultry litter, wheat straw + chemical fertiliser and chemical fertiliser alone) on bacterial taxonomic composition in simulated dense‐clay subsoils. We evaluated the bacterial taxonomic and ecological group composition in soils beside and below the amendment using 16S rRNA amplicon sequencing and robust statistical methods. Our results indicate that deep‐banded amendments alter bacterial communities through direct and indirect mechanisms. All amendments directly facilitated a shift in bacterial communities in the absence of growing wheat. However, a combination of amendments with growing wheat led to a more pronounced bacterial community shift which was distinct from and eclipsed the direct impact of the amendments and plants alone. This indirect mechanism was evidenced to be mediated primarily by plant growth and hypothesised to result from an enhancement in wheat root distribution, density and rhizodeposition changes. Therefore, we propose that subsoil amendments regardless of type facilitated an expansion in the rhizosphere which engineered a substantial plant‐mediated bacterial community response within the simulated dense‐clay subsoils. Overall, our findings highlight the importance of considering the complex and synergistic interactions between soil physicochemical properties, plant growth and bacterial communities when assessing agricultural management strategies for improving soil and plant productivity.

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Section: Discussionmentioning

confidence: 99%