Soil–plant–microbe interactions in the rhizosphere: incremental amplification induced by localized fertilization

doi:10.15302/J-FASE-2024575

Liyang WANG^1,², Dan LIAO^1,², Zed RENGEL^3,⁴, Jianbo SHEN²(

)

¹. Inner Mongolia Key Laboratory of Soil Quality and Nutrient Resources, Key Laboratory of Agricultural Ecological Security and Green Development at Universities of Inner Mongolia Autonomous Region, College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot 010018, China
². State Key Laboratory of Nutrient Use and Management, Key Laboratory of Plant–Soil Interactions (Ministry of Education), Department of Plant Nutrition, College of Resources and Environmental Sciences, National Academy of Agriculture Green Development, China Agricultural University, Beijing 100193, China
³. Soil Science & Plant Nutrition, UWA School of Agriculture and Environment, The University of Western Australia, Perth, WA 6009, Australia
⁴. Institute for Adriatic Crops and Karst Reclamation, Split 21000, Croatia

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Abstract

● Plants can respond to heterogeneously distributed nutrient resources by enhancing root foraging capacity.

● Incremental amplification of root foraging for nutrients induced by localized fertilization was proposed.

● Incremental effects from the roots/rhizosphere to the plant-soil system conserve resources and reduce the environmental footprint of agricultural production.

Localized fertilization strategies (banding fertilizers) developed to minimize nutrient fixation by soil are used widely in intensive agricultural production. Localized fertilization encourages root foraging for heterogeneously distributed soil nutrients. This review focuses on the advances in root growth and nutrient acquisition of heterogeneously distributed soil resources. It is proposed that the incremental amplification of root foraging for nutrients induced by localized fertilization: (1) increased absorption area due to altered root morphology, (2) enhanced mobilization capacity underpinned by enhanced root physiological processes, and (3) intensified belowground interactions due to selective stimulation of soil microorganisms. The increase in root proliferation and the nutrient mobilization capacity as well as microbiome changes caused by localized fertilization can be amplified stepwise to synergistically enhance root foraging capacity, nutrient use efficiency and improve crop productivity. Engineering the roots/rhizosphere through localized, tailored nutrient application to stimulate nature-based root foraging for heterogeneously distributed soil nutrients, and scaling up of the root foraging capacity and nutrient acquisition efficiency from the rhizosphere to the field offers a potential pathway for green and sustainable intensification of agriculture.

Keywords Incremental amplification localized fertilization root/rhizosphere engineering high nutrient-use efficiency

Corresponding Author(s): Jianbo SHEN

About author:

^#These authors contributed equally to this work.

Just Accepted Date: 17 July 2024 Online First Date: 13 August 2024

Cite this article:

Jianbo SHEN,Zed RENGEL,Dan LIAO, et al. Soil–plant–microbe interactions in the rhizosphere: incremental amplification induced by localized fertilization[J]. Front. Agr. Sci. Eng. , 13 August 2024. [Epub ahead of print] doi: 10.15302/J-FASE-2024575.

URL:

https://academic.hep.com.cn/fase/EN/10.15302/J-FASE-2024575
https://academic.hep.com.cn/fase/EN/Y/V/I/0

Fig.1 Heterogeneous soil environment and root responses. (a) Heterogeneous soil structure and nutrient distribution in natural ecosystem. (b) Fertilizer-enriched patches created by localized fertilization in cropland ecosystems. (c) Root proliferation in nutrient-enriched middle section in a rhizobox.

Fig.2 Incremental amplification effect induced by localized fertilization for improving nutrient use efficiency. Localized fertilization promotes nutrient acquisition by plants mainly through the three inter-related processes: (1) increased absorption area as a consequence of altered root morphology, (2) enhanced mobilization capacity due to enhanced root physiological processes, and (3) intensified belowground interactions by stimulating microbiota. The increase in root proliferation and nutrient mobilization capacity as well as changes in the soil microbial community caused by localized fertilization can be incrementally amplified to synergistically enhance root foraging capacity and nutrient use efficiency, and thus improve crop productivity. The area of intensified rhizosphere processes and interactions is indicated in yellow.

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