Humic Substances in Combination With Plant Growth-Promoting Bacteria as an Alternative for Sustainable Agriculture

Silva, Maura Santos Reis de Andrade da; Santos, Bianca de Melo Silveira dos; Silva, Camilla Santos Reis de Andrade da; Silva, Carolina Santos Reis de Andrade da; Antunes, Luiz Fernando de Sousa; Santos, Rodrigo Martins dos; Santos, Carlos Henrique Barbosa; Rigobelo, Everlon Cid

doi:10.3389/fmicb.2021.719653

Cited by 34 publications

(15 citation statements)

References 117 publications

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“…Reducing soil to such a matrix medium of course is a brute, but for greenhouses apparently feasible simplification (Figure a). For farmland with its alternating climate, water, and light conditions and based on the above quoted observation that sustained fertility goes strictly with soil carbon content, people can differentiate essentially three anthropogenic approaches: (i) addition of manure and waste biomasses, , (ii) biochar addition, and (iii) natural and artificial humic substances (Figure b).…”

Section: Soils In the Anthropocenementioning

confidence: 99%

Anthropogenic, Carbon-Reinforced Soil as a Living Engineered Material

Yang

Antonietti

2023

Chem. Rev.

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In recent years, the simple synthesis of artificial humic substances (A-HS) by alkaline hydrothermal processing of waste biomass was described. This A-HS was shown to support water and mineral binding, to change soil structure, to avoid fertilizer mineralization, and to support plant growth. Many of the observed macroscopic effects could, however, not be directly related to the minute amounts of A-HS which have been added, and an A-HS stimulated microbiome was found to be the key for understanding. In this review, we describe such anthropogenic soil in the language of the modern concept of living engineered materials and identify natural and artificial HS as the enabler to set up the interactive microbial system along the interfaces of the mineral grains. In that, old chemical concepts as surface activity, redox mediation, and pH buffering are the base of the system structure build-up and the complex self-adaptability of biological systems. The resulting chemical/biological hybrid system has the potential to address world problems as soil fertility, nutrition of a growing world population, and climate change. CONTENTS

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Section: Soils In the Anthropocenementioning

confidence: 99%

Anthropogenic, Carbon-Reinforced Soil as a Living Engineered Material

Yang

Antonietti

2023

Chem. Rev.

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“…HSs have been successfully used for increasing plant productivity in drought conditions [ 27 ]. Furthermore, a recent review recommends the combination of PGP bacteria with HSs as an alternative for sustainable agriculture [ 28 ]. However, it is emphasized in another review [ 28 ] that the number of reports describing the action of PGP bacteria in combination with HSs is extremely low in comparison with the great potential of this treatment option.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, a recent review recommends the combination of PGP bacteria with HSs as an alternative for sustainable agriculture [ 28 ]. However, it is emphasized in another review [ 28 ] that the number of reports describing the action of PGP bacteria in combination with HSs is extremely low in comparison with the great potential of this treatment option. We managed to find only one article showing a positive effect of the combination of PGP bacteria with HSs on plant growth in drought conditions [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

Effects on Pseudomonas plecoglossicida 2,4-D and Humic Substances on the Growth, Pigment Indices and Concentration of Hormones in Wheat Seedlings Grown under Water Deficit

et al. 2023

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The search for ways to increase plant productivity in drought conditions is of fundamental importance, since soil moisture deficiency is widespread and leads to critical crop losses. The aim of this study was to identify the effects of plant growth-promoting bacteria and humic substances on the growth, chlorophyll, flavonoids, nitrogen balance index, and concentration of cytokinins and abscisic acids in wheat plants grown in the laboratory under conditions of water deficit. An increase in the accumulation of plant mass was shown during the treatment of wheat plants with Pseudomonas plecoglossicida 2,4-D and humic substances in these conditions. It has been shown that stimulating plant growth is associated with increased root growth, which leads to an increase in the nitrogen balance index, chlorophyll, and flavonoid concentrations in treated plants. The detected increase in the concentration of chlorophyll in plants treated with P. plecoglossicida 2,4-D correlated with a decrease in the concentration of abscisic acid in plant shoots and, in plants treated with humates, with an increase in the concentration of cytokinins in shoots. The higher efficiency of treating plants with a combination of bacteria and humic substances than with any of them individually may be associated with the additive effect of these treatments on the hormonal balance.

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“…Furthermore, humic acids participate in the biological cycle of elements (carbon and nitrogen) [29], ion exchange, sorption processes, and soil detoxication processes, in addition to stimulating the growth and multiplication of endophytic microorganisms [13]. Other significant roles played by humic substances include their participation in carbon sequestration and greenhouse gas emissions [30], prevention of droughts, and the shaping of soil fertility [31].…”

Section: Introductionmentioning

confidence: 99%

Use of Organic Materials to Limit the Potential Negative Effect of Nitrogen on Maize in Different Soils

2022

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This study was launched to test organic materials in the form of humic acids (HA) applied to soil to improve the effect of nitrogen on maize, and to determine an optimal dose of HA, which will be ecologically safe and will counteract potential negative (phytotoxic) influences of excessive nitrogen fertiliser doses, on two soils with different textural composition. The maize plants grown on the loamy sand were characterised by a higher value of the SPAD leaf greenness index, yields, and a lower content of total-N and sulphate sulphur in maize. Urea, and especially UAN, promoted higher SPAD leaf greenness index values during the stem elongation stage and particularly during the tassel emergence stage. The effect of urea on maize yields was positive on both soils, but UAN had a positive effect on this parameter only on the loamy sand. HA tended to increase the SPAD leaf greenness index. The impact of HA on plant height and yields (especially medium dose) was generally positive. However, a negative effect of the interaction of HA with UAN on the plant height and maize yield on the sand was observed. HA caused an increase in the total-N content, and their highest dose also decreased the sulphate sulphur content in maize. The application of HA to soil has a positive influence on the growth and development of plants and can create positive effects by mitigating adverse consequences of intensive agricultural production in the natural environment.

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Humic Substances in Combination With Plant Growth-Promoting Bacteria as an Alternative for Sustainable Agriculture

Cited by 34 publications

References 117 publications

Anthropogenic, Carbon-Reinforced Soil as a Living Engineered Material

Anthropogenic, Carbon-Reinforced Soil as a Living Engineered Material

Effects on Pseudomonas plecoglossicida 2,4-D and Humic Substances on the Growth, Pigment Indices and Concentration of Hormones in Wheat Seedlings Grown under Water Deficit

Use of Organic Materials to Limit the Potential Negative Effect of Nitrogen on Maize in Different Soils

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