Silicon dynamics through the lens of soil-plant-animal interactions: perspectives for agricultural practices

Tombeur, Félix de; Roux, Philippe Le; Cornélis, Jean-Thomas

doi:10.1007/s11104-021-05076-8

Cited by 27 publications

(7 citation statements)

References 319 publications

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“…The fact that the addition of rice straw and biochar significantly increased soil Si_HOAc in the pot experiment is partially because the soil pH was also increased in these treatments (Figure 6). The adsorption of Si by soil increases with increasing pH until approximately pH 9.5, and thus, it is anticipated that the amount of soil Si_HOAc will be greater at higher pH values (de Tombeur, Roux, & Cornelis, 2021;Zheng et al, 2021). Contrary to our hypothesis, the biochar treatment in the rice growth pot experiment did not result in a significantly higher Si concentration in rice tissues or a greater Si uptake by rice than the rice straw treatment with the same Si addition rate (Figure 7).…”

Section: Si Uptake By Ricementioning

confidence: 61%

Section: Discussionmentioning

confidence: 99%

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Changes in soil silicon forms and availability as affected by rice straw and its biochar

Yao

Gao

et al. 2022

European J Soil Science

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Phytogenic silica (PhSi) is suggested to control silicon (Si) cycling in soil–plant systems in tropical and subtropical regions. However, the role of crop residues and its biochar as a source of available Si has not been well investigated in agricultural soils. In our study, we determined and compared the effects of rice straw and its biochar on soil Si forms and Si availability. Soil Si forms were characterised by a sequential extraction method, and soil Si availability was assessed by rice growth and soil Si extraction methods. A soil incubation experiment showed that the addition of rice straw and biochar increased plant‐available Si in soil (including mobile Si and adsorbed Si), as well as soil amorphous Si (especially in rice straw treatments). Moreover, this increase was more significant when higher Si (e.g., Si added at the rates of 1.6 and 2.0 g kg−1 soil) was added via rice straw and its biochar, which is most likely a result of PhSi dissolution. Rice‐straw biochar, particularly at higher Si addition rates, tended to have a higher efficiency in increasing soil Si availability than rice straw, mainly due to its greater proportion of readily labile Si. A rice growth pot experiment showed that it is difficult to determine the extent of Si dissolution from PhSi in rice straw using a short‐term experiment with a normal single‐season straw return rate, where the increased pH played a more crucial role in regulating soil Si availability. Our results imply that, in terms of enhancing Si availability, long‐term biochar application with abundant Si input is more effective than straw retention for improving soil fertility in subtropical and tropical regions with highly weathered soils. Highlights Effect of phytolith‐rich rice straw and its biochar on soil Si availability was studied. Biochar had greater efficiency in increasing plant‐available Si in soil than rice straw. Over the short term, Si dissolution from PhSi is insignificant with a typical single‐season straw return rate. Increased pH played a crucial role in regulating soil Si availability in a short‐term study.

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Section: Si Uptake By Ricementioning

confidence: 61%

Section: Discussionmentioning

confidence: 99%

Changes in soil silicon forms and availability as affected by rice straw and its biochar

Yao

Gao

et al. 2022

European J Soil Science

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“…Implementing agricultural practices that have positive impacts on soil–plant Si mobility (e.g. cereal‐legume intercropping, cover crops; no‐till farming; de Tombeur, Roux, et al, 2021 ; Li et al, 2020 ) might mitigate this negative feedback. Finally, our results suggest the existence of ‘good neighbours’ that facilitate Si uptake.…”

Section: Discussionmentioning

confidence: 99%

Nitrogen availability and plant–plant interactions drive leaf silicon concentration in wheat genotypes

et al. 2022

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1. Estimating plasticity of leaf silicon (Si) in response to abiotic and biotic factors underpins our comprehension of plant defences and stress resistance in natural and agroecosystems. However, how nitrogen (N) addition and intraspecific plant-plant interactions affect Si concentration remains unclear.2. We grew 19 durum wheat genotypes (Triticum turgidum ssp. durum) in pots, either alone or in intra-or intergenotypic cultures of two individuals, and with or without N. Above-ground biomass, plant height and leaf [Si] were quantified at the beginning of the flowering stage.3. Nitrogen addition decreased leaf [Si] for most genotypes, proportionally to the biomass increase. Si plasticity to plant-plant interactions varied significantly among genotypes, with both increases and decreases in leaf [Si] when mixed with a neighbour, regardless of the mixture type (intra-/intergenotype). Besides, increased leaf [Si] in response to plant-plant interactions was associated with increased plant height. 4. Our results suggest the occurrence of both facilitation and competition for Si uptake from the rhizosphere in wheat mixtures. Future research should identify which leaf and root traits characterise facilitating neighbours for Si acquisition.We also show that Si could be involved in height gain in response to intraspecific competition, possibly for increasing light capture. This important finding opens up new research directions on Si and plant-plant interactions in both natural ecosystems and agroecosystems. More generally, our results stress the need to explore leaf Si plasticity in responses to both abiotic and biotic factors to understand plant stress resistance.

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“…Other benefits include mobilization of P that is poorly available for most species for neighbors of the following crop [56,57] . Likewise, beneficial elements such as silicon may be mobilized by carboxylate-releasing species, to make these available for neighbors or subsequent crops to boost their defense [58,59] . Research to explore the various plant traits of species available for multispecies leys is needed to enable farmers to make informed decisions on what species combinations are desirable for the ecosystem services they seek to provide and under which conditions.…”

Section: Toward Sustainable Cropping Systems At the Regional Levelmentioning

confidence: 99%

Challenges Providing Multiple Ecosystem Benefits for Sustainable Managed Systems

2022

Front. Agr. Sci. Eng.

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Silicon dynamics through the lens of soil-plant-animal interactions: perspectives for agricultural practices

Cited by 27 publications

References 319 publications

Changes in soil silicon forms and availability as affected by rice straw and its biochar

Changes in soil silicon forms and availability as affected by rice straw and its biochar

Nitrogen availability and plant–plant interactions drive leaf silicon concentration in wheat genotypes

Challenges Providing Multiple Ecosystem Benefits for Sustainable Managed Systems

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